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prom_init.c

/*
 * Procedures for interfacing to Open Firmware.
 *
 * Paul Mackerras August 1996.
 * Copyright (C) 1996-2005 Paul Mackerras.
 * 
 *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
 *    {engebret|bergner}@us.ibm.com 
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#undef DEBUG_PROM

#include <stdarg.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/threads.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/stringify.h>
#include <linux/delay.h>
#include <linux/initrd.h>
#include <linux/bitops.h>
#include <asm/prom.h>
#include <asm/rtas.h>
#include <asm/page.h>
#include <asm/processor.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/system.h>
#include <asm/mmu.h>
#include <asm/pgtable.h>
#include <asm/pci.h>
#include <asm/iommu.h>
#include <asm/btext.h>
#include <asm/sections.h>
#include <asm/machdep.h>

#ifdef CONFIG_LOGO_LINUX_CLUT224
#include <linux/linux_logo.h>
extern const struct linux_logo logo_linux_clut224;
#endif

/*
 * Properties whose value is longer than this get excluded from our
 * copy of the device tree. This value does need to be big enough to
 * ensure that we don't lose things like the interrupt-map property
 * on a PCI-PCI bridge.
 */
#define MAX_PROPERTY_LENGTH   (1UL * 1024 * 1024)

/*
 * Eventually bump that one up
 */
#define DEVTREE_CHUNK_SIZE    0x100000

/*
 * This is the size of the local memory reserve map that gets copied
 * into the boot params passed to the kernel. That size is totally
 * flexible as the kernel just reads the list until it encounters an
 * entry with size 0, so it can be changed without breaking binary
 * compatibility
 */
#define MEM_RESERVE_MAP_SIZE  8

/*
 * prom_init() is called very early on, before the kernel text
 * and data have been mapped to KERNELBASE.  At this point the code
 * is running at whatever address it has been loaded at.
 * On ppc32 we compile with -mrelocatable, which means that references
 * to extern and static variables get relocated automatically.
 * On ppc64 we have to relocate the references explicitly with
 * RELOC.  (Note that strings count as static variables.)
 *
 * Because OF may have mapped I/O devices into the area starting at
 * KERNELBASE, particularly on CHRP machines, we can't safely call
 * OF once the kernel has been mapped to KERNELBASE.  Therefore all
 * OF calls must be done within prom_init().
 *
 * ADDR is used in calls to call_prom.  The 4th and following
 * arguments to call_prom should be 32-bit values.
 * On ppc64, 64 bit values are truncated to 32 bits (and
 * fortunately don't get interpreted as two arguments).
 */
#ifdef CONFIG_PPC64
#define RELOC(x)        (*PTRRELOC(&(x)))
#define ADDR(x)         (u32) add_reloc_offset((unsigned long)(x))
#define OF_WORKAROUNDS  0
#else
#define RELOC(x)  (x)
#define ADDR(x)         (u32) (x)
#define OF_WORKAROUNDS  of_workarounds
int of_workarounds;
#endif

#define OF_WA_CLAIM     1     /* do phys/virt claim separately, then map */
#define OF_WA_LONGTRAIL 2     /* work around longtrail bugs */

#define PROM_BUG() do {                               \
        prom_printf("kernel BUG at %s line 0x%x!\n",        \
                RELOC(__FILE__), __LINE__);                 \
        __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR);   \
} while (0)

#ifdef DEBUG_PROM
#define prom_debug(x...)      prom_printf(x)
#else
#define prom_debug(x...)
#endif


typedef u32 prom_arg_t;

struct prom_args {
        u32 service;
        u32 nargs;
        u32 nret;
        prom_arg_t args[10];
};

struct prom_t {
      ihandle root;
      phandle chosen;
      int cpu;
      ihandle stdout;
      ihandle mmumap;
      ihandle memory;
};

struct mem_map_entry {
      u64   base;
      u64   size;
};

typedef u32 cell_t;

extern void __start(unsigned long r3, unsigned long r4, unsigned long r5);

#ifdef CONFIG_PPC64
extern int enter_prom(struct prom_args *args, unsigned long entry);
#else
static inline int enter_prom(struct prom_args *args, unsigned long entry)
{
      return ((int (*)(struct prom_args *))entry)(args);
}
#endif

extern void copy_and_flush(unsigned long dest, unsigned long src,
                     unsigned long size, unsigned long offset);

/* prom structure */
static struct prom_t __initdata prom;

static unsigned long prom_entry __initdata;

#define PROM_SCRATCH_SIZE 256

static char __initdata of_stdout_device[256];
static char __initdata prom_scratch[PROM_SCRATCH_SIZE];

static unsigned long __initdata dt_header_start;
static unsigned long __initdata dt_struct_start, dt_struct_end;
static unsigned long __initdata dt_string_start, dt_string_end;

static unsigned long __initdata prom_initrd_start, prom_initrd_end;

#ifdef CONFIG_PPC64
static int __initdata prom_iommu_force_on;
static int __initdata prom_iommu_off;
static unsigned long __initdata prom_tce_alloc_start;
static unsigned long __initdata prom_tce_alloc_end;
#endif

/* Platforms codes are now obsolete in the kernel. Now only used within this
 * file and ultimately gone too. Feel free to change them if you need, they
 * are not shared with anything outside of this file anymore
 */
#define PLATFORM_PSERIES      0x0100
#define PLATFORM_PSERIES_LPAR 0x0101
#define PLATFORM_LPAR         0x0001
#define PLATFORM_POWERMAC     0x0400
#define PLATFORM_GENERIC      0x0500

static int __initdata of_platform;

static char __initdata prom_cmd_line[COMMAND_LINE_SIZE];

static unsigned long __initdata alloc_top;
static unsigned long __initdata alloc_top_high;
static unsigned long __initdata alloc_bottom;
static unsigned long __initdata rmo_top;
static unsigned long __initdata ram_top;

static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE];
static int __initdata mem_reserve_cnt;

static cell_t __initdata regbuf[1024];


/*
 * Error results ... some OF calls will return "-1" on error, some
 * will return 0, some will return either. To simplify, here are
 * macros to use with any ihandle or phandle return value to check if
 * it is valid
 */

#define PROM_ERROR            (-1u)
#define PHANDLE_VALID(p)      ((p) != 0 && (p) != PROM_ERROR)
#define IHANDLE_VALID(i)      ((i) != 0 && (i) != PROM_ERROR)


/* This is the one and *ONLY* place where we actually call open
 * firmware.
 */

static int __init call_prom(const char *service, int nargs, int nret, ...)
{
      int i;
      struct prom_args args;
      va_list list;

      args.service = ADDR(service);
      args.nargs = nargs;
      args.nret = nret;

      va_start(list, nret);
      for (i = 0; i < nargs; i++)
            args.args[i] = va_arg(list, prom_arg_t);
      va_end(list);

      for (i = 0; i < nret; i++)
            args.args[nargs+i] = 0;

      if (enter_prom(&args, RELOC(prom_entry)) < 0)
            return PROM_ERROR;

      return (nret > 0) ? args.args[nargs] : 0;
}

static int __init call_prom_ret(const char *service, int nargs, int nret,
                        prom_arg_t *rets, ...)
{
      int i;
      struct prom_args args;
      va_list list;

      args.service = ADDR(service);
      args.nargs = nargs;
      args.nret = nret;

      va_start(list, rets);
      for (i = 0; i < nargs; i++)
            args.args[i] = va_arg(list, prom_arg_t);
      va_end(list);

      for (i = 0; i < nret; i++)
            args.args[nargs+i] = 0;

      if (enter_prom(&args, RELOC(prom_entry)) < 0)
            return PROM_ERROR;

      if (rets != NULL)
            for (i = 1; i < nret; ++i)
                  rets[i-1] = args.args[nargs+i];

      return (nret > 0) ? args.args[nargs] : 0;
}


static void __init prom_print(const char *msg)
{
      const char *p, *q;
      struct prom_t *_prom = &RELOC(prom);

      if (_prom->stdout == 0)
            return;

      for (p = msg; *p != 0; p = q) {
            for (q = p; *q != 0 && *q != '\n'; ++q)
                  ;
            if (q > p)
                  call_prom("write", 3, 1, _prom->stdout, p, q - p);
            if (*q == 0)
                  break;
            ++q;
            call_prom("write", 3, 1, _prom->stdout, ADDR("\r\n"), 2);
      }
}


static void __init prom_print_hex(unsigned long val)
{
      int i, nibbles = sizeof(val)*2;
      char buf[sizeof(val)*2+1];
      struct prom_t *_prom = &RELOC(prom);

      for (i = nibbles-1;  i >= 0;  i--) {
            buf[i] = (val & 0xf) + '0';
            if (buf[i] > '9')
                  buf[i] += ('a'-'0'-10);
            val >>= 4;
      }
      buf[nibbles] = '\0';
      call_prom("write", 3, 1, _prom->stdout, buf, nibbles);
}


static void __init prom_printf(const char *format, ...)
{
      const char *p, *q, *s;
      va_list args;
      unsigned long v;
      struct prom_t *_prom = &RELOC(prom);

      va_start(args, format);
#ifdef CONFIG_PPC64
      format = PTRRELOC(format);
#endif
      for (p = format; *p != 0; p = q) {
            for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
                  ;
            if (q > p)
                  call_prom("write", 3, 1, _prom->stdout, p, q - p);
            if (*q == 0)
                  break;
            if (*q == '\n') {
                  ++q;
                  call_prom("write", 3, 1, _prom->stdout,
                          ADDR("\r\n"), 2);
                  continue;
            }
            ++q;
            if (*q == 0)
                  break;
            switch (*q) {
            case 's':
                  ++q;
                  s = va_arg(args, const char *);
                  prom_print(s);
                  break;
            case 'x':
                  ++q;
                  v = va_arg(args, unsigned long);
                  prom_print_hex(v);
                  break;
            }
      }
}


static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
                        unsigned long align)
{
      struct prom_t *_prom = &RELOC(prom);

      if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) {
            /*
             * Old OF requires we claim physical and virtual separately
             * and then map explicitly (assuming virtual mode)
             */
            int ret;
            prom_arg_t result;

            ret = call_prom_ret("call-method", 5, 2, &result,
                            ADDR("claim"), _prom->memory,
                            align, size, virt);
            if (ret != 0 || result == -1)
                  return -1;
            ret = call_prom_ret("call-method", 5, 2, &result,
                            ADDR("claim"), _prom->mmumap,
                            align, size, virt);
            if (ret != 0) {
                  call_prom("call-method", 4, 1, ADDR("release"),
                          _prom->memory, size, virt);
                  return -1;
            }
            /* the 0x12 is M (coherence) + PP == read/write */
            call_prom("call-method", 6, 1,
                    ADDR("map"), _prom->mmumap, 0x12, size, virt, virt);
            return virt;
      }
      return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
                   (prom_arg_t)align);
}

static void __init __attribute__((noreturn)) prom_panic(const char *reason)
{
#ifdef CONFIG_PPC64
      reason = PTRRELOC(reason);
#endif
      prom_print(reason);
      /* Do not call exit because it clears the screen on pmac
       * it also causes some sort of double-fault on early pmacs */
      if (RELOC(of_platform) == PLATFORM_POWERMAC)
            asm("trap\n");

      /* ToDo: should put up an SRC here on p/iSeries */
      call_prom("exit", 0, 0);

      for (;;)                /* should never get here */
            ;
}


static int __init prom_next_node(phandle *nodep)
{
      phandle node;

      if ((node = *nodep) != 0
          && (*nodep = call_prom("child", 1, 1, node)) != 0)
            return 1;
      if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
            return 1;
      for (;;) {
            if ((node = call_prom("parent", 1, 1, node)) == 0)
                  return 0;
            if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
                  return 1;
      }
}

static int inline prom_getprop(phandle node, const char *pname,
                         void *value, size_t valuelen)
{
      return call_prom("getprop", 4, 1, node, ADDR(pname),
                   (u32)(unsigned long) value, (u32) valuelen);
}

static int inline prom_getproplen(phandle node, const char *pname)
{
      return call_prom("getproplen", 2, 1, node, ADDR(pname));
}

static void add_string(char **str, const char *q)
{
      char *p = *str;

      while (*q)
            *p++ = *q++;
      *p++ = ' ';
      *str = p;
}

static char *tohex(unsigned int x)
{
      static char digits[] = "0123456789abcdef";
      static char result[9];
      int i;

      result[8] = 0;
      i = 8;
      do {
            --i;
            result[i] = digits[x & 0xf];
            x >>= 4;
      } while (x != 0 && i > 0);
      return &result[i];
}

static int __init prom_setprop(phandle node, const char *nodename,
                         const char *pname, void *value, size_t valuelen)
{
      char cmd[256], *p;

      if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL))
            return call_prom("setprop", 4, 1, node, ADDR(pname),
                         (u32)(unsigned long) value, (u32) valuelen);

      /* gah... setprop doesn't work on longtrail, have to use interpret */
      p = cmd;
      add_string(&p, "dev");
      add_string(&p, nodename);
      add_string(&p, tohex((u32)(unsigned long) value));
      add_string(&p, tohex(valuelen));
      add_string(&p, tohex(ADDR(pname)));
      add_string(&p, tohex(strlen(RELOC(pname))));
      add_string(&p, "property");
      *p = 0;
      return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
}

/* We can't use the standard versions because of RELOC headaches. */
#define isxdigit(c)     (('0' <= (c) && (c) <= '9') \
                   || ('a' <= (c) && (c) <= 'f') \
                   || ('A' <= (c) && (c) <= 'F'))

#define isdigit(c)      ('0' <= (c) && (c) <= '9')
#define islower(c)      ('a' <= (c) && (c) <= 'z')
#define toupper(c)      (islower(c) ? ((c) - 'a' + 'A') : (c))

unsigned long prom_strtoul(const char *cp, const char **endp)
{
      unsigned long result = 0, base = 10, value;

      if (*cp == '0') {
            base = 8;
            cp++;
            if (toupper(*cp) == 'X') {
                  cp++;
                  base = 16;
            }
      }

      while (isxdigit(*cp) &&
             (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) {
            result = result * base + value;
            cp++;
      }

      if (endp)
            *endp = cp;

      return result;
}

unsigned long prom_memparse(const char *ptr, const char **retptr)
{
      unsigned long ret = prom_strtoul(ptr, retptr);
      int shift = 0;

      /*
       * We can't use a switch here because GCC *may* generate a
       * jump table which won't work, because we're not running at
       * the address we're linked at.
       */
      if ('G' == **retptr || 'g' == **retptr)
            shift = 30;

      if ('M' == **retptr || 'm' == **retptr)
            shift = 20;

      if ('K' == **retptr || 'k' == **retptr)
            shift = 10;

      if (shift) {
            ret <<= shift;
            (*retptr)++;
      }

      return ret;
}

/*
 * Early parsing of the command line passed to the kernel, used for
 * "mem=x" and the options that affect the iommu
 */
static void __init early_cmdline_parse(void)
{
      struct prom_t *_prom = &RELOC(prom);
#ifdef CONFIG_PPC64
      const char *opt;
#endif
      char *p;
      int l = 0;

      RELOC(prom_cmd_line[0]) = 0;
      p = RELOC(prom_cmd_line);
      if ((long)_prom->chosen > 0)
            l = prom_getprop(_prom->chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
#ifdef CONFIG_CMDLINE
      if (l <= 0 || p[0] == '\0') /* dbl check */
            strlcpy(RELOC(prom_cmd_line),
                  RELOC(CONFIG_CMDLINE), sizeof(prom_cmd_line));
#endif /* CONFIG_CMDLINE */
      prom_printf("command line: %s\n", RELOC(prom_cmd_line));

#ifdef CONFIG_PPC64
      opt = strstr(RELOC(prom_cmd_line), RELOC("iommu="));
      if (opt) {
            prom_printf("iommu opt is: %s\n", opt);
            opt += 6;
            while (*opt && *opt == ' ')
                  opt++;
            if (!strncmp(opt, RELOC("off"), 3))
                  RELOC(prom_iommu_off) = 1;
            else if (!strncmp(opt, RELOC("force"), 5))
                  RELOC(prom_iommu_force_on) = 1;
      }
#endif
}

#ifdef CONFIG_PPC_PSERIES
/*
 * There are two methods for telling firmware what our capabilities are.
 * Newer machines have an "ibm,client-architecture-support" method on the
 * root node.  For older machines, we have to call the "process-elf-header"
 * method in the /packages/elf-loader node, passing it a fake 32-bit
 * ELF header containing a couple of PT_NOTE sections that contain
 * structures that contain various information.
 */

/*
 * New method - extensible architecture description vector.
 *
 * Because the description vector contains a mix of byte and word
 * values, we declare it as an unsigned char array, and use this
 * macro to put word values in.
 */
#define W(x)      ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \
            ((x) >> 8) & 0xff, (x) & 0xff

/* Option vector bits - generic bits in byte 1 */
#define OV_IGNORE       0x80  /* ignore this vector */
#define OV_CESSATION_POLICY   0x40  /* halt if unsupported option present*/

/* Option vector 1: processor architectures supported */
#define OV1_PPC_2_00          0x80  /* set if we support PowerPC 2.00 */
#define OV1_PPC_2_01          0x40  /* set if we support PowerPC 2.01 */
#define OV1_PPC_2_02          0x20  /* set if we support PowerPC 2.02 */
#define OV1_PPC_2_03          0x10  /* set if we support PowerPC 2.03 */
#define OV1_PPC_2_04          0x08  /* set if we support PowerPC 2.04 */
#define OV1_PPC_2_05          0x04  /* set if we support PowerPC 2.05 */
#define OV1_PPC_2_06          0x02  /* set if we support PowerPC 2.06 */

/* Option vector 2: Open Firmware options supported */
#define OV2_REAL_MODE         0x20  /* set if we want OF in real mode */

/* Option vector 3: processor options supported */
#define OV3_FP                0x80  /* floating point */
#define OV3_VMX               0x40  /* VMX/Altivec */
#define OV3_DFP               0x20  /* decimal FP */

/* Option vector 5: PAPR/OF options supported */
#define OV5_LPAR        0x80  /* logical partitioning supported */
#define OV5_SPLPAR            0x40  /* shared-processor LPAR supported */
/* ibm,dynamic-reconfiguration-memory property supported */
#define OV5_DRCONF_MEMORY     0x20
#define OV5_LARGE_PAGES       0x10  /* large pages supported */
#define OV5_DONATE_DEDICATE_CPU 0x02      /* donate dedicated CPU support */
/* PCIe/MSI support.  Without MSI full PCIe is not supported */
#ifdef CONFIG_PCI_MSI
#define OV5_MSI               0x01  /* PCIe/MSI support */
#else
#define OV5_MSI               0x00
#endif /* CONFIG_PCI_MSI */
#ifdef CONFIG_PPC_SMLPAR
#define OV5_CMO               0x80  /* Cooperative Memory Overcommitment */
#else
#define OV5_CMO               0x00
#endif

/*
 * The architecture vector has an array of PVR mask/value pairs,
 * followed by # option vectors - 1, followed by the option vectors.
 */
static unsigned char ibm_architecture_vec[] = {
      W(0xfffe0000), W(0x003a0000), /* POWER5/POWER5+ */
      W(0xffff0000), W(0x003e0000), /* POWER6 */
      W(0xffff0000), W(0x003f0000), /* POWER7 */
      W(0xffffffff), W(0x0f000003), /* all 2.06-compliant */
      W(0xffffffff), W(0x0f000002), /* all 2.05-compliant */
      W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */
      5 - 1,                        /* 5 option vectors */

      /* option vector 1: processor architectures supported */
      3 - 2,                        /* length */
      0,                      /* don't ignore, don't halt */
      OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
      OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06,

      /* option vector 2: Open Firmware options supported */
      34 - 2,                       /* length */
      OV2_REAL_MODE,
      0, 0,
      W(0xffffffff),                /* real_base */
      W(0xffffffff),                /* real_size */
      W(0xffffffff),                /* virt_base */
      W(0xffffffff),                /* virt_size */
      W(0xffffffff),                /* load_base */
      W(64),                        /* 128MB min RMA */
      W(0xffffffff),                /* full client load */
      0,                      /* min RMA percentage of total RAM */
      48,                     /* max log_2(hash table size) */

      /* option vector 3: processor options supported */
      3 - 2,                        /* length */
      0,                      /* don't ignore, don't halt */
      OV3_FP | OV3_VMX | OV3_DFP,

      /* option vector 4: IBM PAPR implementation */
      2 - 2,                        /* length */
      0,                      /* don't halt */

      /* option vector 5: PAPR/OF options */
      5 - 2,                        /* length */
      0,                      /* don't ignore, don't halt */
      OV5_LPAR | OV5_SPLPAR | OV5_LARGE_PAGES | OV5_DRCONF_MEMORY |
      OV5_DONATE_DEDICATE_CPU | OV5_MSI,
      0,
      OV5_CMO,
};

/* Old method - ELF header with PT_NOTE sections */
static struct fake_elf {
      Elf32_Ehdr  elfhdr;
      Elf32_Phdr  phdr[2];
      struct chrpnote {
            u32   namesz;
            u32   descsz;
            u32   type;
            char  name[8];    /* "PowerPC" */
            struct chrpdesc {
                  u32   real_mode;
                  u32   real_base;
                  u32   real_size;
                  u32   virt_base;
                  u32   virt_size;
                  u32   load_base;
            } chrpdesc;
      } chrpnote;
      struct rpanote {
            u32   namesz;
            u32   descsz;
            u32   type;
            char  name[24];   /* "IBM,RPA-Client-Config" */
            struct rpadesc {
                  u32   lpar_affinity;
                  u32   min_rmo_size;
                  u32   min_rmo_percent;
                  u32   max_pft_size;
                  u32   splpar;
                  u32   min_load;
                  u32   new_mem_def;
                  u32   ignore_me;
            } rpadesc;
      } rpanote;
} fake_elf = {
      .elfhdr = {
            .e_ident = { 0x7f, 'E', 'L', 'F',
                       ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
            .e_type = ET_EXEC,      /* yeah right */
            .e_machine = EM_PPC,
            .e_version = EV_CURRENT,
            .e_phoff = offsetof(struct fake_elf, phdr),
            .e_phentsize = sizeof(Elf32_Phdr),
            .e_phnum = 2
      },
      .phdr = {
            [0] = {
                  .p_type = PT_NOTE,
                  .p_offset = offsetof(struct fake_elf, chrpnote),
                  .p_filesz = sizeof(struct chrpnote)
            }, [1] = {
                  .p_type = PT_NOTE,
                  .p_offset = offsetof(struct fake_elf, rpanote),
                  .p_filesz = sizeof(struct rpanote)
            }
      },
      .chrpnote = {
            .namesz = sizeof("PowerPC"),
            .descsz = sizeof(struct chrpdesc),
            .type = 0x1275,
            .name = "PowerPC",
            .chrpdesc = {
                  .real_mode = ~0U, /* ~0 means "don't care" */
                  .real_base = ~0U,
                  .real_size = ~0U,
                  .virt_base = ~0U,
                  .virt_size = ~0U,
                  .load_base = ~0U
            },
      },
      .rpanote = {
            .namesz = sizeof("IBM,RPA-Client-Config"),
            .descsz = sizeof(struct rpadesc),
            .type = 0x12759999,
            .name = "IBM,RPA-Client-Config",
            .rpadesc = {
                  .lpar_affinity = 0,
                  .min_rmo_size = 64,     /* in megabytes */
                  .min_rmo_percent = 0,
                  .max_pft_size = 48,     /* 2^48 bytes max PFT size */
                  .splpar = 1,
                  .min_load = ~0U,
                  .new_mem_def = 0
            }
      }
};

static void __init prom_send_capabilities(void)
{
      ihandle elfloader, root;
      prom_arg_t ret;

      root = call_prom("open", 1, 1, ADDR("/"));
      if (root != 0) {
            /* try calling the ibm,client-architecture-support method */
            if (call_prom_ret("call-method", 3, 2, &ret,
                          ADDR("ibm,client-architecture-support"),
                          root,
                          ADDR(ibm_architecture_vec)) == 0) {
                  /* the call exists... */
                  if (ret)
                        prom_printf("WARNING: ibm,client-architecture"
                                  "-support call FAILED!\n");
                  call_prom("close", 1, 0, root);
                  return;
            }
            call_prom("close", 1, 0, root);
      }

      /* no ibm,client-architecture-support call, try the old way */
      elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
      if (elfloader == 0) {
            prom_printf("couldn't open /packages/elf-loader\n");
            return;
      }
      call_prom("call-method", 3, 1, ADDR("process-elf-header"),
                  elfloader, ADDR(&fake_elf));
      call_prom("close", 1, 0, elfloader);
}
#endif

/*
 * Memory allocation strategy... our layout is normally:
 *
 *  at 14Mb or more we have vmlinux, then a gap and initrd.  In some
 *  rare cases, initrd might end up being before the kernel though.
 *  We assume this won't override the final kernel at 0, we have no
 *  provision to handle that in this version, but it should hopefully
 *  never happen.
 *
 *  alloc_top is set to the top of RMO, eventually shrink down if the
 *  TCEs overlap
 *
 *  alloc_bottom is set to the top of kernel/initrd
 *
 *  from there, allocations are done this way : rtas is allocated
 *  topmost, and the device-tree is allocated from the bottom. We try
 *  to grow the device-tree allocation as we progress. If we can't,
 *  then we fail, we don't currently have a facility to restart
 *  elsewhere, but that shouldn't be necessary.
 *
 *  Note that calls to reserve_mem have to be done explicitly, memory
 *  allocated with either alloc_up or alloc_down isn't automatically
 *  reserved.
 */


/*
 * Allocates memory in the RMO upward from the kernel/initrd
 *
 * When align is 0, this is a special case, it means to allocate in place
 * at the current location of alloc_bottom or fail (that is basically
 * extending the previous allocation). Used for the device-tree flattening
 */
static unsigned long __init alloc_up(unsigned long size, unsigned long align)
{
      unsigned long base = RELOC(alloc_bottom);
      unsigned long addr = 0;

      if (align)
            base = _ALIGN_UP(base, align);
      prom_debug("alloc_up(%x, %x)\n", size, align);
      if (RELOC(ram_top) == 0)
            prom_panic("alloc_up() called with mem not initialized\n");

      if (align)
            base = _ALIGN_UP(RELOC(alloc_bottom), align);
      else
            base = RELOC(alloc_bottom);

      for(; (base + size) <= RELOC(alloc_top); 
          base = _ALIGN_UP(base + 0x100000, align)) {
            prom_debug("    trying: 0x%x\n\r", base);
            addr = (unsigned long)prom_claim(base, size, 0);
            if (addr != PROM_ERROR && addr != 0)
                  break;
            addr = 0;
            if (align == 0)
                  break;
      }
      if (addr == 0)
            return 0;
      RELOC(alloc_bottom) = addr;

      prom_debug(" -> %x\n", addr);
      prom_debug("  alloc_bottom : %x\n", RELOC(alloc_bottom));
      prom_debug("  alloc_top    : %x\n", RELOC(alloc_top));
      prom_debug("  alloc_top_hi : %x\n", RELOC(alloc_top_high));
      prom_debug("  rmo_top      : %x\n", RELOC(rmo_top));
      prom_debug("  ram_top      : %x\n", RELOC(ram_top));

      return addr;
}

/*
 * Allocates memory downward, either from top of RMO, or if highmem
 * is set, from the top of RAM.  Note that this one doesn't handle
 * failures.  It does claim memory if highmem is not set.
 */
static unsigned long __init alloc_down(unsigned long size, unsigned long align,
                               int highmem)
{
      unsigned long base, addr = 0;

      prom_debug("alloc_down(%x, %x, %s)\n", size, align,
               highmem ? RELOC("(high)") : RELOC("(low)"));
      if (RELOC(ram_top) == 0)
            prom_panic("alloc_down() called with mem not initialized\n");

      if (highmem) {
            /* Carve out storage for the TCE table. */
            addr = _ALIGN_DOWN(RELOC(alloc_top_high) - size, align);
            if (addr <= RELOC(alloc_bottom))
                  return 0;
            /* Will we bump into the RMO ? If yes, check out that we
             * didn't overlap existing allocations there, if we did,
             * we are dead, we must be the first in town !
             */
            if (addr < RELOC(rmo_top)) {
                  /* Good, we are first */
                  if (RELOC(alloc_top) == RELOC(rmo_top))
                        RELOC(alloc_top) = RELOC(rmo_top) = addr;
                  else
                        return 0;
            }
            RELOC(alloc_top_high) = addr;
            goto bail;
      }

      base = _ALIGN_DOWN(RELOC(alloc_top) - size, align);
      for (; base > RELOC(alloc_bottom);
           base = _ALIGN_DOWN(base - 0x100000, align))  {
            prom_debug("    trying: 0x%x\n\r", base);
            addr = (unsigned long)prom_claim(base, size, 0);
            if (addr != PROM_ERROR && addr != 0)
                  break;
            addr = 0;
      }
      if (addr == 0)
            return 0;
      RELOC(alloc_top) = addr;

 bail:
      prom_debug(" -> %x\n", addr);
      prom_debug("  alloc_bottom : %x\n", RELOC(alloc_bottom));
      prom_debug("  alloc_top    : %x\n", RELOC(alloc_top));
      prom_debug("  alloc_top_hi : %x\n", RELOC(alloc_top_high));
      prom_debug("  rmo_top      : %x\n", RELOC(rmo_top));
      prom_debug("  ram_top      : %x\n", RELOC(ram_top));

      return addr;
}

/*
 * Parse a "reg" cell
 */
static unsigned long __init prom_next_cell(int s, cell_t **cellp)
{
      cell_t *p = *cellp;
      unsigned long r = 0;

      /* Ignore more than 2 cells */
      while (s > sizeof(unsigned long) / 4) {
            p++;
            s--;
      }
      r = *p++;
#ifdef CONFIG_PPC64
      if (s > 1) {
            r <<= 32;
            r |= *(p++);
      }
#endif
      *cellp = p;
      return r;
}

/*
 * Very dumb function for adding to the memory reserve list, but
 * we don't need anything smarter at this point
 *
 * XXX Eventually check for collisions.  They should NEVER happen.
 * If problems seem to show up, it would be a good start to track
 * them down.
 */
static void __init reserve_mem(u64 base, u64 size)
{
      u64 top = base + size;
      unsigned long cnt = RELOC(mem_reserve_cnt);

      if (size == 0)
            return;

      /* We need to always keep one empty entry so that we
       * have our terminator with "size" set to 0 since we are
       * dumb and just copy this entire array to the boot params
       */
      base = _ALIGN_DOWN(base, PAGE_SIZE);
      top = _ALIGN_UP(top, PAGE_SIZE);
      size = top - base;

      if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
            prom_panic("Memory reserve map exhausted !\n");
      RELOC(mem_reserve_map)[cnt].base = base;
      RELOC(mem_reserve_map)[cnt].size = size;
      RELOC(mem_reserve_cnt) = cnt + 1;
}

/*
 * Initialize memory allocation mechanism, parse "memory" nodes and
 * obtain that way the top of memory and RMO to setup out local allocator
 */
static void __init prom_init_mem(void)
{
      phandle node;
      char *path, type[64];
      unsigned int plen;
      cell_t *p, *endp;
      struct prom_t *_prom = &RELOC(prom);
      u32 rac, rsc;

      /*
       * We iterate the memory nodes to find
       * 1) top of RMO (first node)
       * 2) top of memory
       */
      rac = 2;
      prom_getprop(_prom->root, "#address-cells", &rac, sizeof(rac));
      rsc = 1;
      prom_getprop(_prom->root, "#size-cells", &rsc, sizeof(rsc));
      prom_debug("root_addr_cells: %x\n", (unsigned long) rac);
      prom_debug("root_size_cells: %x\n", (unsigned long) rsc);

      prom_debug("scanning memory:\n");
      path = RELOC(prom_scratch);

      for (node = 0; prom_next_node(&node); ) {
            type[0] = 0;
            prom_getprop(node, "device_type", type, sizeof(type));

            if (type[0] == 0) {
                  /*
                   * CHRP Longtrail machines have no device_type
                   * on the memory node, so check the name instead...
                   */
                  prom_getprop(node, "name", type, sizeof(type));
            }
            if (strcmp(type, RELOC("memory")))
                  continue;

            plen = prom_getprop(node, "reg", RELOC(regbuf), sizeof(regbuf));
            if (plen > sizeof(regbuf)) {
                  prom_printf("memory node too large for buffer !\n");
                  plen = sizeof(regbuf);
            }
            p = RELOC(regbuf);
            endp = p + (plen / sizeof(cell_t));

#ifdef DEBUG_PROM
            memset(path, 0, PROM_SCRATCH_SIZE);
            call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
            prom_debug("  node %s :\n", path);
#endif /* DEBUG_PROM */

            while ((endp - p) >= (rac + rsc)) {
                  unsigned long base, size;

                  base = prom_next_cell(rac, &p);
                  size = prom_next_cell(rsc, &p);

                  if (size == 0)
                        continue;
                  prom_debug("    %x %x\n", base, size);
                  if (base == 0 && (RELOC(of_platform) & PLATFORM_LPAR))
                        RELOC(rmo_top) = size;
                  if ((base + size) > RELOC(ram_top))
                        RELOC(ram_top) = base + size;
            }
      }

      RELOC(alloc_bottom) = PAGE_ALIGN((unsigned long)&RELOC(_end) + 0x4000);

      /* Check if we have an initrd after the kernel, if we do move our bottom
       * point to after it
       */
      if (RELOC(prom_initrd_start)) {
            if (RELOC(prom_initrd_end) > RELOC(alloc_bottom))
                  RELOC(alloc_bottom) = PAGE_ALIGN(RELOC(prom_initrd_end));
      }

      /*
       * Setup our top alloc point, that is top of RMO or top of
       * segment 0 when running non-LPAR.
       * Some RS64 machines have buggy firmware where claims up at
       * 1GB fail.  Cap at 768MB as a workaround.
       * Since 768MB is plenty of room, and we need to cap to something
       * reasonable on 32-bit, cap at 768MB on all machines.
       */
      if (!RELOC(rmo_top))
            RELOC(rmo_top) = RELOC(ram_top);
      RELOC(rmo_top) = min(0x30000000ul, RELOC(rmo_top));
      RELOC(alloc_top) = RELOC(rmo_top);
      RELOC(alloc_top_high) = RELOC(ram_top);

      prom_printf("memory layout at init:\n");
      prom_printf("  alloc_bottom : %x\n", RELOC(alloc_bottom));
      prom_printf("  alloc_top    : %x\n", RELOC(alloc_top));
      prom_printf("  alloc_top_hi : %x\n", RELOC(alloc_top_high));
      prom_printf("  rmo_top      : %x\n", RELOC(rmo_top));
      prom_printf("  ram_top      : %x\n", RELOC(ram_top));
}


/*
 * Allocate room for and instantiate RTAS
 */
static void __init prom_instantiate_rtas(void)
{
      phandle rtas_node;
      ihandle rtas_inst;
      u32 base, entry = 0;
      u32 size = 0;

      prom_debug("prom_instantiate_rtas: start...\n");

      rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
      prom_debug("rtas_node: %x\n", rtas_node);
      if (!PHANDLE_VALID(rtas_node))
            return;

      prom_getprop(rtas_node, "rtas-size", &size, sizeof(size));
      if (size == 0)
            return;

      base = alloc_down(size, PAGE_SIZE, 0);
      if (base == 0) {
            prom_printf("RTAS allocation failed !\n");
            return;
      }

      rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
      if (!IHANDLE_VALID(rtas_inst)) {
            prom_printf("opening rtas package failed (%x)\n", rtas_inst);
            return;
      }

      prom_printf("instantiating rtas at 0x%x ...", base);

      if (call_prom_ret("call-method", 3, 2, &entry,
                    ADDR("instantiate-rtas"),
                    rtas_inst, base) != 0
          || entry == 0) {
            prom_printf(" failed\n");
            return;
      }
      prom_printf(" done\n");

      reserve_mem(base, size);

      prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
                 &base, sizeof(base));
      prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
                 &entry, sizeof(entry));

      prom_debug("rtas base     = 0x%x\n", base);
      prom_debug("rtas entry    = 0x%x\n", entry);
      prom_debug("rtas size     = 0x%x\n", (long)size);

      prom_debug("prom_instantiate_rtas: end...\n");
}

#ifdef CONFIG_PPC64
/*
 * Allocate room for and initialize TCE tables
 */
static void __init prom_initialize_tce_table(void)
{
      phandle node;
      ihandle phb_node;
      char compatible[64], type[64], model[64];
      char *path = RELOC(prom_scratch);
      u64 base, align;
      u32 minalign, minsize;
      u64 tce_entry, *tce_entryp;
      u64 local_alloc_top, local_alloc_bottom;
      u64 i;

      if (RELOC(prom_iommu_off))
            return;

      prom_debug("starting prom_initialize_tce_table\n");

      /* Cache current top of allocs so we reserve a single block */
      local_alloc_top = RELOC(alloc_top_high);
      local_alloc_bottom = local_alloc_top;

      /* Search all nodes looking for PHBs. */
      for (node = 0; prom_next_node(&node); ) {
            compatible[0] = 0;
            type[0] = 0;
            model[0] = 0;
            prom_getprop(node, "compatible",
                       compatible, sizeof(compatible));
            prom_getprop(node, "device_type", type, sizeof(type));
            prom_getprop(node, "model", model, sizeof(model));

            if ((type[0] == 0) || (strstr(type, RELOC("pci")) == NULL))
                  continue;

            /* Keep the old logic intact to avoid regression. */
            if (compatible[0] != 0) {
                  if ((strstr(compatible, RELOC("python")) == NULL) &&
                      (strstr(compatible, RELOC("Speedwagon")) == NULL) &&
                      (strstr(compatible, RELOC("Winnipeg")) == NULL))
                        continue;
            } else if (model[0] != 0) {
                  if ((strstr(model, RELOC("ython")) == NULL) &&
                      (strstr(model, RELOC("peedwagon")) == NULL) &&
                      (strstr(model, RELOC("innipeg")) == NULL))
                        continue;
            }

            if (prom_getprop(node, "tce-table-minalign", &minalign,
                         sizeof(minalign)) == PROM_ERROR)
                  minalign = 0;
            if (prom_getprop(node, "tce-table-minsize", &minsize,
                         sizeof(minsize)) == PROM_ERROR)
                  minsize = 4UL << 20;

            /*
             * Even though we read what OF wants, we just set the table
             * size to 4 MB.  This is enough to map 2GB of PCI DMA space.
             * By doing this, we avoid the pitfalls of trying to DMA to
             * MMIO space and the DMA alias hole.
             *
             * On POWER4, firmware sets the TCE region by assuming
             * each TCE table is 8MB. Using this memory for anything
             * else will impact performance, so we always allocate 8MB.
             * Anton
             */
            if (__is_processor(PV_POWER4) || __is_processor(PV_POWER4p))
                  minsize = 8UL << 20;
            else
                  minsize = 4UL << 20;

            /* Align to the greater of the align or size */
            align = max(minalign, minsize);
            base = alloc_down(minsize, align, 1);
            if (base == 0)
                  prom_panic("ERROR, cannot find space for TCE table.\n");
            if (base < local_alloc_bottom)
                  local_alloc_bottom = base;

            /* It seems OF doesn't null-terminate the path :-( */
            memset(path, 0, PROM_SCRATCH_SIZE);
            /* Call OF to setup the TCE hardware */
            if (call_prom("package-to-path", 3, 1, node,
                        path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
                  prom_printf("package-to-path failed\n");
            }

            /* Save away the TCE table attributes for later use. */
            prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
            prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));

            prom_debug("TCE table: %s\n", path);
            prom_debug("\tnode = 0x%x\n", node);
            prom_debug("\tbase = 0x%x\n", base);
            prom_debug("\tsize = 0x%x\n", minsize);

            /* Initialize the table to have a one-to-one mapping
             * over the allocated size.
             */
            tce_entryp = (unsigned long *)base;
            for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
                  tce_entry = (i << PAGE_SHIFT);
                  tce_entry |= 0x3;
                  *tce_entryp = tce_entry;
            }

            prom_printf("opening PHB %s", path);
            phb_node = call_prom("open", 1, 1, path);
            if (phb_node == 0)
                  prom_printf("... failed\n");
            else
                  prom_printf("... done\n");

            call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
                    phb_node, -1, minsize,
                    (u32) base, (u32) (base >> 32));
            call_prom("close", 1, 0, phb_node);
      }

      reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);

      /* These are only really needed if there is a memory limit in
       * effect, but we don't know so export them always. */
      RELOC(prom_tce_alloc_start) = local_alloc_bottom;
      RELOC(prom_tce_alloc_end) = local_alloc_top;

      /* Flag the first invalid entry */
      prom_debug("ending prom_initialize_tce_table\n");
}
#endif

/*
 * With CHRP SMP we need to use the OF to start the other processors.
 * We can't wait until smp_boot_cpus (the OF is trashed by then)
 * so we have to put the processors into a holding pattern controlled
 * by the kernel (not OF) before we destroy the OF.
 *
 * This uses a chunk of low memory, puts some holding pattern
 * code there and sends the other processors off to there until
 * smp_boot_cpus tells them to do something.  The holding pattern
 * checks that address until its cpu # is there, when it is that
 * cpu jumps to __secondary_start().  smp_boot_cpus() takes care
 * of setting those values.
 *
 * We also use physical address 0x4 here to tell when a cpu
 * is in its holding pattern code.
 *
 * -- Cort
 */
extern void __secondary_hold(void);
extern unsigned long __secondary_hold_spinloop;
extern unsigned long __secondary_hold_acknowledge;

/*
 * We want to reference the copy of __secondary_hold_* in the
 * 0 - 0x100 address range
 */
#define LOW_ADDR(x)     (((unsigned long) &(x)) & 0xff)

static void __init prom_hold_cpus(void)
{
      unsigned long i;
      unsigned int reg;
      phandle node;
      char type[64];
      struct prom_t *_prom = &RELOC(prom);
      unsigned long *spinloop
            = (void *) LOW_ADDR(__secondary_hold_spinloop);
      unsigned long *acknowledge
            = (void *) LOW_ADDR(__secondary_hold_acknowledge);
#ifdef CONFIG_PPC64
      /* __secondary_hold is actually a descriptor, not the text address */
      unsigned long secondary_hold
            = __pa(*PTRRELOC((unsigned long *)__secondary_hold));
#else
      unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
#endif

      prom_debug("prom_hold_cpus: start...\n");
      prom_debug("    1) spinloop       = 0x%x\n", (unsigned long)spinloop);
      prom_debug("    1) *spinloop      = 0x%x\n", *spinloop);
      prom_debug("    1) acknowledge    = 0x%x\n",
               (unsigned long)acknowledge);
      prom_debug("    1) *acknowledge   = 0x%x\n", *acknowledge);
      prom_debug("    1) secondary_hold = 0x%x\n", secondary_hold);

      /* Set the common spinloop variable, so all of the secondary cpus
       * will block when they are awakened from their OF spinloop.
       * This must occur for both SMP and non SMP kernels, since OF will
       * be trashed when we move the kernel.
       */
      *spinloop = 0;

      /* look for cpus */
      for (node = 0; prom_next_node(&node); ) {
            type[0] = 0;
            prom_getprop(node, "device_type", type, sizeof(type));
            if (strcmp(type, RELOC("cpu")) != 0)
                  continue;

            /* Skip non-configured cpus. */
            if (prom_getprop(node, "status", type, sizeof(type)) > 0)
                  if (strcmp(type, RELOC("okay")) != 0)
                        continue;

            reg = -1;
            prom_getprop(node, "reg", &reg, sizeof(reg));

            prom_debug("cpu hw idx   = 0x%x\n", reg);

            /* Init the acknowledge var which will be reset by
             * the secondary cpu when it awakens from its OF
             * spinloop.
             */
            *acknowledge = (unsigned long)-1;

            if (reg != _prom->cpu) {
                  /* Primary Thread of non-boot cpu */
                  prom_printf("starting cpu hw idx %x... ", reg);
                  call_prom("start-cpu", 3, 0, node,
                          secondary_hold, reg);

                  for (i = 0; (i < 100000000) && 
                       (*acknowledge == ((unsigned long)-1)); i++ )
                        mb();

                  if (*acknowledge == reg)
                        prom_printf("done\n");
                  else
                        prom_printf("failed: %x\n", *acknowledge);
            }
#ifdef CONFIG_SMP
            else
                  prom_printf("boot cpu hw idx %x\n", reg);
#endif /* CONFIG_SMP */
      }

      prom_debug("prom_hold_cpus: end...\n");
}


static void __init prom_init_client_services(unsigned long pp)
{
      struct prom_t *_prom = &RELOC(prom);

      /* Get a handle to the prom entry point before anything else */
      RELOC(prom_entry) = pp;

      /* get a handle for the stdout device */
      _prom->chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
      if (!PHANDLE_VALID(_prom->chosen))
            prom_panic("cannot find chosen"); /* msg won't be printed :( */

      /* get device tree root */
      _prom->root = call_prom("finddevice", 1, 1, ADDR("/"));
      if (!PHANDLE_VALID(_prom->root))
            prom_panic("cannot find device tree root"); /* msg won't be printed :( */

      _prom->mmumap = 0;
}

#ifdef CONFIG_PPC32
/*
 * For really old powermacs, we need to map things we claim.
 * For that, we need the ihandle of the mmu.
 * Also, on the longtrail, we need to work around other bugs.
 */
static void __init prom_find_mmu(void)
{
      struct prom_t *_prom = &RELOC(prom);
      phandle oprom;
      char version[64];

      oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
      if (!PHANDLE_VALID(oprom))
            return;
      if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
            return;
      version[sizeof(version) - 1] = 0;
      /* XXX might need to add other versions here */
      if (strcmp(version, "Open Firmware, 1.0.5") == 0)
            of_workarounds = OF_WA_CLAIM;
      else if (strncmp(version, "FirmWorks,3.", 12) == 0) {
            of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
            call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
      } else
            return;
      _prom->memory = call_prom("open", 1, 1, ADDR("/memory"));
      prom_getprop(_prom->chosen, "mmu", &_prom->mmumap,
                 sizeof(_prom->mmumap));
      if (!IHANDLE_VALID(_prom->memory) || !IHANDLE_VALID(_prom->mmumap))
            of_workarounds &= ~OF_WA_CLAIM;           /* hmmm */
}
#else
#define prom_find_mmu()
#endif

static void __init prom_init_stdout(void)
{
      struct prom_t *_prom = &RELOC(prom);
      char *path = RELOC(of_stdout_device);
      char type[16];
      u32 val;

      if (prom_getprop(_prom->chosen, "stdout", &val, sizeof(val)) <= 0)
            prom_panic("cannot find stdout");

      _prom->stdout = val;

      /* Get the full OF pathname of the stdout device */
      memset(path, 0, 256);
      call_prom("instance-to-path", 3, 1, _prom->stdout, path, 255);
      val = call_prom("instance-to-package", 1, 1, _prom->stdout);
      prom_setprop(_prom->chosen, "/chosen", "linux,stdout-package",
                 &val, sizeof(val));
      prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device));
      prom_setprop(_prom->chosen, "/chosen", "linux,stdout-path",
                 path, strlen(path) + 1);

      /* If it's a display, note it */
      memset(type, 0, sizeof(type));
      prom_getprop(val, "device_type", type, sizeof(type));
      if (strcmp(type, RELOC("display")) == 0)
            prom_setprop(val, path, "linux,boot-display", NULL, 0);
}

static void __init prom_close_stdin(void)
{
      struct prom_t *_prom = &RELOC(prom);
      ihandle val;

      if (prom_getprop(_prom->chosen, "stdin", &val, sizeof(val)) > 0)
            call_prom("close", 1, 0, val);
}

static int __init prom_find_machine_type(void)
{
      struct prom_t *_prom = &RELOC(prom);
      char compat[256];
      int len, i = 0;
#ifdef CONFIG_PPC64
      phandle rtas;
      int x;
#endif

      /* Look for a PowerMac */
      len = prom_getprop(_prom->root, "compatible",
                     compat, sizeof(compat)-1);
      if (len > 0) {
            compat[len] = 0;
            while (i < len) {
                  char *p = &compat[i];
                  int sl = strlen(p);
                  if (sl == 0)
                        break;
                  if (strstr(p, RELOC("Power Macintosh")) ||
                      strstr(p, RELOC("MacRISC")))
                        return PLATFORM_POWERMAC;
#ifdef CONFIG_PPC64
                  /* We must make sure we don't detect the IBM Cell
                   * blades as pSeries due to some firmware issues,
                   * so we do it here.
                   */
                  if (strstr(p, RELOC("IBM,CBEA")) ||
                      strstr(p, RELOC("IBM,CPBW-1.0")))
                        return PLATFORM_GENERIC;
#endif /* CONFIG_PPC64 */
                  i += sl + 1;
            }
      }
#ifdef CONFIG_PPC64
      /* If not a mac, try to figure out if it's an IBM pSeries or any other
       * PAPR compliant platform. We assume it is if :
       *  - /device_type is "chrp" (please, do NOT use that for future
       *    non-IBM designs !
       *  - it has /rtas
       */
      len = prom_getprop(_prom->root, "device_type",
                     compat, sizeof(compat)-1);
      if (len <= 0)
            return PLATFORM_GENERIC;
      if (strcmp(compat, RELOC("chrp")))
            return PLATFORM_GENERIC;

      /* Default to pSeries. We need to know if we are running LPAR */
      rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
      if (!PHANDLE_VALID(rtas))
            return PLATFORM_GENERIC;
      x = prom_getproplen(rtas, "ibm,hypertas-functions");
      if (x != PROM_ERROR) {
            prom_printf("Hypertas detected, assuming LPAR !\n");
            return PLATFORM_PSERIES_LPAR;
      }
      return PLATFORM_PSERIES;
#else
      return PLATFORM_GENERIC;
#endif
}

static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
{
      return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
}

/*
 * If we have a display that we don't know how to drive,
 * we will want to try to execute OF's open method for it
 * later.  However, OF will probably fall over if we do that
 * we've taken over the MMU.
 * So we check whether we will need to open the display,
 * and if so, open it now.
 */
static void __init prom_check_displays(void)
{
      char type[16], *path;
      phandle node;
      ihandle ih;
      int i;

      static unsigned char default_colors[] = {
            0x00, 0x00, 0x00,
            0x00, 0x00, 0xaa,
            0x00, 0xaa, 0x00,
            0x00, 0xaa, 0xaa,
            0xaa, 0x00, 0x00,
            0xaa, 0x00, 0xaa,
            0xaa, 0xaa, 0x00,
            0xaa, 0xaa, 0xaa,
            0x55, 0x55, 0x55,
            0x55, 0x55, 0xff,
            0x55, 0xff, 0x55,
            0x55, 0xff, 0xff,
            0xff, 0x55, 0x55,
            0xff, 0x55, 0xff,
            0xff, 0xff, 0x55,
            0xff, 0xff, 0xff
      };
      const unsigned char *clut;

      prom_printf("Looking for displays\n");
      for (node = 0; prom_next_node(&node); ) {
            memset(type, 0, sizeof(type));
            prom_getprop(node, "device_type", type, sizeof(type));
            if (strcmp(type, RELOC("display")) != 0)
                  continue;

            /* It seems OF doesn't null-terminate the path :-( */
            path = RELOC(prom_scratch);
            memset(path, 0, PROM_SCRATCH_SIZE);

            /*
             * leave some room at the end of the path for appending extra
             * arguments
             */
            if (call_prom("package-to-path", 3, 1, node, path,
                        PROM_SCRATCH_SIZE-10) == PROM_ERROR)
                  continue;
            prom_printf("found display   : %s, opening ... ", path);
            
            ih = call_prom("open", 1, 1, path);
            if (ih == 0) {
                  prom_printf("failed\n");
                  continue;
            }

            /* Success */
            prom_printf("done\n");
            prom_setprop(node, path, "linux,opened", NULL, 0);

            /* Setup a usable color table when the appropriate
             * method is available. Should update this to set-colors */
            clut = RELOC(default_colors);
            for (i = 0; i < 32; i++, clut += 3)
                  if (prom_set_color(ih, i, clut[0], clut[1],
                                 clut[2]) != 0)
                        break;

#ifdef CONFIG_LOGO_LINUX_CLUT224
            clut = PTRRELOC(RELOC(logo_linux_clut224.clut));
            for (i = 0; i < RELOC(logo_linux_clut224.clutsize); i++, clut += 3)
                  if (prom_set_color(ih, i + 32, clut[0], clut[1],
                                 clut[2]) != 0)
                        break;
#endif /* CONFIG_LOGO_LINUX_CLUT224 */
      }
}


/* Return (relocated) pointer to this much memory: moves initrd if reqd. */
static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
                        unsigned long needed, unsigned long align)
{
      void *ret;

      *mem_start = _ALIGN(*mem_start, align);
      while ((*mem_start + needed) > *mem_end) {
            unsigned long room, chunk;

            prom_debug("Chunk exhausted, claiming more at %x...\n",
                     RELOC(alloc_bottom));
            room = RELOC(alloc_top) - RELOC(alloc_bottom);
            if (room > DEVTREE_CHUNK_SIZE)
                  room = DEVTREE_CHUNK_SIZE;
            if (room < PAGE_SIZE)
                  prom_panic("No memory for flatten_device_tree (no room)");
            chunk = alloc_up(room, 0);
            if (chunk == 0)
                  prom_panic("No memory for flatten_device_tree (claim failed)");
            *mem_end = RELOC(alloc_top);
      }

      ret = (void *)*mem_start;
      *mem_start += needed;

      return ret;
}

#define dt_push_token(token, mem_start, mem_end) \
      do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0)

static unsigned long __init dt_find_string(char *str)
{
      char *s, *os;

      s = os = (char *)RELOC(dt_string_start);
      s += 4;
      while (s <  (char *)RELOC(dt_string_end)) {
            if (strcmp(s, str) == 0)
                  return s - os;
            s += strlen(s) + 1;
      }
      return 0;
}

/*
 * The Open Firmware 1275 specification states properties must be 31 bytes or
 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
 */
#define MAX_PROPERTY_NAME 64

static void __init scan_dt_build_strings(phandle node,
                               unsigned long *mem_start,
                               unsigned long *mem_end)
{
      char *prev_name, *namep, *sstart;
      unsigned long soff;
      phandle child;

      sstart =  (char *)RELOC(dt_string_start);

      /* get and store all property names */
      prev_name = RELOC("");
      for (;;) {
            /* 64 is max len of name including nul. */
            namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
            if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
                  /* No more nodes: unwind alloc */
                  *mem_start = (unsigned long)namep;
                  break;
            }

            /* skip "name" */
            if (strcmp(namep, RELOC("name")) == 0) {
                  *mem_start = (unsigned long)namep;
                  prev_name = RELOC("name");
                  continue;
            }
            /* get/create string entry */
            soff = dt_find_string(namep);
            if (soff != 0) {
                  *mem_start = (unsigned long)namep;
                  namep = sstart + soff;
            } else {
                  /* Trim off some if we can */
                  *mem_start = (unsigned long)namep + strlen(namep) + 1;
                  RELOC(dt_string_end) = *mem_start;
            }
            prev_name = namep;
      }

      /* do all our children */
      child = call_prom("child", 1, 1, node);
      while (child != 0) {
            scan_dt_build_strings(child, mem_start, mem_end);
            child = call_prom("peer", 1, 1, child);
      }
}

static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
                              unsigned long *mem_end)
{
      phandle child;
      char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
      unsigned long soff;
      unsigned char *valp;
      static char pname[MAX_PROPERTY_NAME];
      int l, room;

      dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);

      /* get the node's full name */
      namep = (char *)*mem_start;
      room = *mem_end - *mem_start;
      if (room > 255)
            room = 255;
      l = call_prom("package-to-path", 3, 1, node, namep, room);
      if (l >= 0) {
            /* Didn't fit?  Get more room. */
            if (l >= room) {
                  if (l >= *mem_end - *mem_start)
                        namep = make_room(mem_start, mem_end, l+1, 1);
                  call_prom("package-to-path", 3, 1, node, namep, l);
            }
            namep[l] = '\0';

            /* Fixup an Apple bug where they have bogus \0 chars in the
             * middle of the path in some properties, and extract
             * the unit name (everything after the last '/').
             */
            for (lp = p = namep, ep = namep + l; p < ep; p++) {
                  if (*p == '/')
                        lp = namep;
                  else if (*p != 0)
                        *lp++ = *p;
            }
            *lp = 0;
            *mem_start = _ALIGN((unsigned long)lp + 1, 4);
      }

      /* get it again for debugging */
      path = RELOC(prom_scratch);
      memset(path, 0, PROM_SCRATCH_SIZE);
      call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);

      /* get and store all properties */
      prev_name = RELOC("");
      sstart = (char *)RELOC(dt_string_start);
      for (;;) {
            if (call_prom("nextprop", 3, 1, node, prev_name,
                        RELOC(pname)) != 1)
                  break;

            /* skip "name" */
            if (strcmp(RELOC(pname), RELOC("name")) == 0) {
                  prev_name = RELOC("name");
                  continue;
            }

            /* find string offset */
            soff = dt_find_string(RELOC(pname));
            if (soff == 0) {
                  prom_printf("WARNING: Can't find string index for"
                            " <%s>, node %s\n", RELOC(pname), path);
                  break;
            }
            prev_name = sstart + soff;

            /* get length */
            l = call_prom("getproplen", 2, 1, node, RELOC(pname));

            /* sanity checks */
            if (l == PROM_ERROR)
                  continue;
            if (l > MAX_PROPERTY_LENGTH) {
                  prom_printf("WARNING: ignoring large property ");
                  /* It seems OF doesn't null-terminate the path :-( */
                  prom_printf("[%s] ", path);
                  prom_printf("%s length 0x%x\n", RELOC(pname), l);
                  continue;
            }

            /* push property head */
            dt_push_token(OF_DT_PROP, mem_start, mem_end);
            dt_push_token(l, mem_start, mem_end);
            dt_push_token(soff, mem_start, mem_end);

            /* push property content */
            valp = make_room(mem_start, mem_end, l, 4);
            call_prom("getprop", 4, 1, node, RELOC(pname), valp, l);
            *mem_start = _ALIGN(*mem_start, 4);
      }

      /* Add a "linux,phandle" property. */
      soff = dt_find_string(RELOC("linux,phandle"));
      if (soff == 0)
            prom_printf("WARNING: Can't find string index for"
                      " <linux-phandle> node %s\n", path);
      else {
            dt_push_token(OF_DT_PROP, mem_start, mem_end);
            dt_push_token(4, mem_start, mem_end);
            dt_push_token(soff, mem_start, mem_end);
            valp = make_room(mem_start, mem_end, 4, 4);
            *(u32 *)valp = node;
      }

      /* do all our children */
      child = call_prom("child", 1, 1, node);
      while (child != 0) {
            scan_dt_build_struct(child, mem_start, mem_end);
            child = call_prom("peer", 1, 1, child);
      }

      dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
}

static void __init flatten_device_tree(void)
{
      phandle root;
      unsigned long mem_start, mem_end, room;
      struct boot_param_header *hdr;
      struct prom_t *_prom = &RELOC(prom);
      char *namep;
      u64 *rsvmap;

      /*
       * Check how much room we have between alloc top & bottom (+/- a
       * few pages), crop to 4Mb, as this is our "chuck" size
       */
      room = RELOC(alloc_top) - RELOC(alloc_bottom) - 0x4000;
      if (room > DEVTREE_CHUNK_SIZE)
            room = DEVTREE_CHUNK_SIZE;
      prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom));

      /* Now try to claim that */
      mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
      if (mem_start == 0)
            prom_panic("Can't allocate initial device-tree chunk\n");
      mem_end = RELOC(alloc_top);

      /* Get root of tree */
      root = call_prom("peer", 1, 1, (phandle)0);
      if (root == (phandle)0)
            prom_panic ("couldn't get device tree root\n");

      /* Build header and make room for mem rsv map */ 
      mem_start = _ALIGN(mem_start, 4);
      hdr = make_room(&mem_start, &mem_end,
                  sizeof(struct boot_param_header), 4);
      RELOC(dt_header_start) = (unsigned long)hdr;
      rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);

      /* Start of strings */
      mem_start = PAGE_ALIGN(mem_start);
      RELOC(dt_string_start) = mem_start;
      mem_start += 4; /* hole */

      /* Add "linux,phandle" in there, we'll need it */
      namep = make_room(&mem_start, &mem_end, 16, 1);
      strcpy(namep, RELOC("linux,phandle"));
      mem_start = (unsigned long)namep + strlen(namep) + 1;

      /* Build string array */
      prom_printf("Building dt strings...\n"); 
      scan_dt_build_strings(root, &mem_start, &mem_end);
      RELOC(dt_string_end) = mem_start;

      /* Build structure */
      mem_start = PAGE_ALIGN(mem_start);
      RELOC(dt_struct_start) = mem_start;
      prom_printf("Building dt structure...\n"); 
      scan_dt_build_struct(root, &mem_start, &mem_end);
      dt_push_token(OF_DT_END, &mem_start, &mem_end);
      RELOC(dt_struct_end) = PAGE_ALIGN(mem_start);

      /* Finish header */
      hdr->boot_cpuid_phys = _prom->cpu;
      hdr->magic = OF_DT_HEADER;
      hdr->totalsize = RELOC(dt_struct_end) - RELOC(dt_header_start);
      hdr->off_dt_struct = RELOC(dt_struct_start) - RELOC(dt_header_start);
      hdr->off_dt_strings = RELOC(dt_string_start) - RELOC(dt_header_start);
      hdr->dt_strings_size = RELOC(dt_string_end) - RELOC(dt_string_start);
      hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - RELOC(dt_header_start);
      hdr->version = OF_DT_VERSION;
      /* Version 16 is not backward compatible */
      hdr->last_comp_version = 0x10;

      /* Copy the reserve map in */
      memcpy(rsvmap, RELOC(mem_reserve_map), sizeof(mem_reserve_map));

#ifdef DEBUG_PROM
      {
            int i;
            prom_printf("reserved memory map:\n");
            for (i = 0; i < RELOC(mem_reserve_cnt); i++)
                  prom_printf("  %x - %x\n",
                            RELOC(mem_reserve_map)[i].base,
                            RELOC(mem_reserve_map)[i].size);
      }
#endif
      /* Bump mem_reserve_cnt to cause further reservations to fail
       * since it's too late.
       */
      RELOC(mem_reserve_cnt) = MEM_RESERVE_MAP_SIZE;

      prom_printf("Device tree strings 0x%x -> 0x%x\n",
                RELOC(dt_string_start), RELOC(dt_string_end)); 
      prom_printf("Device tree struct  0x%x -> 0x%x\n",
                RELOC(dt_struct_start), RELOC(dt_struct_end));

}

#ifdef CONFIG_PPC_MAPLE
/* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
 * The values are bad, and it doesn't even have the right number of cells. */
static void __init fixup_device_tree_maple(void)
{
      phandle isa;
      u32 rloc = 0x01002000; /* IO space; PCI device = 4 */
      u32 isa_ranges[6];
      char *name;

      name = "/ht@0/isa@4";
      isa = call_prom("finddevice", 1, 1, ADDR(name));
      if (!PHANDLE_VALID(isa)) {
            name = "/ht@0/isa@6";
            isa = call_prom("finddevice", 1, 1, ADDR(name));
            rloc = 0x01003000; /* IO space; PCI device = 6 */
      }
      if (!PHANDLE_VALID(isa))
            return;

      if (prom_getproplen(isa, "ranges") != 12)
            return;
      if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
            == PROM_ERROR)
            return;

      if (isa_ranges[0] != 0x1 ||
            isa_ranges[1] != 0xf4000000 ||
            isa_ranges[2] != 0x00010000)
            return;

      prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");

      isa_ranges[0] = 0x1;
      isa_ranges[1] = 0x0;
      isa_ranges[2] = rloc;
      isa_ranges[3] = 0x0;
      isa_ranges[4] = 0x0;
      isa_ranges[5] = 0x00010000;
      prom_setprop(isa, name, "ranges",
                  isa_ranges, sizeof(isa_ranges));
}
#else
#define fixup_device_tree_maple()
#endif

#ifdef CONFIG_PPC_CHRP
/*
 * Pegasos and BriQ lacks the "ranges" property in the isa node
 * Pegasos needs decimal IRQ 14/15, not hexadecimal
 * Pegasos has the IDE configured in legacy mode, but advertised as native
 */
static void __init fixup_device_tree_chrp(void)
{
      phandle ph;
      u32 prop[6];
      u32 rloc = 0x01006000; /* IO space; PCI device = 12 */
      char *name;
      int rc;

      name = "/pci@80000000/isa@c";
      ph = call_prom("finddevice", 1, 1, ADDR(name));
      if (!PHANDLE_VALID(ph)) {
            name = "/pci@ff500000/isa@6";
            ph = call_prom("finddevice", 1, 1, ADDR(name));
            rloc = 0x01003000; /* IO space; PCI device = 6 */
      }
      if (PHANDLE_VALID(ph)) {
            rc = prom_getproplen(ph, "ranges");
            if (rc == 0 || rc == PROM_ERROR) {
                  prom_printf("Fixing up missing ISA range on Pegasos...\n");

                  prop[0] = 0x1;
                  prop[1] = 0x0;
                  prop[2] = rloc;
                  prop[3] = 0x0;
                  prop[4] = 0x0;
                  prop[5] = 0x00010000;
                  prom_setprop(ph, name, "ranges", prop, sizeof(prop));
            }
      }

      name = "/pci@80000000/ide@C,1";
      ph = call_prom("finddevice", 1, 1, ADDR(name));
      if (PHANDLE_VALID(ph)) {
            prom_printf("Fixing up IDE interrupt on Pegasos...\n");
            prop[0] = 14;
            prop[1] = 0x0;
            prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32));
            prom_printf("Fixing up IDE class-code on Pegasos...\n");
            rc = prom_getprop(ph, "class-code", prop, sizeof(u32));
            if (rc == sizeof(u32)) {
                  prop[0] &= ~0x5;
                  prom_setprop(ph, name, "class-code", prop, sizeof(u32));
            }
      }
}
#else
#define fixup_device_tree_chrp()
#endif

#if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
static void __init fixup_device_tree_pmac(void)
{
      phandle u3, i2c, mpic;
      u32 u3_rev;
      u32 interrupts[2];
      u32 parent;

      /* Some G5s have a missing interrupt definition, fix it up here */
      u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
      if (!PHANDLE_VALID(u3))
            return;
      i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
      if (!PHANDLE_VALID(i2c))
            return;
      mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
      if (!PHANDLE_VALID(mpic))
            return;

      /* check if proper rev of u3 */
      if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
          == PROM_ERROR)
            return;
      if (u3_rev < 0x35 || u3_rev > 0x39)
            return;
      /* does it need fixup ? */
      if (prom_getproplen(i2c, "interrupts") > 0)
            return;

      prom_printf("fixing up bogus interrupts for u3 i2c...\n");

      /* interrupt on this revision of u3 is number 0 and level */
      interrupts[0] = 0;
      interrupts[1] = 1;
      prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
                 &interrupts, sizeof(interrupts));
      parent = (u32)mpic;
      prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
                 &parent, sizeof(parent));
}
#else
#define fixup_device_tree_pmac()
#endif

#ifdef CONFIG_PPC_EFIKA
/*
 * The MPC5200 FEC driver requires an phy-handle property to tell it how
 * to talk to the phy.  If the phy-handle property is missing, then this
 * function is called to add the appropriate nodes and link it to the
 * ethernet node.
 */
static void __init fixup_device_tree_efika_add_phy(void)
{
      u32 node;
      char prop[64];
      int rv;

      /* Check if /builtin/ethernet exists - bail if it doesn't */
      node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet"));
      if (!PHANDLE_VALID(node))
            return;

      /* Check if the phy-handle property exists - bail if it does */
      rv = prom_getprop(node, "phy-handle", prop, sizeof(prop));
      if (!rv)
            return;

      /*
       * At this point the ethernet device doesn't have a phy described.
       * Now we need to add the missing phy node and linkage
       */

      /* Check for an MDIO bus node - if missing then create one */
      node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio"));
      if (!PHANDLE_VALID(node)) {
            prom_printf("Adding Ethernet MDIO node\n");
            call_prom("interpret", 1, 1,
                  " s\" /builtin\" find-device"
                  " new-device"
                        " 1 encode-int s\" #address-cells\" property"
                        " 0 encode-int s\" #size-cells\" property"
                        " s\" mdio\" device-name"
                        " s\" fsl,mpc5200b-mdio\" encode-string"
                        " s\" compatible\" property"
                        " 0xf0003000 0x400 reg"
                        " 0x2 encode-int"
                        " 0x5 encode-int encode+"
                        " 0x3 encode-int encode+"
                        " s\" interrupts\" property"
                  " finish-device");
      };

      /* Check for a PHY device node - if missing then create one and
       * give it's phandle to the ethernet node */
      node = call_prom("finddevice", 1, 1,
                   ADDR("/builtin/mdio/ethernet-phy"));
      if (!PHANDLE_VALID(node)) {
            prom_printf("Adding Ethernet PHY node\n");
            call_prom("interpret", 1, 1,
                  " s\" /builtin/mdio\" find-device"
                  " new-device"
                        " s\" ethernet-phy\" device-name"
                        " 0x10 encode-int s\" reg\" property"
                        " my-self"
                        " ihandle>phandle"
                  " finish-device"
                  " s\" /builtin/ethernet\" find-device"
                        " encode-int"
                        " s\" phy-handle\" property"
                  " device-end");
      }
}

static void __init fixup_device_tree_efika(void)
{
      int sound_irq[3] = { 2, 2, 0 };
      int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0,
                        3,4,0, 3,5,0, 3,6,0, 3,7,0,
                        3,8,0, 3,9,0, 3,10,0, 3,11,0,
                        3,12,0, 3,13,0, 3,14,0, 3,15,0 };
      u32 node;
      char prop[64];
      int rv, len;

      /* Check if we're really running on a EFIKA */
      node = call_prom("finddevice", 1, 1, ADDR("/"));
      if (!PHANDLE_VALID(node))
            return;

      rv = prom_getprop(node, "model", prop, sizeof(prop));
      if (rv == PROM_ERROR)
            return;
      if (strcmp(prop, "EFIKA5K2"))
            return;

      prom_printf("Applying EFIKA device tree fixups\n");

      /* Claiming to be 'chrp' is death */
      node = call_prom("finddevice", 1, 1, ADDR("/"));
      rv = prom_getprop(node, "device_type", prop, sizeof(prop));
      if (rv != PROM_ERROR && (strcmp(prop, "chrp") == 0))
            prom_setprop(node, "/", "device_type", "efika", sizeof("efika"));

      /* CODEGEN,description is exposed in /proc/cpuinfo so
         fix that too */
      rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop));
      if (rv != PROM_ERROR && (strstr(prop, "CHRP")))
            prom_setprop(node, "/", "CODEGEN,description",
                       "Efika 5200B PowerPC System",
                       sizeof("Efika 5200B PowerPC System"));

      /* Fixup bestcomm interrupts property */
      node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm"));
      if (PHANDLE_VALID(node)) {
            len = prom_getproplen(node, "interrupts");
            if (len == 12) {
                  prom_printf("Fixing bestcomm interrupts property\n");
                  prom_setprop(node, "/builtin/bestcom", "interrupts",
                             bcomm_irq, sizeof(bcomm_irq));
            }
      }

      /* Fixup sound interrupts property */
      node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound"));
      if (PHANDLE_VALID(node)) {
            rv = prom_getprop(node, "interrupts", prop, sizeof(prop));
            if (rv == PROM_ERROR) {
                  prom_printf("Adding sound interrupts property\n");
                  prom_setprop(node, "/builtin/sound", "interrupts",
                             sound_irq, sizeof(sound_irq));
            }
      }

      /* Make sure ethernet phy-handle property exists */
      fixup_device_tree_efika_add_phy();
}
#else
#define fixup_device_tree_efika()
#endif

static void __init fixup_device_tree(void)
{
      fixup_device_tree_maple();
      fixup_device_tree_chrp();
      fixup_device_tree_pmac();
      fixup_device_tree_efika();
}

static void __init prom_find_boot_cpu(void)
{
      struct prom_t *_prom = &RELOC(prom);
      u32 getprop_rval;
      ihandle prom_cpu;
      phandle cpu_pkg;

      _prom->cpu = 0;
      if (prom_getprop(_prom->chosen, "cpu", &prom_cpu, sizeof(prom_cpu)) <= 0)
            return;

      cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);

      prom_getprop(cpu_pkg, "reg", &getprop_rval, sizeof(getprop_rval));
      _prom->cpu = getprop_rval;

      prom_debug("Booting CPU hw index = 0x%x\n", _prom->cpu);
}

static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
{
#ifdef CONFIG_BLK_DEV_INITRD
      struct prom_t *_prom = &RELOC(prom);

      if (r3 && r4 && r4 != 0xdeadbeef) {
            unsigned long val;

            RELOC(prom_initrd_start) = is_kernel_addr(r3) ? __pa(r3) : r3;
            RELOC(prom_initrd_end) = RELOC(prom_initrd_start) + r4;

            val = RELOC(prom_initrd_start);
            prom_setprop(_prom->chosen, "/chosen", "linux,initrd-start",
                       &val, sizeof(val));
            val = RELOC(prom_initrd_end);
            prom_setprop(_prom->chosen, "/chosen", "linux,initrd-end",
                       &val, sizeof(val));

            reserve_mem(RELOC(prom_initrd_start),
                      RELOC(prom_initrd_end) - RELOC(prom_initrd_start));

            prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start));
            prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end));
      }
#endif /* CONFIG_BLK_DEV_INITRD */
}

/*
 * We enter here early on, when the Open Firmware prom is still
 * handling exceptions and the MMU hash table for us.
 */

unsigned long __init prom_init(unsigned long r3, unsigned long r4,
                         unsigned long pp,
                         unsigned long r6, unsigned long r7)
{     
      struct prom_t *_prom;
      unsigned long hdr;
      unsigned long offset = reloc_offset();

#ifdef CONFIG_PPC32
      reloc_got2(offset);
#endif

      _prom = &RELOC(prom);

      /*
       * First zero the BSS
       */
      memset(&RELOC(__bss_start), 0, __bss_stop - __bss_start);

      /*
       * Init interface to Open Firmware, get some node references,
       * like /chosen
       */
      prom_init_client_services(pp);

      /*
       * See if this OF is old enough that we need to do explicit maps
       * and other workarounds
       */
      prom_find_mmu();

      /*
       * Init prom stdout device
       */
      prom_init_stdout();

      /*
       * Get default machine type. At this point, we do not differentiate
       * between pSeries SMP and pSeries LPAR
       */
      RELOC(of_platform) = prom_find_machine_type();

      /* Bail if this is a kdump kernel. */
      if (PHYSICAL_START > 0)
            prom_panic("Error: You can't boot a kdump kernel from OF!\n");

      /*
       * Check for an initrd
       */
      prom_check_initrd(r3, r4);

#ifdef CONFIG_PPC_PSERIES
      /*
       * On pSeries, inform the firmware about our capabilities
       */
      if (RELOC(of_platform) == PLATFORM_PSERIES ||
          RELOC(of_platform) == PLATFORM_PSERIES_LPAR)
            prom_send_capabilities();
#endif

      /*
       * Copy the CPU hold code
       */
      if (RELOC(of_platform) != PLATFORM_POWERMAC)
            copy_and_flush(0, KERNELBASE + offset, 0x100, 0);

      /*
       * Do early parsing of command line
       */
      early_cmdline_parse();

      /*
       * Initialize memory management within prom_init
       */
      prom_init_mem();

      /*
       * Determine which cpu is actually running right _now_
       */
      prom_find_boot_cpu();

      /* 
       * Initialize display devices
       */
      prom_check_displays();

#ifdef CONFIG_PPC64
      /*
       * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
       * that uses the allocator, we need to make sure we get the top of memory
       * available for us here...
       */
      if (RELOC(of_platform) == PLATFORM_PSERIES)
            prom_initialize_tce_table();
#endif

      /*
       * On non-powermacs, try to instantiate RTAS and puts all CPUs
       * in spin-loops. PowerMacs don't have a working RTAS and use
       * a different way to spin CPUs
       */
      if (RELOC(of_platform) != PLATFORM_POWERMAC) {
            prom_instantiate_rtas();
            prom_hold_cpus();
      }

      /*
       * Fill in some infos for use by the kernel later on
       */
#ifdef CONFIG_PPC64
      if (RELOC(prom_iommu_off))
            prom_setprop(_prom->chosen, "/chosen", "linux,iommu-off",
                       NULL, 0);

      if (RELOC(prom_iommu_force_on))
            prom_setprop(_prom->chosen, "/chosen", "linux,iommu-force-on",
                       NULL, 0);

      if (RELOC(prom_tce_alloc_start)) {
            prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-start",
                       &RELOC(prom_tce_alloc_start),
                       sizeof(prom_tce_alloc_start));
            prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-end",
                       &RELOC(prom_tce_alloc_end),
                       sizeof(prom_tce_alloc_end));
      }
#endif

      /*
       * Fixup any known bugs in the device-tree
       */
      fixup_device_tree();

      /*
       * Now finally create the flattened device-tree
       */
      prom_printf("copying OF device tree ...\n");
      flatten_device_tree();

      /*
       * in case stdin is USB and still active on IBM machines...
       * Unfortunately quiesce crashes on some powermacs if we have
       * closed stdin already (in particular the powerbook 101).
       */
      if (RELOC(of_platform) != PLATFORM_POWERMAC)
            prom_close_stdin();

      /*
       * Call OF "quiesce" method to shut down pending DMA's from
       * devices etc...
       */
      prom_printf("Calling quiesce ...\n");
      call_prom("quiesce", 0, 0);

      /*
       * And finally, call the kernel passing it the flattened device
       * tree and NULL as r5, thus triggering the new entry point which
       * is common to us and kexec
       */
      hdr = RELOC(dt_header_start);
      prom_printf("returning from prom_init\n");
      prom_debug("->dt_header_start=0x%x\n", hdr);

#ifdef CONFIG_PPC32
      reloc_got2(-offset);
#endif

      __start(hdr, KERNELBASE + offset, 0);

      return 0;
}

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