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bootx_init.c

/*
 *  Early boot support code for BootX bootloader
 *
 *  Copyright (C) 2005 Ben. Herrenschmidt (benh@kernel.crashing.org)
 *
 *  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.
 */

#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/utsrelease.h>
#include <asm/sections.h>
#include <asm/prom.h>
#include <asm/page.h>
#include <asm/bootx.h>
#include <asm/btext.h>
#include <asm/io.h>

#undef DEBUG
#define SET_BOOT_BAT

#ifdef DEBUG
#define DBG(fmt...) do { bootx_printf(fmt); } while(0)
#else
#define DBG(fmt...) do { } while(0)
#endif

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

static unsigned long __initdata bootx_dt_strbase;
static unsigned long __initdata bootx_dt_strend;
static unsigned long __initdata bootx_node_chosen;
static boot_infos_t * __initdata bootx_info;
static char __initdata bootx_disp_path[256];

/* Is boot-info compatible ? */
#define BOOT_INFO_IS_COMPATIBLE(bi) \
      ((bi)->compatible_version <= BOOT_INFO_VERSION)
#define BOOT_INFO_IS_V2_COMPATIBLE(bi)    ((bi)->version >= 2)
#define BOOT_INFO_IS_V4_COMPATIBLE(bi)    ((bi)->version >= 4)

#ifdef CONFIG_BOOTX_TEXT
static void __init bootx_printf(const char *format, ...)
{
      const char *p, *q, *s;
      va_list args;
      unsigned long v;

      va_start(args, format);
      for (p = format; *p != 0; p = q) {
            for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
                  ;
            if (q > p)
                  btext_drawtext(p, q - p);
            if (*q == 0)
                  break;
            if (*q == '\n') {
                  ++q;
                  btext_flushline();
                  btext_drawstring("\r\n");
                  btext_flushline();
                  continue;
            }
            ++q;
            if (*q == 0)
                  break;
            switch (*q) {
            case 's':
                  ++q;
                  s = va_arg(args, const char *);
                  if (s == NULL)
                        s = "<NULL>";
                  btext_drawstring(s);
                  break;
            case 'x':
                  ++q;
                  v = va_arg(args, unsigned long);
                  btext_drawhex(v);
                  break;
            }
      }
}
#else /* CONFIG_BOOTX_TEXT */
static void __init bootx_printf(const char *format, ...) {}
#endif /* CONFIG_BOOTX_TEXT */

static void * __init bootx_early_getprop(unsigned long base,
                               unsigned long node,
                               char *prop)
{
      struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
      u32 *ppp = &np->properties;

      while(*ppp) {
            struct bootx_dt_prop *pp =
                  (struct bootx_dt_prop *)(base + *ppp);

            if (strcmp((char *)((unsigned long)pp->name + base),
                     prop) == 0) {
                  return (void *)((unsigned long)pp->value + base);
            }
            ppp = &pp->next;
      }
      return NULL;
}

#define dt_push_token(token, mem) \
      do { \
            *(mem) = _ALIGN_UP(*(mem),4); \
            *((u32 *)*(mem)) = token; \
            *(mem) += 4; \
      } while(0)

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

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

static void __init bootx_dt_add_prop(char *name, void *data, int size,
                          unsigned long *mem_end)
{
      unsigned long soff = bootx_dt_find_string(name);
      if (data == NULL)
            size = 0;
      if (soff == 0) {
            bootx_printf("WARNING: Can't find string index for <%s>\n",
                       name);
            return;
      }
      if (size > 0x20000) {
            bootx_printf("WARNING: ignoring large property ");
            bootx_printf("%s length 0x%x\n", name, size);
            return;
      }
      dt_push_token(OF_DT_PROP, mem_end);
      dt_push_token(size, mem_end);
      dt_push_token(soff, mem_end);

      /* push property content */
      if (size && data) {
            memcpy((void *)*mem_end, data, size);
            *mem_end = _ALIGN_UP(*mem_end + size, 4);
      }
}

static void __init bootx_add_chosen_props(unsigned long base,
                                unsigned long *mem_end)
{
      u32 val;

      bootx_dt_add_prop("linux,bootx", NULL, 0, mem_end);

      if (bootx_info->kernelParamsOffset) {
            char *args = (char *)((unsigned long)bootx_info) +
                  bootx_info->kernelParamsOffset;
            bootx_dt_add_prop("bootargs", args, strlen(args) + 1, mem_end);
      }
      if (bootx_info->ramDisk) {
            val = ((unsigned long)bootx_info) + bootx_info->ramDisk;
            bootx_dt_add_prop("linux,initrd-start", &val, 4, mem_end);
            val += bootx_info->ramDiskSize;
            bootx_dt_add_prop("linux,initrd-end", &val, 4, mem_end);
      }
      if (strlen(bootx_disp_path))
            bootx_dt_add_prop("linux,stdout-path", bootx_disp_path,
                          strlen(bootx_disp_path) + 1, mem_end);
}

static void __init bootx_add_display_props(unsigned long base,
                                 unsigned long *mem_end,
                                 int has_real_node)
{
      boot_infos_t *bi = bootx_info;
      u32 tmp;

      if (has_real_node) {
            bootx_dt_add_prop("linux,boot-display", NULL, 0, mem_end);
            bootx_dt_add_prop("linux,opened", NULL, 0, mem_end);
      } else
            bootx_dt_add_prop("linux,bootx-noscreen", NULL, 0, mem_end);

      tmp = bi->dispDeviceDepth;
      bootx_dt_add_prop("linux,bootx-depth", &tmp, 4, mem_end);
      tmp = bi->dispDeviceRect[2] - bi->dispDeviceRect[0];
      bootx_dt_add_prop("linux,bootx-width", &tmp, 4, mem_end);
      tmp = bi->dispDeviceRect[3] - bi->dispDeviceRect[1];
      bootx_dt_add_prop("linux,bootx-height", &tmp, 4, mem_end);
      tmp = bi->dispDeviceRowBytes;
      bootx_dt_add_prop("linux,bootx-linebytes", &tmp, 4, mem_end);
      tmp = (u32)bi->dispDeviceBase;
      if (tmp == 0)
            tmp = (u32)bi->logicalDisplayBase;
      tmp += bi->dispDeviceRect[1] * bi->dispDeviceRowBytes;
      tmp += bi->dispDeviceRect[0] * ((bi->dispDeviceDepth + 7) / 8);
      bootx_dt_add_prop("linux,bootx-addr", &tmp, 4, mem_end);
}

static void __init bootx_dt_add_string(char *s, unsigned long *mem_end)
{
      unsigned int l = strlen(s) + 1;
      memcpy((void *)*mem_end, s, l);
      bootx_dt_strend = *mem_end = *mem_end + l;
}

static void __init bootx_scan_dt_build_strings(unsigned long base,
                                     unsigned long node,
                                     unsigned long *mem_end)
{
      struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
      u32 *cpp, *ppp = &np->properties;
      unsigned long soff;
      char *namep;

      /* Keep refs to known nodes */
      namep = np->full_name ? (char *)(base + np->full_name) : NULL;
            if (namep == NULL) {
            bootx_printf("Node without a full name !\n");
            namep = "";
      }
      DBG("* strings: %s\n", namep);

      if (!strcmp(namep, "/chosen")) {
            DBG(" detected /chosen ! adding properties names !\n");
            bootx_dt_add_string("linux,bootx", mem_end);
            bootx_dt_add_string("linux,stdout-path", mem_end);
            bootx_dt_add_string("linux,initrd-start", mem_end);
            bootx_dt_add_string("linux,initrd-end", mem_end);
            bootx_dt_add_string("bootargs", mem_end);
            bootx_node_chosen = node;
      }
      if (node == bootx_info->dispDeviceRegEntryOffset) {
            DBG(" detected display ! adding properties names !\n");
            bootx_dt_add_string("linux,boot-display", mem_end);
            bootx_dt_add_string("linux,opened", mem_end);
            strncpy(bootx_disp_path, namep, 255);
      }

      /* get and store all property names */
      while (*ppp) {
            struct bootx_dt_prop *pp =
                  (struct bootx_dt_prop *)(base + *ppp);

            namep = pp->name ? (char *)(base + pp->name) : NULL;
            if (namep == NULL || strcmp(namep, "name") == 0)
                  goto next;
            /* get/create string entry */
            soff = bootx_dt_find_string(namep);
            if (soff == 0)
                  bootx_dt_add_string(namep, mem_end);
      next:
            ppp = &pp->next;
      }

      /* do all our children */
      cpp = &np->child;
      while(*cpp) {
            np = (struct bootx_dt_node *)(base + *cpp);
            bootx_scan_dt_build_strings(base, *cpp, mem_end);
            cpp = &np->sibling;
      }
}

static void __init bootx_scan_dt_build_struct(unsigned long base,
                                    unsigned long node,
                                    unsigned long *mem_end)
{
      struct bootx_dt_node *np = (struct bootx_dt_node *)(base + node);
      u32 *cpp, *ppp = &np->properties;
      char *namep, *p, *ep, *lp;
      int l;

      dt_push_token(OF_DT_BEGIN_NODE, mem_end);

      /* get the node's full name */
      namep = np->full_name ? (char *)(base + np->full_name) : NULL;
      if (namep == NULL)
            namep = "";
      l = strlen(namep);

      DBG("* struct: %s\n", namep);

      /* 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 '/').
       */
      memcpy((void *)*mem_end, namep, l + 1);
      namep = (char *)*mem_end;
      for (lp = p = namep, ep = namep + l; p < ep; p++) {
            if (*p == '/')
                  lp = namep;
            else if (*p != 0)
                  *lp++ = *p;
      }
      *lp = 0;
      *mem_end = _ALIGN_UP((unsigned long)lp + 1, 4);

      /* get and store all properties */
      while (*ppp) {
            struct bootx_dt_prop *pp =
                  (struct bootx_dt_prop *)(base + *ppp);

            namep = pp->name ? (char *)(base + pp->name) : NULL;
            /* Skip "name" */
            if (namep == NULL || !strcmp(namep, "name"))
                  goto next;
            /* Skip "bootargs" in /chosen too as we replace it */
            if (node == bootx_node_chosen && !strcmp(namep, "bootargs"))
                  goto next;

            /* push property head */
            bootx_dt_add_prop(namep,
                          pp->value ? (void *)(base + pp->value): NULL,
                          pp->length, mem_end);
      next:
            ppp = &pp->next;
      }

      if (node == bootx_node_chosen) {
            bootx_add_chosen_props(base, mem_end);
            if (bootx_info->dispDeviceRegEntryOffset == 0)
                  bootx_add_display_props(base, mem_end, 0);
      }
      else if (node == bootx_info->dispDeviceRegEntryOffset)
            bootx_add_display_props(base, mem_end, 1);

      /* do all our children */
      cpp = &np->child;
      while(*cpp) {
            np = (struct bootx_dt_node *)(base + *cpp);
            bootx_scan_dt_build_struct(base, *cpp, mem_end);
            cpp = &np->sibling;
      }

      dt_push_token(OF_DT_END_NODE, mem_end);
}

static unsigned long __init bootx_flatten_dt(unsigned long start)
{
      boot_infos_t *bi = bootx_info;
      unsigned long mem_start, mem_end;
      struct boot_param_header *hdr;
      unsigned long base;
      u64 *rsvmap;

      /* Start using memory after the big blob passed by BootX, get
       * some space for the header
       */
      mem_start = mem_end = _ALIGN_UP(((unsigned long)bi) + start, 4);
      DBG("Boot params header at: %x\n", mem_start);
      hdr = (struct boot_param_header *)mem_start;
      mem_end += sizeof(struct boot_param_header);
      rsvmap = (u64 *)(_ALIGN_UP(mem_end, 8));
      hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - mem_start;
      mem_end = ((unsigned long)rsvmap) + 8 * sizeof(u64);

      /* Get base of tree */
      base = ((unsigned long)bi) + bi->deviceTreeOffset;

      /* Build string array */
      DBG("Building string array at: %x\n", mem_end);
      DBG("Device Tree Base=%x\n", base);
      bootx_dt_strbase = mem_end;
      mem_end += 4;
      bootx_dt_strend = mem_end;
      bootx_scan_dt_build_strings(base, 4, &mem_end);
      /* Add some strings */
      bootx_dt_add_string("linux,bootx-noscreen", &mem_end);
      bootx_dt_add_string("linux,bootx-depth", &mem_end);
      bootx_dt_add_string("linux,bootx-width", &mem_end);
      bootx_dt_add_string("linux,bootx-height", &mem_end);
      bootx_dt_add_string("linux,bootx-linebytes", &mem_end);
      bootx_dt_add_string("linux,bootx-addr", &mem_end);
      /* Wrap up strings */
      hdr->off_dt_strings = bootx_dt_strbase - mem_start;
      hdr->dt_strings_size = bootx_dt_strend - bootx_dt_strbase;

      /* Build structure */
      mem_end = _ALIGN(mem_end, 16);
      DBG("Building device tree structure at: %x\n", mem_end);
      hdr->off_dt_struct = mem_end - mem_start;
      bootx_scan_dt_build_struct(base, 4, &mem_end);
      dt_push_token(OF_DT_END, &mem_end);

      /* Finish header */
      hdr->boot_cpuid_phys = 0;
      hdr->magic = OF_DT_HEADER;
      hdr->totalsize = mem_end - mem_start;
      hdr->version = OF_DT_VERSION;
      /* Version 16 is not backward compatible */
      hdr->last_comp_version = 0x10;

      /* Reserve the whole thing and copy the reserve map in, we
       * also bump mem_reserve_cnt to cause further reservations to
       * fail since it's too late.
       */
      mem_end = _ALIGN(mem_end, PAGE_SIZE);
      DBG("End of boot params: %x\n", mem_end);
      rsvmap[0] = mem_start;
      rsvmap[1] = mem_end;
      if (bootx_info->ramDisk) {
            rsvmap[2] = ((unsigned long)bootx_info) + bootx_info->ramDisk;
            rsvmap[3] = rsvmap[2] + bootx_info->ramDiskSize;
            rsvmap[4] = 0;
            rsvmap[5] = 0;
      } else {
            rsvmap[2] = 0;
            rsvmap[3] = 0;
      }

      return (unsigned long)hdr;
}


#ifdef CONFIG_BOOTX_TEXT
static void __init btext_welcome(boot_infos_t *bi)
{
      unsigned long flags;
      unsigned long pvr;

      bootx_printf("Welcome to Linux, kernel " UTS_RELEASE "\n");
      bootx_printf("\nlinked at        : 0x%x", KERNELBASE);
      bootx_printf("\nframe buffer at  : 0x%x", bi->dispDeviceBase);
      bootx_printf(" (phys), 0x%x", bi->logicalDisplayBase);
      bootx_printf(" (log)");
      bootx_printf("\nklimit           : 0x%x",(unsigned long)klimit);
      bootx_printf("\nboot_info at     : 0x%x", bi);
      __asm__ __volatile__ ("mfmsr %0" : "=r" (flags));
      bootx_printf("\nMSR              : 0x%x", flags);
      __asm__ __volatile__ ("mfspr %0, 287" : "=r" (pvr));
      bootx_printf("\nPVR              : 0x%x", pvr);
      pvr >>= 16;
      if (pvr > 1) {
          __asm__ __volatile__ ("mfspr %0, 1008" : "=r" (flags));
          bootx_printf("\nHID0             : 0x%x", flags);
      }
      if (pvr == 8 || pvr == 12 || pvr == 0x800c) {
          __asm__ __volatile__ ("mfspr %0, 1019" : "=r" (flags));
          bootx_printf("\nICTC             : 0x%x", flags);
      }
#ifdef DEBUG
      bootx_printf("\n\n");
      bootx_printf("bi->deviceTreeOffset   : 0x%x\n",
                 bi->deviceTreeOffset);
      bootx_printf("bi->deviceTreeSize     : 0x%x\n",
                 bi->deviceTreeSize);
#endif
      bootx_printf("\n\n");
}
#endif /* CONFIG_BOOTX_TEXT */

void __init bootx_init(unsigned long r3, unsigned long r4)
{
      boot_infos_t *bi = (boot_infos_t *) r4;
      unsigned long hdr;
      unsigned long space;
      unsigned long ptr, x;
      char *model;
      unsigned long offset = reloc_offset();

      reloc_got2(offset);

      bootx_info = bi;

      /* We haven't cleared any bss at this point, make sure
       * what we need is initialized
       */
      bootx_dt_strbase = bootx_dt_strend = 0;
      bootx_node_chosen = 0;
      bootx_disp_path[0] = 0;

      if (!BOOT_INFO_IS_V2_COMPATIBLE(bi))
            bi->logicalDisplayBase = bi->dispDeviceBase;

      /* Fixup depth 16 -> 15 as that's what MacOS calls 16bpp */
      if (bi->dispDeviceDepth == 16)
            bi->dispDeviceDepth = 15;


#ifdef CONFIG_BOOTX_TEXT
      ptr = (unsigned long)bi->logicalDisplayBase;
      ptr += bi->dispDeviceRect[1] * bi->dispDeviceRowBytes;
      ptr += bi->dispDeviceRect[0] * ((bi->dispDeviceDepth + 7) / 8);
      btext_setup_display(bi->dispDeviceRect[2] - bi->dispDeviceRect[0],
                      bi->dispDeviceRect[3] - bi->dispDeviceRect[1],
                      bi->dispDeviceDepth, bi->dispDeviceRowBytes,
                      (unsigned long)bi->logicalDisplayBase);
      btext_clearscreen();
      btext_flushscreen();
#endif /* CONFIG_BOOTX_TEXT */

      /*
       * Test if boot-info is compatible.  Done only in config
       * CONFIG_BOOTX_TEXT since there is nothing much we can do
       * with an incompatible version, except display a message
       * and eventually hang the processor...
       *
       * I'll try to keep enough of boot-info compatible in the
       * future to always allow display of this message;
       */
      if (!BOOT_INFO_IS_COMPATIBLE(bi)) {
            bootx_printf(" !!! WARNING - Incompatible version"
                       " of BootX !!!\n\n\n");
            for (;;)
                  ;
      }
      if (bi->architecture != BOOT_ARCH_PCI) {
            bootx_printf(" !!! WARNING - Usupported machine"
                       " architecture !\n");
            for (;;)
                  ;
      }

#ifdef CONFIG_BOOTX_TEXT
      btext_welcome(bi);
#endif

      /* New BootX enters kernel with MMU off, i/os are not allowed
       * here. This hack will have been done by the boostrap anyway.
       */
      if (bi->version < 4) {
            /*
             * XXX If this is an iMac, turn off the USB controller.
             */
            model = (char *) bootx_early_getprop(r4 + bi->deviceTreeOffset,
                                         4, "model");
            if (model
                && (strcmp(model, "iMac,1") == 0
                  || strcmp(model, "PowerMac1,1") == 0)) {
                  bootx_printf("iMac,1 detected, shutting down USB \n");
                  out_le32((unsigned __iomem *)0x80880008, 1);    /* XXX */
            }
      }

      /* Get a pointer that points above the device tree, args, ramdisk,
       * etc... to use for generating the flattened tree
       */
      if (bi->version < 5) {
            space = bi->deviceTreeOffset + bi->deviceTreeSize;
            if (bi->ramDisk >= space)
                  space = bi->ramDisk + bi->ramDiskSize;
      } else
            space = bi->totalParamsSize;

      bootx_printf("Total space used by parameters & ramdisk: 0x%x \n", space);

      /* New BootX will have flushed all TLBs and enters kernel with
       * MMU switched OFF, so this should not be useful anymore.
       */
      if (bi->version < 4) {
            bootx_printf("Touching pages...\n");

            /*
             * Touch each page to make sure the PTEs for them
             * are in the hash table - the aim is to try to avoid
             * getting DSI exceptions while copying the kernel image.
             */
            for (ptr = ((unsigned long) &_stext) & PAGE_MASK;
                 ptr < (unsigned long)bi + space; ptr += PAGE_SIZE)
                  x = *(volatile unsigned long *)ptr;
      }

      /* Ok, now we need to generate a flattened device-tree to pass
       * to the kernel
       */
      bootx_printf("Preparing boot params...\n");

      hdr = bootx_flatten_dt(space);

#ifdef CONFIG_BOOTX_TEXT
#ifdef SET_BOOT_BAT
      bootx_printf("Preparing BAT...\n");
      btext_prepare_BAT();
#else
      btext_unmap();
#endif
#endif

      reloc_got2(-offset);

      __start(hdr, KERNELBASE + offset, 0);
}

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