Logo Search packages:      
Sourcecode: linux version File versions

setup.c

/*
 * Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/linkage.h>
#include <linux/mm.h>
#include <linux/blkdev.h>
#include <linux/bootmem.h>
#include <linux/pm.h>
#include <linux/smp.h>

#include <asm/bootinfo.h>
#include <asm/reboot.h>
#include <asm/sibyte/board.h>
#include <asm/smp-ops.h>

#include <asm/fw/cfe/cfe_api.h>
#include <asm/fw/cfe/cfe_error.h>

/* Max ram addressable in 32-bit segments */
#ifdef CONFIG_64BIT
#define MAX_RAM_SIZE (~0ULL)
#else
#ifdef CONFIG_HIGHMEM
#ifdef CONFIG_64BIT_PHYS_ADDR
#define MAX_RAM_SIZE (~0ULL)
#else
#define MAX_RAM_SIZE (0xffffffffULL)
#endif
#else
#define MAX_RAM_SIZE (0x1fffffffULL)
#endif
#endif

#define SIBYTE_MAX_MEM_REGIONS 8
phys_t board_mem_region_addrs[SIBYTE_MAX_MEM_REGIONS];
phys_t board_mem_region_sizes[SIBYTE_MAX_MEM_REGIONS];
unsigned int board_mem_region_count;

int cfe_cons_handle;

#ifdef CONFIG_BLK_DEV_INITRD
extern unsigned long initrd_start, initrd_end;
#endif

static void __noreturn cfe_linux_exit(void *arg)
{
      int warm = *(int *)arg;

      if (smp_processor_id()) {
            static int reboot_smp;

            /* Don't repeat the process from another CPU */
            if (!reboot_smp) {
                  /* Get CPU 0 to do the cfe_exit */
                  reboot_smp = 1;
                  smp_call_function(cfe_linux_exit, arg, 0);
            }
      } else {
            printk("Passing control back to CFE...\n");
            cfe_exit(warm, 0);
            printk("cfe_exit returned??\n");
      }
      while (1);
}

static void __noreturn cfe_linux_restart(char *command)
{
      static const int zero;

      cfe_linux_exit((void *)&zero);
}

static void __noreturn cfe_linux_halt(void)
{
      static const int one = 1;

      cfe_linux_exit((void *)&one);
}

static __init void prom_meminit(void)
{
      u64 addr, size, type; /* regardless of 64BIT_PHYS_ADDR */
      int mem_flags = 0;
      unsigned int idx;
      int rd_flag;
#ifdef CONFIG_BLK_DEV_INITRD
      unsigned long initrd_pstart;
      unsigned long initrd_pend;

      initrd_pstart = CPHYSADDR(initrd_start);
      initrd_pend = CPHYSADDR(initrd_end);
      if (initrd_start &&
          ((initrd_pstart > MAX_RAM_SIZE)
           || (initrd_pend > MAX_RAM_SIZE))) {
            panic("initrd out of addressable memory");
      }

#endif /* INITRD */

      for (idx = 0; cfe_enummem(idx, mem_flags, &addr, &size, &type) != CFE_ERR_NOMORE;
           idx++) {
            rd_flag = 0;
            if (type == CFE_MI_AVAILABLE) {
                  /*
                   * See if this block contains (any portion of) the
                   * ramdisk
                   */
#ifdef CONFIG_BLK_DEV_INITRD
                  if (initrd_start) {
                        if ((initrd_pstart > addr) &&
                            (initrd_pstart < (addr + size))) {
                              add_memory_region(addr,
                                                initrd_pstart - addr,
                                                BOOT_MEM_RAM);
                              rd_flag = 1;
                        }
                        if ((initrd_pend > addr) &&
                            (initrd_pend < (addr + size))) {
                              add_memory_region(initrd_pend,
                                    (addr + size) - initrd_pend,
                                     BOOT_MEM_RAM);
                              rd_flag = 1;
                        }
                  }
#endif
                  if (!rd_flag) {
                        if (addr > MAX_RAM_SIZE)
                              continue;
                        if (addr+size > MAX_RAM_SIZE)
                              size = MAX_RAM_SIZE - (addr+size) + 1;
                        /*
                         * memcpy/__copy_user prefetch, which
                         * will cause a bus error for
                         * KSEG/KUSEG addrs not backed by RAM.
                         * Hence, reserve some padding for the
                         * prefetch distance.
                         */
                        if (size > 512)
                              size -= 512;
                        add_memory_region(addr, size, BOOT_MEM_RAM);
                  }
                  board_mem_region_addrs[board_mem_region_count] = addr;
                  board_mem_region_sizes[board_mem_region_count] = size;
                  board_mem_region_count++;
                  if (board_mem_region_count ==
                      SIBYTE_MAX_MEM_REGIONS) {
                        /*
                         * Too many regions.  Need to configure more
                         */
                        while(1);
                  }
            }
      }
#ifdef CONFIG_BLK_DEV_INITRD
      if (initrd_start) {
            add_memory_region(initrd_pstart, initrd_pend - initrd_pstart,
                          BOOT_MEM_RESERVED);
      }
#endif
}

#ifdef CONFIG_BLK_DEV_INITRD
static int __init initrd_setup(char *str)
{
      char rdarg[64];
      int idx;
      char *tmp, *endptr;
      unsigned long initrd_size;

      /* Make a copy of the initrd argument so we can smash it up here */
      for (idx = 0; idx < sizeof(rdarg)-1; idx++) {
            if (!str[idx] || (str[idx] == ' ')) break;
            rdarg[idx] = str[idx];
      }

      rdarg[idx] = 0;
      str = rdarg;

      /*
       *Initrd location comes in the form "<hex size of ramdisk in bytes>@<location in memory>"
       *  e.g. initrd=3abfd@80010000.  This is set up by the loader.
       */
      for (tmp = str; *tmp != '@'; tmp++) {
            if (!*tmp) {
                  goto fail;
            }
      }
      *tmp = 0;
      tmp++;
      if (!*tmp) {
            goto fail;
      }
      initrd_size = simple_strtoul(str, &endptr, 16);
      if (*endptr) {
            *(tmp-1) = '@';
            goto fail;
      }
      *(tmp-1) = '@';
      initrd_start = simple_strtoul(tmp, &endptr, 16);
      if (*endptr) {
            goto fail;
      }
      initrd_end = initrd_start + initrd_size;
      printk("Found initrd of %lx@%lx\n", initrd_size, initrd_start);
      return 1;
 fail:
      printk("Bad initrd argument.  Disabling initrd\n");
      initrd_start = 0;
      initrd_end = 0;
      return 1;
}

#endif

extern struct plat_smp_ops sb_smp_ops;
extern struct plat_smp_ops bcm1480_smp_ops;

/*
 * prom_init is called just after the cpu type is determined, from setup_arch()
 */
void __init prom_init(void)
{
      uint64_t cfe_ept, cfe_handle;
      unsigned int cfe_eptseal;
      int argc = fw_arg0;
      char **envp = (char **) fw_arg2;
      int *prom_vec = (int *) fw_arg3;

      _machine_restart   = cfe_linux_restart;
      _machine_halt      = cfe_linux_halt;
      pm_power_off = cfe_linux_halt;

      /*
       * Check if a loader was used; if NOT, the 4 arguments are
       * what CFE gives us (handle, 0, EPT and EPTSEAL)
       */
      if (argc < 0) {
            cfe_handle = (uint64_t)(long)argc;
            cfe_ept = (long)envp;
            cfe_eptseal = (uint32_t)(unsigned long)prom_vec;
      } else {
            if ((int32_t)(long)prom_vec < 0) {
                  /*
                   * Old loader; all it gives us is the handle,
                   * so use the "known" entrypoint and assume
                   * the seal.
                   */
                  cfe_handle = (uint64_t)(long)prom_vec;
                  cfe_ept = (uint64_t)((int32_t)0x9fc00500);
                  cfe_eptseal = CFE_EPTSEAL;
            } else {
                  /*
                   * Newer loaders bundle the handle/ept/eptseal
                   * Note: prom_vec is in the loader's useg
                   * which is still alive in the TLB.
                   */
                  cfe_handle = (uint64_t)((int32_t *)prom_vec)[0];
                  cfe_ept = (uint64_t)((int32_t *)prom_vec)[2];
                  cfe_eptseal = (unsigned int)((uint32_t *)prom_vec)[3];
            }
      }
      if (cfe_eptseal != CFE_EPTSEAL) {
            /* too early for panic to do any good */
            printk("CFE's entrypoint seal doesn't match. Spinning.");
            while (1) ;
      }
      cfe_init(cfe_handle, cfe_ept);
      /*
       * Get the handle for (at least) prom_putchar, possibly for
       * boot console
       */
      cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
      if (cfe_getenv("LINUX_CMDLINE", arcs_cmdline, CL_SIZE) < 0) {
            if (argc < 0) {
                  /*
                   * It's OK for direct boot to not provide a
                   *  command line
                   */
                  strcpy(arcs_cmdline, "root=/dev/ram0 ");
            } else {
                  /* The loader should have set the command line */
                  /* too early for panic to do any good */
                  printk("LINUX_CMDLINE not defined in cfe.");
                  while (1) ;
            }
      }

#ifdef CONFIG_BLK_DEV_INITRD
      {
            char *ptr;
            /* Need to find out early whether we've got an initrd.  So scan
               the list looking now */
            for (ptr = arcs_cmdline; *ptr; ptr++) {
                  while (*ptr == ' ') {
                        ptr++;
                  }
                  if (!strncmp(ptr, "initrd=", 7)) {
                        initrd_setup(ptr+7);
                        break;
                  } else {
                        while (*ptr && (*ptr != ' ')) {
                              ptr++;
                        }
                  }
            }
      }
#endif /* CONFIG_BLK_DEV_INITRD */

      /* Not sure this is needed, but it's the safe way. */
      arcs_cmdline[CL_SIZE-1] = 0;

      prom_meminit();

#if defined(CONFIG_SIBYTE_BCM112X) || defined(CONFIG_SIBYTE_SB1250)
      register_smp_ops(&sb_smp_ops);
#endif
#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
      register_smp_ops(&bcm1480_smp_ops);
#endif
}

void __init prom_free_prom_memory(void)
{
      /* Not sure what I'm supposed to do here.  Nothing, I think */
}

void prom_putchar(char c)
{
      int ret;

      while ((ret = cfe_write(cfe_cons_handle, &c, 1)) == 0)
            ;
}

Generated by  Doxygen 1.6.0   Back to index