LXR linux/arch/powerpc/boot/of.c

   1/*
   2 * Copyright (C) Paul Mackerras 1997.
   3 *
   4 * This program is free software; you can redistribute it and/or
   5 * modify it under the terms of the GNU General Public License
   6 * as published by the Free Software Foundation; either version
   7 * 2 of the License, or (at your option) any later version.
   8 */
   9#include <stdarg.h>
  10#include <stddef.h>
  11#include "types.h"
  12#include "elf.h"
  13#include "string.h"
  14#include "stdio.h"
  15#include "page.h"
  16#include "ops.h"
  17
  18#include "of.h"
  19
  20/* Value picked to match that used by yaboot */
  21#define PROG_START      0x01400000      /* only used on 64-bit systems */
  22#define RAM_END         (512<<20)       /* Fixme: use OF */
  23#define ONE_MB          0x100000
  24
  25
  26
  27static unsigned long claim_base;
  28
  29static void *of_try_claim(unsigned long size)
  30{
  31        unsigned long addr = 0;
  32
  33        if (claim_base == 0)
  34                claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB);
  35
  36        for(; claim_base < RAM_END; claim_base += ONE_MB) {
  37#ifdef DEBUG
  38                printf("    trying: 0x%08lx\n\r", claim_base);
  39#endif
  40                addr = (unsigned long)of_claim(claim_base, size, 0);
  41                if ((void *)addr != (void *)-1)
  42                        break;
  43        }
  44        if (addr == 0)
  45                return NULL;
  46        claim_base = PAGE_ALIGN(claim_base + size);
  47        return (void *)addr;
  48}
  49
  50static void of_image_hdr(const void *hdr)
  51{
  52        const Elf64_Ehdr *elf64 = hdr;
  53
  54        if (elf64->e_ident[EI_CLASS] == ELFCLASS64) {
  55                /*
  56                 * Maintain a "magic" minimum address. This keeps some older
  57                 * firmware platforms running.
  58                 */
  59                if (claim_base < PROG_START)
  60                        claim_base = PROG_START;
  61        }
  62}
  63
  64void platform_init(unsigned long a1, unsigned long a2, void *promptr)
  65{
  66        platform_ops.image_hdr = of_image_hdr;
  67        platform_ops.malloc = of_try_claim;
  68        platform_ops.exit = of_exit;
  69        platform_ops.vmlinux_alloc = of_vmlinux_alloc;
  70
  71        dt_ops.finddevice = of_finddevice;
  72        dt_ops.getprop = of_getprop;
  73        dt_ops.setprop = of_setprop;
  74
  75        of_console_init();
  76
  77        of_init(promptr);
  78        loader_info.promptr = promptr;
  79        if (a1 && a2 && a2 != 0xdeadbeef) {
  80                loader_info.initrd_addr = a1;
  81                loader_info.initrd_size = a2;
  82        }
  83}
  84