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 extern char _end[];
  21
  22 /* Value picked to match that used by yaboot */
  23 #define PROG_START      0x01400000      /* only used on 64-bit systems */
  24 #define RAM_END         (512<<20)       /* Fixme: use OF */
  25 #define ONE_MB          0x100000
  26
  27
  28
  29 static unsigned long claim_base;
  30
  31 static void *of_try_claim(unsigned long size)
  32 {
  33         unsigned long addr = 0;
  34
  35         if (claim_base == 0)
  36                 claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB);
  37
  38         for(; claim_base < RAM_END; claim_base += ONE_MB) {
  39 #ifdef DEBUG
  40                 printf("    trying: 0x%08lx\n\r", claim_base);
  41 #endif
  42                 addr = (unsigned long)of_claim(claim_base, size, 0);
  43                 if ((void *)addr != (void *)-1)
  44                         break;
  45         }
  46         if (addr == 0)
  47                 return NULL;
  48         claim_base = PAGE_ALIGN(claim_base + size);
  49         return (void *)addr;
  50 }
  51
  52 static void of_image_hdr(const void *hdr)
  53 {
  54         const Elf64_Ehdr *elf64 = hdr;
  55
  56         if (elf64->e_ident[EI_CLASS] == ELFCLASS64) {
  57                 /*
  58                  * Maintain a "magic" minimum address. This keeps some older
  59                  * firmware platforms running.
  60                  */
  61                 if (claim_base < PROG_START)
  62                         claim_base = PROG_START;
  63         }
  64 }
  65
  66 void platform_init(unsigned long a1, unsigned long a2, void *promptr)
  67 {
  68         platform_ops.image_hdr = of_image_hdr;
  69         platform_ops.malloc = of_try_claim;
  70         platform_ops.exit = of_exit;
  71         platform_ops.vmlinux_alloc = of_vmlinux_alloc;
  72
  73         dt_ops.finddevice = of_finddevice;
  74         dt_ops.getprop = of_getprop;
  75         dt_ops.setprop = of_setprop;
  76
  77         of_console_init();
  78
  79         of_init(promptr);
  80         loader_info.promptr = promptr;
  81         if (a1 && a2 && a2 != 0xdeadbeef) {
  82                 loader_info.initrd_addr = a1;
  83                 loader_info.initrd_size = a2;
  84         }
  85 }