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
  27 static unsigned long claim_base;
  28
  29 void epapr_platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
  30                          unsigned long r6, unsigned long r7);
  31
  32 static void *of_try_claim(unsigned long size)
  33 {
  34         unsigned long addr = 0;
  35
  36         if (claim_base == 0)
  37                 claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB);
  38
  39         for(; claim_base < RAM_END; claim_base += ONE_MB) {
  40 #ifdef DEBUG
  41                 printf("    trying: 0x%08lx\n\r", claim_base);
  42 #endif
  43                 addr = (unsigned long) of_claim(claim_base, size, 0);
  44                 if (addr != PROM_ERROR)
  45                         break;
  46         }
  47         if (addr == 0)
  48                 return NULL;
  49         claim_base = PAGE_ALIGN(claim_base + size);
  50         return (void *)addr;
  51 }
  52
  53 static void of_image_hdr(const void *hdr)
  54 {
  55         const Elf64_Ehdr *elf64 = hdr;
  56
  57         if (elf64->e_ident[EI_CLASS] == ELFCLASS64) {
  58                 /*
  59                  * Maintain a "magic" minimum address. This keeps some older
  60                  * firmware platforms running.
  61                  */
  62                 if (claim_base < PROG_START)
  63                         claim_base = PROG_START;
  64         }
  65 }
  66
  67 static void of_platform_init(unsigned long a1, unsigned long a2, void *promptr)
  68 {
  69         platform_ops.image_hdr = of_image_hdr;
  70         platform_ops.malloc = of_try_claim;
  71         platform_ops.exit = of_exit;
  72         platform_ops.vmlinux_alloc = of_vmlinux_alloc;
  73
  74         dt_ops.finddevice = of_finddevice;
  75         dt_ops.getprop = of_getprop;
  76         dt_ops.setprop = of_setprop;
  77
  78         of_console_init();
  79
  80         of_init(promptr);
  81         loader_info.promptr = promptr;
  82         if (a1 && a2 && a2 != 0xdeadbeef) {
  83                 loader_info.initrd_addr = a1;
  84                 loader_info.initrd_size = a2;
  85         }
  86 }
  87
  88 void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
  89                    unsigned long r6, unsigned long r7)
  90 {
  91         /* Detect OF vs. ePAPR boot */
  92         if (r5)
  93                 of_platform_init(r3, r4, (void *)r5);
  94         else
  95                 epapr_platform_init(r3, r4, r5, r6, r7);
  96 }
  97