arch/powerpc/boot/of.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) Paul Mackerras 1997.
   4  */
   5 #include <stdarg.h>
   6 #include <stddef.h>
   7 #include "types.h"
   8 #include "elf.h"
   9 #include "string.h"
  10 #include "stdio.h"
  11 #include "page.h"
  12 #include "ops.h"
  13
  14 #include "of.h"
  15
  16 /* Value picked to match that used by yaboot */
  17 #define PROG_START      0x01400000      /* only used on 64-bit systems */
  18 #define RAM_END         (512<<20)       /* Fixme: use OF */
  19 #define ONE_MB          0x100000
  20
  21
  22
  23 static unsigned long claim_base;
  24
  25 void epapr_platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
  26                          unsigned long r6, unsigned long r7);
  27
  28 static void *of_try_claim(unsigned long size)
  29 {
  30         unsigned long addr = 0;
  31
  32         if (claim_base == 0)
  33                 claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB);
  34
  35         for(; claim_base < RAM_END; claim_base += ONE_MB) {
  36 #ifdef DEBUG
  37                 printf("    trying: 0x%08lx\n\r", claim_base);
  38 #endif
  39                 addr = (unsigned long) of_claim(claim_base, size, 0);
  40                 if (addr != PROM_ERROR)
  41                         break;
  42         }
  43         if (addr == 0)
  44                 return NULL;
  45         claim_base = PAGE_ALIGN(claim_base + size);
  46         return (void *)addr;
  47 }
  48
  49 static void of_image_hdr(const void *hdr)
  50 {
  51         const Elf64_Ehdr *elf64 = hdr;
  52
  53         if (elf64->e_ident[EI_CLASS] == ELFCLASS64) {
  54                 /*
  55                  * Maintain a "magic" minimum address. This keeps some older
  56                  * firmware platforms running.
  57                  */
  58                 if (claim_base < PROG_START)
  59                         claim_base = PROG_START;
  60         }
  61 }
  62
  63 static void of_platform_init(unsigned long a1, unsigned long a2, void *promptr)
  64 {
  65         platform_ops.image_hdr = of_image_hdr;
  66         platform_ops.malloc = of_try_claim;
  67         platform_ops.exit = of_exit;
  68         platform_ops.vmlinux_alloc = of_vmlinux_alloc;
  69
  70         dt_ops.finddevice = of_finddevice;
  71         dt_ops.getprop = of_getprop;
  72         dt_ops.setprop = of_setprop;
  73
  74         of_console_init();
  75
  76         of_init(promptr);
  77         loader_info.promptr = promptr;
  78         if (a1 && a2 && a2 != 0xdeadbeef) {
  79                 loader_info.initrd_addr = a1;
  80                 loader_info.initrd_size = a2;
  81         }
  82 }
  83
  84 void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
  85                    unsigned long r6, unsigned long r7)
  86 {
  87         /* Detect OF vs. ePAPR boot */
  88         if (r5)
  89                 of_platform_init(r3, r4, (void *)r5);
  90         else
  91                 epapr_platform_init(r3, r4, r5, r6, r7);
  92 }
  93