LXR linux/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
  23static unsigned long claim_base;
  24
  25void epapr_platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
  26                         unsigned long r6, unsigned long r7);
  27
  28static 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
  49static 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
  63static 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
  84void 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
  94