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

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Bootwrapper for ePAPR compliant firmwares
   4 *
   5 * Copyright 2010 David Gibson <david@gibson.dropbear.id.au>, IBM Corporation.
   6 *
   7 * Based on earlier bootwrappers by:
   8 * (c) Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp,\
   9 *   and
  10 * Scott Wood <scottwood@freescale.com>
  11 * Copyright (c) 2007 Freescale Semiconductor, Inc.
  12 */
  13
  14#include "ops.h"
  15#include "stdio.h"
  16#include "io.h"
  17#include <libfdt.h>
  18
  19BSS_STACK(4096);
  20
  21#define EPAPR_SMAGIC    0x65504150
  22#define EPAPR_EMAGIC    0x45504150
  23
  24static unsigned epapr_magic;
  25static unsigned long ima_size;
  26static unsigned long fdt_addr;
  27
  28static void platform_fixups(void)
  29{
  30        if ((epapr_magic != EPAPR_EMAGIC)
  31            && (epapr_magic != EPAPR_SMAGIC))
  32                fatal("r6 contained 0x%08x instead of ePAPR magic number\n",
  33                      epapr_magic);
  34
  35        if (ima_size < (unsigned long)_end)
  36                printf("WARNING: Image loaded outside IMA!"
  37                       " (_end=%p, ima_size=0x%lx)\n", _end, ima_size);
  38        if (ima_size < fdt_addr)
  39                printf("WARNING: Device tree address is outside IMA!"
  40                       "(fdt_addr=0x%lx, ima_size=0x%lx)\n", fdt_addr,
  41                       ima_size);
  42        if (ima_size < fdt_addr + fdt_totalsize((void *)fdt_addr))
  43                printf("WARNING: Device tree extends outside IMA!"
  44                       " (fdt_addr=0x%lx, size=0x%x, ima_size=0x%lx\n",
  45                       fdt_addr, fdt_totalsize((void *)fdt_addr), ima_size);
  46}
  47
  48void epapr_platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
  49                         unsigned long r6, unsigned long r7)
  50{
  51        epapr_magic = r6;
  52        ima_size = r7;
  53        fdt_addr = r3;
  54
  55        /* FIXME: we should process reserve entries */
  56
  57        simple_alloc_init(_end, ima_size - (unsigned long)_end, 32, 64);
  58
  59        fdt_init((void *)fdt_addr);
  60
  61        serial_console_init();
  62        platform_ops.fixups = platform_fixups;
  63}
  64