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
  19 BSS_STACK(4096);
  20
  21 #define EPAPR_SMAGIC    0x65504150
  22 #define EPAPR_EMAGIC    0x45504150
  23
  24 static unsigned epapr_magic;
  25 static unsigned long ima_size;
  26 static unsigned long fdt_addr;
  27
  28 static 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
  48 void 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 }