cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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epapr.c (1752B)

      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}