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https://github.com/torvalds/linux
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6c5b59b913
This is a first cut at making bootwrapper code which will produce a zImage compliant with the requirements set down by ePAPR. This is a very simple bootwrapper, taking the device tree blob supplied by the ePAPR boot program and passing it on to the kernel. It builds on the earlier patch to build a relocatable ET_DYN zImage to meet the other ePAPR image requirements. For good measure we have some paranoid checks which will generate warnings if some of the ePAPR entry condition guarantees are not met. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
66 lines
1.9 KiB
C
66 lines
1.9 KiB
C
/*
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* Bootwrapper for ePAPR compliant firmwares
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*
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* Copyright 2010 David Gibson <david@gibson.dropbear.id.au>, IBM Corporation.
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*
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* Based on earlier bootwrappers by:
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* (c) Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp,\
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* and
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* Scott Wood <scottwood@freescale.com>
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* Copyright (c) 2007 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include "ops.h"
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#include "stdio.h"
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#include "io.h"
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#include <libfdt.h>
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BSS_STACK(4096);
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#define EPAPR_SMAGIC 0x65504150
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#define EPAPR_EMAGIC 0x45504150
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static unsigned epapr_magic;
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static unsigned long ima_size;
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static unsigned long fdt_addr;
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static void platform_fixups(void)
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{
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if ((epapr_magic != EPAPR_EMAGIC)
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&& (epapr_magic != EPAPR_SMAGIC))
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fatal("r6 contained 0x%08x instead of ePAPR magic number\n",
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epapr_magic);
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if (ima_size < (unsigned long)_end)
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printf("WARNING: Image loaded outside IMA!"
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" (_end=%p, ima_size=0x%lx)\n", _end, ima_size);
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if (ima_size < fdt_addr)
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printf("WARNING: Device tree address is outside IMA!"
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"(fdt_addr=0x%lx, ima_size=0x%lx)\n", fdt_addr,
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ima_size);
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if (ima_size < fdt_addr + fdt_totalsize((void *)fdt_addr))
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printf("WARNING: Device tree extends outside IMA!"
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" (fdt_addr=0x%lx, size=0x%x, ima_size=0x%lx\n",
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fdt_addr, fdt_totalsize((void *)fdt_addr), ima_size);
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}
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void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
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unsigned long r6, unsigned long r7)
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{
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epapr_magic = r6;
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ima_size = r7;
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fdt_addr = r3;
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/* FIXME: we should process reserve entries */
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simple_alloc_init(_end, ima_size - (unsigned long)_end, 32, 64);
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fdt_init((void *)fdt_addr);
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serial_console_init();
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platform_ops.fixups = platform_fixups;
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}
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