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https://github.com/edk2-porting/linux-next.git
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0c9fa29149
This makes the "OF" zImage wrapper (zImage.pseries, zImage.pmac, zImage.maple) work if booted via a flat device-tree (ePAPR boot mode), and thus potentially usable with kexec. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
/*
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* Copyright (C) Paul Mackerras 1997.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <stdarg.h>
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#include <stddef.h>
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#include "types.h"
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#include "elf.h"
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#include "string.h"
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#include "stdio.h"
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#include "page.h"
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#include "ops.h"
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#include "of.h"
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/* Value picked to match that used by yaboot */
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#define PROG_START 0x01400000 /* only used on 64-bit systems */
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#define RAM_END (512<<20) /* Fixme: use OF */
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#define ONE_MB 0x100000
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static unsigned long claim_base;
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void epapr_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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static void *of_try_claim(unsigned long size)
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{
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unsigned long addr = 0;
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if (claim_base == 0)
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claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB);
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for(; claim_base < RAM_END; claim_base += ONE_MB) {
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#ifdef DEBUG
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printf(" trying: 0x%08lx\n\r", claim_base);
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#endif
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addr = (unsigned long)of_claim(claim_base, size, 0);
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if ((void *)addr != (void *)-1)
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break;
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}
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if (addr == 0)
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return NULL;
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claim_base = PAGE_ALIGN(claim_base + size);
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return (void *)addr;
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}
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static void of_image_hdr(const void *hdr)
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{
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const Elf64_Ehdr *elf64 = hdr;
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if (elf64->e_ident[EI_CLASS] == ELFCLASS64) {
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/*
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* Maintain a "magic" minimum address. This keeps some older
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* firmware platforms running.
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*/
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if (claim_base < PROG_START)
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claim_base = PROG_START;
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}
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}
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static void of_platform_init(unsigned long a1, unsigned long a2, void *promptr)
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{
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platform_ops.image_hdr = of_image_hdr;
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platform_ops.malloc = of_try_claim;
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platform_ops.exit = of_exit;
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platform_ops.vmlinux_alloc = of_vmlinux_alloc;
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dt_ops.finddevice = of_finddevice;
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dt_ops.getprop = of_getprop;
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dt_ops.setprop = of_setprop;
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of_console_init();
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of_init(promptr);
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loader_info.promptr = promptr;
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if (a1 && a2 && a2 != 0xdeadbeef) {
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loader_info.initrd_addr = a1;
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loader_info.initrd_size = a2;
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}
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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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/* Detect OF vs. ePAPR boot */
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if (r5)
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of_platform_init(r3, r4, (void *)r5);
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else
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epapr_platform_init(r3, r4, r5, r6, r7);
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}
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