mirror of https://gitee.com/openkylin/linux.git
121 lines
2.9 KiB
C
121 lines
2.9 KiB
C
/*
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* Misc. bootloader code for many machines.
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*
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* Copyright 2001 MontaVista Software Inc.
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* Author: Matt Porter <mporter@mvista.com> Derived from
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* arch/ppc/boot/prep/misc.c
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*
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* Copyright (C) 2009 Lemote, Inc.
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* Author: Wu Zhangjin <wuzhangjin@gmail.com>
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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 as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <asm/addrspace.h>
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/* These two variables specify the free mem region
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* that can be used for temporary malloc area
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*/
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unsigned long free_mem_ptr;
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unsigned long free_mem_end_ptr;
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char *zimage_start;
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/* The linker tells us where the image is. */
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extern unsigned char __image_begin, __image_end;
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/* debug interfaces */
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extern void puts(const char *s);
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extern void puthex(unsigned long long val);
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void error(char *x)
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{
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puts("\n\n");
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puts(x);
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puts("\n\n -- System halted");
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while (1)
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; /* Halt */
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}
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/* activate the code for pre-boot environment */
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#define STATIC static
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#ifdef CONFIG_KERNEL_GZIP
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void *memcpy(void *dest, const void *src, size_t n)
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{
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int i;
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const char *s = src;
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char *d = dest;
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for (i = 0; i < n; i++)
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d[i] = s[i];
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return dest;
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}
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#include "../../../../lib/decompress_inflate.c"
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#endif
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#ifdef CONFIG_KERNEL_BZIP2
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void *memset(void *s, int c, size_t n)
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{
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int i;
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char *ss = s;
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for (i = 0; i < n; i++)
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ss[i] = c;
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return s;
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}
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#include "../../../../lib/decompress_bunzip2.c"
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#endif
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#ifdef CONFIG_KERNEL_LZMA
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#include "../../../../lib/decompress_unlzma.c"
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#endif
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#ifdef CONFIG_KERNEL_LZO
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#include "../../../../lib/decompress_unlzo.c"
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#endif
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void decompress_kernel(unsigned long boot_heap_start)
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{
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int zimage_size;
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/*
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* We link ourself to an arbitrary low address. When we run, we
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* relocate outself to that address. __image_beign points to
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* the part of the image where the zImage is. -- Tom
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*/
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zimage_start = (char *)(unsigned long)(&__image_begin);
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zimage_size = (unsigned long)(&__image_end) -
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(unsigned long)(&__image_begin);
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/*
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* The zImage and initrd will be between start and _end, so they've
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* already been moved once. We're good to go now. -- Tom
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*/
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puts("zimage at: ");
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puthex((unsigned long)zimage_start);
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puts(" ");
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puthex((unsigned long)(zimage_size + zimage_start));
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puts("\n");
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/* this area are prepared for mallocing when decompressing */
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free_mem_ptr = boot_heap_start;
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free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE;
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/* Display standard Linux/MIPS boot prompt for kernel args */
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puts("Uncompressing Linux at load address ");
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puthex(VMLINUX_LOAD_ADDRESS_ULL);
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puts("\n");
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/* Decompress the kernel with according algorithm */
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decompress(zimage_start, zimage_size, 0, 0,
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(void *)VMLINUX_LOAD_ADDRESS_ULL, 0, error);
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/* FIXME: is there a need to flush cache here? */
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puts("Now, booting the kernel...\n");
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}
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