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