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/*
* Copyright 2001 MontaVista Software Inc.
* Author: Matt Porter <mporter@mvista.com>
*
* 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 <linux/string.h>
#include <linux/libfdt.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;
/* The linker tells us where the image is. */
extern unsigned char __image_begin, __image_end;
/* debug interfaces */
#ifdef CONFIG_DEBUG_ZBOOT
extern void puts(const char *s);
extern void puthex(unsigned long long val);
#else
#define puts(s) do {} while (0)
#define puthex(val) do {} while (0)
#endif
extern char __appended_dtb[];
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
#include "../../../../lib/decompress_inflate.c"
#endif
#ifdef CONFIG_KERNEL_BZIP2
#include "../../../../lib/decompress_bunzip2.c"
#endif
#ifdef CONFIG_KERNEL_LZ4
#include "../../../../lib/decompress_unlz4.c"
#endif
#ifdef CONFIG_KERNEL_LZMA
#include "../../../../lib/decompress_unlzma.c"
#endif
#ifdef CONFIG_KERNEL_LZO
#include "../../../../lib/decompress_unlzo.c"
#endif
#ifdef CONFIG_KERNEL_XZ
#include "../../../../lib/decompress_unxz.c"
#endif
unsigned long __stack_chk_guard;
void __stack_chk_guard_setup(void)
{
__stack_chk_guard = 0x000a0dff;
}
void __stack_chk_fail(void)
{
error("stack-protector: Kernel stack is corrupted\n");
}
void decompress_kernel(unsigned long boot_heap_start)
{
unsigned long zimage_start, zimage_size;
__stack_chk_guard_setup();
zimage_start = (unsigned long)(&__image_begin);
zimage_size = (unsigned long)(&__image_end) -
(unsigned long)(&__image_begin);
puts("zimage at: ");
puthex(zimage_start);
puts(" ");
puthex(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 */
puts("Uncompressing Linux at load address ");
puthex(VMLINUX_LOAD_ADDRESS_ULL);
puts("\n");
/* Decompress the kernel with according algorithm */
__decompress((char *)zimage_start, zimage_size, 0, 0,
(void *)VMLINUX_LOAD_ADDRESS_ULL, 0, 0, error);
if (IS_ENABLED(CONFIG_MIPS_RAW_APPENDED_DTB) &&
fdt_magic((void *)&__appended_dtb) == FDT_MAGIC) {
unsigned int image_size, dtb_size;
dtb_size = fdt_totalsize((void *)&__appended_dtb);
/* last four bytes is always image size in little endian */
image_size = le32_to_cpup((void *)&__image_end - 4);
/* copy dtb to where the booted kernel will expect it */
memcpy((void *)VMLINUX_LOAD_ADDRESS_ULL + image_size,
__appended_dtb, dtb_size);
}
/* FIXME: should we flush cache here? */
puts("Now, booting the kernel...\n");
}
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