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Diffstat (limited to 'arch/mips/boot/compressed/decompress.c')
| -rw-r--r-- | arch/mips/boot/compressed/decompress.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/arch/mips/boot/compressed/decompress.c b/arch/mips/boot/compressed/decompress.c new file mode 100644 index 0000000..67330c2 --- /dev/null +++ b/arch/mips/boot/compressed/decompress.c @@ -0,0 +1,126 @@ +/* + * 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. & Institute of Computing Technology + * Author: Wu Zhangjin <wuzj@lemote.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; +extern unsigned char __ramdisk_begin, __ramdisk_end; +unsigned long initrd_size; + +/* 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 + +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"); + + if (initrd_size) { + puts("initrd at: "); + puthex((unsigned long)(&__ramdisk_begin)); + puts(" "); + puthex((unsigned long)(&__ramdisk_end)); + 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"); +} |