2 * Misc. bootloader code for many machines.
4 * Copyright 2001 MontaVista Software Inc.
5 * Author: Matt Porter <mporter@mvista.com> Derived from
6 * arch/ppc/boot/prep/misc.c
8 * Copyright (C) 2009 Lemote, Inc. & Institute of Computing Technology
9 * Author: Wu Zhangjin <wuzj@lemote.com>
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the
13 * Free Software Foundation; either version 2 of the License, or (at your
14 * option) any later version.
17 #include <linux/types.h>
18 #include <linux/kernel.h>
20 #include <asm/addrspace.h>
22 /* These two variables specify the free mem region
23 * that can be used for temporary malloc area
25 unsigned long free_mem_ptr;
26 unsigned long free_mem_end_ptr;
29 /* The linker tells us where the image is. */
30 extern unsigned char __image_begin, __image_end;
32 /* debug interfaces */
33 extern void puts(const char *s);
34 extern void puthex(unsigned long long val);
40 puts("\n\n -- System halted");
46 /* activate the code for pre-boot environment */
49 #ifdef CONFIG_KERNEL_GZIP
50 void *memcpy(void *dest, const void *src, size_t n)
56 for (i = 0; i < n; i++)
60 #include "../../../../lib/decompress_inflate.c"
63 #ifdef CONFIG_KERNEL_BZIP2
64 void *memset(void *s, int c, size_t n)
69 for (i = 0; i < n; i++)
73 #include "../../../../lib/decompress_bunzip2.c"
76 #ifdef CONFIG_KERNEL_LZMA
77 #include "../../../../lib/decompress_unlzma.c"
80 void decompress_kernel(unsigned long boot_heap_start)
85 * We link ourself to an arbitrary low address. When we run, we
86 * relocate outself to that address. __image_beign points to
87 * the part of the image where the zImage is. -- Tom
89 zimage_start = (char *)(unsigned long)(&__image_begin);
90 zimage_size = (unsigned long)(&__image_end) -
91 (unsigned long)(&__image_begin);
94 * The zImage and initrd will be between start and _end, so they've
95 * already been moved once. We're good to go now. -- Tom
98 puthex((unsigned long)zimage_start);
100 puthex((unsigned long)(zimage_size + zimage_start));
103 /* this area are prepared for mallocing when decompressing */
104 free_mem_ptr = boot_heap_start;
105 free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE;
107 /* Display standard Linux/MIPS boot prompt for kernel args */
108 puts("Uncompressing Linux at load address ");
109 puthex(VMLINUX_LOAD_ADDRESS_ULL);
111 /* Decompress the kernel with according algorithm */
112 decompress(zimage_start, zimage_size, 0, 0,
113 (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, error);
114 /* FIXME: is there a need to flush cache here? */
115 puts("Now, booting the kernel...\n");