arch/mips/boot/compressed/decompress.c

   1 /*
   2  * Copyright 2001 MontaVista Software Inc.
   3  * Author: Matt Porter <mporter@mvista.com>
   4  *
   5  * Copyright (C) 2009 Lemote, Inc.
   6  * Author: Wu Zhangjin <wuzhangjin@gmail.com>
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  */
  13
  14 #define DISABLE_BRANCH_PROFILING
  15
  16 #include <linux/types.h>
  17 #include <linux/kernel.h>
  18 #include <linux/string.h>
  19
  20 #include <asm/addrspace.h>
  21
  22 /*
  23  * These two variables specify the free mem region
  24  * that can be used for temporary malloc area
  25  */
  26 unsigned long free_mem_ptr;
  27 unsigned long free_mem_end_ptr;
  28
  29 /* The linker tells us where the image is. */
  30 extern unsigned char __image_begin, __image_end;
  31
  32 /* debug interfaces  */
  33 #ifdef CONFIG_DEBUG_ZBOOT
  34 extern void puts(const char *s);
  35 extern void puthex(unsigned long long val);
  36 #else
  37 #define puts(s) do {} while (0)
  38 #define puthex(val) do {} while (0)
  39 #endif
  40
  41 void error(char *x)
  42 {
  43         puts("\n\n");
  44         puts(x);
  45         puts("\n\n -- System halted");
  46
  47         while (1)
  48                 ;       /* Halt */
  49 }
  50
  51 /* activate the code for pre-boot environment */
  52 #define STATIC static
  53
  54 #ifdef CONFIG_KERNEL_GZIP
  55 #include "../../../../lib/decompress_inflate.c"
  56 #endif
  57
  58 #ifdef CONFIG_KERNEL_BZIP2
  59 #include "../../../../lib/decompress_bunzip2.c"
  60 #endif
  61
  62 #ifdef CONFIG_KERNEL_LZ4
  63 #include "../../../../lib/decompress_unlz4.c"
  64 #endif
  65
  66 #ifdef CONFIG_KERNEL_LZMA
  67 #include "../../../../lib/decompress_unlzma.c"
  68 #endif
  69
  70 #ifdef CONFIG_KERNEL_LZO
  71 #include "../../../../lib/decompress_unlzo.c"
  72 #endif
  73
  74 #ifdef CONFIG_KERNEL_XZ
  75 #include "../../../../lib/decompress_unxz.c"
  76 #endif
  77
  78 unsigned long __stack_chk_guard;
  79
  80 void __stack_chk_guard_setup(void)
  81 {
  82         __stack_chk_guard = 0x000a0dff;
  83 }
  84
  85 void __stack_chk_fail(void)
  86 {
  87         error("stack-protector: Kernel stack is corrupted\n");
  88 }
  89
  90 void decompress_kernel(unsigned long boot_heap_start)
  91 {
  92         unsigned long zimage_start, zimage_size;
  93
  94         __stack_chk_guard_setup();
  95
  96         zimage_start = (unsigned long)(&__image_begin);
  97         zimage_size = (unsigned long)(&__image_end) -
  98             (unsigned long)(&__image_begin);
  99
 100         puts("zimage at:     ");
 101         puthex(zimage_start);
 102         puts(" ");
 103         puthex(zimage_size + zimage_start);
 104         puts("\n");
 105
 106         /* This area are prepared for mallocing when decompressing */
 107         free_mem_ptr = boot_heap_start;
 108         free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE;
 109
 110         /* Display standard Linux/MIPS boot prompt */
 111         puts("Uncompressing Linux at load address ");
 112         puthex(VMLINUX_LOAD_ADDRESS_ULL);
 113         puts("\n");
 114
 115         /* Decompress the kernel with according algorithm */
 116         __decompress((char *)zimage_start, zimage_size, 0, 0,
 117                    (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, 0, error);
 118
 119         /* FIXME: should we flush cache here? */
 120         puts("Now, booting the kernel...\n");
 121 }