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 #include <linux/types.h>
  15 #include <linux/kernel.h>
  16 #include <linux/string.h>
  17
  18 #include <asm/addrspace.h>
  19
  20 /*
  21  * These two variables specify the free mem region
  22  * that can be used for temporary malloc area
  23  */
  24 unsigned long free_mem_ptr;
  25 unsigned long free_mem_end_ptr;
  26
  27 /* The linker tells us where the image is. */
  28 extern unsigned char __image_begin, __image_end;
  29
  30 /* debug interfaces  */
  31 extern void puts(const char *s);
  32 extern void puthex(unsigned long long val);
  33
  34 void error(char *x)
  35 {
  36         puts("\n\n");
  37         puts(x);
  38         puts("\n\n -- System halted");
  39
  40         while (1)
  41                 ;       /* Halt */
  42 }
  43
  44 /* activate the code for pre-boot environment */
  45 #define STATIC static
  46
  47 #ifdef CONFIG_KERNEL_GZIP
  48 void *memcpy(void *dest, const void *src, size_t n)
  49 {
  50         int i;
  51         const char *s = src;
  52         char *d = dest;
  53
  54         for (i = 0; i < n; i++)
  55                 d[i] = s[i];
  56         return dest;
  57 }
  58 #include "../../../../lib/decompress_inflate.c"
  59 #endif
  60
  61 #ifdef CONFIG_KERNEL_BZIP2
  62 void *memset(void *s, int c, size_t n)
  63 {
  64         int i;
  65         char *ss = s;
  66
  67         for (i = 0; i < n; i++)
  68                 ss[i] = c;
  69         return s;
  70 }
  71 #include "../../../../lib/decompress_bunzip2.c"
  72 #endif
  73
  74 #ifdef CONFIG_KERNEL_LZMA
  75 #include "../../../../lib/decompress_unlzma.c"
  76 #endif
  77
  78 #ifdef CONFIG_KERNEL_LZO
  79 #include "../../../../lib/decompress_unlzo.c"
  80 #endif
  81
  82 void decompress_kernel(unsigned long boot_heap_start)
  83 {
  84         unsigned long zimage_start, zimage_size;
  85
  86         zimage_start = (unsigned long)(&__image_begin);
  87         zimage_size = (unsigned long)(&__image_end) -
  88             (unsigned long)(&__image_begin);
  89
  90         puts("zimage at:     ");
  91         puthex(zimage_start);
  92         puts(" ");
  93         puthex(zimage_size + zimage_start);
  94         puts("\n");
  95
  96         /* This area are prepared for mallocing when decompressing */
  97         free_mem_ptr = boot_heap_start;
  98         free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE;
  99
 100         /* Display standard Linux/MIPS boot prompt */
 101         puts("Uncompressing Linux at load address ");
 102         puthex(VMLINUX_LOAD_ADDRESS_ULL);
 103         puts("\n");
 104
 105         /* Decompress the kernel with according algorithm */
 106         decompress((char *)zimage_start, zimage_size, 0, 0,
 107                    (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, error);
 108
 109         /* FIXME: should we flush cache here? */
 110         puts("Now, booting the kernel...\n");
 111 }