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