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 #include "../../../../lib/decompress_inflate.c"
  48 #endif
  49
  50 #ifdef CONFIG_KERNEL_BZIP2
  51 #include "../../../../lib/decompress_bunzip2.c"
  52 #endif
  53
  54 #ifdef CONFIG_KERNEL_LZ4
  55 #include "../../../../lib/decompress_unlz4.c"
  56 #endif
  57
  58 #ifdef CONFIG_KERNEL_LZMA
  59 #include "../../../../lib/decompress_unlzma.c"
  60 #endif
  61
  62 #ifdef CONFIG_KERNEL_LZO
  63 #include "../../../../lib/decompress_unlzo.c"
  64 #endif
  65
  66 #ifdef CONFIG_KERNEL_XZ
  67 #include "../../../../lib/decompress_unxz.c"
  68 #endif
  69
  70 void decompress_kernel(unsigned long boot_heap_start)
  71 {
  72         unsigned long zimage_start, zimage_size;
  73
  74         zimage_start = (unsigned long)(&__image_begin);
  75         zimage_size = (unsigned long)(&__image_end) -
  76             (unsigned long)(&__image_begin);
  77
  78         puts("zimage at:     ");
  79         puthex(zimage_start);
  80         puts(" ");
  81         puthex(zimage_size + zimage_start);
  82         puts("\n");
  83
  84         /* This area are prepared for mallocing when decompressing */
  85         free_mem_ptr = boot_heap_start;
  86         free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE;
  87
  88         /* Display standard Linux/MIPS boot prompt */
  89         puts("Uncompressing Linux at load address ");
  90         puthex(VMLINUX_LOAD_ADDRESS_ULL);
  91         puts("\n");
  92
  93         /* Decompress the kernel with according algorithm */
  94         decompress((char *)zimage_start, zimage_size, 0, 0,
  95                    (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, error);
  96
  97         /* FIXME: should we flush cache here? */
  98         puts("Now, booting the kernel...\n");
  99 }