arch/unicore32/boot/compressed/misc.c

   1 /*
   2  * linux/arch/unicore32/boot/compressed/misc.c
   3  *
   4  * Code specific to PKUnity SoC and UniCore ISA
   5  *
   6  * Copyright (C) 2001-2010 GUAN Xue-tao
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <asm/unaligned.h>
  14 #include <mach/uncompress.h>
  15
  16 /*
  17  * gzip delarations
  18  */
  19 unsigned char *output_data;
  20 unsigned long output_ptr;
  21
  22 unsigned int free_mem_ptr;
  23 unsigned int free_mem_end_ptr;
  24
  25 #define STATIC static
  26 #define STATIC_RW_DATA  /* non-static please */
  27
  28 /*
  29  * arch-dependent implementations
  30  */
  31 #ifndef ARCH_HAVE_DECOMP_ERROR
  32 #define arch_decomp_error(x)
  33 #endif
  34
  35 #ifndef ARCH_HAVE_DECOMP_SETUP
  36 #define arch_decomp_setup()
  37 #endif
  38
  39 #ifndef ARCH_HAVE_DECOMP_PUTS
  40 #define arch_decomp_puts(p)
  41 #endif
  42
  43 void *memcpy(void *dest, const void *src, size_t n)
  44 {
  45         int i = 0;
  46         unsigned char *d = (unsigned char *)dest, *s = (unsigned char *)src;
  47
  48         for (i = n >> 3; i > 0; i--) {
  49                 *d++ = *s++;
  50                 *d++ = *s++;
  51                 *d++ = *s++;
  52                 *d++ = *s++;
  53                 *d++ = *s++;
  54                 *d++ = *s++;
  55                 *d++ = *s++;
  56                 *d++ = *s++;
  57         }
  58
  59         if (n & 1 << 2) {
  60                 *d++ = *s++;
  61                 *d++ = *s++;
  62                 *d++ = *s++;
  63                 *d++ = *s++;
  64         }
  65
  66         if (n & 1 << 1) {
  67                 *d++ = *s++;
  68                 *d++ = *s++;
  69         }
  70
  71         if (n & 1)
  72                 *d++ = *s++;
  73
  74         return dest;
  75 }
  76
  77 void error(char *x)
  78 {
  79         arch_decomp_puts("\n\n");
  80         arch_decomp_puts(x);
  81         arch_decomp_puts("\n\n -- System halted");
  82
  83         arch_decomp_error(x);
  84
  85         for (;;)
  86                 ; /* Halt */
  87 }
  88
  89 /* Heap size should be adjusted for different decompress method */
  90 #ifdef CONFIG_KERNEL_GZIP
  91 #include "../../../../lib/decompress_inflate.c"
  92 #endif
  93
  94 #ifdef CONFIG_KERNEL_BZIP2
  95 #include "../../../../lib/decompress_bunzip2.c"
  96 #endif
  97
  98 #ifdef CONFIG_KERNEL_LZO
  99 #include "../../../../lib/decompress_unlzo.c"
 100 #endif
 101
 102 #ifdef CONFIG_KERNEL_LZMA
 103 #include "../../../../lib/decompress_unlzma.c"
 104 #endif
 105
 106 unsigned long decompress_kernel(unsigned long output_start,
 107                 unsigned long free_mem_ptr_p,
 108                 unsigned long free_mem_ptr_end_p)
 109 {
 110         unsigned char *tmp;
 111
 112         output_data             = (unsigned char *)output_start;
 113         free_mem_ptr            = free_mem_ptr_p;
 114         free_mem_end_ptr        = free_mem_ptr_end_p;
 115
 116         arch_decomp_setup();
 117
 118         tmp = (unsigned char *) (((unsigned long)input_data_end) - 4);
 119         output_ptr = get_unaligned_le32(tmp);
 120
 121         arch_decomp_puts("Uncompressing Linux...");
 122         decompress(input_data, input_data_end - input_data, NULL, NULL,
 123                         output_data, NULL, error);
 124         arch_decomp_puts(" done, booting the kernel.\n");
 125         return output_ptr;
 126 }