arch/sh/boot/compressed/misc.c

   1 /*
   2  * arch/sh/boot/compressed/misc.c
   3  *
   4  * This is a collection of several routines from gzip-1.0.3
   5  * adapted for Linux.
   6  *
   7  * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
   8  *
   9  * Adapted for SH by Stuart Menefy, Aug 1999
  10  *
  11  * Modified to use standard LinuxSH BIOS by Greg Banks 7Jul2000
  12  */
  13
  14 #include <asm/uaccess.h>
  15 #include <asm/addrspace.h>
  16 #include <asm/page.h>
  17
  18 /*
  19  * gzip declarations
  20  */
  21
  22 #define STATIC static
  23
  24 #undef memset
  25 #undef memcpy
  26 #define memzero(s, n)     memset ((s), 0, (n))
  27
  28 /* cache.c */
  29 #define CACHE_ENABLE      0
  30 #define CACHE_DISABLE     1
  31 int cache_control(unsigned int command);
  32
  33 extern char input_data[];
  34 extern int input_len;
  35 static unsigned char *output;
  36
  37 static void error(char *m);
  38
  39 int puts(const char *);
  40
  41 extern int _text;               /* Defined in vmlinux.lds.S */
  42 extern int _end;
  43 static unsigned long free_mem_ptr;
  44 static unsigned long free_mem_end_ptr;
  45
  46 #ifdef CONFIG_HAVE_KERNEL_BZIP2
  47 #define HEAP_SIZE       0x400000
  48 #else
  49 #define HEAP_SIZE       0x10000
  50 #endif
  51
  52 #ifdef CONFIG_KERNEL_GZIP
  53 #include "../../../../lib/decompress_inflate.c"
  54 #endif
  55
  56 #ifdef CONFIG_KERNEL_BZIP2
  57 #include "../../../../lib/decompress_bunzip2.c"
  58 #endif
  59
  60 #ifdef CONFIG_KERNEL_LZMA
  61 #include "../../../../lib/decompress_unlzma.c"
  62 #endif
  63
  64 #ifdef CONFIG_KERNEL_XZ
  65 #include "../../../../lib/decompress_unxz.c"
  66 #endif
  67
  68 #ifdef CONFIG_KERNEL_LZO
  69 #include "../../../../lib/decompress_unlzo.c"
  70 #endif
  71
  72 int puts(const char *s)
  73 {
  74         /* This should be updated to use the sh-sci routines */
  75         return 0;
  76 }
  77
  78 void* memset(void* s, int c, size_t n)
  79 {
  80         int i;
  81         char *ss = (char*)s;
  82
  83         for (i=0;i<n;i++) ss[i] = c;
  84         return s;
  85 }
  86
  87 void* memcpy(void* __dest, __const void* __src,
  88                             size_t __n)
  89 {
  90         int i;
  91         char *d = (char *)__dest, *s = (char *)__src;
  92
  93         for (i=0;i<__n;i++) d[i] = s[i];
  94         return __dest;
  95 }
  96
  97 static void error(char *x)
  98 {
  99         puts("\n\n");
 100         puts(x);
 101         puts("\n\n -- System halted");
 102
 103         while(1);       /* Halt */
 104 }
 105
 106 #ifdef CONFIG_SUPERH64
 107 #define stackalign      8
 108 #else
 109 #define stackalign      4
 110 #endif
 111
 112 #define STACK_SIZE (4096)
 113 long __attribute__ ((aligned(stackalign))) user_stack[STACK_SIZE];
 114 long *stack_start = &user_stack[STACK_SIZE];
 115
 116 void decompress_kernel(void)
 117 {
 118         unsigned long output_addr;
 119
 120 #ifdef CONFIG_SUPERH64
 121         output_addr = (CONFIG_MEMORY_START + 0x2000);
 122 #else
 123         output_addr = __pa((unsigned long)&_text+PAGE_SIZE);
 124 #if defined(CONFIG_29BIT)
 125         output_addr |= P2SEG;
 126 #endif
 127 #endif
 128
 129         output = (unsigned char *)output_addr;
 130         free_mem_ptr = (unsigned long)&_end;
 131         free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
 132
 133         puts("Uncompressing Linux... ");
 134         cache_control(CACHE_ENABLE);
 135         decompress(input_data, input_len, NULL, NULL, output, NULL, error);
 136         cache_control(CACHE_DISABLE);
 137         puts("Ok, booting the kernel.\n");
 138 }