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_LZO
  65 #include "../../../../lib/decompress_unlzo.c"
  66 #endif
  67
  68 int puts(const char *s)
  69 {
  70         /* This should be updated to use the sh-sci routines */
  71         return 0;
  72 }
  73
  74 void* memset(void* s, int c, size_t n)
  75 {
  76         int i;
  77         char *ss = (char*)s;
  78
  79         for (i=0;i<n;i++) ss[i] = c;
  80         return s;
  81 }
  82
  83 void* memcpy(void* __dest, __const void* __src,
  84                             size_t __n)
  85 {
  86         int i;
  87         char *d = (char *)__dest, *s = (char *)__src;
  88
  89         for (i=0;i<__n;i++) d[i] = s[i];
  90         return __dest;
  91 }
  92
  93 static void error(char *x)
  94 {
  95         puts("\n\n");
  96         puts(x);
  97         puts("\n\n -- System halted");
  98
  99         while(1);       /* Halt */
 100 }
 101
 102 #ifdef CONFIG_SUPERH64
 103 #define stackalign      8
 104 #else
 105 #define stackalign      4
 106 #endif
 107
 108 #define STACK_SIZE (4096)
 109 long __attribute__ ((aligned(stackalign))) user_stack[STACK_SIZE];
 110 long *stack_start = &user_stack[STACK_SIZE];
 111
 112 void decompress_kernel(void)
 113 {
 114         unsigned long output_addr;
 115
 116 #ifdef CONFIG_SUPERH64
 117         output_addr = (CONFIG_MEMORY_START + 0x2000);
 118 #else
 119         output_addr = __pa((unsigned long)&_text+PAGE_SIZE);
 120 #if defined(CONFIG_29BIT)
 121         output_addr |= P2SEG;
 122 #endif
 123 #endif
 124
 125         output = (unsigned char *)output_addr;
 126         free_mem_ptr = (unsigned long)&_end;
 127         free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
 128
 129         puts("Uncompressing Linux... ");
 130         cache_control(CACHE_ENABLE);
 131         decompress(input_data, input_len, NULL, NULL, output, NULL, error);
 132         cache_control(CACHE_DISABLE);
 133         puts("Ok, booting the kernel.\n");
 134 }