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 #ifdef CONFIG_SH_STANDARD_BIOS
  16 #include <asm/sh_bios.h>
  17 #endif
  18
  19 /*
  20  * gzip declarations
  21  */
  22
  23 #define OF(args)  args
  24 #define STATIC static
  25
  26 #undef memset
  27 #undef memcpy
  28 #define memzero(s, n)     memset ((s), 0, (n))
  29
  30 typedef unsigned char  uch;
  31 typedef unsigned short ush;
  32 typedef unsigned long  ulg;
  33
  34 #define WSIZE 0x8000            /* Window size must be at least 32k, */
  35                                 /* and a power of two */
  36
  37 static uch *inbuf;           /* input buffer */
  38 static uch window[WSIZE];    /* Sliding window buffer */
  39
  40 static unsigned insize = 0;  /* valid bytes in inbuf */
  41 static unsigned inptr = 0;   /* index of next byte to be processed in inbuf */
  42 static unsigned outcnt = 0;  /* bytes in output buffer */
  43
  44 /* gzip flag byte */
  45 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ASCII text */
  46 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
  47 #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
  48 #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
  49 #define COMMENT      0x10 /* bit 4 set: file comment present */
  50 #define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
  51 #define RESERVED     0xC0 /* bit 6,7:   reserved */
  52
  53 #define get_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf())
  54
  55 /* Diagnostic functions */
  56 #ifdef DEBUG
  57 #  define Assert(cond,msg) {if(!(cond)) error(msg);}
  58 #  define Trace(x) fprintf x
  59 #  define Tracev(x) {if (verbose) fprintf x ;}
  60 #  define Tracevv(x) {if (verbose>1) fprintf x ;}
  61 #  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
  62 #  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
  63 #else
  64 #  define Assert(cond,msg)
  65 #  define Trace(x)
  66 #  define Tracev(x)
  67 #  define Tracevv(x)
  68 #  define Tracec(c,x)
  69 #  define Tracecv(c,x)
  70 #endif
  71
  72 static int  fill_inbuf(void);
  73 static void flush_window(void);
  74 static void error(char *m);
  75 static void gzip_mark(void **);
  76 static void gzip_release(void **);
  77
  78 extern char input_data[];
  79 extern int input_len;
  80
  81 static long bytes_out = 0;
  82 static uch *output_data;
  83 static unsigned long output_ptr = 0;
  84
  85 static void *malloc(int size);
  86 static void free(void *where);
  87 static void error(char *m);
  88 static void gzip_mark(void **);
  89 static void gzip_release(void **);
  90
  91 int puts(const char *);
  92
  93 extern int _text;               /* Defined in vmlinux.lds.S */
  94 extern int _end;
  95 static unsigned long free_mem_ptr;
  96 static unsigned long free_mem_end_ptr;
  97
  98 #define HEAP_SIZE             0x10000
  99
 100 #include "../../../../lib/inflate.c"
 101
 102 static void *malloc(int size)
 103 {
 104         void *p;
 105
 106         if (size <0) error("Malloc error");
 107         if (free_mem_ptr == 0) error("Memory error");
 108
 109         free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
 110
 111         p = (void *)free_mem_ptr;
 112         free_mem_ptr += size;
 113
 114         if (free_mem_ptr >= free_mem_end_ptr)
 115                 error("Out of memory");
 116
 117         return p;
 118 }
 119
 120 static void free(void *where)
 121 {       /* Don't care */
 122 }
 123
 124 static void gzip_mark(void **ptr)
 125 {
 126         *ptr = (void *) free_mem_ptr;
 127 }
 128
 129 static void gzip_release(void **ptr)
 130 {
 131         free_mem_ptr = (long) *ptr;
 132 }
 133
 134 #ifdef CONFIG_SH_STANDARD_BIOS
 135 size_t strlen(const char *s)
 136 {
 137         int i = 0;
 138
 139         while (*s++)
 140                 i++;
 141         return i;
 142 }
 143
 144 int puts(const char *s)
 145 {
 146         int len = strlen(s);
 147         sh_bios_console_write(s, len);
 148         return len;
 149 }
 150 #else
 151 int puts(const char *s)
 152 {
 153         /* This should be updated to use the sh-sci routines */
 154         return 0;
 155 }
 156 #endif
 157
 158 void* memset(void* s, int c, size_t n)
 159 {
 160         int i;
 161         char *ss = (char*)s;
 162
 163         for (i=0;i<n;i++) ss[i] = c;
 164         return s;
 165 }
 166
 167 void* memcpy(void* __dest, __const void* __src,
 168                             size_t __n)
 169 {
 170         int i;
 171         char *d = (char *)__dest, *s = (char *)__src;
 172
 173         for (i=0;i<__n;i++) d[i] = s[i];
 174         return __dest;
 175 }
 176
 177 /* ===========================================================================
 178  * Fill the input buffer. This is called only when the buffer is empty
 179  * and at least one byte is really needed.
 180  */
 181 static int fill_inbuf(void)
 182 {
 183         if (insize != 0) {
 184                 error("ran out of input data");
 185         }
 186
 187         inbuf = input_data;
 188         insize = input_len;
 189         inptr = 1;
 190         return inbuf[0];
 191 }
 192
 193 /* ===========================================================================
 194  * Write the output window window[0..outcnt-1] and update crc and bytes_out.
 195  * (Used for the decompressed data only.)
 196  */
 197 static void flush_window(void)
 198 {
 199     ulg c = crc;         /* temporary variable */
 200     unsigned n;
 201     uch *in, *out, ch;
 202
 203     in = window;
 204     out = &output_data[output_ptr];
 205     for (n = 0; n < outcnt; n++) {
 206             ch = *out++ = *in++;
 207             c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
 208     }
 209     crc = c;
 210     bytes_out += (ulg)outcnt;
 211     output_ptr += (ulg)outcnt;
 212     outcnt = 0;
 213 }
 214
 215 static void error(char *x)
 216 {
 217         puts("\n\n");
 218         puts(x);
 219         puts("\n\n -- System halted");
 220
 221         while(1);       /* Halt */
 222 }
 223
 224 #define STACK_SIZE (4096)
 225 long user_stack [STACK_SIZE];
 226 long* stack_start = &user_stack[STACK_SIZE];
 227
 228 void decompress_kernel(void)
 229 {
 230         output_data = 0;
 231         output_ptr = (unsigned long)&_text+0x20001000;
 232         free_mem_ptr = (unsigned long)&_end;
 233         free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
 234
 235         makecrc();
 236         puts("Uncompressing Linux... ");
 237         gunzip();
 238         puts("Ok, booting the kernel.\n");
 239 }