target/linux/xburst/files-2.6.32/arch/mips/boot/compressed/misc.c

   1 /*
   2  * linux/arch/mips/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 JZSOC by Peter Wei, 2008
  10  *
  11  */
  12
  13 #define size_t  int
  14 #define NULL 0
  15
  16 /*
  17  * gzip declarations
  18  */
  19
  20 #define OF(args)  args
  21 #define STATIC static
  22
  23 #undef memset
  24 #undef memcpy
  25 #define memzero(s, n)     memset ((s), 0, (n))
  26
  27 typedef unsigned char  uch;
  28 typedef unsigned short ush;
  29 typedef unsigned long  ulg;
  30
  31 #define WSIZE 0x8000            /* Window size must be at least 32k, */
  32                                 /* and a power of two */
  33
  34 static uch *inbuf;           /* input buffer */
  35 static uch window[WSIZE];    /* Sliding window buffer */
  36
  37 static unsigned insize = 0;  /* valid bytes in inbuf */
  38 static unsigned inptr = 0;   /* index of next byte to be processed in inbuf */
  39 static unsigned outcnt = 0;  /* bytes in output buffer */
  40
  41 /* gzip flag byte */
  42 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ASCII text */
  43 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
  44 #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
  45 #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
  46 #define COMMENT      0x10 /* bit 4 set: file comment present */
  47 #define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
  48 #define RESERVED     0xC0 /* bit 6,7:   reserved */
  49
  50 #define get_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf())
  51
  52 /* Diagnostic functions */
  53 #ifdef DEBUG
  54 #  define Assert(cond,msg) {if(!(cond)) error(msg);}
  55 #  define Trace(x) fprintf x
  56 #  define Tracev(x) {if (verbose) fprintf x ;}
  57 #  define Tracevv(x) {if (verbose>1) fprintf x ;}
  58 #  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
  59 #  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
  60 #else
  61 #  define Assert(cond,msg)
  62 #  define Trace(x)
  63 #  define Tracev(x)
  64 #  define Tracevv(x)
  65 #  define Tracec(c,x)
  66 #  define Tracecv(c,x)
  67 #endif
  68
  69 static int  fill_inbuf(void);
  70 static void flush_window(void);
  71 static void error(char *m);
  72 static void gzip_mark(void **);
  73 static void gzip_release(void **);
  74
  75 void* memset(void* s, int c, size_t n);
  76 void* memcpy(void* __dest, __const void* __src, size_t __n);
  77
  78 extern void flushcaches(void); /* defined in head.S */
  79
  80 char *input_data;
  81 int input_len;
  82
  83 static long bytes_out = 0;
  84 static uch *output_data;
  85 static unsigned long output_ptr = 0;
  86
  87
  88 static void *malloc(int size);
  89 static void free(void *where);
  90 static void error(char *m);
  91 static void gzip_mark(void **);
  92 static void gzip_release(void **);
  93
  94 static void puts(const char *str)
  95 {
  96 }
  97
  98 extern unsigned char _end[];
  99 static unsigned long free_mem_ptr;
 100 static unsigned long free_mem_end_ptr;
 101
 102 #define HEAP_SIZE             0x10000
 103
 104 #include "../../../../lib/inflate.c"
 105
 106 static void *malloc(int size)
 107 {
 108         void *p;
 109
 110         if (size <0) error("Malloc error\n");
 111         if (free_mem_ptr == 0) error("Memory error\n");
 112
 113         free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
 114
 115         p = (void *)free_mem_ptr;
 116         free_mem_ptr += size;
 117
 118         if (free_mem_ptr >= free_mem_end_ptr)
 119                 error("\nOut of memory\n");
 120
 121         return p;
 122 }
 123
 124 static void free(void *where)
 125 {       /* Don't care */
 126 }
 127
 128 static void gzip_mark(void **ptr)
 129 {
 130         *ptr = (void *) free_mem_ptr;
 131 }
 132
 133 static void gzip_release(void **ptr)
 134 {
 135         free_mem_ptr = (long) *ptr;
 136 }
 137
 138 void* memset(void* s, int c, size_t n)
 139 {
 140         int i;
 141         char *ss = (char*)s;
 142
 143         for (i=0;i<n;i++) ss[i] = c;
 144         return s;
 145 }
 146
 147 void* memcpy(void* __dest, __const void* __src, size_t __n)
 148 {
 149         int i = 0;
 150         unsigned char *d = (unsigned char *)__dest, *s = (unsigned char *)__src;
 151
 152         for (i = __n >> 3; i > 0; i--) {
 153                 *d++ = *s++;
 154                 *d++ = *s++;
 155                 *d++ = *s++;
 156                 *d++ = *s++;
 157                 *d++ = *s++;
 158                 *d++ = *s++;
 159                 *d++ = *s++;
 160                 *d++ = *s++;
 161         }
 162
 163         if (__n & 1 << 2) {
 164                 *d++ = *s++;
 165                 *d++ = *s++;
 166                 *d++ = *s++;
 167                 *d++ = *s++;
 168         }
 169
 170         if (__n & 1 << 1) {
 171                 *d++ = *s++;
 172                 *d++ = *s++;
 173         }
 174
 175         if (__n & 1)
 176                 *d++ = *s++;
 177
 178         return __dest;
 179 }
 180
 181 /* ===========================================================================
 182  * Fill the input buffer. This is called only when the buffer is empty
 183  * and at least one byte is really needed.
 184  */
 185 static int fill_inbuf(void)
 186 {
 187         if (insize != 0) {
 188                 error("ran out of input data\n");
 189         }
 190
 191         inbuf = input_data;
 192         insize = input_len;
 193         inptr = 1;
 194         return inbuf[0];
 195 }
 196
 197 /* ===========================================================================
 198  * Write the output window window[0..outcnt-1] and update crc and bytes_out.
 199  * (Used for the decompressed data only.)
 200  */
 201 static void flush_window(void)
 202 {
 203     ulg c = crc;         /* temporary variable */
 204     unsigned n;
 205     uch *in, *out, ch;
 206
 207     in = window;
 208     out = &output_data[output_ptr];
 209     for (n = 0; n < outcnt; n++) {
 210             ch = *out++ = *in++;
 211             c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
 212     }
 213     crc = c;
 214     bytes_out += (ulg)outcnt;
 215     output_ptr += (ulg)outcnt;
 216     outcnt = 0;
 217 }
 218
 219 static void error(char *x)
 220 {
 221         puts("\n\n");
 222         puts(x);
 223         puts("\n\n -- System halted");
 224
 225         while(1);       /* Halt */
 226 }
 227
 228 void decompress_kernel(unsigned int imageaddr, unsigned int imagesize, unsigned int loadaddr)
 229 {
 230         input_data = (char *)imageaddr;
 231         input_len = imagesize;
 232         output_ptr = 0;
 233         output_data = (uch *)loadaddr;
 234         free_mem_ptr = (unsigned long)_end;
 235         free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
 236
 237         makecrc();
 238         puts("Uncompressing Linux...");
 239         gunzip();
 240         flushcaches();
 241         puts("Ok, booting the kernel.");
 242 }