arch/nios2nommu/boot/compressed/misc.c

   1 /*
   2  * arch/nios2nommu/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 <linux/string.h>
  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 extern char input_data[];
  76 extern int input_len;
  77
  78 static long bytes_out = 0;
  79 static uch *output_data;
  80 static unsigned long output_ptr = 0;
  81
  82 #include "nios2_sio.c"
  83
  84 static void *malloc(int size);
  85 static void free(void *where);
  86 static void error(char *m);
  87 static void gzip_mark(void **);
  88 static void gzip_release(void **);
  89
  90 int puts(const char *);
  91
  92 extern int _end;
  93 static unsigned long free_mem_ptr;
  94 static unsigned long free_mem_end_ptr;
  95
  96 #define HEAP_SIZE             0x10000
  97
  98 #include "../../../../lib/inflate.c"
  99
 100 static void *malloc(int size)
 101 {
 102         void *p;
 103
 104         if (size <0) error("Malloc error");
 105         if (free_mem_ptr == 0) error("Memory error");
 106
 107         free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
 108
 109         p = (void *)free_mem_ptr;
 110         free_mem_ptr += size;
 111
 112         if (free_mem_ptr >= free_mem_end_ptr)
 113                 error("Out of memory");
 114
 115         return p;
 116 }
 117
 118 static void free(void *where)
 119 {       /* Don't care */
 120 }
 121
 122 static void gzip_mark(void **ptr)
 123 {
 124         *ptr = (void *) free_mem_ptr;
 125 }
 126
 127 static void gzip_release(void **ptr)
 128 {
 129         free_mem_ptr = (long) *ptr;
 130 }
 131
 132 void* memset(void* s, int c, size_t n)
 133 {
 134         int i;
 135         char *ss = (char*)s;
 136
 137         for (i=0;i<n;i++) ss[i] = c;
 138         return s;
 139 }
 140
 141 void* memcpy(void* __dest, __const void* __src,
 142                             size_t __n)
 143 {
 144         int i;
 145         char *d = (char *)__dest, *s = (char *)__src;
 146
 147         for (i=0;i<__n;i++) d[i] = s[i];
 148         return __dest;
 149 }
 150
 151 /* ===========================================================================
 152  * Fill the input buffer. This is called only when the buffer is empty
 153  * and at least one byte is really needed.
 154  */
 155 static int fill_inbuf(void)
 156 {
 157         if (insize != 0) {
 158                 error("ran out of input data");
 159         }
 160
 161         inbuf = input_data;
 162         insize = input_len;
 163         inptr = 1;
 164         return inbuf[0];
 165 }
 166
 167 /* ===========================================================================
 168  * Write the output window window[0..outcnt-1] and update crc and bytes_out.
 169  * (Used for the decompressed data only.)
 170  */
 171 static void flush_window(void)
 172 {
 173     ulg c = crc;         /* temporary variable */
 174     unsigned n;
 175     uch *in, *out, ch;
 176     in = window;
 177     out = &output_data[output_ptr];
 178     for (n = 0; n < outcnt; n++) {
 179             ch = *out++ = *in++;
 180             c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
 181     }
 182     crc = c;
 183     bytes_out += (ulg)outcnt;
 184     output_ptr += (ulg)outcnt;
 185     outcnt = 0;
 186 }
 187
 188 static void error(char *x)
 189 {
 190         puts("\nERROR\n");
 191         puts(x);
 192         puts("\n\n -- System halted");
 193
 194         while(1);       /* Halt */
 195 }
 196
 197 void decompress_kernel(void)
 198 {
 199   output_data = (void *)nasys_program_mem;
 200   output_ptr = 0;
 201   free_mem_ptr = (unsigned long)&_end;
 202   free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
 203
 204   makecrc();
 205   puts("Uncompressing Linux... ");
 206   gunzip();
 207   puts("Ok, booting the kernel.\n");
 208 }