arch/m32r/boot/compressed/misc.c

   1 /*
   2  * arch/m32r/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  * 2003-02-12:  Support M32R by Takeo Takahashi
  12  *              This is based on arch/sh/boot/compressed/misc.c.
  13  */
  14
  15 #include <linux/config.h>
  16 #include <linux/string.h>
  17
  18 /*
  19  * gzip declarations
  20  */
  21
  22 #define OF(args)  args
  23 #define STATIC static
  24
  25 #undef memset
  26 #undef memcpy
  27 #define memzero(s, n)     memset ((s), 0, (n))
  28
  29 typedef unsigned char  uch;
  30 typedef unsigned short ush;
  31 typedef unsigned long  ulg;
  32
  33 #define WSIZE 0x8000            /* Window size must be at least 32k, */
  34                                 /* and a power of two */
  35
  36 static uch *inbuf;           /* input buffer */
  37 static uch window[WSIZE];    /* Sliding window buffer */
  38
  39 static unsigned insize = 0;  /* valid bytes in inbuf */
  40 static unsigned inptr = 0;   /* index of next byte to be processed in inbuf */
  41 static unsigned outcnt = 0;  /* bytes in output buffer */
  42
  43 /* gzip flag byte */
  44 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ASCII text */
  45 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
  46 #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
  47 #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
  48 #define COMMENT      0x10 /* bit 4 set: file comment present */
  49 #define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
  50 #define RESERVED     0xC0 /* bit 6,7:   reserved */
  51
  52 #define get_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf())
  53
  54 /* Diagnostic functions */
  55 #ifdef DEBUG
  56 #  define Assert(cond,msg) {if(!(cond)) error(msg);}
  57 #  define Trace(x) fprintf x
  58 #  define Tracev(x) {if (verbose) fprintf x ;}
  59 #  define Tracevv(x) {if (verbose>1) fprintf x ;}
  60 #  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
  61 #  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
  62 #else
  63 #  define Assert(cond,msg)
  64 #  define Trace(x)
  65 #  define Tracev(x)
  66 #  define Tracevv(x)
  67 #  define Tracec(c,x)
  68 #  define Tracecv(c,x)
  69 #endif
  70
  71 static int  fill_inbuf(void);
  72 static void flush_window(void);
  73 static void error(char *m);
  74 static void gzip_mark(void **);
  75 static void gzip_release(void **);
  76
  77 static unsigned char *input_data;
  78 static int input_len;
  79
  80 static long bytes_out = 0;
  81 static uch *output_data;
  82 static unsigned long output_ptr = 0;
  83
  84 #include "m32r_sio.c"
  85
  86 static void *malloc(int size);
  87 static void free(void *where);
  88
  89 static unsigned long free_mem_ptr;
  90 static unsigned long free_mem_end_ptr;
  91
  92 #define HEAP_SIZE             0x10000
  93
  94 #include "../../../../lib/inflate.c"
  95
  96 static void *malloc(int size)
  97 {
  98         void *p;
  99
 100         if (size <0) error("Malloc error");
 101         if (free_mem_ptr == 0) error("Memory error");
 102
 103         free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
 104
 105         p = (void *)free_mem_ptr;
 106         free_mem_ptr += size;
 107
 108         if (free_mem_ptr >= free_mem_end_ptr)
 109                 error("Out of memory");
 110
 111         return p;
 112 }
 113
 114 static void free(void *where)
 115 {       /* Don't care */
 116 }
 117
 118 static void gzip_mark(void **ptr)
 119 {
 120         *ptr = (void *) free_mem_ptr;
 121 }
 122
 123 static void gzip_release(void **ptr)
 124 {
 125         free_mem_ptr = (long) *ptr;
 126 }
 127
 128 void* memset(void* s, int c, size_t n)
 129 {
 130         int i;
 131         char *ss = (char*)s;
 132
 133         for (i=0;i<n;i++) ss[i] = c;
 134         return s;
 135 }
 136
 137 void* memcpy(void* __dest, __const void* __src,
 138                             size_t __n)
 139 {
 140         int i;
 141         char *d = (char *)__dest, *s = (char *)__src;
 142
 143         for (i=0;i<__n;i++) d[i] = s[i];
 144         return __dest;
 145 }
 146
 147 /* ===========================================================================
 148  * Fill the input buffer. This is called only when the buffer is empty
 149  * and at least one byte is really needed.
 150  */
 151 static int fill_inbuf(void)
 152 {
 153         if (insize != 0) {
 154                 error("ran out of input data");
 155         }
 156
 157         inbuf = input_data;
 158         insize = input_len;
 159         inptr = 1;
 160         return inbuf[0];
 161 }
 162
 163 /* ===========================================================================
 164  * Write the output window window[0..outcnt-1] and update crc and bytes_out.
 165  * (Used for the decompressed data only.)
 166  */
 167 static void flush_window(void)
 168 {
 169     ulg c = crc;         /* temporary variable */
 170     unsigned n;
 171     uch *in, *out, ch;
 172
 173     in = window;
 174     out = &output_data[output_ptr];
 175     for (n = 0; n < outcnt; n++) {
 176             ch = *out++ = *in++;
 177             c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
 178     }
 179     crc = c;
 180     bytes_out += (ulg)outcnt;
 181     output_ptr += (ulg)outcnt;
 182     outcnt = 0;
 183 }
 184
 185 static void error(char *x)
 186 {
 187         puts("\n\n");
 188         puts(x);
 189         puts("\n\n -- System halted");
 190
 191         while(1);       /* Halt */
 192 }
 193
 194 /* return decompressed size */
 195 void
 196 decompress_kernel(int mmu_on, unsigned char *zimage_data,
 197                   unsigned int zimage_len, unsigned long heap)
 198 {
 199         output_data = (unsigned char *)CONFIG_MEMORY_START + 0x2000
 200                 + (mmu_on ? 0x80000000 : 0);
 201         free_mem_ptr = heap;
 202         free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
 203         input_data = zimage_data;
 204         input_len = zimage_len;
 205
 206         makecrc();
 207         puts("Uncompressing Linux... ");
 208         gunzip();
 209         puts("Ok, booting the kernel.\n");
 210 }