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/string.h>
  16
  17 /*
  18  * gzip declarations
  19  */
  20
  21 #define OF(args)  args
  22 #define STATIC static
  23
  24 #undef memset
  25 #undef memcpy
  26 #define memzero(s, n)     memset ((s), 0, (n))
  27
  28 typedef unsigned char  uch;
  29 typedef unsigned short ush;
  30 typedef unsigned long  ulg;
  31
  32 #define WSIZE 0x8000            /* Window size must be at least 32k, */
  33                                 /* and a power of two */
  34
  35 static uch *inbuf;           /* input buffer */
  36 static uch window[WSIZE];    /* Sliding window buffer */
  37
  38 static unsigned insize = 0;  /* valid bytes in inbuf */
  39 static unsigned inptr = 0;   /* index of next byte to be processed in inbuf */
  40 static unsigned outcnt = 0;  /* bytes in output buffer */
  41
  42 /* gzip flag byte */
  43 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ASCII text */
  44 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
  45 #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
  46 #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
  47 #define COMMENT      0x10 /* bit 4 set: file comment present */
  48 #define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
  49 #define RESERVED     0xC0 /* bit 6,7:   reserved */
  50
  51 #define get_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf())
  52
  53 /* Diagnostic functions */
  54 #ifdef DEBUG
  55 #  define Assert(cond,msg) {if(!(cond)) error(msg);}
  56 #  define Trace(x) fprintf x
  57 #  define Tracev(x) {if (verbose) fprintf x ;}
  58 #  define Tracevv(x) {if (verbose>1) fprintf x ;}
  59 #  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
  60 #  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
  61 #else
  62 #  define Assert(cond,msg)
  63 #  define Trace(x)
  64 #  define Tracev(x)
  65 #  define Tracevv(x)
  66 #  define Tracec(c,x)
  67 #  define Tracecv(c,x)
  68 #endif
  69
  70 static int  fill_inbuf(void);
  71 static void flush_window(void);
  72 static void error(char *m);
  73
  74 static unsigned char *input_data;
  75 static int input_len;
  76
  77 static long bytes_out = 0;
  78 static uch *output_data;
  79 static unsigned long output_ptr = 0;
  80
  81 #include "m32r_sio.c"
  82
  83 static unsigned long free_mem_ptr;
  84 static unsigned long free_mem_end_ptr;
  85
  86 #define HEAP_SIZE             0x10000
  87
  88 #include "../../../../lib/inflate.c"
  89
  90 void* memset(void* s, int c, size_t n)
  91 {
  92         int i;
  93         char *ss = (char*)s;
  94
  95         for (i=0;i<n;i++) ss[i] = c;
  96         return s;
  97 }
  98
  99 void* memcpy(void* __dest, __const void* __src,
 100                             size_t __n)
 101 {
 102         int i;
 103         char *d = (char *)__dest, *s = (char *)__src;
 104
 105         for (i=0;i<__n;i++) d[i] = s[i];
 106         return __dest;
 107 }
 108
 109 /* ===========================================================================
 110  * Fill the input buffer. This is called only when the buffer is empty
 111  * and at least one byte is really needed.
 112  */
 113 static int fill_inbuf(void)
 114 {
 115         if (insize != 0) {
 116                 error("ran out of input data");
 117         }
 118
 119         inbuf = input_data;
 120         insize = input_len;
 121         inptr = 1;
 122         return inbuf[0];
 123 }
 124
 125 /* ===========================================================================
 126  * Write the output window window[0..outcnt-1] and update crc and bytes_out.
 127  * (Used for the decompressed data only.)
 128  */
 129 static void flush_window(void)
 130 {
 131     ulg c = crc;         /* temporary variable */
 132     unsigned n;
 133     uch *in, *out, ch;
 134
 135     in = window;
 136     out = &output_data[output_ptr];
 137     for (n = 0; n < outcnt; n++) {
 138             ch = *out++ = *in++;
 139             c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
 140     }
 141     crc = c;
 142     bytes_out += (ulg)outcnt;
 143     output_ptr += (ulg)outcnt;
 144     outcnt = 0;
 145 }
 146
 147 static void error(char *x)
 148 {
 149         puts("\n\n");
 150         puts(x);
 151         puts("\n\n -- System halted");
 152
 153         while(1);       /* Halt */
 154 }
 155
 156 /* return decompressed size */
 157 void
 158 decompress_kernel(int mmu_on, unsigned char *zimage_data,
 159                   unsigned int zimage_len, unsigned long heap)
 160 {
 161         output_data = (unsigned char *)CONFIG_MEMORY_START + 0x2000
 162                 + (mmu_on ? 0x80000000 : 0);
 163         free_mem_ptr = heap;
 164         free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
 165         input_data = zimage_data;
 166         input_len = zimage_len;
 167
 168         makecrc();
 169         puts("Uncompressing Linux... ");
 170         gunzip();
 171         puts("Ok, booting the kernel.\n");
 172 }