arch/h8300/boot/compressed/misc.c

   1 /*
   2  * arch/h8300/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 h8300 by Yoshinori Sato 2006
  10  */
  11
  12 #include <asm/uaccess.h>
  13
  14 /*
  15  * gzip declarations
  16  */
  17
  18 #define OF(args)  args
  19 #define STATIC static
  20
  21 #undef memset
  22 #undef memcpy
  23 #define memzero(s, n)     memset ((s), 0, (n))
  24
  25 typedef unsigned char  uch;
  26 typedef unsigned short ush;
  27 typedef unsigned long  ulg;
  28
  29 #define WSIZE 0x8000            /* Window size must be at least 32k, */
  30                                 /* and a power of two */
  31
  32 static uch *inbuf;           /* input buffer */
  33 static uch window[WSIZE];    /* Sliding window buffer */
  34
  35 static unsigned insize = 0;  /* valid bytes in inbuf */
  36 static unsigned inptr = 0;   /* index of next byte to be processed in inbuf */
  37 static unsigned outcnt = 0;  /* bytes in output buffer */
  38
  39 /* gzip flag byte */
  40 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ASCII text */
  41 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
  42 #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
  43 #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
  44 #define COMMENT      0x10 /* bit 4 set: file comment present */
  45 #define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
  46 #define RESERVED     0xC0 /* bit 6,7:   reserved */
  47
  48 #define get_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf())
  49
  50 /* Diagnostic functions */
  51 #ifdef DEBUG
  52 #  define Assert(cond,msg) {if(!(cond)) error(msg);}
  53 #  define Trace(x) fprintf x
  54 #  define Tracev(x) {if (verbose) fprintf x ;}
  55 #  define Tracevv(x) {if (verbose>1) fprintf x ;}
  56 #  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
  57 #  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
  58 #else
  59 #  define Assert(cond,msg)
  60 #  define Trace(x)
  61 #  define Tracev(x)
  62 #  define Tracevv(x)
  63 #  define Tracec(c,x)
  64 #  define Tracecv(c,x)
  65 #endif
  66
  67 static int  fill_inbuf(void);
  68 static void flush_window(void);
  69 static void error(char *m);
  70
  71 extern char input_data[];
  72 extern int input_len;
  73
  74 static long bytes_out = 0;
  75 static uch *output_data;
  76 static unsigned long output_ptr = 0;
  77
  78 static void error(char *m);
  79
  80 int puts(const char *);
  81
  82 extern int _end;
  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 #define SCR *((volatile unsigned char *)0xffff8a)
  91 #define TDR *((volatile unsigned char *)0xffff8b)
  92 #define SSR *((volatile unsigned char *)0xffff8c)
  93
  94 int puts(const char *s)
  95 {
  96         return 0;
  97 }
  98
  99 void* memset(void* s, int c, size_t n)
 100 {
 101         int i;
 102         char *ss = (char*)s;
 103
 104         for (i=0;i<n;i++) ss[i] = c;
 105         return s;
 106 }
 107
 108 void* memcpy(void* __dest, __const void* __src,
 109                             size_t __n)
 110 {
 111         int i;
 112         char *d = (char *)__dest, *s = (char *)__src;
 113
 114         for (i=0;i<__n;i++) d[i] = s[i];
 115         return __dest;
 116 }
 117
 118 /* ===========================================================================
 119  * Fill the input buffer. This is called only when the buffer is empty
 120  * and at least one byte is really needed.
 121  */
 122 static int fill_inbuf(void)
 123 {
 124         if (insize != 0) {
 125                 error("ran out of input data");
 126         }
 127
 128         inbuf = input_data;
 129         insize = input_len;
 130         inptr = 1;
 131         return inbuf[0];
 132 }
 133
 134 /* ===========================================================================
 135  * Write the output window window[0..outcnt-1] and update crc and bytes_out.
 136  * (Used for the decompressed data only.)
 137  */
 138 static void flush_window(void)
 139 {
 140     ulg c = crc;         /* temporary variable */
 141     unsigned n;
 142     uch *in, *out, ch;
 143
 144     in = window;
 145     out = &output_data[output_ptr];
 146     for (n = 0; n < outcnt; n++) {
 147             ch = *out++ = *in++;
 148             c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
 149     }
 150     crc = c;
 151     bytes_out += (ulg)outcnt;
 152     output_ptr += (ulg)outcnt;
 153     outcnt = 0;
 154 }
 155
 156 static void error(char *x)
 157 {
 158         puts("\n\n");
 159         puts(x);
 160         puts("\n\n -- System halted");
 161
 162         while(1);       /* Halt */
 163 }
 164
 165 #define STACK_SIZE (4096)
 166 long user_stack [STACK_SIZE];
 167 long* stack_start = &user_stack[STACK_SIZE];
 168
 169 void decompress_kernel(void)
 170 {
 171         output_data = 0;
 172         output_ptr = (unsigned long)0x400000;
 173         free_mem_ptr = (unsigned long)&_end;
 174         free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
 175
 176         makecrc();
 177         puts("Uncompressing Linux... ");
 178         gunzip();
 179         puts("Ok, booting the kernel.\n");
 180 }