arch/sh/boot/compressed/misc.c

   1 /*
   2  * arch/sh/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/config.h>
  15 #include <asm/uaccess.h>
  16 #ifdef CONFIG_SH_STANDARD_BIOS
  17 #include <asm/sh_bios.h>
  18 #endif
  19
  20 /*
  21  * gzip declarations
  22  */
  23
  24 #define OF(args)  args
  25 #define STATIC static
  26
  27 #undef memset
  28 #undef memcpy
  29 #define memzero(s, n)     memset ((s), 0, (n))
  30
  31 typedef unsigned char  uch;
  32 typedef unsigned short ush;
  33 typedef unsigned long  ulg;
  34
  35 #define WSIZE 0x8000            /* Window size must be at least 32k, */
  36                                 /* and a power of two */
  37
  38 static uch *inbuf;           /* input buffer */
  39 static uch window[WSIZE];    /* Sliding window buffer */
  40
  41 static unsigned insize = 0;  /* valid bytes in inbuf */
  42 static unsigned inptr = 0;   /* index of next byte to be processed in inbuf */
  43 static unsigned outcnt = 0;  /* bytes in output buffer */
  44
  45 /* gzip flag byte */
  46 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ASCII text */
  47 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
  48 #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
  49 #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
  50 #define COMMENT      0x10 /* bit 4 set: file comment present */
  51 #define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
  52 #define RESERVED     0xC0 /* bit 6,7:   reserved */
  53
  54 #define get_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf())
  55
  56 /* Diagnostic functions */
  57 #ifdef DEBUG
  58 #  define Assert(cond,msg) {if(!(cond)) error(msg);}
  59 #  define Trace(x) fprintf x
  60 #  define Tracev(x) {if (verbose) fprintf x ;}
  61 #  define Tracevv(x) {if (verbose>1) fprintf x ;}
  62 #  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
  63 #  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
  64 #else
  65 #  define Assert(cond,msg)
  66 #  define Trace(x)
  67 #  define Tracev(x)
  68 #  define Tracevv(x)
  69 #  define Tracec(c,x)
  70 #  define Tracecv(c,x)
  71 #endif
  72
  73 static int  fill_inbuf(void);
  74 static void flush_window(void);
  75 static void error(char *m);
  76 static void gzip_mark(void **);
  77 static void gzip_release(void **);
  78
  79 extern char input_data[];
  80 extern int input_len;
  81
  82 static long bytes_out = 0;
  83 static uch *output_data;
  84 static unsigned long output_ptr = 0;
  85
  86 static void *malloc(int size);
  87 static void free(void *where);
  88 static void error(char *m);
  89 static void gzip_mark(void **);
  90 static void gzip_release(void **);
  91
  92 int puts(const char *);
  93
  94 extern int _text;               /* Defined in vmlinux.lds.S */
  95 extern int _end;
  96 static unsigned long free_mem_ptr;
  97 static unsigned long free_mem_end_ptr;
  98
  99 #define HEAP_SIZE             0x10000
 100
 101 #include "../../../../lib/inflate.c"
 102
 103 static void *malloc(int size)
 104 {
 105         void *p;
 106
 107         if (size <0) error("Malloc error");
 108         if (free_mem_ptr == 0) error("Memory error");
 109
 110         free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
 111
 112         p = (void *)free_mem_ptr;
 113         free_mem_ptr += size;
 114
 115         if (free_mem_ptr >= free_mem_end_ptr)
 116                 error("Out of memory");
 117
 118         return p;
 119 }
 120
 121 static void free(void *where)
 122 {       /* Don't care */
 123 }
 124
 125 static void gzip_mark(void **ptr)
 126 {
 127         *ptr = (void *) free_mem_ptr;
 128 }
 129
 130 static void gzip_release(void **ptr)
 131 {
 132         free_mem_ptr = (long) *ptr;
 133 }
 134
 135 #ifdef CONFIG_SH_STANDARD_BIOS
 136 size_t strlen(const char *s)
 137 {
 138         int i = 0;
 139
 140         while (*s++)
 141                 i++;
 142         return i;
 143 }
 144
 145 int puts(const char *s)
 146 {
 147         int len = strlen(s);
 148         sh_bios_console_write(s, len);
 149         return len;
 150 }
 151 #else
 152 int puts(const char *s)
 153 {
 154         /* This should be updated to use the sh-sci routines */
 155         return 0;
 156 }
 157 #endif
 158
 159 void* memset(void* s, int c, size_t n)
 160 {
 161         int i;
 162         char *ss = (char*)s;
 163
 164         for (i=0;i<n;i++) ss[i] = c;
 165         return s;
 166 }
 167
 168 void* memcpy(void* __dest, __const void* __src,
 169                             size_t __n)
 170 {
 171         int i;
 172         char *d = (char *)__dest, *s = (char *)__src;
 173
 174         for (i=0;i<__n;i++) d[i] = s[i];
 175         return __dest;
 176 }
 177
 178 /* ===========================================================================
 179  * Fill the input buffer. This is called only when the buffer is empty
 180  * and at least one byte is really needed.
 181  */
 182 static int fill_inbuf(void)
 183 {
 184         if (insize != 0) {
 185                 error("ran out of input data");
 186         }
 187
 188         inbuf = input_data;
 189         insize = input_len;
 190         inptr = 1;
 191         return inbuf[0];
 192 }
 193
 194 /* ===========================================================================
 195  * Write the output window window[0..outcnt-1] and update crc and bytes_out.
 196  * (Used for the decompressed data only.)
 197  */
 198 static void flush_window(void)
 199 {
 200     ulg c = crc;         /* temporary variable */
 201     unsigned n;
 202     uch *in, *out, ch;
 203
 204     in = window;
 205     out = &output_data[output_ptr];
 206     for (n = 0; n < outcnt; n++) {
 207             ch = *out++ = *in++;
 208             c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
 209     }
 210     crc = c;
 211     bytes_out += (ulg)outcnt;
 212     output_ptr += (ulg)outcnt;
 213     outcnt = 0;
 214 }
 215
 216 static void error(char *x)
 217 {
 218         puts("\n\n");
 219         puts(x);
 220         puts("\n\n -- System halted");
 221
 222         while(1);       /* Halt */
 223 }
 224
 225 #define STACK_SIZE (4096)
 226 long user_stack [STACK_SIZE];
 227 long* stack_start = &user_stack[STACK_SIZE];
 228
 229 void decompress_kernel(void)
 230 {
 231         output_data = 0;
 232         output_ptr = (unsigned long)&_text+0x20001000;
 233         free_mem_ptr = (unsigned long)&_end;
 234         free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
 235
 236         makecrc();
 237         puts("Uncompressing Linux... ");
 238         gunzip();
 239         puts("Ok, booting the kernel.\n");
 240 }