arch/arm/boot/compressed/misc.c

   1 /*
   2  * 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  * Modified for ARM Linux by Russell King
  10  *
  11  * Nicolas Pitre <nico@visuaide.com>  1999/04/14 :
  12  *  For this code to run directly from Flash, all constant variables must
  13  *  be marked with 'const' and all other variables initialized at run-time
  14  *  only.  This way all non constant variables will end up in the bss segment,
  15  *  which should point to addresses in RAM and cleared to 0 on start.
  16  *  This allows for a much quicker boot time.
  17  */
  18
  19 unsigned int __machine_arch_type;
  20
  21 #include <linux/string.h>
  22
  23 #include <asm/arch/uncompress.h>
  24
  25 #ifdef STANDALONE_DEBUG
  26 #define putstr printf
  27 #endif
  28
  29 #ifdef CONFIG_DEBUG_ICEDCC
  30 #define putstr icedcc_putstr
  31 #define putc icedcc_putc
  32
  33 extern void idedcc_putc(int ch);
  34
  35 static void
  36 icedcc_putstr(const char *ptr)
  37 {
  38         for (; *ptr != '\0'; ptr++) {
  39                 icedcc_putc(*ptr);
  40         }
  41 }
  42
  43 #endif
  44
  45 #define __ptr_t void *
  46
  47 /*
  48  * Optimised C version of memzero for the ARM.
  49  */
  50 void __memzero (__ptr_t s, size_t n)
  51 {
  52         union { void *vp; unsigned long *ulp; unsigned char *ucp; } u;
  53         int i;
  54
  55         u.vp = s;
  56
  57         for (i = n >> 5; i > 0; i--) {
  58                 *u.ulp++ = 0;
  59                 *u.ulp++ = 0;
  60                 *u.ulp++ = 0;
  61                 *u.ulp++ = 0;
  62                 *u.ulp++ = 0;
  63                 *u.ulp++ = 0;
  64                 *u.ulp++ = 0;
  65                 *u.ulp++ = 0;
  66         }
  67
  68         if (n & 1 << 4) {
  69                 *u.ulp++ = 0;
  70                 *u.ulp++ = 0;
  71                 *u.ulp++ = 0;
  72                 *u.ulp++ = 0;
  73         }
  74
  75         if (n & 1 << 3) {
  76                 *u.ulp++ = 0;
  77                 *u.ulp++ = 0;
  78         }
  79
  80         if (n & 1 << 2)
  81                 *u.ulp++ = 0;
  82
  83         if (n & 1 << 1) {
  84                 *u.ucp++ = 0;
  85                 *u.ucp++ = 0;
  86         }
  87
  88         if (n & 1)
  89                 *u.ucp++ = 0;
  90 }
  91
  92 static inline __ptr_t memcpy(__ptr_t __dest, __const __ptr_t __src,
  93                             size_t __n)
  94 {
  95         int i = 0;
  96         unsigned char *d = (unsigned char *)__dest, *s = (unsigned char *)__src;
  97
  98         for (i = __n >> 3; i > 0; i--) {
  99                 *d++ = *s++;
 100                 *d++ = *s++;
 101                 *d++ = *s++;
 102                 *d++ = *s++;
 103                 *d++ = *s++;
 104                 *d++ = *s++;
 105                 *d++ = *s++;
 106                 *d++ = *s++;
 107         }
 108
 109         if (__n & 1 << 2) {
 110                 *d++ = *s++;
 111                 *d++ = *s++;
 112                 *d++ = *s++;
 113                 *d++ = *s++;
 114         }
 115
 116         if (__n & 1 << 1) {
 117                 *d++ = *s++;
 118                 *d++ = *s++;
 119         }
 120
 121         if (__n & 1)
 122                 *d++ = *s++;
 123
 124         return __dest;
 125 }
 126
 127 /*
 128  * gzip delarations
 129  */
 130 #define OF(args)  args
 131 #define STATIC static
 132
 133 typedef unsigned char  uch;
 134 typedef unsigned short ush;
 135 typedef unsigned long  ulg;
 136
 137 #define WSIZE 0x8000            /* Window size must be at least 32k, */
 138                                 /* and a power of two */
 139
 140 static uch *inbuf;              /* input buffer */
 141 static uch window[WSIZE];       /* Sliding window buffer */
 142
 143 static unsigned insize;         /* valid bytes in inbuf */
 144 static unsigned inptr;          /* index of next byte to be processed in inbuf */
 145 static unsigned outcnt;         /* bytes in output buffer */
 146
 147 /* gzip flag byte */
 148 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
 149 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
 150 #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
 151 #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
 152 #define COMMENT      0x10 /* bit 4 set: file comment present */
 153 #define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
 154 #define RESERVED     0xC0 /* bit 6,7:   reserved */
 155
 156 #define get_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf())
 157
 158 /* Diagnostic functions */
 159 #ifdef DEBUG
 160 #  define Assert(cond,msg) {if(!(cond)) error(msg);}
 161 #  define Trace(x) fprintf x
 162 #  define Tracev(x) {if (verbose) fprintf x ;}
 163 #  define Tracevv(x) {if (verbose>1) fprintf x ;}
 164 #  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
 165 #  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
 166 #else
 167 #  define Assert(cond,msg)
 168 #  define Trace(x)
 169 #  define Tracev(x)
 170 #  define Tracevv(x)
 171 #  define Tracec(c,x)
 172 #  define Tracecv(c,x)
 173 #endif
 174
 175 static int  fill_inbuf(void);
 176 static void flush_window(void);
 177 static void error(char *m);
 178 static void gzip_mark(void **);
 179 static void gzip_release(void **);
 180
 181 extern char input_data[];
 182 extern char input_data_end[];
 183
 184 static uch *output_data;
 185 static ulg output_ptr;
 186 static ulg bytes_out;
 187
 188 static void *malloc(int size);
 189 static void free(void *where);
 190 static void error(char *m);
 191 static void gzip_mark(void **);
 192 static void gzip_release(void **);
 193
 194 static void putstr(const char *);
 195
 196 extern int end;
 197 static ulg free_mem_ptr;
 198 static ulg free_mem_ptr_end;
 199
 200 #define HEAP_SIZE 0x2000
 201
 202 #include "../../../../lib/inflate.c"
 203
 204 #ifndef STANDALONE_DEBUG
 205 static void *malloc(int size)
 206 {
 207         void *p;
 208
 209         if (size <0) error("Malloc error");
 210         if (free_mem_ptr <= 0) error("Memory error");
 211
 212         free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
 213
 214         p = (void *)free_mem_ptr;
 215         free_mem_ptr += size;
 216
 217         if (free_mem_ptr >= free_mem_ptr_end)
 218                 error("Out of memory");
 219         return p;
 220 }
 221
 222 static void free(void *where)
 223 { /* gzip_mark & gzip_release do the free */
 224 }
 225
 226 static void gzip_mark(void **ptr)
 227 {
 228         arch_decomp_wdog();
 229         *ptr = (void *) free_mem_ptr;
 230 }
 231
 232 static void gzip_release(void **ptr)
 233 {
 234         arch_decomp_wdog();
 235         free_mem_ptr = (long) *ptr;
 236 }
 237 #else
 238 static void gzip_mark(void **ptr)
 239 {
 240 }
 241
 242 static void gzip_release(void **ptr)
 243 {
 244 }
 245 #endif
 246
 247 /* ===========================================================================
 248  * Fill the input buffer. This is called only when the buffer is empty
 249  * and at least one byte is really needed.
 250  */
 251 int fill_inbuf(void)
 252 {
 253         if (insize != 0)
 254                 error("ran out of input data");
 255
 256         inbuf = input_data;
 257         insize = &input_data_end[0] - &input_data[0];
 258
 259         inptr = 1;
 260         return inbuf[0];
 261 }
 262
 263 /* ===========================================================================
 264  * Write the output window window[0..outcnt-1] and update crc and bytes_out.
 265  * (Used for the decompressed data only.)
 266  */
 267 void flush_window(void)
 268 {
 269         ulg c = crc;
 270         unsigned n;
 271         uch *in, *out, ch;
 272
 273         in = window;
 274         out = &output_data[output_ptr];
 275         for (n = 0; n < outcnt; n++) {
 276                 ch = *out++ = *in++;
 277                 c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
 278         }
 279         crc = c;
 280         bytes_out += (ulg)outcnt;
 281         output_ptr += (ulg)outcnt;
 282         outcnt = 0;
 283         putstr(".");
 284 }
 285
 286 static void error(char *x)
 287 {
 288         putstr("\n\n");
 289         putstr(x);
 290         putstr("\n\n -- System halted");
 291
 292         while(1);       /* Halt */
 293 }
 294
 295 #ifndef STANDALONE_DEBUG
 296
 297 ulg
 298 decompress_kernel(ulg output_start, ulg free_mem_ptr_p, ulg free_mem_ptr_end_p,
 299                   int arch_id)
 300 {
 301         output_data             = (uch *)output_start;  /* Points to kernel start */
 302         free_mem_ptr            = free_mem_ptr_p;
 303         free_mem_ptr_end        = free_mem_ptr_end_p;
 304         __machine_arch_type     = arch_id;
 305
 306         arch_decomp_setup();
 307
 308         makecrc();
 309         putstr("Uncompressing Linux...");
 310         gunzip();
 311         putstr(" done, booting the kernel.\n");
 312         return output_ptr;
 313 }
 314 #else
 315
 316 char output_buffer[1500*1024];
 317
 318 int main()
 319 {
 320         output_data = output_buffer;
 321
 322         makecrc();
 323         putstr("Uncompressing Linux...");
 324         gunzip();
 325         putstr("done.\n");
 326         return 0;
 327 }
 328 #endif
 329