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/compiler.h>     /* for inline */
  22 #include <linux/types.h>        /* for size_t */
  23 #include <linux/stddef.h>       /* for NULL */
  24 #include <asm/string.h>
  25
  26 #ifdef STANDALONE_DEBUG
  27 #define putstr printf
  28 #else
  29
  30 static void putstr(const char *ptr);
  31
  32 #include <mach/uncompress.h>
  33
  34 #ifdef CONFIG_DEBUG_ICEDCC
  35
  36 #ifdef CONFIG_CPU_V6
  37
  38 static void icedcc_putc(int ch)
  39 {
  40         int status, i = 0x4000000;
  41
  42         do {
  43                 if (--i < 0)
  44                         return;
  45
  46                 asm volatile ("mrc p14, 0, %0, c0, c1, 0" : "=r" (status));
  47         } while (status & (1 << 29));
  48
  49         asm("mcr p14, 0, %0, c0, c5, 0" : : "r" (ch));
  50 }
  51 #elif defined(CONFIG_CPU_XSCALE)
  52
  53 static void icedcc_putc(int ch)
  54 {
  55         int status, i = 0x4000000;
  56
  57         do {
  58                 if (--i < 0)
  59                         return;
  60
  61                 asm volatile ("mrc p14, 0, %0, c14, c0, 0" : "=r" (status));
  62         } while (status & (1 << 28));
  63
  64         asm("mcr p14, 0, %0, c8, c0, 0" : : "r" (ch));
  65 }
  66
  67 #else
  68
  69 static void icedcc_putc(int ch)
  70 {
  71         int status, i = 0x4000000;
  72
  73         do {
  74                 if (--i < 0)
  75                         return;
  76
  77                 asm volatile ("mrc p14, 0, %0, c0, c0, 0" : "=r" (status));
  78         } while (status & 2);
  79
  80         asm("mcr p14, 0, %0, c1, c0, 0" : : "r" (ch));
  81 }
  82
  83 #endif
  84
  85 #define putc(ch)        icedcc_putc(ch)
  86 #define flush() do { } while (0)
  87 #endif
  88
  89 static void putstr(const char *ptr)
  90 {
  91         char c;
  92
  93         while ((c = *ptr++) != '\0') {
  94                 if (c == '\n')
  95                         putc('\r');
  96                 putc(c);
  97         }
  98
  99         flush();
 100 }
 101
 102 #endif
 103
 104 #define __ptr_t void *
 105
 106 #define memzero(s,n) __memzero(s,n)
 107
 108 /*
 109  * Optimised C version of memzero for the ARM.
 110  */
 111 void __memzero (__ptr_t s, size_t n)
 112 {
 113         union { void *vp; unsigned long *ulp; unsigned char *ucp; } u;
 114         int i;
 115
 116         u.vp = s;
 117
 118         for (i = n >> 5; i > 0; i--) {
 119                 *u.ulp++ = 0;
 120                 *u.ulp++ = 0;
 121                 *u.ulp++ = 0;
 122                 *u.ulp++ = 0;
 123                 *u.ulp++ = 0;
 124                 *u.ulp++ = 0;
 125                 *u.ulp++ = 0;
 126                 *u.ulp++ = 0;
 127         }
 128
 129         if (n & 1 << 4) {
 130                 *u.ulp++ = 0;
 131                 *u.ulp++ = 0;
 132                 *u.ulp++ = 0;
 133                 *u.ulp++ = 0;
 134         }
 135
 136         if (n & 1 << 3) {
 137                 *u.ulp++ = 0;
 138                 *u.ulp++ = 0;
 139         }
 140
 141         if (n & 1 << 2)
 142                 *u.ulp++ = 0;
 143
 144         if (n & 1 << 1) {
 145                 *u.ucp++ = 0;
 146                 *u.ucp++ = 0;
 147         }
 148
 149         if (n & 1)
 150                 *u.ucp++ = 0;
 151 }
 152
 153 static inline __ptr_t memcpy(__ptr_t __dest, __const __ptr_t __src,
 154                             size_t __n)
 155 {
 156         int i = 0;
 157         unsigned char *d = (unsigned char *)__dest, *s = (unsigned char *)__src;
 158
 159         for (i = __n >> 3; i > 0; i--) {
 160                 *d++ = *s++;
 161                 *d++ = *s++;
 162                 *d++ = *s++;
 163                 *d++ = *s++;
 164                 *d++ = *s++;
 165                 *d++ = *s++;
 166                 *d++ = *s++;
 167                 *d++ = *s++;
 168         }
 169
 170         if (__n & 1 << 2) {
 171                 *d++ = *s++;
 172                 *d++ = *s++;
 173                 *d++ = *s++;
 174                 *d++ = *s++;
 175         }
 176
 177         if (__n & 1 << 1) {
 178                 *d++ = *s++;
 179                 *d++ = *s++;
 180         }
 181
 182         if (__n & 1)
 183                 *d++ = *s++;
 184
 185         return __dest;
 186 }
 187
 188 /*
 189  * gzip delarations
 190  */
 191 #define OF(args)  args
 192 #define STATIC static
 193
 194 typedef unsigned char  uch;
 195 typedef unsigned short ush;
 196 typedef unsigned long  ulg;
 197
 198 #define WSIZE 0x8000            /* Window size must be at least 32k, */
 199                                 /* and a power of two */
 200
 201 static uch *inbuf;              /* input buffer */
 202 static uch window[WSIZE];       /* Sliding window buffer */
 203
 204 static unsigned insize;         /* valid bytes in inbuf */
 205 static unsigned inptr;          /* index of next byte to be processed in inbuf */
 206 static unsigned outcnt;         /* bytes in output buffer */
 207
 208 /* gzip flag byte */
 209 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
 210 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
 211 #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
 212 #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
 213 #define COMMENT      0x10 /* bit 4 set: file comment present */
 214 #define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
 215 #define RESERVED     0xC0 /* bit 6,7:   reserved */
 216
 217 #define get_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf())
 218
 219 /* Diagnostic functions */
 220 #ifdef DEBUG
 221 #  define Assert(cond,msg) {if(!(cond)) error(msg);}
 222 #  define Trace(x) fprintf x
 223 #  define Tracev(x) {if (verbose) fprintf x ;}
 224 #  define Tracevv(x) {if (verbose>1) fprintf x ;}
 225 #  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
 226 #  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
 227 #else
 228 #  define Assert(cond,msg)
 229 #  define Trace(x)
 230 #  define Tracev(x)
 231 #  define Tracevv(x)
 232 #  define Tracec(c,x)
 233 #  define Tracecv(c,x)
 234 #endif
 235
 236 static int  fill_inbuf(void);
 237 static void flush_window(void);
 238 static void error(char *m);
 239
 240 extern char input_data[];
 241 extern char input_data_end[];
 242
 243 static uch *output_data;
 244 static ulg output_ptr;
 245 static ulg bytes_out;
 246
 247 static void error(char *m);
 248
 249 static void putstr(const char *);
 250
 251 extern int end;
 252 static ulg free_mem_ptr;
 253 static ulg free_mem_end_ptr;
 254
 255 #ifdef STANDALONE_DEBUG
 256 #define NO_INFLATE_MALLOC
 257 #endif
 258
 259 #define ARCH_HAS_DECOMP_WDOG
 260
 261 #include "../../../../lib/inflate.c"
 262
 263 /* ===========================================================================
 264  * Fill the input buffer. This is called only when the buffer is empty
 265  * and at least one byte is really needed.
 266  */
 267 int fill_inbuf(void)
 268 {
 269         if (insize != 0)
 270                 error("ran out of input data");
 271
 272         inbuf = input_data;
 273         insize = &input_data_end[0] - &input_data[0];
 274
 275         inptr = 1;
 276         return inbuf[0];
 277 }
 278
 279 /* ===========================================================================
 280  * Write the output window window[0..outcnt-1] and update crc and bytes_out.
 281  * (Used for the decompressed data only.)
 282  */
 283 void flush_window(void)
 284 {
 285         ulg c = crc;
 286         unsigned n;
 287         uch *in, *out, ch;
 288
 289         in = window;
 290         out = &output_data[output_ptr];
 291         for (n = 0; n < outcnt; n++) {
 292                 ch = *out++ = *in++;
 293                 c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
 294         }
 295         crc = c;
 296         bytes_out += (ulg)outcnt;
 297         output_ptr += (ulg)outcnt;
 298         outcnt = 0;
 299         putstr(".");
 300 }
 301
 302 #ifndef arch_error
 303 #define arch_error(x)
 304 #endif
 305
 306 static void error(char *x)
 307 {
 308         arch_error(x);
 309
 310         putstr("\n\n");
 311         putstr(x);
 312         putstr("\n\n -- System halted");
 313
 314         while(1);       /* Halt */
 315 }
 316
 317 #ifndef STANDALONE_DEBUG
 318
 319 ulg
 320 decompress_kernel(ulg output_start, ulg free_mem_ptr_p, ulg free_mem_ptr_end_p,
 321                   int arch_id)
 322 {
 323         output_data             = (uch *)output_start;  /* Points to kernel start */
 324         free_mem_ptr            = free_mem_ptr_p;
 325         free_mem_end_ptr        = free_mem_ptr_end_p;
 326         __machine_arch_type     = arch_id;
 327
 328         arch_decomp_setup();
 329
 330         makecrc();
 331         putstr("Uncompressing Linux...");
 332         gunzip();
 333         putstr(" done, booting the kernel.\n");
 334         return output_ptr;
 335 }
 336 #else
 337
 338 char output_buffer[1500*1024];
 339
 340 int main()
 341 {
 342         output_data = output_buffer;
 343
 344         makecrc();
 345         putstr("Uncompressing Linux...");
 346         gunzip();
 347         putstr("done.\n");
 348         return 0;
 349 }
 350 #endif
 351