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