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 #define _LINUX_STRING_H_ 22 23 #include <linux/compiler.h> /* for inline */ 24 #include <linux/types.h> /* for size_t */ 25 #include <linux/stddef.h> /* for NULL */ 26 #include <asm/string.h> 27 #include <linux/linkage.h> 28 29 #include <asm/unaligned.h> 30 31 #ifdef STANDALONE_DEBUG 32 #define putstr printf 33 #else 34 35 static void putstr(const char *ptr); 36 37 #include <mach/uncompress.h> 38 39 #ifdef CONFIG_DEBUG_ICEDCC 40 41 #ifdef CONFIG_CPU_V6 42 43 static void icedcc_putc(int ch) 44 { 45 int status, i = 0x4000000; 46 47 do { 48 if (--i < 0) 49 return; 50 51 asm volatile ("mrc p14, 0, %0, c0, c1, 0" : "=r" (status)); 52 } while (status & (1 << 29)); 53 54 asm("mcr p14, 0, %0, c0, c5, 0" : : "r" (ch)); 55 } 56 #elif defined(CONFIG_CPU_XSCALE) 57 58 static void icedcc_putc(int ch) 59 { 60 int status, i = 0x4000000; 61 62 do { 63 if (--i < 0) 64 return; 65 66 asm volatile ("mrc p14, 0, %0, c14, c0, 0" : "=r" (status)); 67 } while (status & (1 << 28)); 68 69 asm("mcr p14, 0, %0, c8, c0, 0" : : "r" (ch)); 70 } 71 72 #else 73 74 static void icedcc_putc(int ch) 75 { 76 int status, i = 0x4000000; 77 78 do { 79 if (--i < 0) 80 return; 81 82 asm volatile ("mrc p14, 0, %0, c0, c0, 0" : "=r" (status)); 83 } while (status & 2); 84 85 asm("mcr p14, 0, %0, c1, c0, 0" : : "r" (ch)); 86 } 87 88 #endif 89 90 #define putc(ch) icedcc_putc(ch) 91 #define flush() do { } while (0) 92 #endif 93 94 static void putstr(const char *ptr) 95 { 96 char c; 97 98 while ((c = *ptr++) != '\0') { 99 if (c == '\n') 100 putc('\r'); 101 putc(c); 102 } 103 104 flush(); 105 } 106 107 #endif 108 109 #define __ptr_t void * 110 111 #define memzero(s,n) __memzero(s,n) 112 113 /* 114 * Optimised C version of memzero for the ARM. 115 */ 116 void __memzero (__ptr_t s, size_t n) 117 { 118 union { void *vp; unsigned long *ulp; unsigned char *ucp; } u; 119 int i; 120 121 u.vp = s; 122 123 for (i = n >> 5; i > 0; i--) { 124 *u.ulp++ = 0; 125 *u.ulp++ = 0; 126 *u.ulp++ = 0; 127 *u.ulp++ = 0; 128 *u.ulp++ = 0; 129 *u.ulp++ = 0; 130 *u.ulp++ = 0; 131 *u.ulp++ = 0; 132 } 133 134 if (n & 1 << 4) { 135 *u.ulp++ = 0; 136 *u.ulp++ = 0; 137 *u.ulp++ = 0; 138 *u.ulp++ = 0; 139 } 140 141 if (n & 1 << 3) { 142 *u.ulp++ = 0; 143 *u.ulp++ = 0; 144 } 145 146 if (n & 1 << 2) 147 *u.ulp++ = 0; 148 149 if (n & 1 << 1) { 150 *u.ucp++ = 0; 151 *u.ucp++ = 0; 152 } 153 154 if (n & 1) 155 *u.ucp++ = 0; 156 } 157 158 static inline __ptr_t memcpy(__ptr_t __dest, __const __ptr_t __src, 159 size_t __n) 160 { 161 int i = 0; 162 unsigned char *d = (unsigned char *)__dest, *s = (unsigned char *)__src; 163 164 for (i = __n >> 3; i > 0; i--) { 165 *d++ = *s++; 166 *d++ = *s++; 167 *d++ = *s++; 168 *d++ = *s++; 169 *d++ = *s++; 170 *d++ = *s++; 171 *d++ = *s++; 172 *d++ = *s++; 173 } 174 175 if (__n & 1 << 2) { 176 *d++ = *s++; 177 *d++ = *s++; 178 *d++ = *s++; 179 *d++ = *s++; 180 } 181 182 if (__n & 1 << 1) { 183 *d++ = *s++; 184 *d++ = *s++; 185 } 186 187 if (__n & 1) 188 *d++ = *s++; 189 190 return __dest; 191 } 192 193 /* 194 * gzip delarations 195 */ 196 #define STATIC static 197 198 /* Diagnostic functions */ 199 #ifdef DEBUG 200 # define Assert(cond,msg) {if(!(cond)) error(msg);} 201 # define Trace(x) fprintf x 202 # define Tracev(x) {if (verbose) fprintf x ;} 203 # define Tracevv(x) {if (verbose>1) fprintf x ;} 204 # define Tracec(c,x) {if (verbose && (c)) fprintf x ;} 205 # define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;} 206 #else 207 # define Assert(cond,msg) 208 # define Trace(x) 209 # define Tracev(x) 210 # define Tracevv(x) 211 # define Tracec(c,x) 212 # define Tracecv(c,x) 213 #endif 214 215 static void error(char *m); 216 217 extern char input_data[]; 218 extern char input_data_end[]; 219 220 static unsigned char *output_data; 221 static unsigned long output_ptr; 222 223 static void error(char *m); 224 225 static void putstr(const char *); 226 227 static unsigned long free_mem_ptr; 228 static unsigned long free_mem_end_ptr; 229 230 #ifdef STANDALONE_DEBUG 231 #define NO_INFLATE_MALLOC 232 #endif 233 234 #define ARCH_HAS_DECOMP_WDOG 235 236 #ifdef CONFIG_KERNEL_GZIP 237 #include "../../../../lib/decompress_inflate.c" 238 #endif 239 240 #ifdef CONFIG_KERNEL_LZO 241 #include "../../../../lib/decompress_unlzo.c" 242 #endif 243 244 #ifndef arch_error 245 #define arch_error(x) 246 #endif 247 248 static void error(char *x) 249 { 250 arch_error(x); 251 252 putstr("\n\n"); 253 putstr(x); 254 putstr("\n\n -- System halted"); 255 256 while(1); /* Halt */ 257 } 258 259 asmlinkage void __div0(void) 260 { 261 error("Attempting division by 0!"); 262 } 263 264 #ifndef STANDALONE_DEBUG 265 266 unsigned long 267 decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p, 268 unsigned long free_mem_ptr_end_p, 269 int arch_id) 270 { 271 unsigned char *tmp; 272 273 output_data = (unsigned char *)output_start; 274 free_mem_ptr = free_mem_ptr_p; 275 free_mem_end_ptr = free_mem_ptr_end_p; 276 __machine_arch_type = arch_id; 277 278 arch_decomp_setup(); 279 280 tmp = (unsigned char *) (((unsigned long)input_data_end) - 4); 281 output_ptr = get_unaligned_le32(tmp); 282 283 putstr("Uncompressing Linux..."); 284 decompress(input_data, input_data_end - input_data, 285 NULL, NULL, output_data, NULL, error); 286 putstr(" done, booting the kernel.\n"); 287 return output_ptr; 288 } 289 #else 290 291 char output_buffer[1500*1024]; 292 293 int main() 294 { 295 output_data = output_buffer; 296 297 putstr("Uncompressing Linux..."); 298 decompress(input_data, input_data_end - input_data, 299 NULL, NULL, output_data, NULL, error); 300 putstr("done.\n"); 301 return 0; 302 } 303 #endif 304