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 <linux/linkage.h> 27 #include <asm/string.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 extern void error(char *x); 37 38 #include <mach/uncompress.h> 39 40 #ifdef CONFIG_DEBUG_ICEDCC 41 42 #ifdef CONFIG_CPU_V6 43 44 static void icedcc_putc(int ch) 45 { 46 int status, i = 0x4000000; 47 48 do { 49 if (--i < 0) 50 return; 51 52 asm volatile ("mrc p14, 0, %0, c0, c1, 0" : "=r" (status)); 53 } while (status & (1 << 29)); 54 55 asm("mcr p14, 0, %0, c0, c5, 0" : : "r" (ch)); 56 } 57 58 #elif defined(CONFIG_CPU_V7) 59 60 static void icedcc_putc(int ch) 61 { 62 asm( 63 "wait: mrc p14, 0, pc, c0, c1, 0 \n\ 64 bcs wait \n\ 65 mcr p14, 0, %0, c0, c5, 0 " 66 : : "r" (ch)); 67 } 68 69 #elif defined(CONFIG_CPU_XSCALE) 70 71 static void icedcc_putc(int ch) 72 { 73 int status, i = 0x4000000; 74 75 do { 76 if (--i < 0) 77 return; 78 79 asm volatile ("mrc p14, 0, %0, c14, c0, 0" : "=r" (status)); 80 } while (status & (1 << 28)); 81 82 asm("mcr p14, 0, %0, c8, c0, 0" : : "r" (ch)); 83 } 84 85 #else 86 87 static void icedcc_putc(int ch) 88 { 89 int status, i = 0x4000000; 90 91 do { 92 if (--i < 0) 93 return; 94 95 asm volatile ("mrc p14, 0, %0, c0, c0, 0" : "=r" (status)); 96 } while (status & 2); 97 98 asm("mcr p14, 0, %0, c1, c0, 0" : : "r" (ch)); 99 } 100 101 #endif 102 103 #define putc(ch) icedcc_putc(ch) 104 #endif 105 106 static void putstr(const char *ptr) 107 { 108 char c; 109 110 while ((c = *ptr++) != '\0') { 111 if (c == '\n') 112 putc('\r'); 113 putc(c); 114 } 115 116 flush(); 117 } 118 119 #endif 120 121 void *memcpy(void *__dest, __const void *__src, size_t __n) 122 { 123 int i = 0; 124 unsigned char *d = (unsigned char *)__dest, *s = (unsigned char *)__src; 125 126 for (i = __n >> 3; i > 0; i--) { 127 *d++ = *s++; 128 *d++ = *s++; 129 *d++ = *s++; 130 *d++ = *s++; 131 *d++ = *s++; 132 *d++ = *s++; 133 *d++ = *s++; 134 *d++ = *s++; 135 } 136 137 if (__n & 1 << 2) { 138 *d++ = *s++; 139 *d++ = *s++; 140 *d++ = *s++; 141 *d++ = *s++; 142 } 143 144 if (__n & 1 << 1) { 145 *d++ = *s++; 146 *d++ = *s++; 147 } 148 149 if (__n & 1) 150 *d++ = *s++; 151 152 return __dest; 153 } 154 155 /* 156 * gzip delarations 157 */ 158 extern char input_data[]; 159 extern char input_data_end[]; 160 161 unsigned char *output_data; 162 unsigned long output_ptr; 163 164 unsigned long free_mem_ptr; 165 unsigned long free_mem_end_ptr; 166 167 #ifndef arch_error 168 #define arch_error(x) 169 #endif 170 171 void error(char *x) 172 { 173 arch_error(x); 174 175 putstr("\n\n"); 176 putstr(x); 177 putstr("\n\n -- System halted"); 178 179 while(1); /* Halt */ 180 } 181 182 asmlinkage void __div0(void) 183 { 184 error("Attempting division by 0!"); 185 } 186 187 extern void do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x)); 188 189 #ifndef STANDALONE_DEBUG 190 191 unsigned long 192 decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p, 193 unsigned long free_mem_ptr_end_p, 194 int arch_id) 195 { 196 unsigned char *tmp; 197 198 output_data = (unsigned char *)output_start; 199 free_mem_ptr = free_mem_ptr_p; 200 free_mem_end_ptr = free_mem_ptr_end_p; 201 __machine_arch_type = arch_id; 202 203 arch_decomp_setup(); 204 205 tmp = (unsigned char *) (((unsigned long)input_data_end) - 4); 206 output_ptr = get_unaligned_le32(tmp); 207 208 putstr("Uncompressing Linux..."); 209 do_decompress(input_data, input_data_end - input_data, 210 output_data, error); 211 putstr(" done, booting the kernel.\n"); 212 return output_ptr; 213 } 214 #else 215 216 char output_buffer[1500*1024]; 217 218 int main() 219 { 220 output_data = output_buffer; 221 222 putstr("Uncompressing Linux..."); 223 decompress(input_data, input_data_end - input_data, 224 NULL, NULL, output_data, NULL, error); 225 putstr("done.\n"); 226 return 0; 227 } 228 #endif 229