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