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 32 static void putstr(const char *ptr); 33 extern void error(char *x); 34 35 #include <mach/uncompress.h> 36 37 #ifdef CONFIG_DEBUG_ICEDCC 38 39 #ifdef CONFIG_CPU_V6 40 41 static void icedcc_putc(int ch) 42 { 43 int status, i = 0x4000000; 44 45 do { 46 if (--i < 0) 47 return; 48 49 asm volatile ("mrc p14, 0, %0, c0, c1, 0" : "=r" (status)); 50 } while (status & (1 << 29)); 51 52 asm("mcr p14, 0, %0, c0, c5, 0" : : "r" (ch)); 53 } 54 55 #elif defined(CONFIG_CPU_V7) 56 57 static void icedcc_putc(int ch) 58 { 59 asm( 60 "wait: mrc p14, 0, pc, c0, c1, 0 \n\ 61 bcs wait \n\ 62 mcr p14, 0, %0, c0, c5, 0 " 63 : : "r" (ch)); 64 } 65 66 #elif defined(CONFIG_CPU_XSCALE) 67 68 static void icedcc_putc(int ch) 69 { 70 int status, i = 0x4000000; 71 72 do { 73 if (--i < 0) 74 return; 75 76 asm volatile ("mrc p14, 0, %0, c14, c0, 0" : "=r" (status)); 77 } while (status & (1 << 28)); 78 79 asm("mcr p14, 0, %0, c8, c0, 0" : : "r" (ch)); 80 } 81 82 #else 83 84 static void icedcc_putc(int ch) 85 { 86 int status, i = 0x4000000; 87 88 do { 89 if (--i < 0) 90 return; 91 92 asm volatile ("mrc p14, 0, %0, c0, c0, 0" : "=r" (status)); 93 } while (status & 2); 94 95 asm("mcr p14, 0, %0, c1, c0, 0" : : "r" (ch)); 96 } 97 98 #endif 99 100 #define putc(ch) icedcc_putc(ch) 101 #endif 102 103 static void putstr(const char *ptr) 104 { 105 char c; 106 107 while ((c = *ptr++) != '\0') { 108 if (c == '\n') 109 putc('\r'); 110 putc(c); 111 } 112 113 flush(); 114 } 115 116 117 void *memcpy(void *__dest, __const void *__src, size_t __n) 118 { 119 int i = 0; 120 unsigned char *d = (unsigned char *)__dest, *s = (unsigned char *)__src; 121 122 for (i = __n >> 3; i > 0; i--) { 123 *d++ = *s++; 124 *d++ = *s++; 125 *d++ = *s++; 126 *d++ = *s++; 127 *d++ = *s++; 128 *d++ = *s++; 129 *d++ = *s++; 130 *d++ = *s++; 131 } 132 133 if (__n & 1 << 2) { 134 *d++ = *s++; 135 *d++ = *s++; 136 *d++ = *s++; 137 *d++ = *s++; 138 } 139 140 if (__n & 1 << 1) { 141 *d++ = *s++; 142 *d++ = *s++; 143 } 144 145 if (__n & 1) 146 *d++ = *s++; 147 148 return __dest; 149 } 150 151 /* 152 * gzip delarations 153 */ 154 extern char input_data[]; 155 extern char input_data_end[]; 156 157 unsigned char *output_data; 158 unsigned long output_ptr; 159 160 unsigned long free_mem_ptr; 161 unsigned long free_mem_end_ptr; 162 163 #ifndef arch_error 164 #define arch_error(x) 165 #endif 166 167 void error(char *x) 168 { 169 arch_error(x); 170 171 putstr("\n\n"); 172 putstr(x); 173 putstr("\n\n -- System halted"); 174 175 while(1); /* Halt */ 176 } 177 178 asmlinkage void __div0(void) 179 { 180 error("Attempting division by 0!"); 181 } 182 183 extern void do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x)); 184 185 186 unsigned long 187 decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p, 188 unsigned long free_mem_ptr_end_p, 189 int arch_id) 190 { 191 unsigned char *tmp; 192 193 output_data = (unsigned char *)output_start; 194 free_mem_ptr = free_mem_ptr_p; 195 free_mem_end_ptr = free_mem_ptr_end_p; 196 __machine_arch_type = arch_id; 197 198 arch_decomp_setup(); 199 200 tmp = (unsigned char *) (((unsigned long)input_data_end) - 4); 201 output_ptr = get_unaligned_le32(tmp); 202 203 putstr("Uncompressing Linux..."); 204 do_decompress(input_data, input_data_end - input_data, 205 output_data, error); 206 putstr(" done, booting the kernel.\n"); 207 return output_ptr; 208 } 209