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 30 static void putstr(const char *ptr); 31 extern void error(char *x); 32 33 #include <mach/uncompress.h> 34 35 #ifdef CONFIG_DEBUG_ICEDCC 36 37 #if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K) || defined(CONFIG_CPU_V7) 38 39 static void icedcc_putc(int ch) 40 { 41 int status, i = 0x4000000; 42 43 do { 44 if (--i < 0) 45 return; 46 47 asm volatile ("mrc p14, 0, %0, c0, c1, 0" : "=r" (status)); 48 } while (status & (1 << 29)); 49 50 asm("mcr p14, 0, %0, c0, c5, 0" : : "r" (ch)); 51 } 52 53 54 #elif defined(CONFIG_CPU_XSCALE) 55 56 static void icedcc_putc(int ch) 57 { 58 int status, i = 0x4000000; 59 60 do { 61 if (--i < 0) 62 return; 63 64 asm volatile ("mrc p14, 0, %0, c14, c0, 0" : "=r" (status)); 65 } while (status & (1 << 28)); 66 67 asm("mcr p14, 0, %0, c8, c0, 0" : : "r" (ch)); 68 } 69 70 #else 71 72 static void icedcc_putc(int ch) 73 { 74 int status, i = 0x4000000; 75 76 do { 77 if (--i < 0) 78 return; 79 80 asm volatile ("mrc p14, 0, %0, c0, c0, 0" : "=r" (status)); 81 } while (status & 2); 82 83 asm("mcr p14, 0, %0, c1, c0, 0" : : "r" (ch)); 84 } 85 86 #endif 87 88 #define putc(ch) icedcc_putc(ch) 89 #endif 90 91 static void putstr(const char *ptr) 92 { 93 char c; 94 95 while ((c = *ptr++) != '\0') { 96 if (c == '\n') 97 putc('\r'); 98 putc(c); 99 } 100 101 flush(); 102 } 103 104 105 void *memcpy(void *__dest, __const void *__src, size_t __n) 106 { 107 int i = 0; 108 unsigned char *d = (unsigned char *)__dest, *s = (unsigned char *)__src; 109 110 for (i = __n >> 3; i > 0; i--) { 111 *d++ = *s++; 112 *d++ = *s++; 113 *d++ = *s++; 114 *d++ = *s++; 115 *d++ = *s++; 116 *d++ = *s++; 117 *d++ = *s++; 118 *d++ = *s++; 119 } 120 121 if (__n & 1 << 2) { 122 *d++ = *s++; 123 *d++ = *s++; 124 *d++ = *s++; 125 *d++ = *s++; 126 } 127 128 if (__n & 1 << 1) { 129 *d++ = *s++; 130 *d++ = *s++; 131 } 132 133 if (__n & 1) 134 *d++ = *s++; 135 136 return __dest; 137 } 138 139 /* 140 * gzip declarations 141 */ 142 extern char input_data[]; 143 extern char input_data_end[]; 144 145 unsigned char *output_data; 146 147 unsigned long free_mem_ptr; 148 unsigned long free_mem_end_ptr; 149 150 #ifndef arch_error 151 #define arch_error(x) 152 #endif 153 154 void error(char *x) 155 { 156 arch_error(x); 157 158 putstr("\n\n"); 159 putstr(x); 160 putstr("\n\n -- System halted"); 161 162 while(1); /* Halt */ 163 } 164 165 asmlinkage void __div0(void) 166 { 167 error("Attempting division by 0!"); 168 } 169 170 extern int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x)); 171 172 173 void 174 decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p, 175 unsigned long free_mem_ptr_end_p, 176 int arch_id) 177 { 178 int ret; 179 180 output_data = (unsigned char *)output_start; 181 free_mem_ptr = free_mem_ptr_p; 182 free_mem_end_ptr = free_mem_ptr_end_p; 183 __machine_arch_type = arch_id; 184 185 arch_decomp_setup(); 186 187 putstr("Uncompressing Linux..."); 188 ret = do_decompress(input_data, input_data_end - input_data, 189 output_data, error); 190 if (ret) 191 error("decompressor returned an error"); 192 else 193 putstr(" done, booting the kernel.\n"); 194 } 195