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 #if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K) || defined(CONFIG_CPU_V7) 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 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 #endif 92 93 static void putstr(const char *ptr) 94 { 95 char c; 96 97 while ((c = *ptr++) != '\0') { 98 if (c == '\n') 99 putc('\r'); 100 putc(c); 101 } 102 103 flush(); 104 } 105 106 107 void *memcpy(void *__dest, __const void *__src, size_t __n) 108 { 109 int i = 0; 110 unsigned char *d = (unsigned char *)__dest, *s = (unsigned char *)__src; 111 112 for (i = __n >> 3; i > 0; i--) { 113 *d++ = *s++; 114 *d++ = *s++; 115 *d++ = *s++; 116 *d++ = *s++; 117 *d++ = *s++; 118 *d++ = *s++; 119 *d++ = *s++; 120 *d++ = *s++; 121 } 122 123 if (__n & 1 << 2) { 124 *d++ = *s++; 125 *d++ = *s++; 126 *d++ = *s++; 127 *d++ = *s++; 128 } 129 130 if (__n & 1 << 1) { 131 *d++ = *s++; 132 *d++ = *s++; 133 } 134 135 if (__n & 1) 136 *d++ = *s++; 137 138 return __dest; 139 } 140 141 /* 142 * gzip delarations 143 */ 144 extern char input_data[]; 145 extern char input_data_end[]; 146 147 unsigned char *output_data; 148 unsigned long output_ptr; 149 150 unsigned long free_mem_ptr; 151 unsigned long free_mem_end_ptr; 152 153 #ifndef arch_error 154 #define arch_error(x) 155 #endif 156 157 void error(char *x) 158 { 159 arch_error(x); 160 161 putstr("\n\n"); 162 putstr(x); 163 putstr("\n\n -- System halted"); 164 165 while(1); /* Halt */ 166 } 167 168 asmlinkage void __div0(void) 169 { 170 error("Attempting division by 0!"); 171 } 172 173 extern void do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x)); 174 175 176 unsigned long 177 decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p, 178 unsigned long free_mem_ptr_end_p, 179 int arch_id) 180 { 181 unsigned char *tmp; 182 183 output_data = (unsigned char *)output_start; 184 free_mem_ptr = free_mem_ptr_p; 185 free_mem_end_ptr = free_mem_ptr_end_p; 186 __machine_arch_type = arch_id; 187 188 arch_decomp_setup(); 189 190 tmp = (unsigned char *) (((unsigned long)input_data_end) - 4); 191 output_ptr = get_unaligned_le32(tmp); 192 193 putstr("Uncompressing Linux..."); 194 do_decompress(input_data, input_data_end - input_data, 195 output_data, error); 196 putstr(" done, booting the kernel.\n"); 197 return output_ptr; 198 } 199