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 * Modified for Alpha, from the ARM version, by Jay Estabrook 2003. 19 */ 20 21 #include <linux/kernel.h> 22 23 #include <asm/uaccess.h> 24 25 #define memzero(s,n) memset ((s),0,(n)) 26 #define puts srm_printk 27 extern long srm_printk(const char *, ...) 28 __attribute__ ((format (printf, 1, 2))); 29 30 /* 31 * gzip delarations 32 */ 33 #define OF(args) args 34 #define STATIC static 35 36 typedef unsigned char uch; 37 typedef unsigned short ush; 38 typedef unsigned long ulg; 39 40 #define WSIZE 0x8000 /* Window size must be at least 32k, */ 41 /* and a power of two */ 42 43 static uch *inbuf; /* input buffer */ 44 static uch *window; /* Sliding window buffer */ 45 46 static unsigned insize; /* valid bytes in inbuf */ 47 static unsigned inptr; /* index of next byte to be processed in inbuf */ 48 static unsigned outcnt; /* bytes in output buffer */ 49 50 /* gzip flag byte */ 51 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */ 52 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */ 53 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ 54 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */ 55 #define COMMENT 0x10 /* bit 4 set: file comment present */ 56 #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */ 57 #define RESERVED 0xC0 /* bit 6,7: reserved */ 58 59 #define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf()) 60 61 /* Diagnostic functions */ 62 #ifdef DEBUG 63 # define Assert(cond,msg) {if(!(cond)) error(msg);} 64 # define Trace(x) fprintf x 65 # define Tracev(x) {if (verbose) fprintf x ;} 66 # define Tracevv(x) {if (verbose>1) fprintf x ;} 67 # define Tracec(c,x) {if (verbose && (c)) fprintf x ;} 68 # define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;} 69 #else 70 # define Assert(cond,msg) 71 # define Trace(x) 72 # define Tracev(x) 73 # define Tracevv(x) 74 # define Tracec(c,x) 75 # define Tracecv(c,x) 76 #endif 77 78 static int fill_inbuf(void); 79 static void flush_window(void); 80 static void error(char *m); 81 82 static char *input_data; 83 static int input_data_size; 84 85 static uch *output_data; 86 static ulg output_ptr; 87 static ulg bytes_out; 88 89 static void error(char *m); 90 static void gzip_mark(void **); 91 static void gzip_release(void **); 92 93 extern int end; 94 static ulg free_mem_ptr; 95 static ulg free_mem_end_ptr; 96 97 #define HEAP_SIZE 0x3000 98 99 #include "../../../lib/inflate.c" 100 101 /* =========================================================================== 102 * Fill the input buffer. This is called only when the buffer is empty 103 * and at least one byte is really needed. 104 */ 105 int fill_inbuf(void) 106 { 107 if (insize != 0) 108 error("ran out of input data"); 109 110 inbuf = input_data; 111 insize = input_data_size; 112 113 inptr = 1; 114 return inbuf[0]; 115 } 116 117 /* =========================================================================== 118 * Write the output window window[0..outcnt-1] and update crc and bytes_out. 119 * (Used for the decompressed data only.) 120 */ 121 void flush_window(void) 122 { 123 ulg c = crc; 124 unsigned n; 125 uch *in, *out, ch; 126 127 in = window; 128 out = &output_data[output_ptr]; 129 for (n = 0; n < outcnt; n++) { 130 ch = *out++ = *in++; 131 c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8); 132 } 133 crc = c; 134 bytes_out += (ulg)outcnt; 135 output_ptr += (ulg)outcnt; 136 outcnt = 0; 137 /* puts("."); */ 138 } 139 140 static void error(char *x) 141 { 142 puts("\n\n"); 143 puts(x); 144 puts("\n\n -- System halted"); 145 146 while(1); /* Halt */ 147 } 148 149 unsigned int 150 decompress_kernel(void *output_start, 151 void *input_start, 152 size_t ksize, 153 size_t kzsize) 154 { 155 output_data = (uch *)output_start; 156 input_data = (uch *)input_start; 157 input_data_size = kzsize; /* use compressed size */ 158 159 /* FIXME FIXME FIXME */ 160 free_mem_ptr = (ulg)output_start + ksize; 161 free_mem_end_ptr = (ulg)output_start + ksize + 0x200000; 162 /* FIXME FIXME FIXME */ 163 164 /* put in temp area to reduce initial footprint */ 165 window = malloc(WSIZE); 166 167 makecrc(); 168 /* puts("Uncompressing Linux..."); */ 169 gunzip(); 170 /* puts(" done, booting the kernel.\n"); */ 171 return output_ptr; 172 } 173