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 #include <linux/slab.h> 23 24 #include <linux/uaccess.h> 25 26 #define memzero(s,n) memset ((s),0,(n)) 27 #define puts srm_printk 28 extern long srm_printk(const char *, ...) 29 __attribute__ ((format (printf, 1, 2))); 30 31 /* 32 * gzip delarations 33 */ 34 #define OF(args) args 35 #define STATIC static 36 37 typedef unsigned char uch; 38 typedef unsigned short ush; 39 typedef unsigned long ulg; 40 41 #define WSIZE 0x8000 /* Window size must be at least 32k, */ 42 /* and a power of two */ 43 44 static uch *inbuf; /* input buffer */ 45 static uch *window; /* Sliding window buffer */ 46 47 static unsigned insize; /* valid bytes in inbuf */ 48 static unsigned inptr; /* index of next byte to be processed in inbuf */ 49 static unsigned outcnt; /* bytes in output buffer */ 50 51 /* gzip flag byte */ 52 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */ 53 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */ 54 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ 55 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */ 56 #define COMMENT 0x10 /* bit 4 set: file comment present */ 57 #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */ 58 #define RESERVED 0xC0 /* bit 6,7: reserved */ 59 60 #define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf()) 61 62 /* Diagnostic functions */ 63 #ifdef DEBUG 64 # define Assert(cond,msg) {if(!(cond)) error(msg);} 65 # define Trace(x) fprintf x 66 # define Tracev(x) {if (verbose) fprintf x ;} 67 # define Tracevv(x) {if (verbose>1) fprintf x ;} 68 # define Tracec(c,x) {if (verbose && (c)) fprintf x ;} 69 # define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;} 70 #else 71 # define Assert(cond,msg) 72 # define Trace(x) 73 # define Tracev(x) 74 # define Tracevv(x) 75 # define Tracec(c,x) 76 # define Tracecv(c,x) 77 #endif 78 79 static int fill_inbuf(void); 80 static void flush_window(void); 81 static void error(char *m); 82 83 static char *input_data; 84 static int input_data_size; 85 86 static uch *output_data; 87 static ulg output_ptr; 88 static ulg bytes_out; 89 90 static void error(char *m); 91 static void gzip_mark(void **); 92 static void gzip_release(void **); 93 94 extern int end; 95 static ulg free_mem_ptr; 96 static ulg free_mem_end_ptr; 97 98 #define HEAP_SIZE 0x3000 99 100 #include "../../../lib/inflate.c" 101 102 /* =========================================================================== 103 * Fill the input buffer. This is called only when the buffer is empty 104 * and at least one byte is really needed. 105 */ 106 int fill_inbuf(void) 107 { 108 if (insize != 0) 109 error("ran out of input data"); 110 111 inbuf = input_data; 112 insize = input_data_size; 113 114 inptr = 1; 115 return inbuf[0]; 116 } 117 118 /* =========================================================================== 119 * Write the output window window[0..outcnt-1] and update crc and bytes_out. 120 * (Used for the decompressed data only.) 121 */ 122 void flush_window(void) 123 { 124 ulg c = crc; 125 unsigned n; 126 uch *in, *out, ch; 127 128 in = window; 129 out = &output_data[output_ptr]; 130 for (n = 0; n < outcnt; n++) { 131 ch = *out++ = *in++; 132 c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8); 133 } 134 crc = c; 135 bytes_out += (ulg)outcnt; 136 output_ptr += (ulg)outcnt; 137 outcnt = 0; 138 /* puts("."); */ 139 } 140 141 static void error(char *x) 142 { 143 puts("\n\n"); 144 puts(x); 145 puts("\n\n -- System halted"); 146 147 while(1); /* Halt */ 148 } 149 150 unsigned int 151 decompress_kernel(void *output_start, 152 void *input_start, 153 size_t ksize, 154 size_t kzsize) 155 { 156 output_data = (uch *)output_start; 157 input_data = (uch *)input_start; 158 input_data_size = kzsize; /* use compressed size */ 159 160 /* FIXME FIXME FIXME */ 161 free_mem_ptr = (ulg)output_start + ksize; 162 free_mem_end_ptr = (ulg)output_start + ksize + 0x200000; 163 /* FIXME FIXME FIXME */ 164 165 /* put in temp area to reduce initial footprint */ 166 window = malloc(WSIZE); 167 168 makecrc(); 169 /* puts("Uncompressing Linux..."); */ 170 gunzip(); 171 /* puts(" done, booting the kernel.\n"); */ 172 return output_ptr; 173 } 174