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 <asm/uaccess.h> 25 26#define memzero(s,n) memset ((s),0,(n)) 27#define puts srm_printk 28extern 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 37typedef unsigned char uch; 38typedef unsigned short ush; 39typedef unsigned long ulg; 40 41#define WSIZE 0x8000 /* Window size must be at least 32k, */ 42 /* and a power of two */ 43 44static uch *inbuf; /* input buffer */ 45static uch *window; /* Sliding window buffer */ 46 47static unsigned insize; /* valid bytes in inbuf */ 48static unsigned inptr; /* index of next byte to be processed in inbuf */ 49static 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 79static int fill_inbuf(void); 80static void flush_window(void); 81static void error(char *m); 82 83static char *input_data; 84static int input_data_size; 85 86static uch *output_data; 87static ulg output_ptr; 88static ulg bytes_out; 89 90static void error(char *m); 91static void gzip_mark(void **); 92static void gzip_release(void **); 93 94extern int end; 95static ulg free_mem_ptr; 96static 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 */ 106int 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 */ 122void 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 141static 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 150unsigned int 151decompress_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 free_mem_ptr = (ulg)output_start + ksize; 161 free_mem_end_ptr = (ulg)output_start + ksize + 0x200000; 162 163 /* put in temp area to reduce initial footprint */ 164 window = malloc(WSIZE); 165 166 makecrc(); 167/* puts("Uncompressing Linux..."); */ 168 gunzip(); 169/* puts(" done, booting the kernel.\n"); */ 170 return output_ptr; 171} 172