1/* 2 * arch/sh/boot/compressed/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 * Adapted for SH by Stuart Menefy, Aug 1999 10 * 11 * Modified to use standard LinuxSH BIOS by Greg Banks 7Jul2000 12 */ 13 14#include <asm/uaccess.h> 15#include <asm/addrspace.h> 16#include <asm/page.h> 17#ifdef CONFIG_SH_STANDARD_BIOS 18#include <asm/sh_bios.h> 19#endif 20 21/* 22 * gzip declarations 23 */ 24 25#define OF(args) args 26#define STATIC static 27 28#undef memset 29#undef memcpy 30#define memzero(s, n) memset ((s), 0, (n)) 31 32typedef unsigned char uch; 33typedef unsigned short ush; 34typedef unsigned long ulg; 35 36#define WSIZE 0x8000 /* Window size must be at least 32k, */ 37 /* and a power of two */ 38 39static uch *inbuf; /* input buffer */ 40static uch window[WSIZE]; /* Sliding window buffer */ 41 42static unsigned insize = 0; /* valid bytes in inbuf */ 43static unsigned inptr = 0; /* index of next byte to be processed in inbuf */ 44static unsigned outcnt = 0; /* bytes in output buffer */ 45 46/* gzip flag byte */ 47#define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */ 48#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */ 49#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ 50#define ORIG_NAME 0x08 /* bit 3 set: original file name present */ 51#define COMMENT 0x10 /* bit 4 set: file comment present */ 52#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */ 53#define RESERVED 0xC0 /* bit 6,7: reserved */ 54 55#define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf()) 56 57/* Diagnostic functions */ 58#ifdef DEBUG 59# define Assert(cond,msg) {if(!(cond)) error(msg);} 60# define Trace(x) fprintf x 61# define Tracev(x) {if (verbose) fprintf x ;} 62# define Tracevv(x) {if (verbose>1) fprintf x ;} 63# define Tracec(c,x) {if (verbose && (c)) fprintf x ;} 64# define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;} 65#else 66# define Assert(cond,msg) 67# define Trace(x) 68# define Tracev(x) 69# define Tracevv(x) 70# define Tracec(c,x) 71# define Tracecv(c,x) 72#endif 73 74static int fill_inbuf(void); 75static void flush_window(void); 76static void error(char *m); 77static void gzip_mark(void **); 78static void gzip_release(void **); 79 80extern char input_data[]; 81extern int input_len; 82 83static long bytes_out = 0; 84static uch *output_data; 85static unsigned long output_ptr = 0; 86 87static void *malloc(int size); 88static void free(void *where); 89static void error(char *m); 90static void gzip_mark(void **); 91static void gzip_release(void **); 92 93int puts(const char *); 94 95extern int _text; /* Defined in vmlinux.lds.S */ 96extern int _end; 97static unsigned long free_mem_ptr; 98static unsigned long free_mem_end_ptr; 99 100#define HEAP_SIZE 0x10000 101 102#include "../../../../lib/inflate.c" 103 104static void *malloc(int size) 105{ 106 void *p; 107 108 if (size <0) error("Malloc error"); 109 if (free_mem_ptr == 0) error("Memory error"); 110 111 free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */ 112 113 p = (void *)free_mem_ptr; 114 free_mem_ptr += size; 115 116 if (free_mem_ptr >= free_mem_end_ptr) 117 error("Out of memory"); 118 119 return p; 120} 121 122static void free(void *where) 123{ /* Don't care */ 124} 125 126static void gzip_mark(void **ptr) 127{ 128 *ptr = (void *) free_mem_ptr; 129} 130 131static void gzip_release(void **ptr) 132{ 133 free_mem_ptr = (long) *ptr; 134} 135 136#ifdef CONFIG_SH_STANDARD_BIOS 137size_t strlen(const char *s) 138{ 139 int i = 0; 140 141 while (*s++) 142 i++; 143 return i; 144} 145 146int puts(const char *s) 147{ 148 int len = strlen(s); 149 sh_bios_console_write(s, len); 150 return len; 151} 152#else 153int puts(const char *s) 154{ 155 /* This should be updated to use the sh-sci routines */ 156 return 0; 157} 158#endif 159 160void* memset(void* s, int c, size_t n) 161{ 162 int i; 163 char *ss = (char*)s; 164 165 for (i=0;i<n;i++) ss[i] = c; 166 return s; 167} 168 169void* memcpy(void* __dest, __const void* __src, 170 size_t __n) 171{ 172 int i; 173 char *d = (char *)__dest, *s = (char *)__src; 174 175 for (i=0;i<__n;i++) d[i] = s[i]; 176 return __dest; 177} 178 179/* =========================================================================== 180 * Fill the input buffer. This is called only when the buffer is empty 181 * and at least one byte is really needed. 182 */ 183static int fill_inbuf(void) 184{ 185 if (insize != 0) { 186 error("ran out of input data"); 187 } 188 189 inbuf = input_data; 190 insize = input_len; 191 inptr = 1; 192 return inbuf[0]; 193} 194 195/* =========================================================================== 196 * Write the output window window[0..outcnt-1] and update crc and bytes_out. 197 * (Used for the decompressed data only.) 198 */ 199static void flush_window(void) 200{ 201 ulg c = crc; /* temporary variable */ 202 unsigned n; 203 uch *in, *out, ch; 204 205 in = window; 206 out = &output_data[output_ptr]; 207 for (n = 0; n < outcnt; n++) { 208 ch = *out++ = *in++; 209 c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8); 210 } 211 crc = c; 212 bytes_out += (ulg)outcnt; 213 output_ptr += (ulg)outcnt; 214 outcnt = 0; 215} 216 217static void error(char *x) 218{ 219 puts("\n\n"); 220 puts(x); 221 puts("\n\n -- System halted"); 222 223 while(1); /* Halt */ 224} 225 226#define STACK_SIZE (4096) 227long user_stack [STACK_SIZE]; 228long* stack_start = &user_stack[STACK_SIZE]; 229 230void decompress_kernel(void) 231{ 232 output_data = 0; 233 output_ptr = P2SEGADDR((unsigned long)&_text+PAGE_SIZE); 234 free_mem_ptr = (unsigned long)&_end; 235 free_mem_end_ptr = free_mem_ptr + HEAP_SIZE; 236 237 makecrc(); 238 puts("Uncompressing Linux... "); 239 gunzip(); 240 puts("Ok, booting the kernel.\n"); 241} 242