arch/cris/arch-v10/boot/compressed/misc.c

   1 /*
   2  * misc.c
   3  *
   4  * $Id: misc.c,v 1.6 2003/10/27 08:04:31 starvik Exp $
   5  *
   6  * This is a collection of several routines from gzip-1.0.3
   7  * adapted for Linux.
   8  *
   9  * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
  10  * puts by Nick Holloway 1993, better puts by Martin Mares 1995
  11  * adoptation for Linux/CRIS Axis Communications AB, 1999
  12  *
  13  */
  14
  15 /* where the piggybacked kernel image expects itself to live.
  16  * it is the same address we use when we network load an uncompressed
  17  * image into DRAM, and it is the address the kernel is linked to live
  18  * at by vmlinux.lds.S
  19  */
  20
  21 #define KERNEL_LOAD_ADR 0x40004000
  22
  23 #include <linux/config.h>
  24
  25 #include <linux/types.h>
  26 #include <asm/arch/svinto.h>
  27
  28 /*
  29  * gzip declarations
  30  */
  31
  32 #define OF(args)  args
  33 #define STATIC static
  34
  35 void* memset(void* s, int c, size_t n);
  36 void* memcpy(void* __dest, __const void* __src,
  37              size_t __n);
  38
  39 #define memzero(s, n)     memset ((s), 0, (n))
  40
  41
  42 typedef unsigned char  uch;
  43 typedef unsigned short ush;
  44 typedef unsigned long  ulg;
  45
  46 #define WSIZE 0x8000            /* Window size must be at least 32k, */
  47                                 /* and a power of two */
  48
  49 static uch *inbuf;           /* input buffer */
  50 static uch window[WSIZE];    /* Sliding window buffer */
  51
  52 unsigned inptr = 0;     /* index of next byte to be processed in inbuf
  53                          * After decompression it will contain the
  54                          * compressed size, and head.S will read it.
  55                          */
  56
  57 static unsigned outcnt = 0;  /* bytes in output buffer */
  58
  59 /* gzip flag byte */
  60 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
  61 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
  62 #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
  63 #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
  64 #define COMMENT      0x10 /* bit 4 set: file comment present */
  65 #define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
  66 #define RESERVED     0xC0 /* bit 6,7:   reserved */
  67
  68 #define get_byte() inbuf[inptr++]
  69
  70 /* Diagnostic functions */
  71 #ifdef DEBUG
  72 #  define Assert(cond,msg) {if(!(cond)) error(msg);}
  73 #  define Trace(x) fprintf x
  74 #  define Tracev(x) {if (verbose) fprintf x ;}
  75 #  define Tracevv(x) {if (verbose>1) fprintf x ;}
  76 #  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
  77 #  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
  78 #else
  79 #  define Assert(cond,msg)
  80 #  define Trace(x)
  81 #  define Tracev(x)
  82 #  define Tracevv(x)
  83 #  define Tracec(c,x)
  84 #  define Tracecv(c,x)
  85 #endif
  86
  87 static int  fill_inbuf(void);
  88 static void flush_window(void);
  89 static void error(char *m);
  90 static void gzip_mark(void **);
  91 static void gzip_release(void **);
  92
  93 extern char *input_data;  /* lives in head.S */
  94
  95 static long bytes_out = 0;
  96 static uch *output_data;
  97 static unsigned long output_ptr = 0;
  98
  99 static void *malloc(int size);
 100 static void free(void *where);
 101 static void error(char *m);
 102 static void gzip_mark(void **);
 103 static void gzip_release(void **);
 104
 105 static void puts(const char *);
 106
 107 /* the "heap" is put directly after the BSS ends, at end */
 108
 109 extern int end;
 110 static long free_mem_ptr = (long)&end;
 111
 112 #include "../../../../../lib/inflate.c"
 113
 114 static void *malloc(int size)
 115 {
 116         void *p;
 117
 118         if (size <0) error("Malloc error");
 119
 120         free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
 121
 122         p = (void *)free_mem_ptr;
 123         free_mem_ptr += size;
 124
 125         return p;
 126 }
 127
 128 static void free(void *where)
 129 {       /* Don't care */
 130 }
 131
 132 static void gzip_mark(void **ptr)
 133 {
 134         *ptr = (void *) free_mem_ptr;
 135 }
 136
 137 static void gzip_release(void **ptr)
 138 {
 139         free_mem_ptr = (long) *ptr;
 140 }
 141
 142 /* decompressor info and error messages to serial console */
 143
 144 static void
 145 puts(const char *s)
 146 {
 147 #ifndef CONFIG_ETRAX_DEBUG_PORT_NULL
 148         while(*s) {
 149 #ifdef CONFIG_ETRAX_DEBUG_PORT0
 150                 while(!(*R_SERIAL0_STATUS & (1 << 5))) ;
 151                 *R_SERIAL0_TR_DATA = *s++;
 152 #endif
 153 #ifdef CONFIG_ETRAX_DEBUG_PORT1
 154                 while(!(*R_SERIAL1_STATUS & (1 << 5))) ;
 155                 *R_SERIAL1_TR_DATA = *s++;
 156 #endif
 157 #ifdef CONFIG_ETRAX_DEBUG_PORT2
 158                 while(!(*R_SERIAL2_STATUS & (1 << 5))) ;
 159                 *R_SERIAL2_TR_DATA = *s++;
 160 #endif
 161 #ifdef CONFIG_ETRAX_DEBUG_PORT3
 162                 while(!(*R_SERIAL3_STATUS & (1 << 5))) ;
 163                 *R_SERIAL3_TR_DATA = *s++;
 164 #endif
 165         }
 166 #endif
 167 }
 168
 169 void*
 170 memset(void* s, int c, size_t n)
 171 {
 172         int i;
 173         char *ss = (char*)s;
 174
 175         for (i=0;i<n;i++) ss[i] = c;
 176 }
 177
 178 void*
 179 memcpy(void* __dest, __const void* __src,
 180                             size_t __n)
 181 {
 182         int i;
 183         char *d = (char *)__dest, *s = (char *)__src;
 184
 185         for (i=0;i<__n;i++) d[i] = s[i];
 186 }
 187
 188 /* ===========================================================================
 189  * Write the output window window[0..outcnt-1] and update crc and bytes_out.
 190  * (Used for the decompressed data only.)
 191  */
 192
 193 static void
 194 flush_window()
 195 {
 196     ulg c = crc;         /* temporary variable */
 197     unsigned n;
 198     uch *in, *out, ch;
 199
 200     in = window;
 201     out = &output_data[output_ptr];
 202     for (n = 0; n < outcnt; n++) {
 203             ch = *out++ = *in++;
 204             c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
 205     }
 206     crc = c;
 207     bytes_out += (ulg)outcnt;
 208     output_ptr += (ulg)outcnt;
 209     outcnt = 0;
 210 }
 211
 212 static void
 213 error(char *x)
 214 {
 215         puts("\n\n");
 216         puts(x);
 217         puts("\n\n -- System halted\n");
 218
 219         while(1);       /* Halt */
 220 }
 221
 222 void
 223 setup_normal_output_buffer()
 224 {
 225         output_data = (char *)KERNEL_LOAD_ADR;
 226 }
 227
 228 void
 229 decompress_kernel()
 230 {
 231         char revision;
 232
 233         /* input_data is set in head.S */
 234         inbuf = input_data;
 235
 236 #ifdef CONFIG_ETRAX_DEBUG_PORT0
 237         *R_SERIAL0_XOFF = 0;
 238         *R_SERIAL0_BAUD = 0x99;
 239         *R_SERIAL0_TR_CTRL = 0x40;
 240 #endif
 241 #ifdef CONFIG_ETRAX_DEBUG_PORT1
 242         *R_SERIAL1_XOFF = 0;
 243         *R_SERIAL1_BAUD = 0x99;
 244         *R_SERIAL1_TR_CTRL = 0x40;
 245 #endif
 246 #ifdef CONFIG_ETRAX_DEBUG_PORT2
 247         *R_GEN_CONFIG = 0x08;
 248         *R_SERIAL2_XOFF = 0;
 249         *R_SERIAL2_BAUD = 0x99;
 250         *R_SERIAL2_TR_CTRL = 0x40;
 251 #endif
 252 #ifdef CONFIG_ETRAX_DEBUG_PORT3
 253         *R_GEN_CONFIG = 0x100;
 254         *R_SERIAL3_XOFF = 0;
 255         *R_SERIAL3_BAUD = 0x99;
 256         *R_SERIAL3_TR_CTRL = 0x40;
 257 #endif
 258
 259         setup_normal_output_buffer();
 260
 261         makecrc();
 262
 263         __asm__ volatile ("move vr,%0" : "=rm" (revision));
 264         if (revision < 10)
 265         {
 266                 puts("You need an ETRAX 100LX to run linux 2.6\n");
 267                 while(1);
 268         }
 269
 270         puts("Uncompressing Linux...\n");
 271         gunzip();
 272         puts("Done. Now booting the kernel.\n");
 273 }