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