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

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