arch/sh/boot/compressed/misc.c

   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
  32 typedef unsigned char  uch;
  33 typedef unsigned short ush;
  34 typedef unsigned long  ulg;
  35
  36 #define WSIZE 0x8000            /* Window size must be at least 32k, */
  37                                 /* and a power of two */
  38
  39 static uch *inbuf;           /* input buffer */
  40 static uch window[WSIZE];    /* Sliding window buffer */
  41
  42 static unsigned insize = 0;  /* valid bytes in inbuf */
  43 static unsigned inptr = 0;   /* index of next byte to be processed in inbuf */
  44 static 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
  74 static int  fill_inbuf(void);
  75 static void flush_window(void);
  76 static void error(char *m);
  77 static void gzip_mark(void **);
  78 static void gzip_release(void **);
  79
  80 extern char input_data[];
  81 extern int input_len;
  82
  83 static long bytes_out = 0;
  84 static uch *output_data;
  85 static unsigned long output_ptr = 0;
  86
  87 static void *malloc(int size);
  88 static void free(void *where);
  89 static void error(char *m);
  90 static void gzip_mark(void **);
  91 static void gzip_release(void **);
  92
  93 int puts(const char *);
  94
  95 extern int _text;               /* Defined in vmlinux.lds.S */
  96 extern int _end;
  97 static unsigned long free_mem_ptr;
  98 static unsigned long free_mem_end_ptr;
  99
 100 #define HEAP_SIZE             0x10000
 101
 102 #include "../../../../lib/inflate.c"
 103
 104 static 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
 122 static void free(void *where)
 123 {       /* Don't care */
 124 }
 125
 126 static void gzip_mark(void **ptr)
 127 {
 128         *ptr = (void *) free_mem_ptr;
 129 }
 130
 131 static void gzip_release(void **ptr)
 132 {
 133         free_mem_ptr = (long) *ptr;
 134 }
 135
 136 #ifdef CONFIG_SH_STANDARD_BIOS
 137 size_t strlen(const char *s)
 138 {
 139         int i = 0;
 140
 141         while (*s++)
 142                 i++;
 143         return i;
 144 }
 145
 146 int puts(const char *s)
 147 {
 148         int len = strlen(s);
 149         sh_bios_console_write(s, len);
 150         return len;
 151 }
 152 #else
 153 int puts(const char *s)
 154 {
 155         /* This should be updated to use the sh-sci routines */
 156         return 0;
 157 }
 158 #endif
 159
 160 void* 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
 169 void* 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  */
 183 static 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  */
 199 static 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
 217 static 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)
 227 long user_stack [STACK_SIZE];
 228 long* stack_start = &user_stack[STACK_SIZE];
 229
 230 void 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 }