arch/mn10300/boot/compressed/misc.c

   1 /* MN10300 Miscellaneous helper routines for kernel decompressor
   2  *
   3  * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
   4  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   5  * Modified by David Howells (dhowells@redhat.com)
   6  * - Derived from arch/x86/boot/compressed/misc_32.c
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public Licence
  10  * as published by the Free Software Foundation; either version
  11  * 2 of the Licence, or (at your option) any later version.
  12  */
  13 #include <linux/compiler.h>
  14 #include <asm/serial-regs.h>
  15 #include "misc.h"
  16
  17 #ifndef CONFIG_GDBSTUB_ON_TTYSx
  18 /* display 'Uncompressing Linux... ' messages on ttyS0 or ttyS1 */
  19 #if 1   /* ttyS0 */
  20 #define CYG_DEV_BASE    0xA6FB0000
  21 #else   /* ttyS1 */
  22 #define CYG_DEV_BASE    0xA6FC0000
  23 #endif
  24
  25 #define CYG_DEV_THR     (*((volatile __u8*)(CYG_DEV_BASE + 0x00)))
  26 #define CYG_DEV_MCR     (*((volatile __u8*)(CYG_DEV_BASE + 0x10)))
  27 #define SIO_MCR_DTR     0x01
  28 #define SIO_MCR_RTS     0x02
  29 #define CYG_DEV_LSR     (*((volatile __u8*)(CYG_DEV_BASE + 0x14)))
  30 #define SIO_LSR_THRE    0x20            /* transmitter holding register empty */
  31 #define SIO_LSR_TEMT    0x40            /* transmitter register empty */
  32 #define CYG_DEV_MSR     (*((volatile __u8*)(CYG_DEV_BASE + 0x18)))
  33 #define SIO_MSR_CTS     0x10            /* clear to send */
  34 #define SIO_MSR_DSR     0x20            /* data set ready */
  35
  36 #define LSR_WAIT_FOR(STATE) \
  37         do { while (!(CYG_DEV_LSR & SIO_LSR_##STATE)) {} } while (0)
  38 #define FLOWCTL_QUERY(LINE) \
  39         ({ CYG_DEV_MSR & SIO_MSR_##LINE; })
  40 #define FLOWCTL_WAIT_FOR(LINE) \
  41         do { while (!(CYG_DEV_MSR & SIO_MSR_##LINE)) {} } while (0)
  42 #define FLOWCTL_CLEAR(LINE) \
  43         do { CYG_DEV_MCR &= ~SIO_MCR_##LINE; } while (0)
  44 #define FLOWCTL_SET(LINE) \
  45         do { CYG_DEV_MCR |= SIO_MCR_##LINE; } while (0)
  46 #endif
  47
  48 /*
  49  * gzip declarations
  50  */
  51
  52 #define OF(args)  args
  53 #define STATIC static
  54
  55 #undef memset
  56 #undef memcpy
  57
  58 static inline void *memset(const void *s, int c, size_t n)
  59 {
  60         int i;
  61         char *ss = (char *) s;
  62
  63         for (i = 0; i < n; i++)
  64                 ss[i] = c;
  65         return (void *)s;
  66 }
  67
  68 #define memzero(s, n) memset((s), 0, (n))
  69
  70 static inline void *memcpy(void *__dest, const void *__src, size_t __n)
  71 {
  72         int i;
  73         const char *s = __src;
  74         char *d = __dest;
  75
  76         for (i = 0; i < __n; i++)
  77                 d[i] = s[i];
  78         return __dest;
  79 }
  80
  81 typedef unsigned char  uch;
  82 typedef unsigned short ush;
  83 typedef unsigned long  ulg;
  84
  85 #define WSIZE 0x8000    /* Window size must be at least 32k, and a power of
  86                          * two */
  87
  88 static uch *inbuf;      /* input buffer */
  89 static uch window[WSIZE]; /* sliding window buffer */
  90
  91 static unsigned insize; /* valid bytes in inbuf */
  92 static unsigned inptr;  /* index of next byte to be processed in inbuf */
  93 static unsigned outcnt; /* bytes in output buffer */
  94
  95 /* gzip flag byte */
  96 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ASCII text */
  97 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
  98 #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
  99 #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
 100 #define COMMENT      0x10 /* bit 4 set: file comment present */
 101 #define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
 102 #define RESERVED     0xC0 /* bit 6,7:   reserved */
 103
 104 /* Diagnostic functions */
 105 #ifdef DEBUG
 106 #  define Assert(cond, msg) { if (!(cond)) error(msg); }
 107 #  define Trace(x)      fprintf x
 108 #  define Tracev(x)     { if (verbose) fprintf x ; }
 109 #  define Tracevv(x)    { if (verbose > 1) fprintf x ; }
 110 #  define Tracec(c, x)  { if (verbose && (c)) fprintf x ; }
 111 #  define Tracecv(c, x) { if (verbose > 1 && (c)) fprintf x ; }
 112 #else
 113 #  define Assert(cond, msg)
 114 #  define Trace(x)
 115 #  define Tracev(x)
 116 #  define Tracevv(x)
 117 #  define Tracec(c, x)
 118 #  define Tracecv(c, x)
 119 #endif
 120
 121 static int  fill_inbuf(void);
 122 static void flush_window(void);
 123 static void error(const char *) __attribute__((noreturn));
 124 static void kputs(const char *);
 125
 126 static inline unsigned char get_byte(void)
 127 {
 128         unsigned char ch = inptr < insize ? inbuf[inptr++] : fill_inbuf();
 129
 130 #if 0
 131         char hex[3];
 132         hex[0] = ((ch & 0x0f) > 9) ?
 133                 ((ch & 0x0f) + 'A' - 0xa) : ((ch & 0x0f) + '0');
 134         hex[1] = ((ch >> 4) > 9) ?
 135                 ((ch >> 4) + 'A' - 0xa) : ((ch >> 4) + '0');
 136         hex[2] = 0;
 137         kputs(hex);
 138 #endif
 139         return ch;
 140 }
 141
 142 /*
 143  * This is set up by the setup-routine at boot-time
 144  */
 145 #define EXT_MEM_K (*(unsigned short *)0x90002)
 146 #ifndef STANDARD_MEMORY_BIOS_CALL
 147 #define ALT_MEM_K (*(unsigned long *) 0x901e0)
 148 #endif
 149 #define SCREEN_INFO (*(struct screen_info *)0x90000)
 150
 151 static long bytes_out;
 152 static uch *output_data;
 153 static unsigned long output_ptr;
 154
 155
 156 static void *malloc(int size);
 157
 158 static inline void free(void *where)
 159 {       /* Don't care */
 160 }
 161
 162 static unsigned long free_mem_ptr = (unsigned long) &end;
 163 static unsigned long free_mem_end_ptr = (unsigned long) &end + 0x90000;
 164
 165 static inline void gzip_mark(void **ptr)
 166 {
 167         kputs(".");
 168         *ptr = (void *) free_mem_ptr;
 169 }
 170
 171 static inline void gzip_release(void **ptr)
 172 {
 173         free_mem_ptr = (unsigned long) *ptr;
 174 }
 175
 176 #define INPLACE_MOVE_ROUTINE    0x1000
 177 #define LOW_BUFFER_START        0x2000
 178 #define LOW_BUFFER_END          0x90000
 179 #define LOW_BUFFER_SIZE         (LOW_BUFFER_END - LOW_BUFFER_START)
 180 #define HEAP_SIZE               0x3000
 181 static int high_loaded;
 182 static uch *high_buffer_start /* = (uch *)(((ulg)&end) + HEAP_SIZE)*/;
 183
 184 static char *vidmem = (char *)0xb8000;
 185 static int lines, cols;
 186
 187 #include "../../../../lib/inflate.c"
 188
 189 static void *malloc(int size)
 190 {
 191         void *p;
 192
 193         if (size < 0)
 194                 error("Malloc error\n");
 195         if (!free_mem_ptr)
 196                 error("Memory error\n");
 197
 198         free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
 199
 200         p = (void *) free_mem_ptr;
 201         free_mem_ptr += size;
 202
 203         if (free_mem_ptr >= free_mem_end_ptr)
 204                 error("\nOut of memory\n");
 205
 206         return p;
 207 }
 208
 209 static inline void scroll(void)
 210 {
 211         int i;
 212
 213         memcpy(vidmem, vidmem + cols * 2, (lines - 1) * cols * 2);
 214         for (i = (lines - 1) * cols * 2; i < lines * cols * 2; i += 2)
 215                 vidmem[i] = ' ';
 216 }
 217
 218 static inline void kputchar(unsigned char ch)
 219 {
 220 #ifdef CONFIG_MN10300_UNIT_ASB2305
 221         while (SC0STR & SC01STR_TBF)
 222                 continue;
 223
 224         if (ch == 0x0a) {
 225                 SC0TXB = 0x0d;
 226                 while (SC0STR & SC01STR_TBF)
 227                         continue;
 228         }
 229
 230         SC0TXB = ch;
 231
 232 #else
 233         while (SC1STR & SC01STR_TBF)
 234                 continue;
 235
 236         if (ch == 0x0a) {
 237                 SC1TXB = 0x0d;
 238                 while (SC1STR & SC01STR_TBF)
 239                         continue;
 240         }
 241
 242         SC1TXB = ch;
 243
 244 #endif
 245 }
 246
 247 static void kputs(const char *s)
 248 {
 249 #ifdef CONFIG_DEBUG_DECOMPRESS_KERNEL
 250 #ifndef CONFIG_GDBSTUB_ON_TTYSx
 251         char ch;
 252
 253         FLOWCTL_SET(DTR);
 254
 255         while (*s) {
 256                 LSR_WAIT_FOR(THRE);
 257
 258                 ch = *s++;
 259                 if (ch == 0x0a) {
 260                         CYG_DEV_THR = 0x0d;
 261                         LSR_WAIT_FOR(THRE);
 262                 }
 263                 CYG_DEV_THR = ch;
 264         }
 265
 266         FLOWCTL_CLEAR(DTR);
 267 #else
 268
 269         for (; *s; s++)
 270                 kputchar(*s);
 271
 272 #endif
 273 #endif /* CONFIG_DEBUG_DECOMPRESS_KERNEL */
 274 }
 275
 276 /* ===========================================================================
 277  * Fill the input buffer. This is called only when the buffer is empty
 278  * and at least one byte is really needed.
 279  */
 280 static int fill_inbuf()
 281 {
 282         if (insize != 0)
 283                 error("ran out of input data\n");
 284
 285         inbuf = input_data;
 286         insize = input_len;
 287         inptr = 1;
 288         return inbuf[0];
 289 }
 290
 291 /* ===========================================================================
 292  * Write the output window window[0..outcnt-1] and update crc and bytes_out.
 293  * (Used for the decompressed data only.)
 294  */
 295 static void flush_window_low(void)
 296 {
 297     ulg c = crc;         /* temporary variable */
 298     unsigned n;
 299     uch *in, *out, ch;
 300
 301     in = window;
 302     out = &output_data[output_ptr];
 303     for (n = 0; n < outcnt; n++) {
 304             ch = *out++ = *in++;
 305             c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
 306     }
 307     crc = c;
 308     bytes_out += (ulg)outcnt;
 309     output_ptr += (ulg)outcnt;
 310     outcnt = 0;
 311 }
 312
 313 static void flush_window_high(void)
 314 {
 315     ulg c = crc;         /* temporary variable */
 316     unsigned n;
 317     uch *in,  ch;
 318     in = window;
 319     for (n = 0; n < outcnt; n++) {
 320         ch = *output_data++ = *in++;
 321         if ((ulg) output_data == LOW_BUFFER_END)
 322                 output_data = high_buffer_start;
 323         c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
 324     }
 325     crc = c;
 326     bytes_out += (ulg)outcnt;
 327     outcnt = 0;
 328 }
 329
 330 static void flush_window(void)
 331 {
 332         if (high_loaded)
 333                 flush_window_high();
 334         else
 335                 flush_window_low();
 336 }
 337
 338 static void error(const char *x)
 339 {
 340         kputs("\n\n");
 341         kputs(x);
 342         kputs("\n\n -- System halted");
 343
 344         while (1)
 345                 /* Halt */;
 346 }
 347
 348 #define STACK_SIZE (4096)
 349
 350 long user_stack[STACK_SIZE];
 351
 352 struct {
 353         long *a;
 354         short b;
 355 } stack_start = { &user_stack[STACK_SIZE], 0 };
 356
 357 void setup_normal_output_buffer(void)
 358 {
 359 #ifdef STANDARD_MEMORY_BIOS_CALL
 360         if (EXT_MEM_K < 1024)
 361                 error("Less than 2MB of memory.\n");
 362 #else
 363         if ((ALT_MEM_K > EXT_MEM_K ? ALT_MEM_K : EXT_MEM_K) < 1024)
 364                 error("Less than 2MB of memory.\n");
 365 #endif
 366         output_data = (char *) 0x100000; /* Points to 1M */
 367 }
 368
 369 struct moveparams {
 370         uch *low_buffer_start;
 371         int lcount;
 372         uch *high_buffer_start;
 373         int hcount;
 374 };
 375
 376 void setup_output_buffer_if_we_run_high(struct moveparams *mv)
 377 {
 378         high_buffer_start = (uch *)(((ulg) &end) + HEAP_SIZE);
 379 #ifdef STANDARD_MEMORY_BIOS_CALL
 380         if (EXT_MEM_K < (3 * 1024))
 381                 error("Less than 4MB of memory.\n");
 382 #else
 383         if ((ALT_MEM_K > EXT_MEM_K ? ALT_MEM_K : EXT_MEM_K) < (3 * 1024))
 384                 error("Less than 4MB of memory.\n");
 385 #endif
 386         mv->low_buffer_start = output_data = (char *) LOW_BUFFER_START;
 387         high_loaded = 1;
 388         free_mem_end_ptr = (long) high_buffer_start;
 389         if (0x100000 + LOW_BUFFER_SIZE > (ulg) high_buffer_start) {
 390                 high_buffer_start = (uch *)(0x100000 + LOW_BUFFER_SIZE);
 391                 mv->hcount = 0; /* say: we need not to move high_buffer */
 392         } else {
 393                 mv->hcount = -1;
 394         }
 395         mv->high_buffer_start = high_buffer_start;
 396 }
 397
 398 void close_output_buffer_if_we_run_high(struct moveparams *mv)
 399 {
 400         mv->lcount = bytes_out;
 401         if (bytes_out > LOW_BUFFER_SIZE) {
 402                 mv->lcount = LOW_BUFFER_SIZE;
 403                 if (mv->hcount)
 404                         mv->hcount = bytes_out - LOW_BUFFER_SIZE;
 405         } else {
 406                 mv->hcount = 0;
 407         }
 408 }
 409
 410 #undef DEBUGFLAG
 411 #ifdef DEBUGFLAG
 412 int debugflag;
 413 #endif
 414
 415 int decompress_kernel(struct moveparams *mv)
 416 {
 417 #ifdef DEBUGFLAG
 418         while (!debugflag)
 419                 barrier();
 420 #endif
 421
 422         output_data = (char *) CONFIG_KERNEL_TEXT_ADDRESS;
 423
 424         makecrc();
 425         kputs("Uncompressing Linux... ");
 426         gunzip();
 427         kputs("Ok, booting the kernel.\n");
 428         return 0;
 429 }