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 unsigned long free_mem_ptr = (unsigned long) &end;
 157 static unsigned long free_mem_end_ptr = (unsigned long) &end + 0x90000;
 158
 159 #define INPLACE_MOVE_ROUTINE    0x1000
 160 #define LOW_BUFFER_START        0x2000
 161 #define LOW_BUFFER_END          0x90000
 162 #define LOW_BUFFER_SIZE         (LOW_BUFFER_END - LOW_BUFFER_START)
 163 #define HEAP_SIZE               0x3000
 164 static int high_loaded;
 165 static uch *high_buffer_start /* = (uch *)(((ulg)&end) + HEAP_SIZE)*/;
 166
 167 static char *vidmem = (char *)0xb8000;
 168 static int lines, cols;
 169
 170 #define BOOTLOADER_INFLATE
 171 #include "../../../../lib/inflate.c"
 172
 173 static inline void scroll(void)
 174 {
 175         int i;
 176
 177         memcpy(vidmem, vidmem + cols * 2, (lines - 1) * cols * 2);
 178         for (i = (lines - 1) * cols * 2; i < lines * cols * 2; i += 2)
 179                 vidmem[i] = ' ';
 180 }
 181
 182 static inline void kputchar(unsigned char ch)
 183 {
 184 #ifdef CONFIG_MN10300_UNIT_ASB2305
 185         while (SC0STR & SC01STR_TBF)
 186                 continue;
 187
 188         if (ch == 0x0a) {
 189                 SC0TXB = 0x0d;
 190                 while (SC0STR & SC01STR_TBF)
 191                         continue;
 192         }
 193
 194         SC0TXB = ch;
 195
 196 #else
 197         while (SC1STR & SC01STR_TBF)
 198                 continue;
 199
 200         if (ch == 0x0a) {
 201                 SC1TXB = 0x0d;
 202                 while (SC1STR & SC01STR_TBF)
 203                         continue;
 204         }
 205
 206         SC1TXB = ch;
 207
 208 #endif
 209 }
 210
 211 static void kputs(const char *s)
 212 {
 213 #ifdef CONFIG_DEBUG_DECOMPRESS_KERNEL
 214 #ifndef CONFIG_GDBSTUB_ON_TTYSx
 215         char ch;
 216
 217         FLOWCTL_SET(DTR);
 218
 219         while (*s) {
 220                 LSR_WAIT_FOR(THRE);
 221
 222                 ch = *s++;
 223                 if (ch == 0x0a) {
 224                         CYG_DEV_THR = 0x0d;
 225                         LSR_WAIT_FOR(THRE);
 226                 }
 227                 CYG_DEV_THR = ch;
 228         }
 229
 230         FLOWCTL_CLEAR(DTR);
 231 #else
 232
 233         for (; *s; s++)
 234                 kputchar(*s);
 235
 236 #endif
 237 #endif /* CONFIG_DEBUG_DECOMPRESS_KERNEL */
 238 }
 239
 240 /* ===========================================================================
 241  * Fill the input buffer. This is called only when the buffer is empty
 242  * and at least one byte is really needed.
 243  */
 244 static int fill_inbuf()
 245 {
 246         if (insize != 0)
 247                 error("ran out of input data\n");
 248
 249         inbuf = input_data;
 250         insize = input_len;
 251         inptr = 1;
 252         return inbuf[0];
 253 }
 254
 255 /* ===========================================================================
 256  * Write the output window window[0..outcnt-1] and update crc and bytes_out.
 257  * (Used for the decompressed data only.)
 258  */
 259 static void flush_window_low(void)
 260 {
 261     ulg c = crc;         /* temporary variable */
 262     unsigned n;
 263     uch *in, *out, ch;
 264
 265     in = window;
 266     out = &output_data[output_ptr];
 267     for (n = 0; n < outcnt; n++) {
 268             ch = *out++ = *in++;
 269             c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
 270     }
 271     crc = c;
 272     bytes_out += (ulg)outcnt;
 273     output_ptr += (ulg)outcnt;
 274     outcnt = 0;
 275 }
 276
 277 static void flush_window_high(void)
 278 {
 279     ulg c = crc;         /* temporary variable */
 280     unsigned n;
 281     uch *in,  ch;
 282     in = window;
 283     for (n = 0; n < outcnt; n++) {
 284         ch = *output_data++ = *in++;
 285         if ((ulg) output_data == LOW_BUFFER_END)
 286                 output_data = high_buffer_start;
 287         c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
 288     }
 289     crc = c;
 290     bytes_out += (ulg)outcnt;
 291     outcnt = 0;
 292 }
 293
 294 static void flush_window(void)
 295 {
 296         if (high_loaded)
 297                 flush_window_high();
 298         else
 299                 flush_window_low();
 300 }
 301
 302 static void error(const char *x)
 303 {
 304         kputs("\n\n");
 305         kputs(x);
 306         kputs("\n\n -- System halted");
 307
 308         while (1)
 309                 /* Halt */;
 310 }
 311
 312 #define STACK_SIZE (4096)
 313
 314 long user_stack[STACK_SIZE];
 315
 316 struct {
 317         long *a;
 318         short b;
 319 } stack_start = { &user_stack[STACK_SIZE], 0 };
 320
 321 void setup_normal_output_buffer(void)
 322 {
 323 #ifdef STANDARD_MEMORY_BIOS_CALL
 324         if (EXT_MEM_K < 1024)
 325                 error("Less than 2MB of memory.\n");
 326 #else
 327         if ((ALT_MEM_K > EXT_MEM_K ? ALT_MEM_K : EXT_MEM_K) < 1024)
 328                 error("Less than 2MB of memory.\n");
 329 #endif
 330         output_data = (char *) 0x100000; /* Points to 1M */
 331 }
 332
 333 struct moveparams {
 334         uch *low_buffer_start;
 335         int lcount;
 336         uch *high_buffer_start;
 337         int hcount;
 338 };
 339
 340 void setup_output_buffer_if_we_run_high(struct moveparams *mv)
 341 {
 342         high_buffer_start = (uch *)(((ulg) &end) + HEAP_SIZE);
 343 #ifdef STANDARD_MEMORY_BIOS_CALL
 344         if (EXT_MEM_K < (3 * 1024))
 345                 error("Less than 4MB of memory.\n");
 346 #else
 347         if ((ALT_MEM_K > EXT_MEM_K ? ALT_MEM_K : EXT_MEM_K) < (3 * 1024))
 348                 error("Less than 4MB of memory.\n");
 349 #endif
 350         mv->low_buffer_start = output_data = (char *) LOW_BUFFER_START;
 351         high_loaded = 1;
 352         free_mem_end_ptr = (long) high_buffer_start;
 353         if (0x100000 + LOW_BUFFER_SIZE > (ulg) high_buffer_start) {
 354                 high_buffer_start = (uch *)(0x100000 + LOW_BUFFER_SIZE);
 355                 mv->hcount = 0; /* say: we need not to move high_buffer */
 356         } else {
 357                 mv->hcount = -1;
 358         }
 359         mv->high_buffer_start = high_buffer_start;
 360 }
 361
 362 void close_output_buffer_if_we_run_high(struct moveparams *mv)
 363 {
 364         mv->lcount = bytes_out;
 365         if (bytes_out > LOW_BUFFER_SIZE) {
 366                 mv->lcount = LOW_BUFFER_SIZE;
 367                 if (mv->hcount)
 368                         mv->hcount = bytes_out - LOW_BUFFER_SIZE;
 369         } else {
 370                 mv->hcount = 0;
 371         }
 372 }
 373
 374 #undef DEBUGFLAG
 375 #ifdef DEBUGFLAG
 376 int debugflag;
 377 #endif
 378
 379 int decompress_kernel(struct moveparams *mv)
 380 {
 381 #ifdef DEBUGFLAG
 382         while (!debugflag)
 383                 barrier();
 384 #endif
 385
 386         output_data = (char *) CONFIG_KERNEL_TEXT_ADDRESS;
 387
 388         makecrc();
 389         kputs("Uncompressing Linux... ");
 390         gunzip();
 391         kputs("Ok, booting the kernel.\n");
 392         return 0;
 393 }