arch/cris/arch-v32/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 <hwregs/reg_rdwr.h>
  24 #include <hwregs/reg_map.h>
  25 #include <hwregs/ser_defs.h>
  26 #include <hwregs/pinmux_defs.h>
  27 #ifdef CONFIG_CRIS_MACH_ARTPEC3
  28 #include <hwregs/clkgen_defs.h>
  29 #endif
  30
  31 /*
  32  * gzip declarations
  33  */
  34
  35 #define OF(args)  args
  36 #define STATIC static
  37
  38 void* memset(void* s, int c, size_t n);
  39 void* memcpy(void* __dest, __const void* __src,
  40              size_t __n);
  41
  42 #define memzero(s, n)     memset ((s), 0, (n))
  43
  44
  45 typedef unsigned char  uch;
  46 typedef unsigned short ush;
  47 typedef unsigned long  ulg;
  48
  49 #define WSIZE 0x8000            /* Window size must be at least 32k, */
  50                                 /* and a power of two */
  51
  52 static uch *inbuf;           /* input buffer */
  53 static uch window[WSIZE];    /* Sliding window buffer */
  54
  55 unsigned inptr = 0;     /* index of next byte to be processed in inbuf
  56                          * After decompression it will contain the
  57                          * compressed size, and head.S will read it.
  58                          */
  59
  60 static unsigned outcnt = 0;  /* bytes in output buffer */
  61
  62 /* gzip flag byte */
  63 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
  64 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
  65 #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
  66 #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
  67 #define COMMENT      0x10 /* bit 4 set: file comment present */
  68 #define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
  69 #define RESERVED     0xC0 /* bit 6,7:   reserved */
  70
  71 #define get_byte() inbuf[inptr++]
  72
  73 /* Diagnostic functions */
  74 #ifdef DEBUG
  75 #  define Assert(cond,msg) {if(!(cond)) error(msg);}
  76 #  define Trace(x) fprintf x
  77 #  define Tracev(x) {if (verbose) fprintf x ;}
  78 #  define Tracevv(x) {if (verbose>1) fprintf x ;}
  79 #  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
  80 #  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
  81 #else
  82 #  define Assert(cond,msg)
  83 #  define Trace(x)
  84 #  define Tracev(x)
  85 #  define Tracevv(x)
  86 #  define Tracec(c,x)
  87 #  define Tracecv(c,x)
  88 #endif
  89
  90 static void flush_window(void);
  91 static void error(char *m);
  92 static void gzip_mark(void **);
  93 static void gzip_release(void **);
  94
  95 extern char *input_data;  /* lives in head.S */
  96
  97 static long bytes_out = 0;
  98 static uch *output_data;
  99 static unsigned long output_ptr = 0;
 100
 101 static void *malloc(int size);
 102 static void free(void *where);
 103 static void error(char *m);
 104 static void gzip_mark(void **);
 105 static void gzip_release(void **);
 106
 107 static void puts(const char *);
 108
 109 /* the "heap" is put directly after the BSS ends, at end */
 110
 111 extern int _end;
 112 static long free_mem_ptr = (long)&_end;
 113
 114 #include "../../../../../lib/inflate.c"
 115
 116 static void *malloc(int size)
 117 {
 118         void *p;
 119
 120         if (size <0) error("Malloc error");
 121
 122         free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
 123
 124         p = (void *)free_mem_ptr;
 125         free_mem_ptr += size;
 126
 127         return p;
 128 }
 129
 130 static void free(void *where)
 131 {       /* Don't care */
 132 }
 133
 134 static void gzip_mark(void **ptr)
 135 {
 136         *ptr = (void *) free_mem_ptr;
 137 }
 138
 139 static void gzip_release(void **ptr)
 140 {
 141         free_mem_ptr = (long) *ptr;
 142 }
 143
 144 /* decompressor info and error messages to serial console */
 145
 146 static inline void
 147 serout(const char *s, reg_scope_instances regi_ser)
 148 {
 149         reg_ser_rs_stat_din rs;
 150         reg_ser_rw_dout dout = {.data = *s};
 151
 152         do {
 153                 rs = REG_RD(ser, regi_ser, rs_stat_din);
 154         }
 155         while (!rs.tr_rdy);/* Wait for transceiver. */
 156
 157         REG_WR(ser, regi_ser, rw_dout, dout);
 158 }
 159
 160 static void
 161 puts(const char *s)
 162 {
 163 #ifndef CONFIG_ETRAX_DEBUG_PORT_NULL
 164         while (*s) {
 165 #ifdef CONFIG_ETRAX_DEBUG_PORT0
 166                 serout(s, regi_ser0);
 167 #endif
 168 #ifdef CONFIG_ETRAX_DEBUG_PORT1
 169                 serout(s, regi_ser1);
 170 #endif
 171 #ifdef CONFIG_ETRAX_DEBUG_PORT2
 172                 serout(s, regi_ser2);
 173 #endif
 174 #ifdef CONFIG_ETRAX_DEBUG_PORT3
 175                 serout(s, regi_ser3);
 176 #endif
 177                 *s++;
 178         }
 179 /* CONFIG_ETRAX_DEBUG_PORT_NULL */
 180 #endif
 181 }
 182
 183 void*
 184 memset(void* s, int c, size_t n)
 185 {
 186         int i;
 187         char *ss = (char*)s;
 188
 189         for (i=0;i<n;i++) ss[i] = c;
 190
 191         return s;
 192 }
 193
 194 void*
 195 memcpy(void* __dest, __const void* __src,
 196                             size_t __n)
 197 {
 198         int i;
 199         char *d = (char *)__dest, *s = (char *)__src;
 200
 201         for (i=0;i<__n;i++) d[i] = s[i];
 202
 203         return __dest;
 204 }
 205
 206 /* ===========================================================================
 207  * Write the output window window[0..outcnt-1] and update crc and bytes_out.
 208  * (Used for the decompressed data only.)
 209  */
 210
 211 static void
 212 flush_window()
 213 {
 214     ulg c = crc;         /* temporary variable */
 215     unsigned n;
 216     uch *in, *out, ch;
 217
 218     in = window;
 219     out = &output_data[output_ptr];
 220     for (n = 0; n < outcnt; n++) {
 221             ch = *out++ = *in++;
 222             c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
 223     }
 224     crc = c;
 225     bytes_out += (ulg)outcnt;
 226     output_ptr += (ulg)outcnt;
 227     outcnt = 0;
 228 }
 229
 230 static void
 231 error(char *x)
 232 {
 233         puts("\r\n\n");
 234         puts(x);
 235         puts("\r\n\n -- System halted\n");
 236
 237         while(1);       /* Halt */
 238 }
 239
 240 void
 241 setup_normal_output_buffer(void)
 242 {
 243         output_data = (char *)KERNEL_LOAD_ADR;
 244 }
 245
 246 static inline void
 247 serial_setup(reg_scope_instances regi_ser)
 248 {
 249         reg_ser_rw_xoff xoff;
 250         reg_ser_rw_tr_ctrl tr_ctrl;
 251         reg_ser_rw_rec_ctrl rec_ctrl;
 252         reg_ser_rw_tr_baud_div tr_baud;
 253         reg_ser_rw_rec_baud_div rec_baud;
 254
 255         /* Turn off XOFF. */
 256         xoff = REG_RD(ser, regi_ser, rw_xoff);
 257
 258         xoff.chr = 0;
 259         xoff.automatic = regk_ser_no;
 260
 261         REG_WR(ser, regi_ser, rw_xoff, xoff);
 262
 263         /* Set baudrate and stopbits. */
 264         tr_ctrl = REG_RD(ser, regi_ser, rw_tr_ctrl);
 265         rec_ctrl = REG_RD(ser, regi_ser, rw_rec_ctrl);
 266         tr_baud = REG_RD(ser, regi_ser, rw_tr_baud_div);
 267         rec_baud = REG_RD(ser, regi_ser, rw_rec_baud_div);
 268
 269         tr_ctrl.stop_bits = 1;  /* 2 stop bits. */
 270         tr_ctrl.en = 1; /* enable transmitter */
 271         rec_ctrl.en = 1; /* enabler receiver */
 272
 273         /*
 274          * The baudrate setup used to be a bit fishy, but now transmitter and
 275          * receiver are both set to the intended baud rate, 115200.
 276          * The magic value is 29.493 MHz.
 277          */
 278         tr_ctrl.base_freq = regk_ser_f29_493;
 279         rec_ctrl.base_freq = regk_ser_f29_493;
 280         tr_baud.div = (29493000 / 8) / 115200;
 281         rec_baud.div = (29493000 / 8) / 115200;
 282
 283         REG_WR(ser, regi_ser, rw_tr_ctrl, tr_ctrl);
 284         REG_WR(ser, regi_ser, rw_tr_baud_div, tr_baud);
 285         REG_WR(ser, regi_ser, rw_rec_ctrl, rec_ctrl);
 286         REG_WR(ser, regi_ser, rw_rec_baud_div, rec_baud);
 287 }
 288
 289 void
 290 decompress_kernel(void)
 291 {
 292         char revision;
 293
 294 #if defined(CONFIG_ETRAX_DEBUG_PORT1) || \
 295     defined(CONFIG_ETRAX_DEBUG_PORT2) || \
 296     defined(CONFIG_ETRAX_DEBUG_PORT3)
 297         reg_pinmux_rw_hwprot hwprot;
 298
 299 #ifdef CONFIG_CRIS_MACH_ARTPEC3
 300         reg_clkgen_rw_clk_ctrl clk_ctrl;
 301
 302         /* Enable corresponding clock region when serial 1..3 selected */
 303
 304         clk_ctrl = REG_RD(clkgen, regi_clkgen, rw_clk_ctrl);
 305         clk_ctrl.sser_ser_dma6_7 = regk_clkgen_yes;
 306         REG_WR(clkgen, regi_clkgen, rw_clk_ctrl, clk_ctrl);
 307 #endif
 308
 309         /* pinmux setup for ports 1..3 */
 310         hwprot = REG_RD(pinmux, regi_pinmux, rw_hwprot);
 311 #endif
 312
 313 #ifdef CONFIG_ETRAX_DEBUG_PORT0
 314         serial_setup(regi_ser0);
 315 #endif
 316 #ifdef CONFIG_ETRAX_DEBUG_PORT1
 317         hwprot.ser1 = regk_pinmux_yes;
 318         serial_setup(regi_ser1);
 319 #endif
 320 #ifdef CONFIG_ETRAX_DEBUG_PORT2
 321         hwprot.ser2 = regk_pinmux_yes;
 322         serial_setup(regi_ser2);
 323 #endif
 324 #ifdef CONFIG_ETRAX_DEBUG_PORT3
 325         hwprot.ser3 = regk_pinmux_yes;
 326         serial_setup(regi_ser3);
 327 #endif
 328 #if defined(CONFIG_ETRAX_DEBUG_PORT1) || \
 329     defined(CONFIG_ETRAX_DEBUG_PORT2) || \
 330     defined(CONFIG_ETRAX_DEBUG_PORT3)
 331         REG_WR(pinmux, regi_pinmux, rw_hwprot, hwprot);
 332 #endif
 333
 334         /* input_data is set in head.S */
 335         inbuf = input_data;
 336
 337         setup_normal_output_buffer();
 338
 339         makecrc();
 340
 341         __asm__ volatile ("move $vr,%0" : "=rm" (revision));
 342         if (revision < 32)
 343         {
 344                 puts("You need an ETRAX FS to run Linux 2.6/crisv32.\r\n");
 345                 while(1);
 346         }
 347
 348         puts("Uncompressing Linux...\r\n");
 349         gunzip();
 350         puts("Done. Now booting the kernel.\r\n");
 351 }