LXR linux/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
  38void* memset(void* s, int c, size_t n);
  39void* memcpy(void* __dest, __const void* __src,
  40             size_t __n);
  41
  42#define memzero(s, n)     memset ((s), 0, (n))
  43
  44
  45typedef unsigned char  uch;
  46typedef unsigned short ush;
  47typedef unsigned long  ulg;
  48
  49#define WSIZE 0x8000            /* Window size must be at least 32k, */
  50                                /* and a power of two */
  51
  52static uch *inbuf;           /* input buffer */
  53static uch window[WSIZE];    /* Sliding window buffer */
  54
  55unsigned 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
  60static 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
  90static void flush_window(void);
  91static void error(char *m);
  92static void gzip_mark(void **);
  93static void gzip_release(void **);
  94
  95extern char *input_data;  /* lives in head.S */
  96
  97static long bytes_out = 0;
  98static uch *output_data;
  99static unsigned long output_ptr = 0;
 100
 101static void *malloc(int size);
 102static void free(void *where);
 103static void error(char *m);
 104static void gzip_mark(void **);
 105static void gzip_release(void **);
 106
 107static void puts(const char *);
 108
 109/* the "heap" is put directly after the BSS ends, at end */
 110
 111extern int _end;
 112static long free_mem_ptr = (long)&_end;
 113
 114#include "../../../../../lib/inflate.c"
 115
 116static 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
 130static void free(void *where)
 131{       /* Don't care */
 132}
 133
 134static void gzip_mark(void **ptr)
 135{
 136        *ptr = (void *) free_mem_ptr;
 137}
 138
 139static void gzip_release(void **ptr)
 140{
 141        free_mem_ptr = (long) *ptr;
 142}
 143
 144/* decompressor info and error messages to serial console */
 145
 146static inline void
 147serout(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
 160static void
 161puts(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
 183void*
 184memset(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
 194void*
 195memcpy(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
 211static void
 212flush_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
 230static void
 231error(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
 240void
 241setup_normal_output_buffer(void)
 242{
 243        output_data = (char *)KERNEL_LOAD_ADR;
 244}
 245
 246static inline void
 247serial_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
 289void
 290decompress_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}
 352