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);
  92
  93extern char *input_data;  /* lives in head.S */
  94
  95static long bytes_out;
  96static uch *output_data;
  97static unsigned long output_ptr;
  98
  99static void error(char *m);
 100
 101static void puts(const char *);
 102
 103/* the "heap" is put directly after the BSS ends, at end */
 104
 105extern int _end;
 106static long free_mem_ptr = (long)&_end;
 107static long free_mem_end_ptr;
 108
 109#include "../../../../../lib/inflate.c"
 110
 111/* decompressor info and error messages to serial console */
 112
 113static inline void
 114serout(const char *s, reg_scope_instances regi_ser)
 115{
 116        reg_ser_rs_stat_din rs;
 117        reg_ser_rw_dout dout = {.data = *s};
 118
 119        do {
 120                rs = REG_RD(ser, regi_ser, rs_stat_din);
 121        }
 122        while (!rs.tr_rdy);/* Wait for transceiver. */
 123
 124        REG_WR(ser, regi_ser, rw_dout, dout);
 125}
 126
 127static void
 128puts(const char *s)
 129{
 130#ifndef CONFIG_ETRAX_DEBUG_PORT_NULL
 131        while (*s) {
 132#ifdef CONFIG_ETRAX_DEBUG_PORT0
 133                serout(s, regi_ser0);
 134#endif
 135#ifdef CONFIG_ETRAX_DEBUG_PORT1
 136                serout(s, regi_ser1);
 137#endif
 138#ifdef CONFIG_ETRAX_DEBUG_PORT2
 139                serout(s, regi_ser2);
 140#endif
 141#ifdef CONFIG_ETRAX_DEBUG_PORT3
 142                serout(s, regi_ser3);
 143#endif
 144                *s++;
 145        }
 146/* CONFIG_ETRAX_DEBUG_PORT_NULL */
 147#endif
 148}
 149
 150void*
 151memset(void* s, int c, size_t n)
 152{
 153        int i;
 154        char *ss = (char*)s;
 155
 156        for (i=0;i<n;i++) ss[i] = c;
 157
 158        return s;
 159}
 160
 161void*
 162memcpy(void* __dest, __const void* __src,
 163                            size_t __n)
 164{
 165        int i;
 166        char *d = (char *)__dest, *s = (char *)__src;
 167
 168        for (i=0;i<__n;i++) d[i] = s[i];
 169
 170        return __dest;
 171}
 172
 173/* ===========================================================================
 174 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
 175 * (Used for the decompressed data only.)
 176 */
 177
 178static void
 179flush_window()
 180{
 181    ulg c = crc;         /* temporary variable */
 182    unsigned n;
 183    uch *in, *out, ch;
 184
 185    in = window;
 186    out = &output_data[output_ptr];
 187    for (n = 0; n < outcnt; n++) {
 188            ch = *out++ = *in++;
 189            c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
 190    }
 191    crc = c;
 192    bytes_out += (ulg)outcnt;
 193    output_ptr += (ulg)outcnt;
 194    outcnt = 0;
 195}
 196
 197static void
 198error(char *x)
 199{
 200        puts("\r\n\n");
 201        puts(x);
 202        puts("\r\n\n -- System halted\n");
 203
 204        while(1);       /* Halt */
 205}
 206
 207void
 208setup_normal_output_buffer(void)
 209{
 210        output_data = (char *)KERNEL_LOAD_ADR;
 211}
 212
 213static inline void
 214serial_setup(reg_scope_instances regi_ser)
 215{
 216        reg_ser_rw_xoff xoff;
 217        reg_ser_rw_tr_ctrl tr_ctrl;
 218        reg_ser_rw_rec_ctrl rec_ctrl;
 219        reg_ser_rw_tr_baud_div tr_baud;
 220        reg_ser_rw_rec_baud_div rec_baud;
 221
 222        /* Turn off XOFF. */
 223        xoff = REG_RD(ser, regi_ser, rw_xoff);
 224
 225        xoff.chr = 0;
 226        xoff.automatic = regk_ser_no;
 227
 228        REG_WR(ser, regi_ser, rw_xoff, xoff);
 229
 230        /* Set baudrate and stopbits. */
 231        tr_ctrl = REG_RD(ser, regi_ser, rw_tr_ctrl);
 232        rec_ctrl = REG_RD(ser, regi_ser, rw_rec_ctrl);
 233        tr_baud = REG_RD(ser, regi_ser, rw_tr_baud_div);
 234        rec_baud = REG_RD(ser, regi_ser, rw_rec_baud_div);
 235
 236        tr_ctrl.stop_bits = 1;  /* 2 stop bits. */
 237        tr_ctrl.en = 1; /* enable transmitter */
 238        rec_ctrl.en = 1; /* enabler receiver */
 239
 240        /*
 241         * The baudrate setup used to be a bit fishy, but now transmitter and
 242         * receiver are both set to the intended baud rate, 115200.
 243         * The magic value is 29.493 MHz.
 244         */
 245        tr_ctrl.base_freq = regk_ser_f29_493;
 246        rec_ctrl.base_freq = regk_ser_f29_493;
 247        tr_baud.div = (29493000 / 8) / 115200;
 248        rec_baud.div = (29493000 / 8) / 115200;
 249
 250        REG_WR(ser, regi_ser, rw_tr_ctrl, tr_ctrl);
 251        REG_WR(ser, regi_ser, rw_tr_baud_div, tr_baud);
 252        REG_WR(ser, regi_ser, rw_rec_ctrl, rec_ctrl);
 253        REG_WR(ser, regi_ser, rw_rec_baud_div, rec_baud);
 254}
 255
 256void
 257decompress_kernel(void)
 258{
 259        char revision;
 260
 261#if defined(CONFIG_ETRAX_DEBUG_PORT1) || \
 262    defined(CONFIG_ETRAX_DEBUG_PORT2) || \
 263    defined(CONFIG_ETRAX_DEBUG_PORT3)
 264        reg_pinmux_rw_hwprot hwprot;
 265
 266#ifdef CONFIG_CRIS_MACH_ARTPEC3
 267        reg_clkgen_rw_clk_ctrl clk_ctrl;
 268
 269        /* Enable corresponding clock region when serial 1..3 selected */
 270
 271        clk_ctrl = REG_RD(clkgen, regi_clkgen, rw_clk_ctrl);
 272        clk_ctrl.sser_ser_dma6_7 = regk_clkgen_yes;
 273        REG_WR(clkgen, regi_clkgen, rw_clk_ctrl, clk_ctrl);
 274#endif
 275
 276        /* pinmux setup for ports 1..3 */
 277        hwprot = REG_RD(pinmux, regi_pinmux, rw_hwprot);
 278#endif
 279
 280#ifdef CONFIG_ETRAX_DEBUG_PORT0
 281        serial_setup(regi_ser0);
 282#endif
 283#ifdef CONFIG_ETRAX_DEBUG_PORT1
 284        hwprot.ser1 = regk_pinmux_yes;
 285        serial_setup(regi_ser1);
 286#endif
 287#ifdef CONFIG_ETRAX_DEBUG_PORT2
 288        hwprot.ser2 = regk_pinmux_yes;
 289        serial_setup(regi_ser2);
 290#endif
 291#ifdef CONFIG_ETRAX_DEBUG_PORT3
 292        hwprot.ser3 = regk_pinmux_yes;
 293        serial_setup(regi_ser3);
 294#endif
 295#if defined(CONFIG_ETRAX_DEBUG_PORT1) || \
 296    defined(CONFIG_ETRAX_DEBUG_PORT2) || \
 297    defined(CONFIG_ETRAX_DEBUG_PORT3)
 298        REG_WR(pinmux, regi_pinmux, rw_hwprot, hwprot);
 299#endif
 300
 301        /* input_data is set in head.S */
 302        inbuf = input_data;
 303
 304        setup_normal_output_buffer();
 305
 306        makecrc();
 307
 308        __asm__ volatile ("move $vr,%0" : "=rm" (revision));
 309        if (revision < 32)
 310        {
 311                puts("You need an ETRAX FS to run Linux 2.6/crisv32.\r\n");
 312                while(1);
 313        }
 314
 315        puts("Uncompressing Linux...\r\n");
 316        gunzip();
 317        puts("Done. Now booting the kernel.\r\n");
 318}
 319