LXR linux/arch/cris/arch-v10/boot/compressed/misc.c

   1/*
   2 * misc.c
   3 *
   4 * $Id: misc.c,v 1.6 2003/10/27 08:04:31 starvik Exp $
   5 * 
   6 * This is a collection of several routines from gzip-1.0.3 
   7 * adapted for Linux.
   8 *
   9 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
  10 * puts by Nick Holloway 1993, better puts by Martin Mares 1995
  11 * adoptation for Linux/CRIS Axis Communications AB, 1999
  12 * 
  13 */
  14
  15/* where the piggybacked kernel image expects itself to live.
  16 * it is the same address we use when we network load an uncompressed
  17 * image into DRAM, and it is the address the kernel is linked to live
  18 * at by vmlinux.lds.S
  19 */
  20
  21#define KERNEL_LOAD_ADR 0x40004000
  22
  23#include <linux/config.h>
  24
  25#include <linux/types.h>
  26#include <asm/arch/svinto.h>
  27
  28/*
  29 * gzip declarations
  30 */
  31
  32#define OF(args)  args
  33#define STATIC static
  34
  35void* memset(void* s, int c, size_t n);
  36void* memcpy(void* __dest, __const void* __src,
  37             size_t __n);
  38
  39#define memzero(s, n)     memset ((s), 0, (n))
  40
  41
  42typedef unsigned char  uch;
  43typedef unsigned short ush;
  44typedef unsigned long  ulg;
  45
  46#define WSIZE 0x8000            /* Window size must be at least 32k, */
  47                                /* and a power of two */
  48
  49static uch *inbuf;           /* input buffer */
  50static uch window[WSIZE];    /* Sliding window buffer */
  51
  52unsigned inptr = 0;     /* index of next byte to be processed in inbuf
  53                         * After decompression it will contain the
  54                         * compressed size, and head.S will read it.
  55                         */
  56
  57static unsigned outcnt = 0;  /* bytes in output buffer */
  58
  59/* gzip flag byte */
  60#define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
  61#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
  62#define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
  63#define ORIG_NAME    0x08 /* bit 3 set: original file name present */
  64#define COMMENT      0x10 /* bit 4 set: file comment present */
  65#define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
  66#define RESERVED     0xC0 /* bit 6,7:   reserved */
  67
  68#define get_byte() inbuf[inptr++]       
  69        
  70/* Diagnostic functions */
  71#ifdef DEBUG
  72#  define Assert(cond,msg) {if(!(cond)) error(msg);}
  73#  define Trace(x) fprintf x
  74#  define Tracev(x) {if (verbose) fprintf x ;}
  75#  define Tracevv(x) {if (verbose>1) fprintf x ;}
  76#  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
  77#  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
  78#else
  79#  define Assert(cond,msg)
  80#  define Trace(x)
  81#  define Tracev(x)
  82#  define Tracevv(x)
  83#  define Tracec(c,x)
  84#  define Tracecv(c,x)
  85#endif
  86
  87static int  fill_inbuf(void);
  88static void flush_window(void);
  89static void error(char *m);
  90static void gzip_mark(void **);
  91static void gzip_release(void **);
  92
  93extern char *input_data;  /* lives in head.S */
  94
  95static long bytes_out = 0;
  96static uch *output_data;
  97static unsigned long output_ptr = 0;
  98 
  99static void *malloc(int size);
 100static void free(void *where);
 101static void error(char *m);
 102static void gzip_mark(void **);
 103static void gzip_release(void **);
 104 
 105static void puts(const char *);
 106
 107/* the "heap" is put directly after the BSS ends, at end */
 108  
 109extern int end;
 110static long free_mem_ptr = (long)&end;
 111 
 112#include "../../../../../lib/inflate.c"
 113
 114static void *malloc(int size)
 115{
 116        void *p;
 117
 118        if (size <0) error("Malloc error");
 119
 120        free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
 121
 122        p = (void *)free_mem_ptr;
 123        free_mem_ptr += size;
 124
 125        return p;
 126}
 127
 128static void free(void *where)
 129{       /* Don't care */
 130}
 131
 132static void gzip_mark(void **ptr)
 133{
 134        *ptr = (void *) free_mem_ptr;
 135}
 136
 137static void gzip_release(void **ptr)
 138{
 139        free_mem_ptr = (long) *ptr;
 140}
 141
 142/* decompressor info and error messages to serial console */
 143
 144static void
 145puts(const char *s)
 146{
 147#ifndef CONFIG_ETRAX_DEBUG_PORT_NULL
 148        while(*s) {
 149#ifdef CONFIG_ETRAX_DEBUG_PORT0
 150                while(!(*R_SERIAL0_STATUS & (1 << 5))) ;
 151                *R_SERIAL0_TR_DATA = *s++;
 152#endif
 153#ifdef CONFIG_ETRAX_DEBUG_PORT1
 154                while(!(*R_SERIAL1_STATUS & (1 << 5))) ;
 155                *R_SERIAL1_TR_DATA = *s++;
 156#endif
 157#ifdef CONFIG_ETRAX_DEBUG_PORT2
 158                while(!(*R_SERIAL2_STATUS & (1 << 5))) ;
 159                *R_SERIAL2_TR_DATA = *s++;
 160#endif
 161#ifdef CONFIG_ETRAX_DEBUG_PORT3
 162                while(!(*R_SERIAL3_STATUS & (1 << 5))) ;
 163                *R_SERIAL3_TR_DATA = *s++;
 164#endif
 165        }
 166#endif
 167}
 168
 169void*
 170memset(void* s, int c, size_t n)
 171{
 172        int i;
 173        char *ss = (char*)s;
 174
 175        for (i=0;i<n;i++) ss[i] = c;
 176}
 177
 178void*
 179memcpy(void* __dest, __const void* __src,
 180                            size_t __n)
 181{
 182        int i;
 183        char *d = (char *)__dest, *s = (char *)__src;
 184
 185        for (i=0;i<__n;i++) d[i] = s[i];
 186}
 187
 188/* ===========================================================================
 189 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
 190 * (Used for the decompressed data only.)
 191 */
 192
 193static void
 194flush_window()
 195{
 196    ulg c = crc;         /* temporary variable */
 197    unsigned n;
 198    uch *in, *out, ch;
 199    
 200    in = window;
 201    out = &output_data[output_ptr]; 
 202    for (n = 0; n < outcnt; n++) {
 203            ch = *out++ = *in++;
 204            c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
 205    }
 206    crc = c;
 207    bytes_out += (ulg)outcnt;
 208    output_ptr += (ulg)outcnt;
 209    outcnt = 0;
 210}
 211
 212static void
 213error(char *x)
 214{
 215        puts("\n\n");
 216        puts(x);
 217        puts("\n\n -- System halted\n");
 218
 219        while(1);       /* Halt */
 220}
 221
 222void
 223setup_normal_output_buffer()
 224{
 225        output_data = (char *)KERNEL_LOAD_ADR;
 226}
 227
 228void
 229decompress_kernel()
 230{
 231        char revision;
 232        
 233        /* input_data is set in head.S */
 234        inbuf = input_data;
 235
 236#ifdef CONFIG_ETRAX_DEBUG_PORT0
 237        *R_SERIAL0_XOFF = 0;
 238        *R_SERIAL0_BAUD = 0x99;
 239        *R_SERIAL0_TR_CTRL = 0x40;
 240#endif
 241#ifdef CONFIG_ETRAX_DEBUG_PORT1
 242        *R_SERIAL1_XOFF = 0;
 243        *R_SERIAL1_BAUD = 0x99;
 244        *R_SERIAL1_TR_CTRL = 0x40;
 245#endif
 246#ifdef CONFIG_ETRAX_DEBUG_PORT2
 247        *R_GEN_CONFIG = 0x08;
 248        *R_SERIAL2_XOFF = 0;
 249        *R_SERIAL2_BAUD = 0x99;
 250        *R_SERIAL2_TR_CTRL = 0x40;
 251#endif
 252#ifdef CONFIG_ETRAX_DEBUG_PORT3
 253        *R_GEN_CONFIG = 0x100;
 254        *R_SERIAL3_XOFF = 0;
 255        *R_SERIAL3_BAUD = 0x99;
 256        *R_SERIAL3_TR_CTRL = 0x40;
 257#endif
 258
 259        setup_normal_output_buffer();
 260
 261        makecrc();
 262
 263        __asm__ volatile ("move vr,%0" : "=rm" (revision));
 264        if (revision < 10)
 265        {
 266                puts("You need an ETRAX 100LX to run linux 2.6\n");
 267                while(1);
 268        }
 269
 270        puts("Uncompressing Linux...\n");
 271        gunzip();
 272        puts("Done. Now booting the kernel.\n");
 273}
 274