linux/arch/alpha/boot/misc.c
<<
>>
Prefs
   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * misc.c
   4 * 
   5 * This is a collection of several routines from gzip-1.0.3 
   6 * adapted for Linux.
   7 *
   8 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
   9 *
  10 * Modified for ARM Linux by Russell King
  11 *
  12 * Nicolas Pitre <nico@visuaide.com>  1999/04/14 :
  13 *  For this code to run directly from Flash, all constant variables must
  14 *  be marked with 'const' and all other variables initialized at run-time 
  15 *  only.  This way all non constant variables will end up in the bss segment,
  16 *  which should point to addresses in RAM and cleared to 0 on start.
  17 *  This allows for a much quicker boot time.
  18 *
  19 * Modified for Alpha, from the ARM version, by Jay Estabrook 2003.
  20 */
  21
  22#include <linux/kernel.h>
  23#include <linux/slab.h>
  24
  25#include <linux/uaccess.h>
  26
  27#define memzero(s,n)    memset ((s),0,(n))
  28#define puts            srm_printk
  29extern long srm_printk(const char *, ...)
  30     __attribute__ ((format (printf, 1, 2)));
  31
  32/*
  33 * gzip declarations
  34 */
  35#define OF(args)  args
  36#define STATIC static
  37
  38typedef unsigned char  uch;
  39typedef unsigned short ush;
  40typedef unsigned long  ulg;
  41
  42#define WSIZE 0x8000            /* Window size must be at least 32k, */
  43                                /* and a power of two */
  44
  45static uch *inbuf;              /* input buffer */
  46static uch *window;             /* Sliding window buffer */
  47
  48static unsigned insize;         /* valid bytes in inbuf */
  49static unsigned inptr;          /* index of next byte to be processed in inbuf */
  50static unsigned outcnt;         /* bytes in output buffer */
  51
  52/* gzip flag byte */
  53#define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
  54#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
  55#define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
  56#define ORIG_NAME    0x08 /* bit 3 set: original file name present */
  57#define COMMENT      0x10 /* bit 4 set: file comment present */
  58#define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
  59#define RESERVED     0xC0 /* bit 6,7:   reserved */
  60
  61#define get_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf())
  62
  63/* Diagnostic functions */
  64#ifdef DEBUG
  65#  define Assert(cond,msg) {if(!(cond)) error(msg);}
  66#  define Trace(x) fprintf x
  67#  define Tracev(x) {if (verbose) fprintf x ;}
  68#  define Tracevv(x) {if (verbose>1) fprintf x ;}
  69#  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
  70#  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
  71#else
  72#  define Assert(cond,msg)
  73#  define Trace(x)
  74#  define Tracev(x)
  75#  define Tracevv(x)
  76#  define Tracec(c,x)
  77#  define Tracecv(c,x)
  78#endif
  79
  80static int  fill_inbuf(void);
  81static void flush_window(void);
  82static void error(char *m);
  83
  84static char *input_data;
  85static int  input_data_size;
  86
  87static uch *output_data;
  88static ulg output_ptr;
  89static ulg bytes_out;
  90
  91static void error(char *m);
  92static void gzip_mark(void **);
  93static void gzip_release(void **);
  94
  95extern int end;
  96static ulg free_mem_ptr;
  97static ulg free_mem_end_ptr;
  98
  99#define HEAP_SIZE 0x3000
 100
 101#include "../../../lib/inflate.c"
 102
 103/* ===========================================================================
 104 * Fill the input buffer. This is called only when the buffer is empty
 105 * and at least one byte is really needed.
 106 */
 107int fill_inbuf(void)
 108{
 109        if (insize != 0)
 110                error("ran out of input data");
 111
 112        inbuf = input_data;
 113        insize = input_data_size;
 114
 115        inptr = 1;
 116        return inbuf[0];
 117}
 118
 119/* ===========================================================================
 120 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
 121 * (Used for the decompressed data only.)
 122 */
 123void flush_window(void)
 124{
 125        ulg c = crc;
 126        unsigned n;
 127        uch *in, *out, ch;
 128
 129        in = window;
 130        out = &output_data[output_ptr];
 131        for (n = 0; n < outcnt; n++) {
 132                ch = *out++ = *in++;
 133                c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
 134        }
 135        crc = c;
 136        bytes_out += (ulg)outcnt;
 137        output_ptr += (ulg)outcnt;
 138        outcnt = 0;
 139/*      puts("."); */
 140}
 141
 142static void error(char *x)
 143{
 144        puts("\n\n");
 145        puts(x);
 146        puts("\n\n -- System halted");
 147
 148        while(1);       /* Halt */
 149}
 150
 151unsigned int
 152decompress_kernel(void *output_start,
 153                  void *input_start,
 154                  size_t ksize,
 155                  size_t kzsize)
 156{
 157        output_data             = (uch *)output_start;
 158        input_data              = (uch *)input_start;
 159        input_data_size         = kzsize; /* use compressed size */
 160
 161        /* FIXME FIXME FIXME */
 162        free_mem_ptr            = (ulg)output_start + ksize;
 163        free_mem_end_ptr        = (ulg)output_start + ksize + 0x200000;
 164        /* FIXME FIXME FIXME */
 165
 166        /* put in temp area to reduce initial footprint */
 167        window = malloc(WSIZE);
 168
 169        makecrc();
 170/*      puts("Uncompressing Linux..."); */
 171        gunzip();
 172/*      puts(" done, booting the kernel.\n"); */
 173        return output_ptr;
 174}
 175
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.