linux/arch/nios2/boot/compressed/misc.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Copyright (C) 2009 Thomas Chou <thomas@wytron.com.tw>
   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 * Adapted for SH by Stuart Menefy, Aug 1999
  11 *
  12 * Modified to use standard LinuxSH BIOS by Greg Banks 7Jul2000
  13 *
  14 * Based on arch/sh/boot/compressed/misc.c
  15 */
  16
  17#include <linux/string.h>
  18
  19/*
  20 * gzip declarations
  21 */
  22#define OF(args)  args
  23#define STATIC static
  24
  25#undef memset
  26#undef memcpy
  27#define memzero(s, n)           memset((s), 0, (n))
  28
  29typedef unsigned char  uch;
  30typedef unsigned short ush;
  31typedef unsigned long  ulg;
  32#define WSIZE 0x8000            /* Window size must be at least 32k, */
  33                                /* and a power of two */
  34
  35static uch *inbuf;              /* input buffer */
  36static uch window[WSIZE];       /* Sliding window buffer */
  37
  38static unsigned insize; /* valid bytes in inbuf */
  39static unsigned inptr;  /* index of next byte to be processed in inbuf */
  40static unsigned outcnt; /* bytes in output buffer */
  41
  42/* gzip flag byte */
  43#define ASCII_FLAG      0x01 /* bit 0 set: file probably ASCII text */
  44#define CONTINUATION    0x02 /* bit 1 set: continuation of multi-part gzip
  45                                file */
  46#define EXTRA_FIELD     0x04 /* bit 2 set: extra field present */
  47#define ORIG_NAME       0x08 /* bit 3 set: original file name present */
  48#define COMMENT         0x10 /* bit 4 set: file comment present */
  49#define ENCRYPTED       0x20 /* bit 5 set: file is encrypted */
  50#define RESERVED        0xC0 /* bit 6,7:   reserved */
  51
  52#define get_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf())
  53
  54#ifdef DEBUG
  55#  define Assert(cond, msg) {if (!(cond)) error(msg); }
  56#  define Trace(x) fprintf x
  57#  define Tracev(x) {if (verbose) fprintf x ; }
  58#  define Tracevv(x) {if (verbose > 1) fprintf x ; }
  59#  define Tracec(c, x) {if (verbose && (c)) fprintf x ; }
  60#  define Tracecv(c, x) {if (verbose > 1 && (c)) fprintf x ; }
  61#else
  62#  define Assert(cond, msg)
  63#  define Trace(x)
  64#  define Tracev(x)
  65#  define Tracevv(x)
  66#  define Tracec(c, x)
  67#  define Tracecv(c, x)
  68#endif
  69static int  fill_inbuf(void);
  70static void flush_window(void);
  71static void error(char *m);
  72
  73extern char input_data[];
  74extern int input_len;
  75
  76static long bytes_out;
  77static uch *output_data;
  78static unsigned long output_ptr;
  79
  80#include "console.c"
  81
  82static void error(char *m);
  83
  84int puts(const char *);
  85
  86extern int _end;
  87static unsigned long free_mem_ptr;
  88static unsigned long free_mem_end_ptr;
  89
  90#define HEAP_SIZE                       0x10000
  91
  92#include "../../../../lib/inflate.c"
  93
  94void *memset(void *s, int c, size_t n)
  95{
  96        int i;
  97        char *ss = (char *)s;
  98
  99        for (i = 0; i < n; i++)
 100                ss[i] = c;
 101        return s;
 102}
 103
 104void *memcpy(void *__dest, __const void *__src, size_t __n)
 105{
 106        int i;
 107        char *d = (char *)__dest, *s = (char *)__src;
 108
 109        for (i = 0; i < __n; i++)
 110                d[i] = s[i];
 111        return __dest;
 112}
 113
 114/*
 115 * Fill the input buffer. This is called only when the buffer is empty
 116 * and at least one byte is really needed.
 117 */
 118static int fill_inbuf(void)
 119{
 120        if (insize != 0)
 121                error("ran out of input data");
 122
 123        inbuf = input_data;
 124        insize = input_len;
 125        inptr = 1;
 126        return inbuf[0];
 127}
 128
 129/*
 130 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
 131 * (Used for the decompressed data only.)
 132 */
 133static void flush_window(void)
 134{
 135        ulg c = crc;    /* temporary variable */
 136        unsigned n;
 137        uch *in, *out, ch;
 138
 139        in = window;
 140        out = &output_data[output_ptr];
 141        for (n = 0; n < outcnt; n++) {
 142                ch = *out++ = *in++;
 143                c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
 144        }
 145        crc = c;
 146        bytes_out += (ulg)outcnt;
 147        output_ptr += (ulg)outcnt;
 148        outcnt = 0;
 149}
 150
 151static void error(char *x)
 152{
 153        puts("\nERROR\n");
 154        puts(x);
 155        puts("\n\n -- System halted");
 156
 157        while (1)       /* Halt */
 158                ;
 159}
 160
 161void decompress_kernel(void)
 162{
 163        output_data = (void *) (CONFIG_NIOS2_MEM_BASE |
 164                                CONFIG_NIOS2_KERNEL_REGION_BASE);
 165        output_ptr = 0;
 166        free_mem_ptr = (unsigned long)&_end;
 167        free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
 168
 169        console_init();
 170        makecrc();
 171        puts("Uncompressing Linux... ");
 172        gunzip();
 173        puts("Ok, booting the kernel.\n");
 174}
 175
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