175 lines
3.9 KiB
C
175 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2009 Thomas Chou <thomas@wytron.com.tw>
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*
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* This is a collection of several routines from gzip-1.0.3
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* adapted for Linux.
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*
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* malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
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*
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* Adapted for SH by Stuart Menefy, Aug 1999
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*
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* Modified to use standard LinuxSH BIOS by Greg Banks 7Jul2000
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*
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* Based on arch/sh/boot/compressed/misc.c
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*/
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#include <linux/string.h>
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/*
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* gzip declarations
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*/
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#define OF(args) args
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#define STATIC static
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#undef memset
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#undef memcpy
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#define memzero(s, n) memset((s), 0, (n))
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typedef unsigned char uch;
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typedef unsigned short ush;
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typedef unsigned long ulg;
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#define WSIZE 0x8000 /* Window size must be at least 32k, */
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/* and a power of two */
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static uch *inbuf; /* input buffer */
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static uch window[WSIZE]; /* Sliding window buffer */
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static unsigned insize; /* valid bytes in inbuf */
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static unsigned inptr; /* index of next byte to be processed in inbuf */
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static unsigned outcnt; /* bytes in output buffer */
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/* gzip flag byte */
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#define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
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#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip
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file */
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#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
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#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
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#define COMMENT 0x10 /* bit 4 set: file comment present */
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#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
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#define RESERVED 0xC0 /* bit 6,7: reserved */
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#define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())
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#ifdef DEBUG
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# define Assert(cond, msg) {if (!(cond)) error(msg); }
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# define Trace(x) fprintf x
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# define Tracev(x) {if (verbose) fprintf x ; }
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# define Tracevv(x) {if (verbose > 1) fprintf x ; }
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# define Tracec(c, x) {if (verbose && (c)) fprintf x ; }
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# define Tracecv(c, x) {if (verbose > 1 && (c)) fprintf x ; }
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#else
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# define Assert(cond, msg)
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# define Trace(x)
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# define Tracev(x)
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# define Tracevv(x)
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# define Tracec(c, x)
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# define Tracecv(c, x)
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#endif
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static int fill_inbuf(void);
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static void flush_window(void);
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static void error(char *m);
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extern char input_data[];
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extern int input_len;
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static long bytes_out;
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static uch *output_data;
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static unsigned long output_ptr;
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#include "console.c"
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static void error(char *m);
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int puts(const char *);
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extern int _end;
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static unsigned long free_mem_ptr;
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static unsigned long free_mem_end_ptr;
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#define HEAP_SIZE 0x10000
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#include "../../../../lib/inflate.c"
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void *memset(void *s, int c, size_t n)
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{
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int i;
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char *ss = (char *)s;
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for (i = 0; i < n; i++)
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ss[i] = c;
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return s;
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}
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void *memcpy(void *__dest, __const void *__src, size_t __n)
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{
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int i;
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char *d = (char *)__dest, *s = (char *)__src;
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for (i = 0; i < __n; i++)
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d[i] = s[i];
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return __dest;
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}
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/*
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* Fill the input buffer. This is called only when the buffer is empty
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* and at least one byte is really needed.
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*/
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static int fill_inbuf(void)
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{
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if (insize != 0)
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error("ran out of input data");
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inbuf = input_data;
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insize = input_len;
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inptr = 1;
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return inbuf[0];
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}
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/*
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* Write the output window window[0..outcnt-1] and update crc and bytes_out.
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* (Used for the decompressed data only.)
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*/
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static void flush_window(void)
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{
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ulg c = crc; /* temporary variable */
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unsigned n;
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uch *in, *out, ch;
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in = window;
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out = &output_data[output_ptr];
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for (n = 0; n < outcnt; n++) {
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ch = *out++ = *in++;
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c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
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}
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crc = c;
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bytes_out += (ulg)outcnt;
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output_ptr += (ulg)outcnt;
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outcnt = 0;
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}
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static void error(char *x)
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{
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puts("\nERROR\n");
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puts(x);
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puts("\n\n -- System halted");
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while (1) /* Halt */
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;
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}
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void decompress_kernel(void)
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{
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output_data = (void *) (CONFIG_NIOS2_MEM_BASE |
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CONFIG_NIOS2_KERNEL_REGION_BASE);
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output_ptr = 0;
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free_mem_ptr = (unsigned long)&_end;
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free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
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console_init();
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makecrc();
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puts("Uncompressing Linux... ");
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gunzip();
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puts("Ok, booting the kernel.\n");
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}
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