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