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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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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
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+ *
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+ */
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+
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+#include <linux/string.h>
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+
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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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+
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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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+
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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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+
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+static uch *inbuf; /* input buffer */
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+static uch window[WSIZE]; /* Sliding window buffer */
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+
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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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+
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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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+
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+#define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())
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+
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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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+
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+extern char input_data[];
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+extern int input_len;
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+
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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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+
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+#include "console.c"
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+
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+static void error(char *m);
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+
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+int puts(const char *);
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+
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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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+
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+#define HEAP_SIZE 0x10000
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+
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+#include "../../../../lib/inflate.c"
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+
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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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+
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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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+
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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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+
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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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+/*
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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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+
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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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+/*
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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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+
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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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+
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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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+
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+ while (1) /* Halt */
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+ ;
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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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+
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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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Ley Foon Tan