diff options
Diffstat (limited to 'arch/nios2/boot/compressed/misc.c')
| -rw-r--r-- | arch/nios2/boot/compressed/misc.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/arch/nios2/boot/compressed/misc.c b/arch/nios2/boot/compressed/misc.c new file mode 100644 index 000000000000..84377825ef1a --- /dev/null +++ b/arch/nios2/boot/compressed/misc.c @@ -0,0 +1,187 @@ +/* + * 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 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + */ + +#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"); +} |