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/* read_memory.c
*
* This file is subject to the terms and conditions of the GNU
* General Public License. See the file "COPYING" in the main
* directory of this archive for more details.
*
* Copyright (C) 2000, Jay Carlson
*/
/* read_memory is the memory-based back end for the image-reading
* functions.
*
* Support for non-compressed kernels has probably rotted.
*/
#include <linux/types.h>
#include "hfload.h"
#ifndef EMBEDDED
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#endif
char *source_memory;
#ifdef EMBEDDED
#ifndef COMPRESSED_KERNEL
extern char source_memory_start;
#endif
#endif
// david -----------------------
//#include <linux/config.h>
#include <linux/autoconf.h>
//#ifdef BZ2_COMPRESS //sc_yang
void * memcpy(void * dest,const void *src,size_t count)
{
char *tmp = (char *) dest, *s = (char *) src;
while (count--)
*tmp++ = *s++;
return dest;
}
#if 0
void * memset(void * s, int c, size_t count)
{
char *xs = (char *) s;
while (count--)
*xs++ = (char) c;
return s;
}
#endif // CONFIG_NINO_8MB
//------------------------------
void
read_struct(void *s, ssize_t size)
{
memcpy(s, source_memory+file_offset, size);
file_offset += size;
}
void
seek_forward(int offset) {
if (offset % 4 != 0) {
#ifndef __DO_QUIET__
printf("Can't seek by a non-word aligned amount\n");
#endif
exit(1);
}
if (offset < file_offset) {
#ifndef __DO_QUIET__
printf("can't seek backwards\n");
#endif
exit(1);
}
file_offset = offset;
}
void
copy_to_region(int *addr, ssize_t size) {
int i, dummy;
int *source, *dest;
#ifndef __DO_QUIET__
printf("copying 0x%x bytes from file offset 0x%x to address 0x%08x\n",
size, file_offset, addr);
#endif
#ifndef FAKE_COPYING
memcpy(addr, source_memory+file_offset, size);
#endif
file_offset += size;
}
void
init_read() {
#ifndef EMBEDDED
struct stat buf;
if (fstat(0, &buf)) {
perror("stat");
exit(1);
}
source_memory = mmap(0, buf.st_size & ~(4095), PROT_READ, MAP_PRIVATE, 0, 0);
if (!source_memory) {
perror("mmap");
exit(1);
}
#else
#ifdef COMPRESSED_KERNEL
source_memory = (char *)UNCOMPRESS_OUT;
#else
source_memory = &source_memory_start;
#endif
#endif
}
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