mirror of
https://github.com/xcat2/xNBA.git
synced 2024-11-26 19:29:04 +00:00
116 lines
2.9 KiB
C
116 lines
2.9 KiB
C
#include <fcntl.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
#ifndef __TURBOC__
|
|
#include <sys/mman.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
#endif
|
|
|
|
#ifdef __TURBOC__
|
|
#define HUGE huge
|
|
#else
|
|
#define HUGE
|
|
#endif
|
|
|
|
#define ROMSTART 0xC8000
|
|
#define ROMEND 0xE8000
|
|
#define ROMINCREMENT 0x00800
|
|
#define ROMMASK 0x03FFF
|
|
|
|
#ifndef MAP_FAILED
|
|
#define MAP_FAILED ((void *)(long long)-1)
|
|
#endif
|
|
|
|
typedef struct Images {
|
|
struct Images *next;
|
|
long start;
|
|
long size;
|
|
} Images;
|
|
|
|
static void rom_scan(const unsigned char HUGE *rom,long offset,long len)
|
|
{
|
|
static Images *images = NULL;
|
|
Images *ptr;
|
|
/* The assignments to dummy are to overcome a bug in TurboC */
|
|
long dummy, size;
|
|
int chksum;
|
|
long i;
|
|
|
|
if (rom[offset] != 0x55 || rom[dummy = offset+1] != 0xAA)
|
|
return;
|
|
size = (long)rom[dummy = offset+2]*512L;
|
|
printf("Found ROM header at %04lX:0000; "
|
|
"announces %ldk image (27C%02d EPROM)\n",
|
|
offset/16,(size+512)/1024,
|
|
size <= 1024 ? 8 :
|
|
size <= 2048 ? 16 :
|
|
size <= 4096 ? 32 :
|
|
size <= 8192 ? 64 :
|
|
size <= 16384 ? 128 :
|
|
size <= 32768 ? 256 :
|
|
size <= 65536 ? 512 : 11);
|
|
if (offset & ROMMASK)
|
|
printf(" This is a unusual position; not all BIOSs might find it.\n"
|
|
" Try to move to a 16kB boundary.\n");
|
|
if (size > len) {
|
|
printf(" This image extends beyond %04X:0000. "
|
|
"It clashes with the system BIOS\n",
|
|
ROMEND/16);
|
|
size = len; }
|
|
for (chksum=0, i = size; i--; chksum += rom[dummy = offset+i]);
|
|
if (chksum % 256)
|
|
printf(" Checksum does not match. This image is not active\n");
|
|
ptr = malloc(sizeof(Images));
|
|
ptr->next = images;
|
|
ptr->start = offset;
|
|
ptr->size = size;
|
|
images = ptr;
|
|
for (ptr = ptr->next; ptr != NULL; ptr = ptr->next) {
|
|
for (i = 0; i < size && i < ptr->size; i++)
|
|
if (rom[dummy = ptr->start+i] != rom[dummy = offset+i])
|
|
break;
|
|
if (i > 32) {
|
|
printf(" Image is identical with image at %04lX:0000 "
|
|
"for the first %ld bytes\n",
|
|
ptr->start/16,i);
|
|
if (i >= 1024)
|
|
if (i == size)
|
|
printf(" this means that you misconfigured the EPROM size!\n");
|
|
else
|
|
printf(" this could suggest that you misconfigured the "
|
|
"EPROM size\n");
|
|
else
|
|
printf(" this is probably harmless. Just ignore it...\n"); } }
|
|
return;
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
long i;
|
|
unsigned char HUGE *rom;
|
|
|
|
#ifndef __TURBOC__
|
|
int fh;
|
|
if ((fh = open("/dev/kmem",O_RDONLY|O_SYNC)) < 0) {
|
|
fprintf(stderr,"Could not open \"/dev/kmem\": %s\n",0 );//strerror(errno));
|
|
return(1); }
|
|
if ((rom = mmap(NULL,ROMEND-ROMSTART,PROT_READ,MAP_SHARED,fh,
|
|
ROMSTART)) == MAP_FAILED) {
|
|
fprintf(stderr,"Could not mmap \"/dev/kmem\": %s\n",0); //strerror(errno));
|
|
close(fh);
|
|
return(1); }
|
|
close(fh);
|
|
#endif
|
|
for (i = ROMEND; (i -= ROMINCREMENT) >= ROMSTART; )
|
|
#ifdef __TURBOC__
|
|
rom_scan(0,i,ROMEND-i);
|
|
#else
|
|
rom_scan(rom-ROMSTART,i,ROMEND-i);
|
|
munmap(rom,ROMEND-ROMSTART);
|
|
#endif
|
|
return(0);
|
|
}
|