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Dump memory so we can figure out where the bios is.

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This commit is contained in:
Ronald G. Minnich 2002-09-05 20:44:24 +00:00
parent c614ed4cfd
commit ed9a782a42
2 changed files with 48 additions and 0 deletions
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2
util/dumpdevmem/Makefile Normal file
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dumpdevmem: dumpdevmem.o
cc -o dumpdevmem dumpdevmem.o

46
util/dumpdevmem/dumpdevmem.c Normal file
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#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
main(int argc, char *argv[])
{
int i;
volatile unsigned char *cp;
int fd;
void *v;
off_t nvram = 0xffe00000;
size_t length = 0x200000;
if ((argc > 1) && (! strncmp(argv[1], "--help", 6))) {
fprintf(stderr,
"Usage: %s [high 16 bits of base address [size]]\n", argv[0]);
fprintf(stderr,
"Dumps dev mem, starting at either argv[1]<<16 or (default) ");
fprintf(stderr,
"0xffe00000 for 0x200000 bytes (i.e. last 2MB of memory\n");
fprintf(stderr, "Example: %s 0xfff00000 0x100000\n");
fprintf(stderr, "Dumps last 1M of memory to stdout\n");
exit(0);
}
if (argc > 1)
nvram = (strtol(argv[1], 0, 0)) << 16;
if (argc > 2)
length = (strtol(argv[2], 0, 0)) ;
if((fd = open("/dev/mem",O_RDWR)) != -1)
{
v = mmap(0, length, PROT_READ | PROT_WRITE, MAP_SHARED,fd,nvram);
fprintf(stderr, "mmap returns %p\n", v);
if ( (int)v == -1)
{
perror("mmap");
exit(1);
}
} else {
perror("open /dev/mem");
exit(1);
}
write(fileno(stdout), v, length);
}