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#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <unistd.h>
#include <fcntl.h>
static void *map_memory(const char *fn, unsigned base, unsigned size)
{
int fd;
void *ptr;
fd = open(fn, O_RDWR | O_SYNC);
if(fd < 0) {
perror("cannot open %s for mapping");
return MAP_FAILED;
}
ptr = mmap(0, size, PROT_READ | PROT_WRITE,
MAP_SHARED, fd, base);
close(fd);
if(ptr == MAP_FAILED) {
fprintf(stderr,"cannot map %s (@%08x,%08x)\n", fn, base, size);
}
return ptr;
}
int main(int argc, char** argv)
{
void *grp_regs = map_memory("/dev/hw3d", 0, 1024 * 1024);
printf("GPU base mapped at %p\n", grp_regs);
int state_offset = 0x10140;
printf("GPU state = %08lx\n",
*((long*)((char*)grp_regs + state_offset)) );
return 0;
}
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