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