#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>

int main(int argc, char *argv[])
{
    void *mapped_base;
    int i, memfd, offset = 0, size = 1;

    memfd = open("/dev/mem", O_RDWR | O_SYNC);
    mapped_base = mmap(0, 0x08000000, PROT_READ, MAP_SHARED, memfd, 0x00800000);
    if (mapped_base == MAP_FAILED) {
        perror("mmap failure");
        return 1;
    }

    if (argc > 1)
        offset = strtol(argv[1], NULL, 0) - 0x00800000;

    if (argc > 2)
        size = strtol(argv[2], NULL, 0);

#if 0
    /* hack unlock ahci regs */
    *((int *)(mapped_base + 0x180fc)) = 0;
#endif

    for (i = 0; i < size; i++)
        printf("%08x: %08x\n", 0x00800000 + offset + i * 4,
               *((int *)(mapped_base + offset + i * 4)));

#if 0
    /* hack re-lock ahci regs */
    *((int *)(mapped_base + 0x180fc)) = 7;
#endif

    munmap(mapped_base, 0x08000000);
    close(memfd);

    return 0;
}