am 6fa54fa2: Merge "Accept address ranges in r" into honeycomb

int r_main(int argc, char *argv[])

{

    int width = 4, set = 0, fd;

    unsigned addr, value;

    unsigned addr, value, endaddr = 0;

    unsigned long mmap_start, mmap_size;

    void *page;

    char *end;

    if(argc < 2) return usage();

    if(argc < 2) return usage();

    addr = strtoul(argv[1], 0, 16);

    end = strchr(argv[1], '-');

    if (end)

        endaddr = strtoul(end + 1, 0, 16);

    if (!endaddr)

        endaddr = addr + width - 1;

    if (endaddr <= addr) {

        fprintf(stderr, "invalid end address\n");

        return -1;

    }

    if(argc > 2) {

        set = 1;

        value = strtoul(argv[2], 0, 16);

        return -1;

    }

    page = mmap(0, 8192, PROT_READ | PROT_WRITE,

                MAP_SHARED, fd, addr & (~4095));

    mmap_start = addr & ~(PAGE_SIZE - 1);

    mmap_size = endaddr - mmap_start + 1;

    mmap_size = (mmap_size + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1);

    page = mmap(0, mmap_size, PROT_READ | PROT_WRITE,

                MAP_SHARED, fd, mmap_start);

    if(page == MAP_FAILED){

        fprintf(stderr,"cannot mmap region\n");

        return -1;

    }

    while (addr <= endaddr) {

        switch(width){

        case 4: {

            unsigned *x = (unsigned*) (((unsigned) page) + (addr & 4095));

            break;

        }

        }

        addr += width;

    }

    return 0;

}