Return to callfunc.c CVS log

Up to [MW Coherent from dump] / coherent / b / kernel / tools

coherent

/*
 * Call a kernel function with the NLCALL ioctl on /dev/kmem.
 */
#include <stdio.h>
#include <fcntl.h>
#include <sys/null.h>

/*
 * Set FUNC to the address of the routine you want called.
 */
#define FUNC   0xFFC02610	/* vptop()	*/
/* #define FUNC   0xFFC02590	/* vtop()	*/
/* #define FUNC   0xFFC0267C	/* vtovp()	*/

main()
{
	int fd;
	unsigned vec[7];

	if ((fd = open("/dev/kmem", O_RDONLY)) == -1) {
		printf("Can't open /dev/kmem.\n");
	}
	
	/*
	 * The first element of this vector gives the length for the
	 * whole vector.  The kernel will copy in this many unsigneds.
	 * Because extra arguments are ignored by any function, I
	 * usually just leave this at the maximum value of 7.
	 * Setting this element to something larger than 7 results in
	 * a return value of -1 with errno set to EINVAL.
	 *
	 * The ioctl() will put the return value of the function in element
	 * 0.
	 *
	 * The second element is the address of the function to be
	 * called.
	 *
	 * Successive elements are arguments to be passed to the
	 * function.  Only the first 5 will be passed.
	 */
	vec[0] = 7;
	vec[1] = FUNC;
 	vec[2] = 0xF3B0E8;	/* virtual-physical */
	vec[3] = 0;
	vec[4] = 0;
	vec[5] = 0;
	vec[6] = 0;

	ioctl(fd, NLCALL, vec);

	printf("retval: 0x%x\n", vec[0]);

	close(fd);
} /* main() */

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.