util/getpir/getpir.c

/* getpir.c : This software is released under GPL
 * For LinuxBIOS use only
 * Aug 26 2001 , Nikolai Vladychevski, <niko@isl.net.mx>
 * 2007.04.09 Jeremy Jackson <jerj@coplanar.net>
 *     updated for amd64 and general 64 bit portability
 */

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

#include "pirq_routing.h"
#include "checksum.h"
#include "code_gen.h"

#if defined (__sun) && (defined(__i386) || defined(__amd64))
#  define MEM_DEV "/dev/xsvc"
#else
#  define MEM_DEV "/dev/mem"
#endif

static struct irq_routing_table *probe_table(int fd_mem)
{
	char *ptr, signature[] = "$PIR";
	struct irq_routing_table *rt;

	ptr =  mmap(0, 0x10000, PROT_READ, MAP_SHARED,
		    fd_mem, (off_t) 0xf0000);

	if (ptr == MAP_FAILED) {
		perror("Mapping system memory failed: ");
		exit(1);
	}

	rt = (struct irq_routing_table *) memmem(ptr, 0xFFFF, signature, 4);

	if (rt != NULL) {
		printf("Found PCI IRQ routing table signature at %p.\n",
		       (void *)((char *)rt - ptr + 0xf0000));
	} else {
		printf("No PCI IRQ routing table signature found.\n");
		exit(1);
	}
	return rt;
}

int main(void)
{
	int fd_mem;
 	struct irq_routing_table *rt;

	if (getuid()) {
		fprintf(stderr, "Run me as root, I need access to " MEM_DEV ".\n");
	}

	fd_mem = open(MEM_DEV, O_RDONLY);
	if (fd_mem < 0) {
		perror("Could not open " MEM_DEV ":");
		exit(1);
	}

	printf("Probing PIRQ table in memory.\n");
	rt = probe_table(fd_mem);

	printf("Validating... ");
	if (!calc_checksum(rt))
		printf("checksum is ok.\n");
	else
		printf("checksum is wrong.\n");

	printf("Creating irq_tables.c ...\n");
	code_gen("irq_tables.c", rt);

	close(fd_mem);

	printf("Done, you can move the file to the LinuxBIOS tree now.\n");

	return 0;
}