coreboot-kgpe-d16/util/inteltool/memory.c

/*
 * inteltool - dump all registers on an Intel CPU + chipset based system.
 *
 * Copyright (C) 2008 by coresystems GmbH 
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */


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

#include "inteltool.h"

/*
 * (G)MCH MMIO Config Space
 */
int print_mchbar(struct pci_dev *nb)
{
	int i, size = (16 * 1024);
	volatile uint8_t *mchbar;
	uint32_t mchbar_phys;

	printf("\n============= MCHBAR ============\n\n");

	switch (nb->device_id) {
	case PCI_DEVICE_ID_INTEL_82945GM:
	case PCI_DEVICE_ID_INTEL_82945P:
		mchbar_phys = pci_read_long(nb, 0x44) & 0xfffffffe;
		break;
	case 0x1234: // Dummy for non-existent functionality
		printf("This northbrigde does not have MCHBAR.\n");
		return 1;
	default:
		printf("Error: Dumping MCHBAR on this northbridge is not (yet) supported.\n");
		return 1;
	}

	mchbar = mmap(0, size, PROT_WRITE | PROT_READ, MAP_SHARED,
		      fd_mem, (off_t) mchbar_phys);
	
	if (mchbar == MAP_FAILED) {
		perror("Error mapping MCHBAR");
		exit(1);
	}

	printf("MCHBAR = 0x%08x (MEM)\n\n", mchbar_phys);

	for (i = 0; i < size; i += 4) {
		if (*(uint32_t *)(mchbar + i))
			printf("0x%04x: 0x%08x\n", i, *(uint32_t *)(mchbar+i));
	}

	munmap((void *)mchbar, size);
	return 0;
}