91 lines
2.3 KiB
C
91 lines
2.3 KiB
C
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/*
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* inteltool - dump all registers on an Intel CPU + chipset based system.
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*
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* Copyright (C) 2017 secunet Security Networks AG
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <inttypes.h>
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#include <assert.h>
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#include "pcr.h"
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const uint8_t *sbbar = NULL;
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uint32_t read_pcr32(const uint8_t port, const uint16_t offset)
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{
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assert(sbbar);
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return *(const uint32_t *)(sbbar + (port << 16) + offset);
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}
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void pcr_init(struct pci_dev *const sb)
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{
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bool error_exit = false;
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bool p2sb_revealed = false;
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if (sbbar)
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return;
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struct pci_dev *const p2sb = pci_get_dev(sb->access, 0, 0, 0x1f, 1);
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if (!p2sb) {
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perror("Can't allocate device node for P2SB.");
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exit(1);
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}
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/* do not fill bases here, libpci refuses to refill later */
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pci_fill_info(p2sb, PCI_FILL_IDENT);
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if (p2sb->vendor_id == 0xffff && p2sb->device_id == 0xffff) {
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printf("Trying to reveal Primary to Sideband Bridge "
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"(P2SB),\nlet's hope the OS doesn't mind... ");
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/* Do not use pci_write_long(). Surrounding
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bytes 0xe0 must be maintained. */
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pci_write_byte(p2sb, 0xe0 + 1, 0);
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pci_fill_info(p2sb, PCI_FILL_IDENT | PCI_FILL_RESCAN);
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if (p2sb->vendor_id != 0xffff ||
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p2sb->device_id != 0xffff) {
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printf("done.\n");
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p2sb_revealed = true;
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} else {
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printf("failed.\n");
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exit(1);
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}
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}
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pci_fill_info(p2sb, PCI_FILL_BASES | PCI_FILL_CLASS);
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const pciaddr_t sbbar_phys = p2sb->base_addr[0] & ~0xfULL;
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printf("SBREG_BAR = 0x%08"PRIx64" (MEM)\n\n", (uint64_t)sbbar_phys);
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sbbar = map_physical(sbbar_phys, SBBAR_SIZE);
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if (sbbar == NULL) {
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perror("Error mapping SBREG_BAR");
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error_exit = true;
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}
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if (p2sb_revealed) {
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printf("Hiding Primary to Sideband Bridge (P2SB).\n");
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pci_write_byte(p2sb, 0xe0 + 1, 1);
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}
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pci_free_dev(p2sb);
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if (error_exit)
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exit(1);
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}
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void pcr_cleanup(void)
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{
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if (sbbar)
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unmap_physical((void *)sbbar, SBBAR_SIZE);
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}
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