coreboot-kgpe-d16/util/intelmetool/intelmetool.c

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/* intelmetool Dump interesting things about Management Engine even if hidden
* Copyright (C) 2014 Damien Zammit <damien@zamaudio.com>
*
* 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.
*/
#include <stdio.h>
#include <inttypes.h>
#include <stdlib.h>
#include <getopt.h>
#include <unistd.h>
#ifdef __NetBSD__
#include <machine/sysarch.h>
#endif
#include "me.h"
#include "mmap.h"
#include "intelmetool.h"
#define FD2 0x3428
#define ME_COMMAND_DELAY 10000
extern int fd_mem;
int debug = 0;
static uint32_t fd2 = 0;
static const int size = 0x4000;
static volatile uint8_t *rcba;
static void dumpmem(uint8_t *phys, uint32_t size)
{
uint32_t i;
printf("Dumping cloned ME memory:\n");
for (i = 0; i < size; i++) {
printf("%02X",*((uint8_t *) (phys + i)));
}
printf("\n");
}
static void zeroit(uint8_t *phys, uint32_t size)
{
uint32_t i;
for (i = 0; i < size; i++) {
*((uint8_t *) (phys + i)) = 0x00;
}
}
static void dumpmemfile(uint8_t *phys, uint32_t size)
{
FILE *fp = fopen("medump.bin", "w");
uint32_t i;
for (i = 0; i < size; i++) {
fprintf(fp, "%c", *((uint8_t *) (phys + i)));
}
fclose(fp);
}
static void rehide_me() {
if (fd2 & 0x2) {
printf("Re-hiding MEI device...");
fd2 = *(uint32_t *)(rcba + FD2);
*(uint32_t *)(rcba + FD2) = fd2 | 0x2;
printf("done, ");
}
}
/* You need >4GB total ram, in kernel cmdline, use 'mem=1000m'
* then this code will clone to absolute memory address 0xe0000000
* which can be read using a mmap tool at that offset.
* Real ME memory is located around top of memory minus 64MB. (I think)
* so we avoid cloning to this part.
*/
static void dump_me_memory() {
uint32_t me_clone = 0x60000000;
uint8_t *dump;
dump = map_physical_exact(me_clone, me_clone, 0x2000000);
zeroit(dump, 0x2000000);
printf("Send magic command for memory clone\n");
mei_reset();
usleep(ME_COMMAND_DELAY);
void* ptr = &me_clone;
int err = mkhi_debug_me_memory(ptr);
if (!err) {
printf("Wait a second...");
usleep(ME_COMMAND_DELAY);
printf("done\n\nHere are the first bytes:\n");
dumpmemfile(dump, 0x2000000);
//printf("Try reading 0x%zx with other mmap tool...\n"
// "Press enter to quit, you only get one chance to run this tool before reboot required for some reason\n", me_clone);
while (getc(stdin) != '\n') {};
unmap_physical(dump, 0x2000000);
}
}
static int pci_platform_scan() {
struct pci_access *pacc;
struct pci_dev *dev;
char namebuf[1024], *name;
pacc = pci_alloc();
pacc->method = PCI_ACCESS_I386_TYPE1;
pci_init(pacc);
pci_scan_bus(pacc);
for (dev=pacc->devices; dev; dev=dev->next) {
pci_fill_info(dev, PCI_FILL_IDENT | PCI_FILL_BASES | PCI_FILL_SIZES | PCI_FILL_CLASS);
name = pci_lookup_name(pacc, namebuf, sizeof(namebuf),
PCI_LOOKUP_DEVICE, dev->vendor_id, dev->device_id);
if (dev->vendor_id == 0x8086) {
if (PCI_DEV_HAS_ME_DISABLE(dev->device_id)) {
printf(CGRN "Good news, you have a `%s` so ME is present but can be disabled, continuing...\n\n" RESET, name);
break;
} else if (PCI_DEV_HAS_ME_DIFFICULT(dev->device_id)) {
printf(CRED "Bad news, you have a `%s` so you have ME hardware on board and you can't control or disable it, continuing...\n\n" RESET, name);
break;
} else if (PCI_DEV_CAN_DISABLE_ME_IF_PRESENT(dev->device_id)) {
printf(CYEL "Not sure if ME hardware is present because you have a `%s`, but it is possible to disable it if you do, continuing...\n\n" RESET, name);
break;
} else if (PCI_DEV_ME_NOT_SURE(dev->device_id)) {
printf(CYEL "Found `%s`. Not sure whether you have ME hardware, exiting\n\n" RESET, name);
pci_cleanup(pacc);
return 1;
break;
}
}
}
if (!PCI_DEV_HAS_ME_DISABLE(dev->device_id) &&
!PCI_DEV_HAS_ME_DIFFICULT(dev->device_id) &&
!PCI_DEV_CAN_DISABLE_ME_IF_PRESENT(dev->device_id) &&
!PCI_DEV_ME_NOT_SURE(dev->device_id)) {
printf(CCYN "ME is not present on your board or unkown\n\n" RESET);
pci_cleanup(pacc);
return 1;
}
pci_cleanup(pacc);
return 0;
}
static struct pci_dev *pci_me_interface_scan(char **name) {
struct pci_access *pacc;
struct pci_dev *dev;
char namebuf[1024];
pacc = pci_alloc();
pacc->method = PCI_ACCESS_I386_TYPE1;
pci_init(pacc);
pci_scan_bus(pacc);
for (dev=pacc->devices; dev; dev=dev->next) {
pci_fill_info(dev, PCI_FILL_IDENT | PCI_FILL_BASES | PCI_FILL_SIZES | PCI_FILL_CLASS);
*name = pci_lookup_name(pacc, namebuf, sizeof(namebuf),
PCI_LOOKUP_DEVICE, dev->vendor_id, dev->device_id);
if (dev->vendor_id == 0x8086) {
if (PCI_DEV_HAS_SUPPORTED_ME(dev->device_id)) {
break;
}
}
}
if (!PCI_DEV_HAS_SUPPORTED_ME(dev->device_id)) {
rehide_me();
printf("MEI device not found\n");
pci_cleanup(pacc);
return NULL;
}
return dev;
}
static int activate_me() {
struct pci_access *pacc;
struct pci_dev *sb;
uint32_t rcba_phys;
pacc = pci_alloc();
pacc->method = PCI_ACCESS_I386_TYPE1;
pci_init(pacc);
pci_scan_bus(pacc);
sb = pci_get_dev(pacc, 0, 0, 0x1f, 0);
if (!sb) {
printf("Uh oh, southbridge not on BDF(0:31:0), please report this error, exiting.\n");
pci_cleanup(pacc);
return 1;
}
pci_fill_info(sb, PCI_FILL_IDENT | PCI_FILL_BASES | PCI_FILL_SIZES | PCI_FILL_CLASS);
rcba_phys = pci_read_long(sb, 0xf0) & 0xfffffffe;
rcba = map_physical(rcba_phys, size);
//printf("RCBA at 0x%08" PRIx32 "\n", (uint32_t)rcba_phys);
fd2 = *(uint32_t *)(rcba + FD2);
*(uint32_t *)(rcba + FD2) = fd2 & ~0x2;
if (fd2 & 0x2) {
printf("MEI was hidden on PCI, now unlocked\n");
} else {
printf("MEI not hidden on PCI, checking if visible\n");
}
pci_cleanup(pacc);
return 0;
}
static void dump_me_info() {
struct pci_dev *dev;
uint32_t stat, stat2;
char *name;
if (pci_platform_scan()) {
exit(1);
}
dev = pci_me_interface_scan(&name);
if (!dev) {
exit(1);
}
if (activate_me()) {
exit(1);
}
printf("MEI found: [%x:%x] %s\n\n", dev->vendor_id, dev->device_id, name);
stat = pci_read_long(dev, 0x40);
printf("ME Status : 0x%x\n", stat);
stat2 = pci_read_long(dev, 0x48);
printf("ME Status 2 : 0x%x\n\n", stat2);
intel_me_status(stat, stat2);
printf("\n");
intel_me_extend_valid(dev);
printf("\n");
if ((stat & 0xf000) >> 12 != 0) {
printf("ME: has a broken implementation on your board with this BIOS\n");
}
intel_mei_setup(dev);
usleep(ME_COMMAND_DELAY);
mei_reset();
usleep(ME_COMMAND_DELAY);
mkhi_get_fw_version();
usleep(ME_COMMAND_DELAY);
mei_reset();
usleep(ME_COMMAND_DELAY);
mkhi_get_fwcaps();
usleep(ME_COMMAND_DELAY);
rehide_me();
munmap((void*)rcba, size);
}
static void print_version(void)
{
printf("intelmetool v%s -- ", INTELMETOOL_VERSION);
printf("Copyright (C) 2015 Damien Zammit\n\n");
printf(
"This program is free software: you can redistribute it and/or modify\n"
"it under the terms of the GNU General Public License as published by\n"
"the Free Software Foundation, version 2 of the License.\n\n"
"This program is distributed in the hope that it will be useful,\n"
"but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
"MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n"
"GNU General Public License for more details.\n\n");
}
static void print_usage(const char *name)
{
printf("usage: %s [-vh?sd]\n", name);
printf("\n"
" -v | --version: print the version\n"
" -h | --help: print this help\n\n"
" -s | --show: dump all me information on console\n"
" -d | --debug: enable debug output\n"
"\n");
exit(1);
}
int main(int argc, char *argv[])
{
int opt, option_index = 0;
unsigned cmd_exec = 0;
static struct option long_options[] = {
{"version", 0, 0, 'v'},
{"help", 0, 0, 'h'},
{"show", 0, 0, 's'},
{"debug", 0, 0, 'd'},
{0, 0, 0, 0}
};
while ((opt = getopt_long(argc, argv, "vh?sd",
long_options, &option_index)) != EOF) {
switch (opt) {
case 'v':
print_version();
exit(0);
break;
case 's':
cmd_exec = 1;
break;
case 'd':
debug = 1;
break;
case 'h':
case '?':
default:
print_usage(argv[0]);
exit(0);
break;
}
}
#if defined(__FreeBSD__)
if (open("/dev/io", O_RDWR) < 0) {
perror("/dev/io");
#elif defined(__NetBSD__)
# ifdef __i386__
if (i386_iopl(3)) {
perror("iopl");
# else
if (x86_64_iopl(3)) {
perror("iopl");
# endif
#else
if (iopl(3)) {
perror("iopl");
#endif
printf("You need to be root.\n");
exit(1);
}
#ifndef __DARWIN__
if ((fd_mem = open("/dev/mem", O_RDWR)) < 0) {
perror("Can not open /dev/mem");
exit(1);
}
#endif
switch(cmd_exec) {
case 1:
dump_me_info();
break;
default:
print_usage(argv[0]);
break;
}
return 0;
}