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system76-coreboot/util/intelmetool/intelmetool.c
Damien Zammit 711a478c05 intelmetool: Fix detection logic of no MEI device 
Previously, on systems that are supposed to have ME but
are librebooted, there was no message printed to tell the user
that no MEI was detected.  Fixed this bug.

Change-Id: I59681c194ae5e76533dd777374e26d1aea727337
Signed-off-by: Damien Zammit <damien@zamaudio.com>
Reviewed-on: https://review.coreboot.org/14334
Tested-by: build bot (Jenkins)
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@googlemail.com>
2016-04-13 17:20:36 +02:00

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8.9 KiB
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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];
int me = 0;
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)) {
me = 1;
break;
}
}
}
if (!me) {
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;
}
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