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/* SPDX-License-Identifier: GPL-2.0-only */
#include <device/mmio.h>
#include <bootstate.h>
#include <commonlib/region.h>
#include <console/console.h>
#include <fmap.h>
#include <intelblocks/cse.h>
#include <intelblocks/p2sb.h>
#include <intelblocks/pcr.h>
#include <soc/heci.h>
#include <soc/iomap.h>
#include <soc/pcr_ids.h>
#include <soc/pci_devs.h>
#include <device/pci_ops.h>
#include <stdint.h>
#define MKHI_GROUP_ID_MCA 0x0a
#define READ_FILE 0x02
#define READ_FILE_FLAG_DEFAULT (1 << 0)
#define READ_FILE_FLAG_HASH (1 << 1)
#define READ_FILE_FLAG_EMULATED (1 << 2)
#define READ_FILE_FLAG_HW (1 << 3)
#define MCA_MAX_FILE_PATH_SIZE 64
#define FUSE_LOCK_FILE "/fpf/intel/SocCfgLock"
/* Status values are made in such a way erase is not needed */
static enum fuse_flash_state {
FUSE_FLASH_FUSED = 0xfc,
FUSE_FLASH_UNFUSED = 0xfe,
FUSE_FLASH_UNKNOWN = 0xff,
} g_fuse_state;
#define FPF_STATUS_FMAP "FPF_STATUS"
/*
* Read file from CSE internal filesystem.
* size is maximum length of provided buffer buff, which is updated with actual
* size of the file read. flags indicate whether real file or fuse is used.
* Returns 1 on success and 0 otherwise.
*/
static int read_cse_file(const char *path, void *buff, size_t *size,
size_t offset, uint32_t flags)
{
int res;
size_t reply_size;
struct mca_command {
struct mkhi_hdr hdr;
char file_name[MCA_MAX_FILE_PATH_SIZE];
uint32_t offset;
uint32_t data_size;
uint8_t flags;
} __packed msg;
struct mca_response {
struct mkhi_hdr hdr;
uint32_t data_size;
uint8_t buffer[128];
} __packed rmsg;
if (sizeof(rmsg.buffer) < *size) {
printk(BIOS_ERR, "internal buffer is too small\n");
return 0;
}
if (strnlen(path, sizeof(msg.file_name)) >= sizeof(msg.file_name)) {
printk(BIOS_ERR, "path too big for msg.file_name buffer\n");
return 0;
}
strncpy(msg.file_name, path, sizeof(msg.file_name));
msg.hdr.group_id = MKHI_GROUP_ID_MCA;
msg.hdr.command = READ_FILE;
msg.flags = flags;
msg.data_size = *size;
msg.offset = offset;
res = heci_send(&msg, sizeof(msg), BIOS_HOST_ADDR, HECI_MKHI_ADDR);
if (!res) {
printk(BIOS_ERR, "failed to send HECI message\n");
return 0;
}
reply_size = sizeof(rmsg);
res = heci_receive(&rmsg, &reply_size);
if (!res) {
printk(BIOS_ERR, "failed to receive HECI reply\n");
return 0;
}
if (rmsg.data_size > *size) {
printk(BIOS_ERR, "reply is too large\n");
return 0;
}
memcpy(buff, rmsg.buffer, rmsg.data_size);
*size = rmsg.data_size;
return 1;
}
static enum fuse_flash_state load_cached_fpf(struct region_device *rdev)
{
enum fuse_flash_state state;
uint8_t buff;
state = FUSE_FLASH_UNKNOWN;
if (rdev_readat(rdev, &buff, 0, sizeof(buff)) >= 0) {
state = read8(&buff);
return state;
}
printk(BIOS_WARNING, "failed to load cached FPF value\n");
return state;
}
static
int save_fpf_state(enum fuse_flash_state state, struct region_device *rdev)
{
uint8_t buff;
write8(&buff, (uint8_t) state);
return rdev_writeat(rdev, &buff, 0, sizeof(buff));
}
static void fpf_blown(void *unused)
{
uint8_t fuse;
struct region_device rdev;
size_t sz = sizeof(fuse);
bool rdev_valid = false;
if (fmap_locate_area_as_rdev_rw(FPF_STATUS_FMAP, &rdev) == 0) {
rdev_valid = true;
g_fuse_state = load_cached_fpf(&rdev);
if (g_fuse_state != FUSE_FLASH_UNKNOWN)
return;
}
if (!read_cse_file(FUSE_LOCK_FILE, &fuse, &sz, 0, READ_FILE_FLAG_HW))
return;
g_fuse_state = fuse == 1 ? FUSE_FLASH_FUSED : FUSE_FLASH_UNFUSED;
if (rdev_valid && (save_fpf_state(g_fuse_state, &rdev) < 0))
printk(BIOS_CRIT, "failed to save FPF state\n");
}
static uint32_t dump_status(int index, int reg_addr)
{
uint32_t reg;
reg = me_read_config32(reg_addr);
printk(BIOS_DEBUG, "CSE FWSTS%d: 0x%08x\n", index, reg);
return reg;
}
static void dump_cse_state(void)
{
uint32_t fwsts1;
if (!is_cse_enabled())
return;
fwsts1 = dump_status(1, PCI_ME_HFSTS1);
dump_status(2, PCI_ME_HFSTS2);
dump_status(3, PCI_ME_HFSTS3);
dump_status(4, PCI_ME_HFSTS4);
dump_status(5, PCI_ME_HFSTS5);
dump_status(6, PCI_ME_HFSTS6);
/* Minimal decoding is done here in order to call out most important
pieces. Manufacturing mode needs to be locked down prior to shipping
the product so it's called out explicitly. */
printk(BIOS_DEBUG, "ME: Manufacturing Mode : %s\n",
(fwsts1 & (1 << 0x4)) ? "YES" : "NO");
printk(BIOS_DEBUG, "ME: FPF status : ");
switch (g_fuse_state) {
case FUSE_FLASH_UNFUSED:
printk(BIOS_DEBUG, "unfused");
break;
case FUSE_FLASH_FUSED:
printk(BIOS_DEBUG, "fused");
break;
default:
case FUSE_FLASH_UNKNOWN:
printk(BIOS_DEBUG, "unknown");
}
printk(BIOS_DEBUG, "\n");
}
#define PCR_PSFX_T0_SHDW_PCIEN 0x1C
#define PCR_PSFX_T0_SHDW_PCIEN_FUNDIS (1 << 8)
static void disable_heci1(void)
{
pcr_or32(PID_PSF3, PSF3_BASE_ADDRESS + PCR_PSFX_T0_SHDW_PCIEN,
PCR_PSFX_T0_SHDW_PCIEN_FUNDIS);
}
void heci_cse_lockdown(void)
{
dump_cse_state();
/*
* It is safe to disable HECI1 now since we won't be talking to the ME
* anymore.
*/
disable_heci1();
}
BOOT_STATE_INIT_ENTRY(BS_DEV_INIT, BS_ON_ENTRY, fpf_blown, NULL);
BOOT_STATE_INIT_ENTRY(BS_DEV_INIT, BS_ON_EXIT, print_me_fw_version, NULL);
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