static void fsp_notify_dummy(void *arg)
{
enum fsp_notify_phase ph = (enum fsp_notify_phase) arg;
enum fsp_status ret;
if ((ret = fsp_notify(ph)) != FSP_SUCCESS) {
printk(BIOS_CRIT, "FspNotify failed, ret = %x!\n", ret);
fsp_handle_reset(ret);
}
/* Call END_OF_FIRMWARE Notify after READY_TO_BOOT Notify */
if (ph == READY_TO_BOOT) {
fsp_notify_dummy((void *)END_OF_FIRMWARE);
/* Hide the P2SB device to align with previous behavior. */
p2sb_hide();
}
}
static void pch_disable_heci(void)
{
struct pcr_sbi_msg msg = {
.pid = PID_CSME0,
.offset = 0,
.opcode = PCR_WRITE,
.is_posted = false,
.fast_byte_enable = CSME0_FBE,
.bar = CSME0_BAR,
.fid = CSME0_FID
};
/* Bit 0: Set to make HECI#1 Function disable */
uint32_t data32 = 1;
uint8_t response;
int status;
/* unhide p2sb device */
p2sb_unhide();
/* Send SBI command to make HECI#1 function disable */
status = pcr_execute_sideband_msg(&msg, &data32, &response);
if (status && response)
printk(BIOS_ERR, "Fail to make CSME function disable\n");
/* Ensure to Lock SBI interface after this command */
p2sb_disable_sideband_access();
/* hide p2sb device */
p2sb_hide();
}
/*
* Specific SOC SMI handler during ramstage finalize phase
*
* BIOS can't make CSME function disable as is due to POSTBOOT_SAI
* restriction in place from CNP chipset. Hence create SMI Handler to
* perform CSME function disabling logic during SMM mode.
*/
void smihandler_soc_at_finalize(void)
{
const struct soc_intel_cannonlake_config *config;
const struct device *dev = dev_find_slot(0, PCH_DEVFN_CSE);
if (!dev || !dev->chip_info) {
printk(BIOS_ERR, "%s: Could not find SoC devicetree config!\n",
__func__);
return ;
}
config = dev->chip_info;
if (config->HeciEnabled == 0)
pch_disable_heci();
}
void smihandler_soc_check_illegal_access(uint32_t tco_sts)
{
if (!((tco_sts & (1 << 8)) && CONFIG(SPI_FLASH_SMM)
&& fast_spi_wpd_status()))
return;
/*
* BWE is RW, so the SMI was caused by a
* write to BWE, not by a write to the BIOS
*
* This is the place where we notice someone
* is trying to tinker with the BIOS. We are
* trying to be nice and just ignore it. A more
* resolute answer would be to power down the
* box.
*/
printk(BIOS_DEBUG, "Switching back to RO\n");
fast_spi_enable_wp();
}
/* SMI handlers that should be serviced in SCI mode too. */
uint32_t smihandler_soc_get_sci_mask(void)
{
uint32_t sci_mask =
SMI_HANDLER_SCI_EN(APM_STS_BIT) |
SMI_HANDLER_SCI_EN(SMI_ON_SLP_EN_STS_BIT);
return sci_mask;
}
void platform_fsp_notify_status(enum fsp_notify_phase phase)
{
/* Hide the P2SB device to align with previous behavior. */
if (phase == END_OF_FIRMWARE)
p2sb_hide();
}
