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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include <bootstate.h>
#include <console/console.h>
#include <cpu/x86/smm.h>
#include <cpu/intel/smm_reloc.h>
#include <intelblocks/pmclib.h>
#include <intelblocks/systemagent.h>
#include <soc/pm.h>
void smm_southbridge_clear_state(void)
{
printk(BIOS_DEBUG, "Clearing SMI status registers\n");
if (pmc_get_smi_en() & APMC_EN) {
printk(BIOS_INFO, "SMI# handler already enabled?\n");
return;
}
/* Dump and clear status registers */
pmc_clear_smi_status();
pmc_clear_pm1_status();
pmc_clear_tco_status();
pmc_clear_all_gpe_status();
}
void smm_southbridge_enable(uint16_t pm1_events)
{
uint32_t smi_params = ENABLE_SMI_PARAMS;
printk(BIOS_DEBUG, "Enabling SMIs.\n");
/* Configure events */
pmc_enable_pm1(pm1_events);
pmc_disable_std_gpe(PME_B0_EN);
/*
* GPEs need to be disabled before enabling SMI. Otherwise, it could
* lead to SMIs being triggered in coreboot preventing the progress of
* normal boot-up. This is done as late as possible so that
* pmc_fill_power_state can read the correct state of GPE0_EN* registers
* and not lose information about the wake source.
*/
pmc_disable_all_gpe();
/*
* Enable SMI generation:
* - on APMC writes (io 0xb2)
* - on writes to SLP_EN (sleep states)
* - on writes to GBL_RLS (bios commands)
* - on eSPI events, unless disabled (does nothing on LPC systems)
* - on TCO events (TIMEOUT, case intrusion, ...), if enabled
* No SMIs:
* - on microcontroller writes (io 0x62/0x66)
*/
if (CONFIG(SOC_INTEL_COMMON_BLOCK_SMM_ESPI_DISABLE))
smi_params &= ~ESPI_SMI_EN;
if (CONFIG(SOC_INTEL_COMMON_BLOCK_SMM_TCO_ENABLE))
smi_params |= TCO_SMI_EN;
/* Enable SMI generation: */
pmc_enable_smi(smi_params);
}
void smm_setup_structures(void *gnvs, void *tcg, void *smi1)
{
/*
* Issue SMI to set the gnvs pointer in SMM.
* tcg and smi1 are unused.
*
* EAX = APM_CNT_GNVS_UPDATE
* EBX = gnvs pointer
* EDX = APM_CNT
*/
asm volatile (
"outb %%al, %%dx\n\t"
: /* ignore result */
: "a" (APM_CNT_GNVS_UPDATE),
"b" ((u32)gnvs),
"d" (APM_CNT)
);
}
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