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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include <device/device.h>
#include <device/pci.h>
#include <console/console.h>
#include <arch/io.h>
#include <cpu/x86/smm.h>
#include <cpu/intel/smm_reloc.h>
#include <soc/iomap.h>
#include <soc/soc_util.h>
#include <soc/pm.h>
#include <soc/smm.h>
void smm_southbridge_clear_state(void)
{
uint32_t smi_en;
printk(BIOS_DEBUG, "Initializing Southbridge SMI...");
printk(BIOS_SPEW, " pmbase = 0x%04x\n", get_pmbase());
smi_en = inl((uint16_t)(get_pmbase() + SMI_EN));
if (smi_en & APMC_EN) {
printk(BIOS_INFO, "SMI# handler already enabled?\n");
return;
}
/* Dump and clear status registers */
clear_smi_status();
clear_pm1_status();
clear_tco_status();
clear_gpe_status();
clear_pmc_status();
}
void smm_southbridge_enable_smi(void)
{
printk(BIOS_DEBUG, "Enabling SMIs.\n");
/* Configure events Disable PCIe wake. */
enable_pm1(PWRBTN_EN | GBL_EN | PCIEXPWAK_DIS);
disable_gpe(PME_B0_EN);
/* Enable SMI generation:
* - on APMC writes (io 0xb2)
* - on writes to SLP_EN (sleep states)
* - on writes to GBL_RLS (bios commands)
* No SMIs:
* - on TCO events
* - on microcontroller writes (io 0x62/0x66)
*/
enable_smi(APMC_EN | SLP_SMI_EN | GBL_SMI_EN | EOS);
}
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"((uint32_t)gnvs),
"d"(APM_CNT));
}
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