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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2008-2009 coresystems GmbH
* Copyright (C) 2014 Google Inc.
* Copyright (C) 2015 Intel Corporation.
*
* 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 <bootstate.h>
#include <device/device.h>
#include <device/pci.h>
#include <console/console.h>
#include <arch/io.h>
#include <cpu/cpu.h>
#include <cpu/x86/cache.h>
#include <cpu/x86/smm.h>
#include <intelblocks/pmclib.h>
#include <string.h>
#include <soc/iomap.h>
#include <soc/pch.h>
#include <soc/pm.h>
#include <soc/smm.h>
void southbridge_smm_clear_state(void)
{
u32 smi_en;
printk(BIOS_DEBUG, "Initializing Southbridge SMI...");
printk(BIOS_SPEW, " ... pmbase = 0x%04x\n", ACPI_BASE_ADDRESS);
smi_en = inl(ACPI_BASE_ADDRESS + SMI_EN);
if (smi_en & APMC_EN) {
printk(BIOS_INFO, "SMI# handler already enabled?\n");
return;
}
printk(BIOS_DEBUG, "\n");
/* Dump and clear status registers */
pmc_clear_smi_status();
pmc_clear_pm1_status();
pmc_clear_tco_status();
pmc_clear_all_gpe_status();
}
void southbridge_smm_enable_smi(void)
{
printk(BIOS_DEBUG, "Enabling SMIs.\n");
/* Configure events */
pmc_enable_pm1(GBL_EN);
pmc_disable_std_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)
* - on eSPI events (does nothing on LPC systems)
* No SMIs:
* - on microcontroller writes (io 0x62/0x66)
* - on TCO events
*/
pmc_enable_smi(APMC_EN | SLP_SMI_EN | GBL_SMI_EN | ESPI_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" ((u32)gnvs),
"d" (APM_CNT)
);
}
static void pm1_enable_pwrbtn_smi(void *unused)
{
/*
* Enable power button SMI only before jumping to payload. This ensures
* that:
* 1. Power button SMI is enabled only after coreboot is done.
* 2. On resume path, power button SMI is not enabled and thus avoids
* any shutdowns because of power button presses due to power button
* press in resume path.
*/
pmc_update_pm1_enable(PWRBTN_EN);
}
BOOT_STATE_INIT_ENTRY(BS_PAYLOAD_LOAD, BS_ON_EXIT, pm1_enable_pwrbtn_smi, NULL);
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