From 9cd99a1524cd8c7cd6100cfc9d68e85eea5ac265 Mon Sep 17 00:00:00 2001 From: Subrata Banik Date: Mon, 28 May 2018 16:12:03 +0530 Subject: soc/intel/common/pch: Add pch lockdown code pch lockdown functionality can be used by supported PCH. Right now pch lockdown functionality is applied for SPT (Skylake SOC) and CNP(Cannon Lake SOC) PCH. BUG=b:78109109 BRANCH=none TEST=Build and boot KBL and CNL platform. Change-Id: I0b81bbc54f737cb4e7120f44bbe705039b45ccb3 Signed-off-by: Maulik V Vaghela Signed-off-by: Subrata Banik Reviewed-on: https://review.coreboot.org/25688 Tested-by: build bot (Jenkins) Reviewed-by: Furquan Shaikh --- src/soc/intel/common/pch/lockdown/Kconfig | 7 ++ src/soc/intel/common/pch/lockdown/Makefile.inc | 1 + src/soc/intel/common/pch/lockdown/lockdown.c | 107 +++++++++++++++++++++++++ 3 files changed, 115 insertions(+) create mode 100644 src/soc/intel/common/pch/lockdown/Kconfig create mode 100644 src/soc/intel/common/pch/lockdown/Makefile.inc create mode 100644 src/soc/intel/common/pch/lockdown/lockdown.c (limited to 'src/soc/intel/common/pch/lockdown') diff --git a/src/soc/intel/common/pch/lockdown/Kconfig b/src/soc/intel/common/pch/lockdown/Kconfig new file mode 100644 index 0000000000..8fce5e785c --- /dev/null +++ b/src/soc/intel/common/pch/lockdown/Kconfig @@ -0,0 +1,7 @@ +config SOC_INTEL_COMMON_PCH_LOCKDOWN + bool + default n + help + This option allows to have chipset lockdown for DMI, FAST_SPI and + soc_lockdown_config() to implement any additional lockdown as PMC, + LPC for supported PCH. diff --git a/src/soc/intel/common/pch/lockdown/Makefile.inc b/src/soc/intel/common/pch/lockdown/Makefile.inc new file mode 100644 index 0000000000..f4663f569a --- /dev/null +++ b/src/soc/intel/common/pch/lockdown/Makefile.inc @@ -0,0 +1 @@ +ramstage-$(CONFIG_SOC_INTEL_COMMON_PCH_LOCKDOWN) += lockdown.c diff --git a/src/soc/intel/common/pch/lockdown/lockdown.c b/src/soc/intel/common/pch/lockdown/lockdown.c new file mode 100644 index 0000000000..f37d00117e --- /dev/null +++ b/src/soc/intel/common/pch/lockdown/lockdown.c @@ -0,0 +1,107 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2018 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define PCR_DMI_GCS 0x274C +#define PCR_DMI_GCS_BILD (1 << 0) + +/* + * This function will get lockdown config specific to soc. + * + * Return values: + * 0 = CHIPSET_LOCKDOWN_FSP = use FSP's lockdown functionality to lockdown IPs + * 1 = CHIPSET_LOCKDOWN_COREBOOT = Use coreboot to lockdown IPs + */ +int get_lockdown_config(void) +{ + const struct soc_intel_common_config *common_config; + common_config = chip_get_common_soc_structure(); + + return common_config->chipset_lockdown; +} + +static void dmi_lockdown_cfg(void) +{ + /* + * GCS reg of DMI + * + * When set, prevents GCS.BBS from being changed + * GCS.BBS: (Boot BIOS Strap) This field determines the destination + * of accesses to the BIOS memory range. + * Bits Description + * "0b": SPI + * "1b": LPC/eSPI + */ + pcr_or8(PID_DMI, PCR_DMI_GCS, PCR_DMI_GCS_BILD); +} + +static void fast_spi_lockdown_cfg(int chipset_lockdown) +{ + if (!IS_ENABLED(CONFIG_SOC_INTEL_COMMON_BLOCK_FAST_SPI)) + return; + + /* Set FAST_SPI opcode menu */ + fast_spi_set_opcode_menu(); + + /* Discrete Lock Flash PR registers */ + fast_spi_pr_dlock(); + + /* Lock FAST_SPIBAR */ + fast_spi_lock_bar(); + + /* Set Bios Interface Lock, Bios Lock */ + if (chipset_lockdown == CHIPSET_LOCKDOWN_COREBOOT) { + /* Bios Interface Lock */ + fast_spi_set_bios_interface_lock_down(); + + /* Bios Lock */ + fast_spi_set_lock_enable(); + } +} + +/* + * platform_lockdown_config has 2 major part. + * 1. Common SoC lockdown configuration. + * 2. SoC specific lockdown configuration as per Silicon + * guideline. + */ +static void platform_lockdown_config(void *unused) +{ + int chipset_lockdown; + chipset_lockdown = get_lockdown_config(); + + /* SPI lock down configuration */ + fast_spi_lockdown_cfg(chipset_lockdown); + + /* DMI lock down configuration */ + dmi_lockdown_cfg(); + + /* SoC lock down configuration */ + soc_lockdown_config(chipset_lockdown); +} + +BOOT_STATE_INIT_ENTRY(BS_DEV_RESOURCES, BS_ON_EXIT, platform_lockdown_config, + NULL); -- cgit v1.2.3