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authorMarshall Dawson <marshalldawson3rd@gmail.com>2017-09-21 12:27:12 -0600
committerAaron Durbin <adurbin@chromium.org>2017-09-27 16:29:05 +0000
commit18b477ea4108335eb6d5a4b6f39578cbe5525ac1 (patch)
tree2ef2c1813fd6e7c828c498700809dc95d21bb55a /src/soc/amd
parent9db8a44081543088caa3f396b570c538064f2fe6 (diff)
downloadcoreboot-18b477ea4108335eb6d5a4b6f39578cbe5525ac1.tar.xz
soc/amd/stoneyridge: Add postcar stage
Insert a postcar stage for Stoney Ridge and move romstage's CAR teardown there. The AMD cache-as-ram teardown procedure currently uses a wbinvd instruction to send CAR contents to DRAM backing. This allows preserving stack contents and CAR globals after the teardown happens, but likely results in memory corruption during S3 resume. Due to the current base of the DCACHE region, reverting to an invd instruction will break the detection mechanism for CAR migrated variables. Using postcar avoids this problem. The current behavior of AGESA is to set up all cores' MTRRs during the AmdInitPost() entry point. This implementation takes control back and causes postcar's _start to clear all settings and set attributes only for the BIOS flash device, TSEG, and enough space below cbmem_top to load and run ramstage. BUG=b:64768556 Change-Id: I1045446655b81b806d75903d75288ab17b5e77d1 Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com> Reviewed-on: https://review.coreboot.org/20966 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Diffstat (limited to 'src/soc/amd')
-rw-r--r--src/soc/amd/common/block/cpu/Makefile.inc1
-rw-r--r--src/soc/amd/stoneyridge/Kconfig3
-rw-r--r--src/soc/amd/stoneyridge/Makefile.inc3
-rw-r--r--src/soc/amd/stoneyridge/include/soc/northbridge.h4
-rw-r--r--src/soc/amd/stoneyridge/romstage.c44
5 files changed, 45 insertions, 10 deletions
diff --git a/src/soc/amd/common/block/cpu/Makefile.inc b/src/soc/amd/common/block/cpu/Makefile.inc
index 8e6972ed0a..ecc9afbc6f 100644
--- a/src/soc/amd/common/block/cpu/Makefile.inc
+++ b/src/soc/amd/common/block/cpu/Makefile.inc
@@ -1,2 +1,3 @@
bootblock-$(CONFIG_SOC_AMD_COMMON_BLOCK_CAR) += car/cache_as_ram.S
+postcar-$(CONFIG_SOC_AMD_COMMON_BLOCK_CAR) += car/exit_car.S
romstage-$(CONFIG_SOC_AMD_COMMON_BLOCK_CAR) += car/exit_car.S
diff --git a/src/soc/amd/stoneyridge/Kconfig b/src/soc/amd/stoneyridge/Kconfig
index beba741c4f..807db25f54 100644
--- a/src/soc/amd/stoneyridge/Kconfig
+++ b/src/soc/amd/stoneyridge/Kconfig
@@ -53,6 +53,9 @@ config CPU_SPECIFIC_OPTIONS
select PARALLEL_MP
select HAVE_SMI_HANDLER
select SMM_TSEG
+ select RELOCATABLE_RAMSTAGE
+ select POSTCAR_STAGE
+ select POSTCAR_CONSOLE
config VBOOT
select AMDFW_OUTSIDE_CBFS
diff --git a/src/soc/amd/stoneyridge/Makefile.inc b/src/soc/amd/stoneyridge/Makefile.inc
index 5d8973616a..0fd318bfa6 100644
--- a/src/soc/amd/stoneyridge/Makefile.inc
+++ b/src/soc/amd/stoneyridge/Makefile.inc
@@ -63,6 +63,9 @@ verstage-y += reset.c
verstage-$(CONFIG_STONEYRIDGE_UART) += uart.c
verstage-y += tsc_freq.c
+postcar-$(CONFIG_STONEYRIDGE_UART) += uart.c
+postcar-y += ramtop.c
+
ramstage-y += chip.c
ramstage-y += cpu.c
ramstage-$(CONFIG_USBDEBUG) += enable_usbdebug.c
diff --git a/src/soc/amd/stoneyridge/include/soc/northbridge.h b/src/soc/amd/stoneyridge/include/soc/northbridge.h
index f952186d22..45c67c22fd 100644
--- a/src/soc/amd/stoneyridge/include/soc/northbridge.h
+++ b/src/soc/amd/stoneyridge/include/soc/northbridge.h
@@ -17,7 +17,6 @@
#ifndef __PI_STONEYRIDGE_NORTHBRIDGE_H__
#define __PI_STONEYRIDGE_NORTHBRIDGE_H__
-#include <arch/cpu.h>
#include <arch/io.h>
#include <device/device.h>
@@ -58,7 +57,4 @@ void domain_set_resources(device_t dev);
void fam15_finalize(void *chip_info);
void setup_uma_memory(void);
-/* todo: remove this when postcar stage is in place */
-asmlinkage void chipset_teardown_car(void);
-
#endif /* __PI_STONEYRIDGE_NORTHBRIDGE_H__ */
diff --git a/src/soc/amd/stoneyridge/romstage.c b/src/soc/amd/stoneyridge/romstage.c
index 6769a262f0..8cd4d43942 100644
--- a/src/soc/amd/stoneyridge/romstage.c
+++ b/src/soc/amd/stoneyridge/romstage.c
@@ -2,6 +2,7 @@
* This file is part of the coreboot project.
*
* Copyright (C) 2015-2016 Advanced Micro Devices, Inc.
+ * Copyright (C) 2015 Intel Corp.
*
* 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
@@ -13,10 +14,12 @@
* GNU General Public License for more details.
*/
+#include <arch/cpu.h>
#include <cpu/x86/msr.h>
#include <cpu/x86/mtrr.h>
#include <cpu/amd/mtrr.h>
#include <cbmem.h>
+#include <commonlib/helpers.h>
#include <console/console.h>
#include <program_loading.h>
#include <agesawrapper.h>
@@ -27,6 +30,11 @@
asmlinkage void car_stage_entry(void)
{
+ struct postcar_frame pcf;
+ uintptr_t top_of_ram;
+ void *smm_base;
+ size_t smm_size;
+ uintptr_t tseg_base;
msr_t base, mask;
msr_t mtrr_cap = rdmsr(MTRR_CAP_MSR);
int vmtrrs = mtrr_cap.lo & MTRR_CAP_VCNT;
@@ -70,14 +78,38 @@ asmlinkage void car_stage_entry(void)
post_code(0x43);
cbmem_initialize_empty();
+ post_code(0x44);
+ if (postcar_frame_init(&pcf, 1 * KiB))
+ die("Unable to initialize postcar frame.\n");
+
+ /*
+ * We need to make sure ramstage will be run cached. At this point exact
+ * location of ramstage in cbmem is not known. Instruct postcar to cache
+ * 16 megs under cbmem top which is a safe bet to cover ramstage.
+ */
+ top_of_ram = (uintptr_t) cbmem_top();
+ /* cbmem_top() needs to be at least 16 MiB aligned */
+ assert(ALIGN_DOWN(top_of_ram, 16*MiB) == top_of_ram);
+ postcar_frame_add_mtrr(&pcf, top_of_ram - 16*MiB, 16*MiB,
+ MTRR_TYPE_WRBACK);
+
+ /* Cache the memory-mapped boot media. */
+ postcar_frame_add_mtrr(&pcf, -CONFIG_ROM_SIZE, CONFIG_ROM_SIZE,
+ MTRR_TYPE_WRPROT);
+
/*
- * This writes contents to DRAM backing before teardown.
- * todo: move CAR teardown to postcar implementation.
+ * Cache the TSEG region at the top of ram. This region is
+ * not restricted to SMM mode until SMM has been relocated.
+ * By setting the region to cacheable it provides faster access
+ * when relocating the SMM handler as well as using the TSEG
+ * region for other purposes.
*/
- chipset_teardown_car();
+ smm_region_info(&smm_base, &smm_size);
+ tseg_base = (uintptr_t)smm_base;
+ postcar_frame_add_mtrr(&pcf, tseg_base, smm_size, MTRR_TYPE_WRBACK);
- post_code(0x50);
- run_ramstage();
+ post_code(0x45);
+ run_postcar_phase(&pcf);
- post_code(0x54); /* Should never see this post code. */
+ post_code(0x50); /* Should never see this post code. */
}