Alexandru Gagniuc (mr.nuke.me@gmail.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/1245
-gerrit
commit 1ae90fd40b81c25c236ee8fb637e0d2d3efefe64 Author: Alexandru Gagniuc mr.nuke.me@gmail.com Date: Fri Jul 20 00:11:21 2012 -0500
RFC: buildsystem: Make CPU microcode updating more configurable
This patch aims to improve the microcode in CBFS handling that was implemented in the last patches from Stefan and the Chromium team.
When the CPU selects MICROCODE_IN_CBFS, the user is given three choices in Kconfig - 1) Generate microcode from tree (default) - 2) Include external microcode file - 3) Do not put microcode in CBFS
The idea is to give the user full control over including non-free blobs in the final ROM image.
The idea is to create a special class, cpu_microcode, which we can use to specify microcode files as such:
cpu_microcode-y += microcode_file.c
These files would then be compiled and assembled into a binary CBFS file. the advantage of doing it this way versus the current method is that 1) The rule is CPU-agnostic 2) The only Kconfig variable needed by the CPU is CPU_MICROCODE_IN_CBFS, which will later be eliminated as all CPUs are converted to CBFS loading 3) We sould be able to eliminate cpu_microcode_blob.bin as a dependency when no cpu_microcode-y is specified, thus eliminating the need for CPU_MICROCODE_IN_CBFS. 4) The rules for building the microcode binary are kept in src/cpu/Makefile.inc, and thus would not clobber the other makefiles, which are already overloaded and very difficult to navigate.
The implementation is at the moment, clumsy and disfunctional. Suggestions are welcome.
Change-Id: I38d0c9851691aa112e93031860e94895857ebb76 Signed-off-by: Alexandru Gagniuc mr.nuke.me@gmail.com --- Makefile.inc | 2 +- src/arch/x86/Makefile.inc | 29 +++++----- src/cpu/Kconfig | 88 ++++++++++++++++++++++++++- src/cpu/Makefile.inc | 25 ++++++++ src/cpu/intel/microcode/Makefile.inc | 20 ++----- src/cpu/intel/microcode/microcode.c | 8 +- src/cpu/intel/microcode/microcode_blob.c | 22 ------- src/cpu/intel/model_206ax/Kconfig | 5 +- src/cpu/intel/model_206ax/Makefile.inc | 2 + src/cpu/intel/model_206ax/microcode_blob.c | 22 +++++++ src/include/cpu/intel/microcode.h | 2 +- 11 files changed, 159 insertions(+), 66 deletions(-)
diff --git a/Makefile.inc b/Makefile.inc index 176ff67..4122bc4 100644 --- a/Makefile.inc +++ b/Makefile.inc @@ -59,7 +59,7 @@ subdirs-y += site-local
####################################################################### # Add source classes and their build options -classes-y := ramstage romstage driver smm +classes-y := ramstage romstage driver smm cpu_microcode
romstage-c-ccopts:=-D__PRE_RAM__ romstage-S-ccopts:=-D__PRE_RAM__ diff --git a/src/arch/x86/Makefile.inc b/src/arch/x86/Makefile.inc index 306f239..b2e7b0e 100644 --- a/src/arch/x86/Makefile.inc +++ b/src/arch/x86/Makefile.inc @@ -1,6 +1,8 @@ +################################################################################ ## ## This file is part of the coreboot project. ## +## Copyright (C) 2012 Alexandru Gagniuc mr.nuke.me@gmail.com ## Copyright (C) 2009-2010 coresystems GmbH ## Copyright (C) 2009 Ronald G. Minnich ## @@ -17,8 +19,8 @@ ## along with this program; if not, write to the Free Software ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA ## +################################################################################
-####################################################################### # Take care of subdirectories subdirs-y += boot # subdirs-y += init @@ -34,13 +36,10 @@ cmos_layout.bin-type = 0x01aa OPTION_TABLE_H:=$(obj)/option_table.h endif
-ifeq ($(CONFIG_MICROCODE_IN_CBFS),y) -cbfs-files-y += microcode_blob.bin -microcode_blob.bin-file = $(obj)/microcode_blob.bin -microcode_blob.bin-type = 0x53 -endif +################################################################################ +
-####################################################################### +################################################################################ # Build the final rom image COREBOOT_ROM_DEPENDENCIES:= ifeq ($(CONFIG_PAYLOAD_ELF),y) @@ -123,7 +122,7 @@ cbfs-files-$(CONFIG_BOOTSPLASH) += bootsplash.jpg bootsplash.jpg-file := $(call strip_quotes,$(CONFIG_BOOTSPLASH_FILE)) bootsplash.jpg-type := bootsplash
-####################################################################### +################################################################################ # i386 specific tools NVRAMTOOL:=$(objutil)/nvramtool/nvramtool
@@ -135,7 +134,7 @@ $(obj)/cmos_layout.bin: $(NVRAMTOOL) $(top)/src/mainboard/$(MAINBOARDDIR)/cmos.l @printf " OPTION $(subst $(obj)/,,$(@))\n" $(NVRAMTOOL) -y $(top)/src/mainboard/$(MAINBOARDDIR)/cmos.layout -L $@
-####################################################################### +################################################################################ # Common recipes for all stages
$(objcbfs)/%.bin: $(objcbfs)/%.elf @@ -150,7 +149,7 @@ $(objcbfs)/%.elf: $(objcbfs)/%.debug $(OBJCOPY) --add-gnu-debuglink=$< $@.tmp mv $@.tmp $@
-####################################################################### +################################################################################ # Build the coreboot_ram (stage 2)
$(objcbfs)/coreboot_ram.debug: $(objgenerated)/coreboot_ram.o $(src)/arch/x86/coreboot_ram.ld @@ -174,7 +173,7 @@ $(objgenerated)/ramstage.a: $$(ramstage-objs) rm -f $@ $(AR) cr $@ $^
-####################################################################### +################################################################################ # Ramstage for AP CPU (AMD K8, obsolete?)
$(objcbfs)/coreboot_ap.debug: $(objgenerated)/coreboot_ap.o $(src)/arch/x86/init/ldscript_apc.lb @@ -185,7 +184,7 @@ $(objgenerated)/coreboot_ap.o: $(src)/mainboard/$(MAINBOARDDIR)/ap_romstage.c $( @printf " CC $(subst $(obj)/,,$(@))\n" $(CC) -MMD $(CFLAGS) -I$(src) -D__PRE_RAM__ -I. -I$(obj) -c $< -o $@
-####################################################################### +################################################################################ # done
crt0s = $(src)/arch/x86/init/prologue.inc @@ -264,7 +263,7 @@ ifeq ($(CONFIG_HAVE_BUS_CONFIG),y) ramstage-srcs += src/mainboard/$(MAINBOARDDIR)/get_bus_conf.c endif
-####################################################################### +################################################################################ # Build the final rom image
$(obj)/coreboot.pre: $(objcbfs)/romstage_xip.elf $(obj)/coreboot.pre1 $(CBFSTOOL) @@ -274,7 +273,7 @@ $(obj)/coreboot.pre: $(objcbfs)/romstage_xip.elf $(obj)/coreboot.pre1 $(CBFSTOOL $(CONFIG_CBFS_PREFIX)/romstage x $(shell cat $(objcbfs)/base_xip.txt) mv $@.tmp $@
-####################################################################### +################################################################################ # Build the bootblock
bootblock_lds = $(src)/arch/x86/init/ldscript_failover.lb @@ -331,7 +330,7 @@ else $(CC) -nostdlib -nostartfiles -static -o $@ -L$(obj) -T $(objgenerated)/bootblock.ld $< endif
-####################################################################### +################################################################################ # Build the romstage
$(objcbfs)/romstage_null.debug: $$(romstage-objs) $(objgenerated)/romstage_null.ld diff --git a/src/cpu/Kconfig b/src/cpu/Kconfig index baf686e..daf8083 100644 --- a/src/cpu/Kconfig +++ b/src/cpu/Kconfig @@ -62,10 +62,90 @@ config SSE2 streaming SIMD instructions. Some parts of coreboot can be built with more efficient code if SSE2 instructions are available.
-config MICROCODE_IN_CBFS - bool "Look for microcode in CBFS" +endif # ARCH_X86 + +config CPU_MICROCODE_IN_CBFS + bool default n + +choice + prompt "Include CPU microcode in CBFS" + default CPU_MICROCODE_CBFS_GENERATE + depends on CPU_MICROCODE_IN_CBFS + +config CPU_MICROCODE_CBFS_GENERATE + bool "Generate from tree" help - Load microcode updates from CBFS instead of compiling them in. + Select this option if you want microcode updates to be assembled when + building coreboot and included in the final image as a separate CBFS + file. Microcode will not be hard-coded into ramstage.
-endif # ARCH_X86 + The microcode file and may be removed from the ROM image at a later + time with cbfstool, if desired. + + If unsure, select this option. + +config CPU_MICROCODE_CBFS_EXTERNAL + bool "Include external microcode file" + help + Select this option if you want to include an external file containing + the CPU microcode. This will be included as a separate file in CBFS. + A word of caution: only select this option if you are sure the + microcode that you have is newer than the microcode shipping with + coreboot. + + The microcode file and may be removed from the ROM image at a later + time with cbfstool, if desired. + + If unsure, select "Generate from tree" + +config CPU_MICROCODE_FILE + string "Path and filename of CPU microcode" + depends on CPU_MICROCODE_CBFS_EXTERNAL + default "cpu_microcode.bin" + help + The path and filename of the file containing the CPU microcode. + +config CPU_MICROCODE_CBFS_NONE + bool "Do not include microcode updates" + help + Select this option if you do not want CPU microcode included in CBFS. + Note that for some CPUs, the microcode is hard-coded into the source + tree and is not loaded from CBFS. In this case, microcode will still + be updated. There is a push to move all microcode to CBFS, but this + change is not implemented for all CPUs. + + This option currently applies to: + - Intel SandyBridge/IvyBridge + - VIA Nano + + Microcode may be added to the ROM image at a later time with cbfstool, + if desired. + + If unsure, select "Generate from tree" + + The GOOD: + Microcode updates intend to solve issues that have been discovered + after CPU production. The expected effect is that systems work as + intended with the updated microcode, but we have also seen cases where + issues were solved by not applying microcode updates. + + The BAD: + Note that some operating system include these same microcode patches, + so you may need to also disable microcode updates in your operating + system for this option to have an effect. + + The UGLY: + A word of CAUTION: some CPUs depend on microcode updates to function + correctly. Not updating the microcode may leave the CPU operating at + less than optimal performance, or may cause outright hangups. + There are CPUs where coreboot cannot properly initialize the CPU + without microcode updates + For example, if running with the factory microcode, some Intel + SandyBridge CPUs may hang when enabling CAR, or some VIA Nano CPUs + will hang when changing the frequency. + + Make sure you have a way of flashing the ROM externally before + selecting this option. + +endchoice diff --git a/src/cpu/Makefile.inc b/src/cpu/Makefile.inc index 57273cf..572b707 100644 --- a/src/cpu/Makefile.inc +++ b/src/cpu/Makefile.inc @@ -1,3 +1,28 @@ +################################################################################ +## Subdirectories +################################################################################ subdirs-y += amd subdirs-y += intel subdirs-y += via + + +################################################################################ +## Rules for building the microcode blob in CBFS +################################################################################ + +ifeq ($(CONFIG_CPU_MICROCODE_CBFS_EXTERNAL), y) +cbfs-files-y += cpu_microcode_blob.bin +microcode_blob.bin-file = $(CONFIG_CPU_MICROCODE_FILE) +microcode_blob.bin-type = 0x53 +endif + +ifneq ($(CONFIG_CPU_MICROCODE_CBFS_NONE), y) +cbfs-files-y += cpu_microcode_blob.bin +cpu_microcode_blob.bin-file = $(obj)/cpu_microcode_blob.bin +cpu_microcode_blob.bin-type = 0x53 + +$(obj)/cpu_microcode_blob.bin: $$(cpu_microcode-objs) + @printf " ASSM $(subst $(obj)/,,$(@))\n" + $(CC) -MMD -o $@ -L$(obj) $(cpu_microcode-objs) + +endif diff --git a/src/cpu/intel/microcode/Makefile.inc b/src/cpu/intel/microcode/Makefile.inc index f4d0102..22655c9 100644 --- a/src/cpu/intel/microcode/Makefile.inc +++ b/src/cpu/intel/microcode/Makefile.inc @@ -1,15 +1,5 @@ -ramstage-y += microcode.c - - -ifeq ($(CONFIG_MICROCODE_IN_CBFS),y) - -SRC_PATH = src/cpu/intel/microcode -FLAGS = -I $(CONFIG_MICROCODE_INCLUDE_PATH) -include $(obj)/config.h -$(obj)/microcode_blob.o: $(SRC_PATH)/microcode_blob.c - $(CC) $(FLAGS) -MMD -c -o $@ $< - -$(obj)/microcode_blob.bin: $(obj)/microcode_blob.o - objcopy -j .data -O binary $< $@ - --include $(obj)/microcode_blob.d -endif +################################################################################ +## One small file with the awesome super-power of updating the cpu microcode +## directly from CBFS. You have been WARNED!!! +################################################################################ +ramstage-y += microcode.c \ No newline at end of file diff --git a/src/cpu/intel/microcode/microcode.c b/src/cpu/intel/microcode/microcode.c index e84bad9..a4471ca 100644 --- a/src/cpu/intel/microcode/microcode.c +++ b/src/cpu/intel/microcode/microcode.c @@ -28,7 +28,7 @@ #include <cpu/x86/msr.h> #include <cpu/intel/microcode.h>
-#if CONFIG_MICROCODE_IN_CBFS +#if CONFIG_CPU_MICROCODE_IN_CBFS #ifdef __PRE_RAM__ #include <arch/cbfs.h> #else @@ -77,7 +77,7 @@ static inline u32 read_microcode_rev(void) return msr.hi; }
-#if CONFIG_MICROCODE_IN_CBFS +#if CONFIG_CPU_MICROCODE_IN_CBFS static #endif void intel_update_microcode(const void *microcode_updates) @@ -144,9 +144,9 @@ void intel_update_microcode(const void *microcode_updates) } }
-#if CONFIG_MICROCODE_IN_CBFS +#if CONFIG_CPU_MICROCODE_IN_CBFS
-#define MICROCODE_CBFS_FILE "microcode_blob.bin" +#define MICROCODE_CBFS_FILE "cpu_microcode_blob.bin"
void intel_update_microcode_from_cbfs(void) { diff --git a/src/cpu/intel/microcode/microcode_blob.c b/src/cpu/intel/microcode/microcode_blob.c deleted file mode 100644 index 69238a9..0000000 --- a/src/cpu/intel/microcode/microcode_blob.c +++ /dev/null @@ -1,22 +0,0 @@ -/* - * This file is part of the coreboot project. - * - * Copyright (C) 2012 The ChromiumOS Authors. All rights reserved. - * - * 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. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - */ - -unsigned microcode[] = { -#include <microcode_blob.h> -}; diff --git a/src/cpu/intel/model_206ax/Kconfig b/src/cpu/intel/model_206ax/Kconfig index 071683e..1b4351e 100644 --- a/src/cpu/intel/model_206ax/Kconfig +++ b/src/cpu/intel/model_206ax/Kconfig @@ -12,7 +12,7 @@ config CPU_SPECIFIC_OPTIONS select SSE2 select UDELAY_LAPIC select SMM_TSEG - select MICROCODE_IN_CBFS + select CPU_MICROCODE_IN_CBFS
config BOOTBLOCK_CPU_INIT string @@ -22,9 +22,6 @@ config SMM_TSEG_SIZE hex default 0x800000
-config MICROCODE_INCLUDE_PATH - string - default "src/cpu/intel/model_206ax" endif
if CPU_INTEL_MODEL_206AX diff --git a/src/cpu/intel/model_206ax/Makefile.inc b/src/cpu/intel/model_206ax/Makefile.inc index e9b8e6d..990a7fa 100644 --- a/src/cpu/intel/model_206ax/Makefile.inc +++ b/src/cpu/intel/model_206ax/Makefile.inc @@ -5,4 +5,6 @@ ramstage-$(CONFIG_GENERATE_ACPI_TABLES) += acpi.c
smm-$(CONFIG_HAVE_SMI_HANDLER) += finalize.c
+cpu_microcode-y += microcode_blob.c + cpu_incs += $(src)/cpu/intel/model_206ax/cache_as_ram.inc diff --git a/src/cpu/intel/model_206ax/microcode_blob.c b/src/cpu/intel/model_206ax/microcode_blob.c new file mode 100644 index 0000000..c2538e8 --- /dev/null +++ b/src/cpu/intel/model_206ax/microcode_blob.c @@ -0,0 +1,22 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2012 The ChromiumOS Authors. All rights reserved. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +unsigned microcode[] = { +#include "microcode_blob.h" +}; diff --git a/src/include/cpu/intel/microcode.h b/src/include/cpu/intel/microcode.h index 289e919..e9c13f9 100644 --- a/src/include/cpu/intel/microcode.h +++ b/src/include/cpu/intel/microcode.h @@ -21,7 +21,7 @@ #define __CPU__INTEL__MICROCODE__
#ifndef __PRE_RAM__ -#if CONFIG_MICROCODE_IN_CBFS +#if CONFIG_CPU_MICROCODE_IN_CBFS void intel_update_microcode_from_cbfs(void); #else void intel_update_microcode(const void *microcode_updates);