buildsystem: Make CPU microcode updating more configurable
This patch aims to improve the microcode in CBFS handling that was
brought by the last patches from Stefan and the Chromium team.
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.
MICROCODE_INCLUDE_PATH Kconfig variable is eliminated. Microcode
is handled by a special class, cpu_microcode, as such:
cpu_microcode-y += microcode_file.c
MICROCODE_IN_CBFS should, in the future, be eliminated. Right now it is
needed by intel microcode updating. Once all intel cpus are converted to
cbfs updating, this variable can go away.
These files are then 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) Gives user more control over if and how to include microcode blobs
3) 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.
Change-Id: I38d0c9851691aa112e93031860e94895857ebb76
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-on: http://review.coreboot.org/1245
Tested-by: build bot (Jenkins)
Reviewed-by: Anton Kochkov <anton.kochkov@gmail.com>
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
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 $(obj)/microcode_blob.d
-endif
+################################################################################
+## One small file with the awesome super-power of updating the cpu microcode
+## directly from CBFS. You have been WARNED!!!
+################################################################################
+ramstage-y += microcode.c
\ No newline at end of file
diff --git a/src/cpu/intel/microcode/microcode.c b/src/cpu/intel/microcode/microcode.c
index e84bad9..a4471ca 100644
--- a/src/cpu/intel/microcode/microcode.c
+++ b/src/cpu/intel/microcode/microcode.c
@@ -28,7 +28,7 @@
#include <cpu/x86/msr.h>
#include <cpu/intel/microcode.h>
-#if CONFIG_MICROCODE_IN_CBFS
+#if CONFIG_CPU_MICROCODE_IN_CBFS
#ifdef __PRE_RAM__
#include <arch/cbfs.h>
#else
@@ -77,7 +77,7 @@
return msr.hi;
}
-#if CONFIG_MICROCODE_IN_CBFS
+#if CONFIG_CPU_MICROCODE_IN_CBFS
static
#endif
void intel_update_microcode(const void *microcode_updates)
@@ -144,9 +144,9 @@
}
}
-#if CONFIG_MICROCODE_IN_CBFS
+#if CONFIG_CPU_MICROCODE_IN_CBFS
-#define MICROCODE_CBFS_FILE "microcode_blob.bin"
+#define MICROCODE_CBFS_FILE "cpu_microcode_blob.bin"
void intel_update_microcode_from_cbfs(void)
{
diff --git a/src/cpu/intel/model_206ax/Kconfig b/src/cpu/intel/model_206ax/Kconfig
index 6635868..5c543b8 100644
--- a/src/cpu/intel/model_206ax/Kconfig
+++ b/src/cpu/intel/model_206ax/Kconfig
@@ -12,7 +12,7 @@
select SSE2
select UDELAY_LAPIC
select SMM_TSEG
- select MICROCODE_IN_CBFS
+ select CPU_MICROCODE_IN_CBFS
#select AP_IN_SIPI_WAIT
select TSC_SYNC_MFENCE
diff --git a/src/cpu/intel/model_206ax/Makefile.inc b/src/cpu/intel/model_206ax/Makefile.inc
index e9b8e6d..6ab4840 100644
--- a/src/cpu/intel/model_206ax/Makefile.inc
+++ b/src/cpu/intel/model_206ax/Makefile.inc
@@ -5,4 +5,6 @@
smm-$(CONFIG_HAVE_SMI_HANDLER) += finalize.c
+cpu_microcode-$(CONFIG_CPU_MICROCODE_CBFS_GENERATE) += microcode_blob.c
+
cpu_incs += $(src)/cpu/intel/model_206ax/cache_as_ram.inc
diff --git a/src/cpu/intel/microcode/microcode_blob.c b/src/cpu/intel/model_206ax/microcode_blob.c
similarity index 96%
rename from src/cpu/intel/microcode/microcode_blob.c
rename to src/cpu/intel/model_206ax/microcode_blob.c
index 69238a9..c2538e8 100644
--- a/src/cpu/intel/microcode/microcode_blob.c
+++ b/src/cpu/intel/model_206ax/microcode_blob.c
@@ -18,5 +18,5 @@
*/
unsigned microcode[] = {
-#include <microcode_blob.h>
+#include "microcode_blob.h"
};