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Add support to run SMM handler in TSEG instead of ASEG

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Traditionally coreboot's SMM handler runs in ASEG (0xa0000),
"behind" the graphics memory. This approach has two issues:
- It limits the possible size of the SMM handler (and the
  number of CPUs supported in a system)
- It's not considered a supported path anymore in newer CPUs.

Change-Id: I9f2877e46873ab2ea8f1157ead4bc644a50be19e
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Acked-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/842
Reviewed-by: Peter Stuge <peter@stuge.se>
Tested-by: build bot (Jenkins)
This commit is contained in:
Stefan Reinauer
2012-04-02 13:24:04 -07:00
committed by Peter Stuge
parent 6efbebdb58
commit 3aa067f595
8 changed files with 440 additions and 3 deletions
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14
src/cpu/x86/smm/Makefile.inc
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@@ -22,15 +22,25 @@ ifeq ($(CONFIG_HAVE_SMI_HANDLER),y)
ramstage-srcs += $(obj)/cpu/x86/smm/smm_wrap
endif
# Use TSEG specific entry point and linker script
ifeq ($(CONFIG_SMM_TSEG),y)
smm-y += smmhandler_tseg.S
SMM_LDFLAGS := $(LDFLAGS) -pie
SMM_LDSCRIPT := smm_tseg.ld
else
smm-y += smmhandler.S
SMM_LDFLAGS := $(LDFLAGFS)
SMM_LDSCRIPT := smm.ld
endif
smm-y += smihandler.c
smm-y += smiutil.c
$(obj)/cpu/x86/smm/smm.o: $$(smm-objs)
$(CC) $(LDFLAGS) -nostdlib -r -o $@ $^
$(obj)/cpu/x86/smm/smm_wrap: $(obj)/cpu/x86/smm/smm.o $(src)/cpu/x86/smm/smm.ld $(obj)/ldoptions
$(CC) $(LDFLAGS) -nostdlib -nostartfiles -static -o $(obj)/cpu/x86/smm/smm.elf -T $(src)/cpu/x86/smm/smm.ld $(obj)/cpu/x86/smm/smm.o
$(obj)/cpu/x86/smm/smm_wrap: $(obj)/cpu/x86/smm/smm.o $(src)/cpu/x86/smm/$(SMM_LDSCRIPT) $(obj)/ldoptions
$(CC) $(SMM_LDFLAGS) -nostdlib -nostartfiles -static -o $(obj)/cpu/x86/smm/smm.elf -T $(src)/cpu/x86/smm/$(SMM_LDSCRIPT) $(obj)/cpu/x86/smm/smm.o
$(NM) -n $(obj)/cpu/x86/smm/smm.elf | sort > $(obj)/cpu/x86/smm/smm.map
$(OBJCOPY) -O binary $(obj)/cpu/x86/smm/smm.elf $(obj)/cpu/x86/smm/smm