x86: SMM Module Support

Add support for SMM modules by leveraging the RMODULE lib. This allows
for easier dynamic SMM handler placement. The SMM module support
consists of a common stub which puts the executing CPU into protected
mode and calls into a pre-defined handler. This stub can then be used
for SMM relocation as well as the real SMM handler. For the relocation
one can call back into coreboot ramstage code to perform relocation in
C code.

The handler is essentially a copy of smihandler.c, but it drops the TSEG
differences. It also doesn't rely on the SMM revision as the cpu code
should know what processor it is supported.

Ideally the CONFIG_SMM_TSEG option could be removed once the existing
users of that option transitioned away from tseg_relocate() and
smi_get_tseg_base().

The generic SMI callbacks are now not marked as weak in the
declaration so that there aren't unlinked references. The handler
has default implementations of the generic SMI callbacks which are
marked as weak. If an external compilation module has a strong symbol
the linker will use that instead of the link one.

Additionally, the parameters to the generic callbacks are dropped as
they don't seem to be used directly. The SMM runtime can provide the
necessary support if needed.

Change-Id: I1e2fed71a40b2eb03197697d29e9c4b246e3b25e
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/2693
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/src/cpu/x86/smm/Makefile.inc b/src/cpu/x86/smm/Makefile.inc
index 405cf891ad..ee4dbeaae0 100644
--- a/src/cpu/x86/smm/Makefile.inc
+++ b/src/cpu/x86/smm/Makefile.inc
@@ -17,6 +17,51 @@
 ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 ##
 
+ifeq ($(CONFIG_SMM_MODULES),y)
+
+smmstub-y += smm_stub.S
+smmstub-y += smm_module_header.c
+
+smm-y += smiutil.c
+smm-y += smm_module_header.c
+smm-y += smm_module_handler.c
+
+ramstage-y += smm_module_loader.c
+
+ramstage-srcs += $(obj)/cpu/x86/smm/smm
+ramstage-srcs += $(obj)/cpu/x86/smm/smmstub
+
+# SMM Stub Module. The stub is used as a trampoline for relocation and normal
+# SMM handling.
+$(obj)/cpu/x86/smm/smmstub.o: $$(smmstub-objs)
+	$(CC) $(LDFLAGS) -nostdlib -r -o $@ $^
+
+# Link the SMM stub module with a 0-byte heap.
+$(eval $(call rmodule_link,$(obj)/cpu/x86/smm/smmstub.elf, $(obj)/cpu/x86/smm/smmstub.o, 0))
+
+$(obj)/cpu/x86/smm/smmstub: $(obj)/cpu/x86/smm/smmstub.elf
+	$(OBJCOPY) -O binary $< $@
+
+$(obj)/cpu/x86/smm/smmstub.ramstage.o: $(obj)/cpu/x86/smm/smmstub
+	@printf "    OBJCOPY    $(subst $(obj)/,,$(@))\n"
+	cd $(dir $@); $(OBJCOPY) -I binary $(notdir $<) -O elf32-i386 -B i386 $(notdir $@)
+
+# C-based SMM handler.
+
+$(obj)/cpu/x86/smm/smm.o: $$(smm-objs)
+	$(CC) $(LDFLAGS) -nostdlib -r -o $@ $^
+
+$(eval $(call rmodule_link,$(obj)/cpu/x86/smm/smm.elf, $(obj)/cpu/x86/smm/smm.o, $(CONFIG_SMM_MODULE_HEAP_SIZE)))
+
+$(obj)/cpu/x86/smm/smm: $(obj)/cpu/x86/smm/smm.elf
+	$(OBJCOPY) -O binary $< $@
+
+$(obj)/cpu/x86/smm/smm.ramstage.o: $(obj)/cpu/x86/smm/smm
+	@printf "    OBJCOPY    $(subst $(obj)/,,$(@))\n"
+	cd $(dir $@); $(OBJCOPY) -I binary $(notdir $<) -O elf32-i386 -B i386 $(notdir $@)
+
+else # CONFIG_SMM_MODULES
+
 ramstage-$(CONFIG_HAVE_SMI_HANDLER) += smmrelocate.S
 ifeq ($(CONFIG_HAVE_SMI_HANDLER),y)
 ramstage-srcs += $(obj)/cpu/x86/smm/smm_wrap
@@ -50,3 +95,4 @@ $(obj)/cpu/x86/smm/smm_wrap.ramstage.o: $(obj)/cpu/x86/smm/smm_wrap
 	@printf "    OBJCOPY    $(subst $(obj)/,,$(@))\n"
 	cd $(obj)/cpu/x86/smm; $(OBJCOPY) -I binary smm -O elf32-i386 -B i386 smm_wrap.ramstage.o
 
+endif # CONFIG_SMM_MODULES