util: add smmstoretool for editing SMMSTORE

Offline SMMSTORE variable modification tool.  Can be used to
pre-configure ROM image or debug EFI state stored in a dump.

Change-Id: I6c1c06f1d0c39c13b5be76a3070f09b715aca6e0
Signed-off-by: Sergii Dmytruk <sergii.dmytruk@3mdeb.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79080
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michał Żygowski <michal.zygowski@3mdeb.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

util/smmstoretool/Makefile

@@ -0,0 +1,56 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+PRG  := smmstoretool
+TOP  ?= $(abspath ../..)
+ROOT := $(TOP)/src
+MDE  := $(ROOT)/vendorcode/intel/edk2/UDK2017/MdePkg/Include/
+
+CC      ?= $(CROSS_COMPILE)gcc
+HOSTCC  ?= $(CC)
+INSTALL ?= /usr/bin/env install
+PREFIX  ?= /usr/local
+
+HOSTCFLAGS ?= $(CFLAGS)
+HOSTCFLAGS += -Wall -Wextra -MMD -MP -O3
+HOSTCFLAGS += -I $(ROOT)/commonlib/bsd/include
+HOSTCFLAGS += -I $(ROOT)/vendorcode/intel/edk2/
+HOSTCFLAGS += -I $(MDE)
+
+HOSTLDFLAGS ?= $(LDFLAGS)
+
+MACHINE := $(shell uname -m)
+ifeq ($(MACHINE),x86_64)
+    HOSTCFLAGS += -I $(MDE)/X64
+else ifeq ($(patsubst i%86,Ia32,$(MACHINE)),Ia32)
+    HOSTCFLAGS += -I $(MDE)/Ia32
+else
+    $(error Unsupported machine: '$(MACHINE)')
+endif
+
+SRC := data.c fv.c guids.c main.c storage.c utils.c vs.c
+
+OBJ := $(SRC:.c=.o)
+DEP := $(SRC:.c=.o.d)
+
+.PHONY: all debug clean install
+
+all: $(PRG)
+
+debug: HOSTCFLAGS += -O0 -g
+debug: HOSTLDFLAGS += -g
+debug: all
+
+install: $(PRG)
+	$(INSTALL) -d $(DESTDIR)$(PREFIX)/bin/
+	$(INSTALL) $^ $(DESTDIR)$(PREFIX)/bin/
+
+clean:
+	-$(RM) $(PRG) $(OBJ) $(DEP)
+
+$(PRG): $(OBJ)
+	$(HOSTCC) -o $@ $^ $(HOSTLDFLAGS)
+
+%.o: %.c
+	$(HOSTCC) $(HOSTCFLAGS) -c -o $@ -MF $@.d $<
+
+-include $(DEP)