rmodules: use rmodtool to create rmodules

Start using the rmodtool for generating rmodules.
rmodule_link() has been changed to create 2 rules:
one for the passed in <name>, the other for creating
<name>.rmod which is an ELF file in the format of
an rmodule.

Since the header is not compiled and linked together
with an rmodule there needs to be a way of marking
which symbol is the entry point. __rmodule_entry is
the symbol used for knowing the entry point. There
was a little churn in SMM modules to ensure an
rmodule entry point symbol takes a single argument.

Change-Id: Ie452ed866f6596bf13f137f5b832faa39f48d26e
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/5379
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)

src/arch/x86/Makefile.inc

@@ -93,7 +93,13 @@ ifneq ($(strip $(call strip_quotes,$(CONFIG_LINUX_INITRD))),)
 endif
 endif
 
-$(obj)/coreboot.rom: $(obj)/coreboot.pre $(objcbfs)/coreboot_ram.elf $(CBFSTOOL) $(call strip_quotes,$(COREBOOT_ROM_DEPENDENCIES)) $$(INTERMEDIATE) $$(VBOOT_STUB_ELF)
+ifeq ($(CONFIG_HAVE_REFCODE_BLOB),y)
+REFCODE_BLOB=$(obj)/refcode.rmod
+$(REFCODE_BLOB): $(RMODTOOL)
+	$(RMODTOOL) -i $(CONFIG_REFCODE_BLOB_FILE) -o $@
+endif
+
+$(obj)/coreboot.rom: $(obj)/coreboot.pre $(objcbfs)/coreboot_ram.elf $(CBFSTOOL) $(call strip_quotes,$(COREBOOT_ROM_DEPENDENCIES)) $$(INTERMEDIATE) $$(VBOOT_STUB) $(REFCODE_BLOB)
 	@printf "    CBFS       $(subst $(obj)/,,$(@))\n"
 	cp $(obj)/coreboot.pre $@.tmp
 	$(CBFSTOOL) $@.tmp add-stage -f $(objcbfs)/coreboot_ram.elf -n $(CONFIG_CBFS_PREFIX)/coreboot_ram -c $(CBFS_COMPRESS_FLAG)
@@ -140,7 +146,7 @@ ifeq ($(CONFIG_INCLUDE_CONFIG_FILE),y)
 	$(CBFSTOOL) $@.tmp add -f $(obj)/config.tmp -n config -t raw; rm -f $(obj)/config.tmp ; fi
 endif
 ifeq ($(CONFIG_VBOOT_VERIFY_FIRMWARE),y)
-	$(CBFSTOOL) $@.tmp add-stage -f $(VBOOT_STUB_ELF) -n $(CONFIG_CBFS_PREFIX)/vboot -c $(CBFS_COMPRESS_FLAG)
+	$(CBFSTOOL) $@.tmp add-stage -f $(VBOOT_STUB) -n $(CONFIG_CBFS_PREFIX)/vboot -c $(CBFS_COMPRESS_FLAG)
 endif
 ifeq ($(CONFIG_HAVE_REFCODE_BLOB),y)
 	$(CBFSTOOL) $@.tmp add-stage -f $(CONFIG_REFCODE_BLOB_FILE) -n $(CONFIG_CBFS_PREFIX)/refcode -c $(CBFS_COMPRESS_FLAG)
@@ -205,6 +211,10 @@ ifeq ($(CONFIG_RELOCATABLE_RAMSTAGE),y)
 
 $(eval $(call rmodule_link,$(objcbfs)/coreboot_ram.debug, $(objgenerated)/coreboot_ram.o, $(CONFIG_HEAP_SIZE)))
 
+# The rmodule_link defintion creates an elf file with .rmod extension.
+$(objcbfs)/coreboot_ram.elf: $(objcbfs)/coreboot_ram.debug.rmod
+	cp $< $@
+
 else
 
 $(objcbfs)/coreboot_ram.debug: $(objgenerated)/coreboot_ram.o $(src)/arch/x86/coreboot_ram.ld

src/arch/x86/boot/Makefile.inc

@@ -11,7 +11,6 @@ ramstage-$(CONFIG_GENERATE_ACPI_TABLES) += acpi.c
 ramstage-$(CONFIG_GENERATE_SMBIOS_TABLES) += smbios.c
 ramstage-$(CONFIG_GENERATE_ACPI_TABLES) += acpigen.c
 ramstage-$(CONFIG_HAVE_ACPI_RESUME) += wakeup.S
-ramstage-$(CONFIG_RELOCATABLE_RAMSTAGE) += ramstage_module_header.c
 
 $(obj)/arch/x86/boot/smbios.ramstage.o: $(obj)/build.h
 

src/arch/x86/boot/ramstage_module_header.c

@@ -1,24 +0,0 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright (C) 2013 ChromeOS Authors
- *
- * 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
- */
-
-#include <rmodule.h>
-
-extern char _start[];
-
-DEFINE_RMODULE_HEADER(ramstage_module, _start, RMODULE_TYPE_STAGE);

src/arch/x86/lib/c_start.S

@@ -19,6 +19,8 @@ thread_stacks:
 	.section ".textfirst", "ax", @progbits
 	.code32
 	.globl _start
+	.globl __rmodule_entry
+__rmodule_entry:
 _start:
 	cli
 	lgdt	%cs:gdtaddr