From e581b067ca968ce4dae818d8bf09081c1eb6e11a Mon Sep 17 00:00:00 2001 From: Aaron Durbin Date: Thu, 3 Sep 2015 11:29:28 -0500 Subject: x86: add romstage.S to bind program flow and ordering The build system was previously determining the flow of the romstage code by the order of files added to the crt0s make variable. Those files were then concatenated together, and the resulting file was added to the build dependencies for romstage proper. Now romstage.S is added that can be built using the default object file rules. The generated romstage.inc is pulled in by way of an #include in the newly added romstage.S. BUG=chrome-os-partner:44827 BRANCH=None TEST=Built vortex, rambi, and some asus boards. compared readelf -e output. Change-Id: Ib1168f9541eaf96651c52d03dc0f60e2489a77bd Signed-off-by: Aaron Durbin Reviewed-on: http://review.coreboot.org/11504 Tested-by: build bot (Jenkins) Reviewed-by: Alexandru Gagniuc Reviewed-by: Stefan Reinauer Reviewed-by: Patrick Georgi --- src/arch/x86/Makefile.inc | 26 +++++++++++++------------- src/arch/x86/romstage.S | 37 +++++++++++++++++++++++++++++++++++++ 2 files changed, 50 insertions(+), 13 deletions(-) create mode 100644 src/arch/x86/romstage.S diff --git a/src/arch/x86/Makefile.inc b/src/arch/x86/Makefile.inc index 00d8d27dc8..fe974efc85 100644 --- a/src/arch/x86/Makefile.inc +++ b/src/arch/x86/Makefile.inc @@ -113,17 +113,23 @@ endif # CONFIG_ARCH_BOOTBLOCK_X86_32 / CONFIG_ARCH_BOOTBLOCK_X86_64 ifeq ($(CONFIG_ARCH_ROMSTAGE_X86_32)$(CONFIG_ARCH_ROMSTAGE_X86_64),y) -crt0s = $(src)/arch/x86/prologue.inc romstage-srcs += $(src)/arch/x86/romstage.ld -crt0s += $(src)/cpu/x86/32bit/entry32.inc romstage-srcs += $(src)/cpu/x86/32bit/entry32.ld -crt0s += $(src)/cpu/x86/fpu_enable.inc -ifeq ($(CONFIG_SSE),y) -crt0s += $(src)/cpu/x86/sse_enable.inc -endif +# Chipset specific assembly stubs in the romstage program flow. Certain +# boards have more than one assembly stub so collect those and put them +# into a single generated file. +crt0s = $(cpu_incs-y) + +$(objgenerated)/romstage.inc: $$(crt0s) + @printf " GEN $(subst $(obj)/,,$(@))\n" + printf '$(foreach crt0,$(crt0s),#include "$(crt0)"\n)' > $@ -crt0s += $(cpu_incs-y) +# Add the assembly file that pulls in the rest of the dependencies in +# the right order. Make sure the auto generated romstage.inc is a proper +# dependency. +romstage-y += romstage.S +$(obj)/arch/x86/romstage.romstage.o: $(objgenerated)/romstage.inc ifneq ($(CONFIG_ROMCC),y) @@ -165,8 +171,6 @@ $(obj)/mainboard/$(MAINBOARDDIR)/romstage.inc: $(src)/mainboard/$(MAINBOARDDIR)/ endif -romstage-srcs += $(objgenerated)/crt0.S - romstage-libs ?= ifeq ($(CONFIG_ARCH_ROMSTAGE_X86_32),y) @@ -209,10 +213,6 @@ $(objcbfs)/base_xip.txt: $(obj)/coreboot.pre1 $(objcbfs)/romstage_null.bin || { echo "The romstage is larger than XIP size. Please expand the CONFIG_XIP_ROM_SIZE" ; exit 1; } mv $@.tmp $@ -$(objgenerated)/crt0.S: $$(crt0s) - @printf " GEN $(subst $(obj)/,,$(@))\n" - printf '$(foreach crt0,$(crt0s),#include "$(crt0)"\n)' > $@ - # Compiling crt0 with -g seems to trigger https://sourceware.org/bugzilla/show_bug.cgi?id=6428 romstage-S-ccopts += -I. -g0 diff --git a/src/arch/x86/romstage.S b/src/arch/x86/romstage.S new file mode 100644 index 0000000000..b19b954b95 --- /dev/null +++ b/src/arch/x86/romstage.S @@ -0,0 +1,37 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2015 Google Inc. + * + * 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. + */ + +/* This file assembles the start of the romstage program by the order of the + * includes. Thus, it's extremely important that one pays very careful + * attention to the order of the includes. */ + +#include +#include +#include +#if IS_ENABLED(CONFIG_SSE) +#include +#endif + +/* + * The romstage.inc is generated based on the requirements of the mainboard. + * For example, for ROMCC boards the MAINBOARDDIR/romstage.c would be + * processed by ROMCC and added. In non-ROMCC boards the chipsets' + * cache-as-ram setup files would be here. + */ +#include -- cgit v1.2.3