New patch to review for coreboot: acpi: bring back ability to link DSDT into ramstage

[Patrick Georgi]

Patrick Georgi ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/10637

-gerrit

commit 76d63478c1c0bf7d73767c7cb637c5256eb88649
Author: Patrick Georgi 
Date:   Mon Jun 22 21:10:34 2015 +0200

acpi: bring back ability to link DSDT into ramstage

Bring back the ability to link in the DSDT. This is to help Chrome OS to
    switch over to a new upstream quickly (because some of the custom built
    mechanisms are a pain with tons of files).

This is supposed to be temporary (famous last words), but I'd rather fix the
    lack of CBFS awareness in CrOS bit for good in the time I usually spend on
    keeping upstream and CrOS branches close.

Change-Id: I7fa5540bbf5c568c4adca56a09c83b6c7e358ad5
    Signed-off-by: Patrick Georgi 
---
 src/arch/x86/Kconfig      |  4 ++++
 src/arch/x86/Makefile.inc | 17 +++++++++++++++++
 src/arch/x86/boot/acpi.c  |  7 +++++++
 3 files changed, 28 insertions(+)

diff --git a/src/arch/x86/Kconfig b/src/arch/x86/Kconfig
index 1e35846..88b2592 100644
--- a/src/arch/x86/Kconfig
+++ b/src/arch/x86/Kconfig
@@ -134,3 +134,7 @@ config HPET_ADDRESS
 config ID_SECTION_OFFSET
    hex
    default 0x80
+
+config COMPILE_IN_DSDT
+	bool "compile in DSDT and use that over DSDT in CBFS"
+	default n
diff --git a/src/arch/x86/Makefile.inc b/src/arch/x86/Makefile.inc
index 4c00162..68c5ac4 100644
--- a/src/arch/x86/Makefile.inc
+++ b/src/arch/x86/Makefile.inc
@@ -245,6 +245,23 @@ endif # CONFIG_ARCH_ROMSTAGE_X86_32 / CONFIG_ARCH_ROMSTAGE_X86_64

ifeq ($(CONFIG_ARCH_RAMSTAGE_X86_32)$(CONFIG_ARCH_RAMSTAGE_X86_64),y)

+ifeq ($(CONFIG_COMPILE_IN_DSDT),y)
+ramstage-srcs += $(obj)/dsdt.aml
+
+ifeq ($(CONFIG_ARCH_RAMSTAGE_X86_32),y)
+target-objcopy=-O elf32-i386 -B i386
+endif
+ifeq ($(CONFIG_ARCH_RAMSTAGE_X86_64),y)
+target-objcopy=-O elf64-x86_64 -B x86_64
+endif
+
+define ramstage-objs_aml_template
+$(call src-to-obj,ramstage,$(1).aml): $(1).aml
+	@printf "    OBJCOPY    $$(subst $$(obj)/,,$$(@))\n"
+	cd $$(dir $$@) && $$(OBJCOPY_ramstage) -I binary $$(target-objcopy) $$(notdir $$<) $$(notdir $$@)
+endef
+endif
+
 ramstage-srcs += $(wildcard src/mainboard/$(MAINBOARDDIR)/mainboard.c)
 ifeq ($(CONFIG_GENERATE_MP_TABLE),y)
 ifneq ($(wildcard src/mainboard/$(MAINBOARDDIR)/mptable.c),)
diff --git a/src/arch/x86/boot/acpi.c b/src/arch/x86/boot/acpi.c
index 208411e..cf33e40 100644
--- a/src/arch/x86/boot/acpi.c
+++ b/src/arch/x86/boot/acpi.c
@@ -757,9 +757,16 @@ unsigned long write_acpi_tables(unsigned long start)
    if (fw)
    	return fw;

+#if CONFIG_COMPILE_IN_DSDT
+	extern char _binary_dsdt_aml_start;
+	extern char _binary_dsdt_aml_end;
+	dsdt_file = (acpi_header_t *)&_binary_dsdt_aml_start;
+	dsdt_size = (size_t)(&_binary_dsdt_aml_end - &_binary_dsdt_aml_start);
+#else
    dsdt_file = cbfs_boot_map_with_leak(
    			     CONFIG_CBFS_PREFIX "/dsdt.aml",
    			     CBFS_TYPE_RAW, &dsdt_size);
+#endif
    if (!dsdt_file) {
    	printk(BIOS_ERR, "No DSDT file, skipping ACPI tables\n");
    	return current;