rules.h: Add ENV_ macros to detect current architecture

This patch expands the existing ENV_<stage> macros in <rules.h> with a
set of ENV_<arch> macros which can be used to detect which architecture
the current compilation unit is built for. These are more consistent
than compiler-defined macros (like '#ifdef __arm__') and will make it
easier to write small, architecture-dependent differences in common code
(where we currently often use IS_ENABLED(CONFIG_ARCH_...), which is
technically incorrect in a world where every stage can run on a
different architecture, and merely kinda happened to work out for now).

Also remove a vestigal <arch/rules.h> from ARM64 which was no longer
used, and genericise ARM subarchitecture Makefiles a little to make
things like __COREBOOT_ARM_ARCH__ available from all file types
(including .ld).

BUG=None
TEST=Compiled Falco, Blaze, Jerry and Smaug.

Change-Id: Id51aeb290b5c215c653e42a51919d0838e28621f
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: http://review.coreboot.org/12433
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>

2 files changed, 7 insertions, 46 deletions

diff --git a/src/arch/arm64/armv8/Makefile.inc b/src/arch/arm64/armv8/Makefile.inc
index f25a567b29..53d0e46d37 100644
--- a/src/arch/arm64/armv8/Makefile.inc
+++ b/src/arch/arm64/armv8/Makefile.inc
@@ -19,8 +19,6 @@ subdirs-y += lib/
 
 armv8_flags = -march=armv8-a -I$(src)/arch/arm64/include/armv8/ -D__COREBOOT_ARM_ARCH__=8
 
-armv8_asm_flags = $(armv8_flags)
-
 ################################################################################
 ## bootblock
 ################################################################################
@@ -34,8 +32,7 @@ bootblock-y += cache_helpers.S
 bootblock-y += cpu.S
 bootblock-$(CONFIG_BOOTBLOCK_CONSOLE) += exception.c
 
-bootblock-c-ccopts += $(armv8_flags)
-bootblock-S-ccopts += $(armv8_asm_flags)
+bootblock-generic-ccopts += $(armv8_flags)
 
 # Required to access unaligned timestamp struct members before MMU is active
 # (TODO: Maybe use explicit unaligned accesses in timestamp code instead, or
@@ -54,10 +51,8 @@ verstage-y += cpu.S
 verstage-y += cache_helpers.S
 verstage-y += exception.c
 
-libverstage-c-ccopts += $(armv8_flags)
-libverstage-S-ccopts += $(armv8_asm_flags)
-verstage-c-ccopts += $(armv8_flags)
-verstage-S-ccopts += $(armv8_asm_flags)
+libverstage-generic-ccopts += $(armv8_flags)
+verstage-generic-ccopts += $(armv8_flags)
 
 endif
 
@@ -71,11 +66,9 @@ romstage-y += cache_helpers.S
 romstage-y += cpu.S
 romstage-y += exception.c
 
-romstage-c-ccopts += $(armv8_flags)
-romstage-S-ccopts += $(armv8_asm_flags)
+romstage-generic-ccopts += $(armv8_flags)
 
-rmodules_arm64-c-ccopts += $(armv8_flags)
-rmodules_arm64-S-ccopts += $(armv8_asm_flags)
+rmodules_arm64-generic-ccopts += $(armv8_flags)
 
 endif
 
@@ -90,10 +83,8 @@ ramstage-y += cpu.S
 ramstage-y += exception.c
 ramstage-y += mmu.c
 
-ramstage-c-ccopts += $(armv8_flags)
-ramstage-S-ccopts += $(armv8_asm_flags)
+ramstage-generic-ccopts += $(armv8_flags)
 
-rmodules_arm64-c-ccopts += $(armv8_flags)
-rmodules_arm64-S-ccopts += $(armv8_asm_flags)
+rmodules_arm64-generic-ccopts += $(armv8_flags)
 
 endif
diff --git a/src/arch/arm64/include/armv8/arch/rules.h b/src/arch/arm64/include/armv8/arch/rules.h
deleted file mode 100644
index a252894345..0000000000
--- a/src/arch/arm64/include/armv8/arch/rules.h
+++ /dev/null
@@ -1,30 +0,0 @@
-/*
- * This file is part of the coreboot project.
- *
- *
- * 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.
- */
-
-#ifndef _ARCH_RULES_H
-#define _ARCH_RULES_H
-
-/* For romstage and ramstage always build with simple device model, ie.
- * PCI, PNP and CPU functions operate without use of devicetree.
- *
- * For ramstage individual source file may define __SIMPLE_DEVICE__
- * before including any header files to force that particular source
- * be built with simple device model.
- */
-
-#if defined(__PRE_RAM__)
-#define __SIMPLE_DEVICE__
-#endif
-
-#endif /* _ARCH_RULES_H */