build rules: Identify build stage with simple variables

Provide simple environment variables telling which stage of boot is
being built. Also move this to arch-agnostic location.

Change-Id: I8cbb5cf91f53e01c06e7d672b5be3f5c235f911d
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5410
Reviewed-by: Aaron Durbin <adurbin@google.com>
Tested-by: build bot (Jenkins)

src/arch/armv7/include/arch/rules.h

@@ -1,34 +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.
- *
- * 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
- */
-
-#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 */

src/arch/x86/Makefile.inc

@@ -368,9 +368,9 @@ endif
 bootblock_inc += $(objgenerated)/bootblock.inc
 bootblock_inc += $(src)/arch/x86/lib/walkcbfs.S
 
-bootblock_romccflags := -mcpu=i386 -O2 -D__PRE_RAM__
+bootblock_romccflags := -mcpu=i386 -O2 -D__PRE_RAM__ -D__BOOT_BLOCK__
 ifeq ($(CONFIG_SSE),y)
-bootblock_romccflags := -mcpu=k7 -msse -O2 -D__PRE_RAM__
+bootblock_romccflags := -mcpu=k7 -msse -O2 -D__PRE_RAM__ -D__BOOT_BLOCK__
 endif
 
 $(objgenerated)/bootblock.ld: $$(bootblock_lds) $(obj)/ldoptions

src/arch/x86/include/arch/cpu.h

@@ -2,7 +2,7 @@
 #define ARCH_CPU_H
 
 #include <stdint.h>
-#include <arch/rules.h>
+#include <rules.h>
 
 /*
  * EFLAGS bits

src/arch/x86/include/arch/io.h

@@ -2,7 +2,7 @@
 #define _ASM_IO_H
 
 #include <stdint.h>
-#include <arch/rules.h>
+#include <rules.h>
 
 /*
  * This file contains the definitions for the x86 IO instructions

src/include/device/device.h

@@ -3,7 +3,7 @@
 
 #include <stdint.h>
 #include <stddef.h>
-#include <arch/rules.h>
+#include <rules.h>
 #include <device/resource.h>
 #include <device/path.h>
 

src/include/device/pci.h

@@ -19,7 +19,7 @@
 
 #include <stdint.h>
 #include <stddef.h>
-#include <arch/rules.h>
+#include <rules.h>
 #include <arch/io.h>
 #include <device/pci_def.h>
 #include <device/resource.h>

src/include/device/pnp.h

@@ -2,7 +2,7 @@
 #define DEVICE_PNP_H
 
 #include <stdint.h>
-#include <arch/rules.h>
+#include <rules.h>
 #include <device/device.h>
 #include <device/pnp_def.h>
 

src/include/rules.h

@@ -16,8 +16,37 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#ifndef _ARCH_RULES_H
+#ifndef _RULES_H
-#define _ARCH_RULES_H
+#define _RULES_H
+
+/* Useful helpers to tell whether the code is executing in bootblock,
+ * romstage, ramstage or SMM.
+ */
+
+#if defined(__BOOT_BLOCK__)
+#define ENV_BOOTBLOCK 1
+#define ENV_ROMSTAGE 0
+#define ENV_RAMSTAGE 0
+#define ENV_SMM 0
+
+#elif defined(__PRE_RAM__)
+#define ENV_BOOTBLOCK 0
+#define ENV_ROMSTAGE 1
+#define ENV_RAMSTAGE 0
+#define ENV_SMM 0
+
+#elif defined(__SMM__)
+#define ENV_BOOTBLOCK 0
+#define ENV_ROMSTAGE 0
+#define ENV_RAMSTAGE 0
+#define ENV_SMM 1
+#else
+
+#define ENV_BOOTBLOCK 0
+#define ENV_ROMSTAGE 0
+#define ENV_RAMSTAGE 1
+#define ENV_SMM 0
+#endif
 
 /* For romstage and ramstage always build with simple device model, ie.
  * PCI, PNP and CPU functions operate without use of devicetree.
@@ -31,4 +60,4 @@
 #define __SIMPLE_DEVICE__
 #endif
 
-#endif /* _ARCH_RULES_H */
+#endif /* _RULES_H */