armv8: add support for armv8 cpu

This is an emulation cpu.

Lots of stuff missing, clearly, but I want to get the basic outline right.

BUG=None
TEST=breaks no builds
BRANCH=None

Change-Id: Ie9431afe1dbc4eb8e4b5b73da006a0603a221f3f
Signed-off-by: Ronald G. Minnich <rminnich@google.com>
Reviewed-on: https://chromium-review.googlesource.com/180385
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: Ronald Minnich <rminnich@chromium.org>

Makefile

@@ -113,6 +113,7 @@ else
 
 include $(HAVE_DOTCONFIG)
 
+ARCHDIR-$(CONFIG_ARCH_AARCH64)   := aarch64
 ARCHDIR-$(CONFIG_ARCH_ARM)   := arm
 ARCHDIR-$(CONFIG_ARCH_X86)     := x86
 

src/Kconfig

@@ -226,6 +226,10 @@ config ARCH_ARM
 	bool
 	default n
 
+config ARCH_AARCH64
+	bool
+	default n
+
 # Warning: The file is included whether or not the if is here.
 # but the if controls how the evaluation occurs.
 if ARCH_X86
@@ -236,6 +240,10 @@ if ARCH_ARM
 source src/arch/arm/Kconfig
 endif
 
+if ARCH_AARCH64
+source src/arch/aarch64/Kconfig
+endif
+
 config HAVE_ARCH_MEMSET
 	bool
 	default n

src/cpu/Kconfig

@@ -1,12 +1,9 @@
 # Warning: This file is included whether or not the if is here.
 # The if controls how the evaluation occurs.
 # (See also src/Kconfig)
-if ARCH_ARM
 
 source src/cpu/armltd/Kconfig
 
-endif	# ARCH_ARM
-
 if ARCH_X86
 
 source src/cpu/amd/Kconfig

src/cpu/armltd/Kconfig

@@ -1 +1,2 @@
 source src/cpu/armltd/cortex-a9/Kconfig
+source src/cpu/armltd/armv8/Kconfig

src/cpu/armltd/Makefile.inc

@@ -1 +1,2 @@
 subdirs-$(CONFIG_CPU_ARMLTD_CORTEX_A9) += cortex-a9
+subdirs-$(CONFIG_CPU_ARMLTD_CORTEX_A9) += armv8

src/cpu/armltd/armv8/Kconfig

@@ -0,0 +1,15 @@
+config CPU_ARMLTD_ARMV8
+	depends on ARCH_AARCH64
+	bool
+	select EARLY_CONSOLE
+	default n
+
+if CPU_ARMLTD_ARMV8
+
+config BOOTBLOCK_CPU_INIT
+	string
+	default "cpu/armltd/armv8/bootblock.c"
+	help
+	  CPU/SoC-specific bootblock code.
+endif
+

src/cpu/armltd/armv8/Makefile.inc

@@ -0,0 +1,3 @@
+ramstage-y += cache.c
+romstage-y += cache.c
+bootblock-y += cache.c

src/cpu/armltd/armv8/bootblock.c

@@ -0,0 +1,17 @@
+/*
+ * Copyright (C) 2013 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+void bootblock_cpu_init(void);
+void bootblock_cpu_init(void)
+{
+}

src/cpu/armltd/armv8/cache.c

@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2013 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#include <aarch64.h>
+
+/*
+ * Sets L2 cache related parameters before enabling data cache
+ */
+void v8_outer_cache_enable(void)
+{
+}
+
+/* stubs so we don't need weak symbols in cache_v8.c */
+void v8_outer_cache_disable(void)
+{
+}
+
+void v8_outer_cache_flush_all(void)
+{
+}
+
+void v8_outer_cache_inval_all(void)
+{
+}
+
+void v8_outer_cache_flush_range(u32 start, u32 end)
+{
+}
+
+void v8_outer_cache_inval_range(u32 start, u32 end)
+{
+}