coreboot arm64: Add library for system access

Add support for library functions required to access different system registers:
1) PSTATE and special purpose registers
2) System control registers
3) Cache-related registers
4) TLB maintenance registers
5) Misc barrier related functions

BUG=None
BRANCH=None
TEST=Compiles successfully

Original-Change-Id: I8809ca2b67b8e560b34577cda1483ee009a1d71a
Original-Signed-off-by: Furquan Shaikh <furquan@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/203490
Original-Tested-by: Furquan Shaikh <furquan@chromium.org>
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-Commit-Queue: Furquan Shaikh <furquan@chromium.org>
(cherry picked from commit 5da840c5d1f3d8fdf8cc0d7c44772bf0cef03fbb)

armv8: GPL license armv8 lib

BUG=None
BRANCH=None
TEST=Compiles successfully.

Original-Change-Id: Ibe0f09ef6704ad808cc482ffec27a4db32d7f6fd
Original-Signed-off-by: Furquan Shaikh <furquan@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/250950
Original-Trybot-Ready: Furquan Shaikh <furquan@chromium.org>
Original-Tested-by: Furquan Shaikh <furquan@chromium.org>
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-Commit-Queue: Furquan Shaikh <furquan@chromium.org>
(cherry picked from commit bc115869bb0bcedbc284677ca5743b9ab40bfc7e)

Get the library and the GPL license in a single commit.

Signed-off-by: Marc Jones <marc.jones@se-eng.com>

Change-Id: I4753a6b0d13a6f7515243bfa8e749e250fdd749d
Reviewed-on: http://review.coreboot.org/8465
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

1 files changed, 75 insertions, 0 deletions

diff --git a/src/arch/arm64/armv8/lib/tlb.c b/src/arch/arm64/armv8/lib/tlb.c
new file mode 100644
index 0000000000..36d1e70a4a
--- /dev/null
+++ b/src/arch/arm64/armv8/lib/tlb.c
@@ -0,0 +1,75 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2014 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., 51 Franklin St, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ *
+ * tlb.c: System intructions for TLB maintenance.
+ * Reference: ARM Architecture Reference Manual, ARMv8-A edition
+ */
+
+#include <stdint.h>
+
+#include <arch/lib_helpers.h>
+
+/* TLBIALL */
+void tlbiall_el1(void)
+{
+	__asm__ __volatile__("tlbi alle1\n\t" : : : "memory");
+}
+
+void tlbiall_el2(void)
+{
+	__asm__ __volatile__("tlbi alle2\n\t" : : : "memory");
+}
+
+void tlbiall_el3(void)
+{
+	__asm__ __volatile__("tlbi alle3\n\t" : : : "memory");
+}
+
+void tlbiall_current(void)
+{
+	SWITCH_CASE_TLBI(tlbiall);
+}
+
+/* TLBIALLIS */
+void tlbiallis_el1(void)
+{
+	__asm__ __volatile__("tlbi alle1is\n\t" : : : "memory");
+}
+
+void tlbiallis_el2(void)
+{
+	__asm__ __volatile__("tlbi alle2is\n\t" : : : "memory");
+}
+
+void tlbiallis_el3(void)
+{
+	__asm__ __volatile__("tlbi alle3is\n\t" : : : "memory");
+}
+
+void tlbiallis_current(void)
+{
+	SWITCH_CASE_TLBI(tlbiallis);
+}
+
+/* TLBIVAA */
+void tlbivaa_el1(uint64_t va)
+{
+	__asm__ __volatile__("tlbi vaae1, %0\n\t" : : "r" (va) : "memory");
+}