[RFC] arm: Add generic smc wrapper

Lars Persson
2015-10-01T12:04:07Z

This adds an smc wrapper according to the ARM standard for secure
monitor calling conventions (ARM DEN 0028A).

Signed-off-by: Lars Persson <larper@axis.com>
---
arch/arm/include/asm/smc-call.h | 12 ++++++++++++
arch/arm/kernel/Makefile | 2 ++
arch/arm/kernel/smc-call.S | 22 ++++++++++++++++++++++
3 files changed, 36 insertions(+)
create mode 100644 arch/arm/include/asm/smc-call.h
create mode 100644 arch/arm/kernel/smc-call.S

diff --git a/arch/arm/include/asm/smc-call.h b/arch/arm/include/asm/smc-call.h
new file mode 100644
index 0000000..88a83d4
--- /dev/null
+++ b/arch/arm/include/asm/smc-call.h
@@ -0,0 +1,12 @@
+/*
+ * Wrapper for secure monitor calls using the ARM SMC calling
+ * convention.
+ */
+#ifndef __ASM_SMC_CALL_H
+#define __ASM_SMC_CALL_H
+
+#include <linux/types.h>
+
+extern int invoke_smc(u32 function_id, u32 arg0, u32 arg1, u32 arg2);
+
+#endif
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index af9e59b..f09d2d6 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -92,4 +92,6 @@ obj-y += psci-call.o
obj-$(CONFIG_SMP) += psci_smp.o
endif

+obj-y += smc-call.o
+
extra-y := $(head-y) vmlinux.lds
diff --git a/arch/arm/kernel/smc-call.S b/arch/arm/kernel/smc-call.S
new file mode 100644
index 0000000..a07ebf9
--- /dev/null
+++ b/arch/arm/kernel/smc-call.S
@@ -0,0 +1,22 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ * Copied from: psci-call.S.
+ */
+
+#include <linux/linkage.h>
+
+#include <asm/opcodes-sec.h>
+
+/* int invoke_smc(u32 function_id, u32 arg0, u32 arg1, u32 arg2) */
+ENTRY(invoke_smc)
+ __SMC(0)
+ bx lr
+ENDPROC(invoke_smc)
--
2.1.4