summaryrefslogtreecommitdiff
path: root/include/linux/arm-smccc.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/linux/arm-smccc.h')
-rw-r--r--include/linux/arm-smccc.h25
1 files changed, 23 insertions, 2 deletions
diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h
index 59494df0f55b..56d6a5c6e353 100644
--- a/include/linux/arm-smccc.h
+++ b/include/linux/arm-smccc.h
@@ -5,12 +5,15 @@
#ifndef __LINUX_ARM_SMCCC_H
#define __LINUX_ARM_SMCCC_H
+#include <linux/init.h>
#include <uapi/linux/const.h>
/*
* This file provides common defines for ARM SMC Calling Convention as
* specified in
- * http://infocenter.arm.com/help/topic/com.arm.doc.den0028a/index.html
+ * https://developer.arm.com/docs/den0028/latest
+ *
+ * This code is up-to-date with version DEN 0028 C
*/
#define ARM_SMCCC_STD_CALL _AC(0,U)
@@ -56,6 +59,7 @@
#define ARM_SMCCC_VERSION_1_0 0x10000
#define ARM_SMCCC_VERSION_1_1 0x10001
+#define ARM_SMCCC_VERSION_1_2 0x10002
#define ARM_SMCCC_VERSION_FUNC_ID \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
@@ -98,6 +102,19 @@ enum arm_smccc_conduit {
enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void);
/**
+ * arm_smccc_get_version()
+ *
+ * Returns the version to be used for SMCCCv1.1 or later.
+ *
+ * When SMCCCv1.1 or above is not present, returns SMCCCv1.0, but this
+ * does not imply the presence of firmware or a valid conduit. Caller
+ * handling SMCCCv1.0 must determine the conduit by other means.
+ */
+u32 arm_smccc_get_version(void);
+
+void __init arm_smccc_version_init(u32 version, enum arm_smccc_conduit conduit);
+
+/**
* struct arm_smccc_res - Result from SMC/HVC call
* @a0-a3 result values from registers 0 to 3
*/
@@ -314,10 +331,14 @@ asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1,
*/
#define arm_smccc_1_1_hvc(...) __arm_smccc_1_1(SMCCC_HVC_INST, __VA_ARGS__)
-/* Return codes defined in ARM DEN 0070A */
+/*
+ * Return codes defined in ARM DEN 0070A
+ * ARM DEN 0070A is now merged/consolidated into ARM DEN 0028 C
+ */
#define SMCCC_RET_SUCCESS 0
#define SMCCC_RET_NOT_SUPPORTED -1
#define SMCCC_RET_NOT_REQUIRED -2
+#define SMCCC_RET_INVALID_PARAMETER -3
/*
* Like arm_smccc_1_1* but always returns SMCCC_RET_NOT_SUPPORTED.