From: Julien Grall <julien.grall@arm.com>
Date: Fri, 23 Feb 2018 18:57:19 +0000 (+0000)
Subject: xen/arm: smccc: Add macros SMCCC_VERSION, SMCCC_VERSION_{MINOR, MAJOR}
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=479fab92d356e5a09f5db4596017419cf4023a9f;p=people%2Froyger%2Fxen.git

xen/arm: smccc: Add macros SMCCC_VERSION, SMCCC_VERSION_{MINOR, MAJOR}

Add macros SMCCC_VERSION, SMCCC_VERSION_{MINOR, MAJOR} to easily convert
between a 32-bit value and a version number. The encoding is based on
2.2.2 in "Firmware interfaces for mitigation CVE-2017-5715" (ARM DEN 0070A).

Also re-use them to define ARM_SMCCC_VERSION_1_0 and ARM_SMCCC_VERSION_1_1.

Signed-off-by: Julien Grall <julien.grall@arm.com>
Reviewed-by: Volodymyr Babchuk <volodymyr_babchuk@epam.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>
---

diff --git a/xen/include/asm-arm/smccc.h b/xen/include/asm-arm/smccc.h
index 30208d12ca..d0240d64bf 100644
--- a/xen/include/asm-arm/smccc.h
+++ b/xen/include/asm-arm/smccc.h
@@ -16,8 +16,20 @@
 #ifndef __ASM_ARM_SMCCC_H__
 #define __ASM_ARM_SMCCC_H__
 
-#define ARM_SMCCC_VERSION_1_0   0x10000
-#define ARM_SMCCC_VERSION_1_1   0x10001
+#define SMCCC_VERSION_MAJOR_SHIFT            16
+#define SMCCC_VERSION_MINOR_MASK             \
+        ((1U << SMCCC_VERSION_MAJOR_SHIFT) - 1)
+#define SMCCC_VERSION_MAJOR_MASK             ~SMCCC_VERSION_MINOR_MASK
+#define SMCCC_VERSION_MAJOR(ver)             \
+        (((ver) & SMCCC_VERSION_MAJOR_MASK) >> SMCCC_VERSION_MAJOR_SHIFT)
+#define SMCCC_VERSION_MINOR(ver)             \
+        ((ver) & SMCCC_VERSION_MINOR_MASK)
+
+#define SMCCC_VERSION(major, minor)          \
+    (((major) << SMCCC_VERSION_MAJOR_SHIFT) | (minor))
+
+#define ARM_SMCCC_VERSION_1_0   SMCCC_VERSION(1, 0)
+#define ARM_SMCCC_VERSION_1_1   SMCCC_VERSION(1, 1)
 
 /*
  * This file provides common defines for ARM SMC Calling Convention as