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ARM: opcodes: Opcode definitions for the Virtualization Extensions

Message ID 1346676569-4085-4-git-send-email-dave.martin@linaro.org
State Accepted
Headers show

Commit Message

Dave Martin Sept. 3, 2012, 12:49 p.m. UTC 
For now, this patch just adds a definition for the HVC instruction.
More can be added here later, as needed.

Now that we have a real example of how to use the opcode injection
macros properly, this patch also adds a cross-reference from the
explanation in opcodes.h (since without an example, figuring out
how to use the macros is not that easy).

Signed-off-by: Dave Martin <dave.martin@linaro.org>
Acked-by: Nicolas Pitre <nico@linaro.org>
---
KernelVersion: 3.6-rc4
diff mbox

Patch

diff --git a/arch/arm/include/asm/opcodes-virt.h b/arch/arm/include/asm/opcodes-virt.h
new file mode 100644
index 0000000..b85665a
--- /dev/null
+++ b/arch/arm/include/asm/opcodes-virt.h
@@ -0,0 +1,29 @@ 
+/*
+ * opcodes-virt.h: Opcode definitions for the ARM virtualization extensions
+ * Copyright (C) 2012  Linaro Limited
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#ifndef __ASM_ARM_OPCODES_VIRT_H
+#define __ASM_ARM_OPCODES_VIRT_H
+
+#include <asm/opcodes.h>
+
+#define __HVC(imm16) __inst_arm_thumb32(				\
+	0xE1400070 | (((imm16) & 0xFFF0) << 4) | ((imm16) & 0x000F),	\
+	0xF7E08000 | (((imm16) & 0xF000) << 4) | ((imm16) & 0x0FFF)	\
+)
+
+#endif /* ! __ASM_ARM_OPCODES_VIRT_H */
diff --git a/arch/arm/include/asm/opcodes.h b/arch/arm/include/asm/opcodes.h
index f7937e1..74e211a 100644
--- a/arch/arm/include/asm/opcodes.h
+++ b/arch/arm/include/asm/opcodes.h
@@ -193,6 +193,8 @@  extern asmlinkage unsigned int arm_check_condition(u32 opcode, u32 psr);
  * specify the ARM and Thumb alternatives at the same time.  This ensures
  * that the correct opcode gets emitted depending on the instruction set
  * used for the kernel build.
+ *
+ * Look at opcodes-virt.h for an example of how to use these macros.
  */
 #include <linux/stringify.h>