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From: Geoff Levand <geoff@infradead.org>
To: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>
Cc: marc.zyngier@arm.com, kexec@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	christoffer.dall@linaro.org
Subject: [PATCH V2 04/13] arm64: Add new hcall HVC_CALL_FUNC
Date: Wed, 10 Sep 2014 11:11:49 -0700	[thread overview]
Message-ID: <1410372709.30895.0.camel@smoke> (raw)
In-Reply-To: <ea28cfef061d06e86704845a877802e057749b39.1410302383.git.geoff@infradead.org>

Add the new hcall HVC_CALL_FUNC that allows execution of a function at EL2.
During CPU reset the CPU must be brought to the exception level it had on
entry to the kernel.  The HVC_CALL_FUNC hcall will provide the mechanism
needed for this exception level switch.

Signed-off-by: Geoff Levand <geoff@infradead.org>
---
 arch/arm64/include/asm/virt.h | 13 +++++++++++++
 arch/arm64/kernel/hyp-stub.S  | 10 ++++++++++
 2 files changed, 23 insertions(+)

diff --git a/arch/arm64/include/asm/virt.h b/arch/arm64/include/asm/virt.h
index 894fe53..cc4250c 100644
--- a/arch/arm64/include/asm/virt.h
+++ b/arch/arm64/include/asm/virt.h
@@ -41,6 +41,19 @@
 
 #define HVC_KVM_CALL_HYP 3
 
+/*
+ * HVC_CALL_FUNC - Execute a function at EL2.
+ *
+ * @x0: Physical address of the funtion to be executed.
+ * @x1: Passed as the first argument to the function.
+ * @x2: Passed as the second argument to the function.
+ * @x3: Passed as the third argument to the function.
+ *
+ * The called function must preserve the contents of register x18.
+ */
+
+#define HVC_CALL_FUNC 4
+
 #ifndef __ASSEMBLY__
 
 /*
diff --git a/arch/arm64/kernel/hyp-stub.S b/arch/arm64/kernel/hyp-stub.S
index 9ab5f70..27d786d 100644
--- a/arch/arm64/kernel/hyp-stub.S
+++ b/arch/arm64/kernel/hyp-stub.S
@@ -75,7 +75,17 @@ el1_sync:
 1:	cmp	x10, #HVC_SET_VECTORS
 	b.ne	1f
 	msr	vbar_el2, x0
+	b	2f
 
+1:	cmp	x10, #HVC_CALL_FUNC
+	b.ne    1f
+	mov	x18, lr
+	mov	lr, x0
+	mov	x0, x1
+	mov	x1, x2
+	mov	x2, x3
+	blr	lr
+	mov	lr, x18
 1:
 2:	eret
 ENDPROC(el1_sync)
-- 
1.9.1




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WARNING: multiple messages have this Message-ID (diff)
From: geoff@infradead.org (Geoff Levand)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH V2 04/13] arm64: Add new hcall HVC_CALL_FUNC
Date: Wed, 10 Sep 2014 11:11:49 -0700	[thread overview]
Message-ID: <1410372709.30895.0.camel@smoke> (raw)
In-Reply-To: <ea28cfef061d06e86704845a877802e057749b39.1410302383.git.geoff@infradead.org>

Add the new hcall HVC_CALL_FUNC that allows execution of a function at EL2.
During CPU reset the CPU must be brought to the exception level it had on
entry to the kernel.  The HVC_CALL_FUNC hcall will provide the mechanism
needed for this exception level switch.

Signed-off-by: Geoff Levand <geoff@infradead.org>
---
 arch/arm64/include/asm/virt.h | 13 +++++++++++++
 arch/arm64/kernel/hyp-stub.S  | 10 ++++++++++
 2 files changed, 23 insertions(+)

diff --git a/arch/arm64/include/asm/virt.h b/arch/arm64/include/asm/virt.h
index 894fe53..cc4250c 100644
--- a/arch/arm64/include/asm/virt.h
+++ b/arch/arm64/include/asm/virt.h
@@ -41,6 +41,19 @@
 
 #define HVC_KVM_CALL_HYP 3
 
+/*
+ * HVC_CALL_FUNC - Execute a function at EL2.
+ *
+ * @x0: Physical address of the funtion to be executed.
+ * @x1: Passed as the first argument to the function.
+ * @x2: Passed as the second argument to the function.
+ * @x3: Passed as the third argument to the function.
+ *
+ * The called function must preserve the contents of register x18.
+ */
+
+#define HVC_CALL_FUNC 4
+
 #ifndef __ASSEMBLY__
 
 /*
diff --git a/arch/arm64/kernel/hyp-stub.S b/arch/arm64/kernel/hyp-stub.S
index 9ab5f70..27d786d 100644
--- a/arch/arm64/kernel/hyp-stub.S
+++ b/arch/arm64/kernel/hyp-stub.S
@@ -75,7 +75,17 @@ el1_sync:
 1:	cmp	x10, #HVC_SET_VECTORS
 	b.ne	1f
 	msr	vbar_el2, x0
+	b	2f
 
+1:	cmp	x10, #HVC_CALL_FUNC
+	b.ne    1f
+	mov	x18, lr
+	mov	lr, x0
+	mov	x0, x1
+	mov	x1, x2
+	mov	x2, x3
+	blr	lr
+	mov	lr, x18
 1:
 2:	eret
 ENDPROC(el1_sync)
-- 
1.9.1

  parent reply	other threads:[~2014-09-10 18:11 UTC|newest]

Thread overview: 80+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-09 22:51 [PATCH 00/13] arm64 kexec kernel patches V2 Geoff Levand
2014-09-09 22:51 ` Geoff Levand
2014-09-09 22:49 ` [PATCH 02/13] arm64/kvm: Fix assembler compatibility of macros Geoff Levand
2014-09-09 22:49   ` Geoff Levand
2014-09-10  8:40   ` Ard Biesheuvel
2014-09-10  8:40     ` Ard Biesheuvel
2014-09-10 16:35     ` Geoff Levand
2014-09-10 16:35       ` Geoff Levand
2014-09-10 17:09       ` Ard Biesheuvel
2014-09-10 17:09         ` Ard Biesheuvel
2014-09-15 16:14         ` Mark Rutland
2014-09-15 16:14           ` Mark Rutland
2014-09-10 18:04   ` [PATCH V2 " Geoff Levand
2014-09-10 18:04     ` Geoff Levand
2014-09-09 22:49 ` [PATCH 06/13] arm64: Add new routine read_cpu_properties Geoff Levand
2014-09-09 22:49   ` Geoff Levand
2014-09-15 18:42   ` Mark Rutland
2014-09-15 18:42     ` Mark Rutland
2014-09-25  0:23     ` Geoff Levand
2014-09-25  0:23       ` Geoff Levand
2014-09-09 22:49 ` [PATCH 05/13] arm64: Add EL2 switch to soft_restart Geoff Levand
2014-09-09 22:49   ` Geoff Levand
2014-09-09 22:49 ` [PATCH 01/13] arm64: Add ESR_EL2_EC macros to hyp-stub Geoff Levand
2014-09-09 22:49   ` Geoff Levand
2014-09-15 16:10   ` Mark Rutland
2014-09-15 16:10     ` Mark Rutland
2014-09-22 21:45     ` Geoff Levand
2014-09-22 21:45       ` Geoff Levand
2014-09-09 22:49 ` [PATCH 03/13] arm64: Convert hcalls to use ISS field Geoff Levand
2014-09-09 22:49   ` Geoff Levand
2014-09-11 16:14   ` Arun Chandran
2014-09-11 16:14     ` Arun Chandran
2014-09-15 17:57   ` Mark Rutland
2014-09-15 17:57     ` Mark Rutland
2014-09-22 21:46     ` Geoff Levand
2014-09-22 21:46       ` Geoff Levand
2014-09-09 22:49 ` [PATCH 04/13] arm64: Add new hcall HVC_CALL_FUNC Geoff Levand
2014-09-09 22:49   ` Geoff Levand
2014-09-10 17:07   ` Will Deacon
2014-09-10 17:07     ` Will Deacon
2014-09-10 17:23     ` Geoff Levand
2014-09-10 17:23       ` Geoff Levand
2014-09-10 17:35       ` Will Deacon
2014-09-10 17:35         ` Will Deacon
2014-09-10 18:11   ` Geoff Levand [this message]
2014-09-10 18:11     ` [PATCH V2 " Geoff Levand
2014-09-15 18:11   ` [PATCH " Mark Rutland
2014-09-15 18:11     ` Mark Rutland
2014-09-25  0:24     ` Geoff Levand
2014-09-25  0:24       ` Geoff Levand
2014-09-09 22:49 ` [PATCH 07/13] arm64: Add new routine local_disable Geoff Levand
2014-09-09 22:49   ` Geoff Levand
2014-09-15 18:56   ` Mark Rutland
2014-09-15 18:56     ` Mark Rutland
2014-09-25  0:24     ` Geoff Levand
2014-09-25  0:24       ` Geoff Levand
2014-09-09 22:49 ` [PATCH 11/13] arm64/kexec: Add core kexec support Geoff Levand
2014-09-09 22:49   ` Geoff Levand
2014-09-18  1:13   ` Mark Rutland
2014-09-18  1:13     ` Mark Rutland
2014-09-25  0:25     ` Geoff Levand
2014-09-25  0:25       ` Geoff Levand
2014-09-09 22:49 ` [PATCH 10/13] arm64/kexec: Revert change to machine_shutdown() Geoff Levand
2014-09-09 22:49   ` Geoff Levand
2014-09-15 19:20   ` Mark Rutland
2014-09-15 19:20     ` Mark Rutland
2014-09-09 22:49 ` [PATCH 13/13] arm64/kexec: Add kexec_ignore_compat_check param Geoff Levand
2014-09-09 22:49   ` Geoff Levand
2014-09-09 22:49 ` [PATCH 08/13] arm64: Use cpu_ops for smp_stop Geoff Levand
2014-09-09 22:49   ` Geoff Levand
2014-09-15 19:06   ` Mark Rutland
2014-09-15 19:06     ` Mark Rutland
2014-09-25  0:24     ` Geoff Levand
2014-09-25  0:24       ` Geoff Levand
2014-09-09 22:49 ` [PATCH 12/13] arm64/kexec: Enable kexec in the arm64 defconfig Geoff Levand
2014-09-09 22:49   ` Geoff Levand
2014-09-09 22:49 ` [PATCH 09/13] arm64/kexec: Kexec expects cpu_die Geoff Levand
2014-09-09 22:49   ` Geoff Levand
2014-09-15 19:10   ` Mark Rutland
2014-09-15 19:10     ` Mark Rutland

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