From: "Sami Mujawar" <sami.mujawar@arm.com>
To: Sughosh Ganu <sughosh.ganu@linaro.org>,
"devel@edk2.groups.io" <devel@edk2.groups.io>
Cc: Ard Biesheuvel <Ard.Biesheuvel@arm.com>,
Jiewen Yao <jiewen.yao@intel.com>,
Achin Gupta <Achin.Gupta@arm.com>, nd <nd@arm.com>
Subject: Re: [PATCH v1 02/12] ArmPkg/ArmSvcLib: Return x4-x7 in output parameters
Date: Tue, 10 Nov 2020 12:02:46 +0000 [thread overview]
Message-ID: <DB7PR08MB309774C209ECB2C75116C9C184E90@DB7PR08MB3097.eurprd08.prod.outlook.com> (raw)
In-Reply-To: <20201021113233.25548-3-sughosh.ganu@linaro.org>
Hi Sughosh,
Please find my response inline marked [SAMI].
General feedback:
- Add reference to the SMCC v1.2 spec and FF-A spec in the file header.
- Do you plan to submit a similar patch for AArch32?
- Can you update the function documentation for ArmCallSvc () in ArmPkg\Include\Library\ArmSvcLib.h, please?
Ref: https://edk2-docs.gitbook.io/edk-ii-c-coding-standards-specification/appendix_a_common_examples#functioon-declarations
Regards,
Sami Mujawar
-----Original Message-----
From: Sughosh Ganu <sughosh.ganu@linaro.org>
Sent: 21 October 2020 12:32 PM
To: devel@edk2.groups.io
Cc: Ard Biesheuvel <Ard.Biesheuvel@arm.com>; Sami Mujawar <Sami.Mujawar@arm.com>; Jiewen Yao <jiewen.yao@intel.com>; Achin Gupta <Achin.Gupta@arm.com>
Subject: [PATCH v1 02/12] ArmPkg/ArmSvcLib: Return x4-x7 in output parameters
From: Achin Gupta <achin.gupta@arm.com>
The Arm SMC calling convention standard v1.2 allows 8 input and output
parameter registers. The FF-A specification relies on this
communication. This patch extends the number of output registers
returned by ArmCallSvc() to match this convention.
Signed-off-by: Achin Gupta <achin.gupta@arm.com>
---
ArmPkg/Library/ArmSvcLib/AArch64/ArmSvc.S | 2 ++
1 file changed, 2 insertions(+)
diff --git a/ArmPkg/Library/ArmSvcLib/AArch64/ArmSvc.S b/ArmPkg/Library/ArmSvcLib/AArch64/ArmSvc.S
index ee265f94b9..8cb5c45582 100644
--- a/ArmPkg/Library/ArmSvcLib/AArch64/ArmSvc.S
+++ b/ArmPkg/Library/ArmSvcLib/AArch64/ArmSvc.S
@@ -36,6 +36,8 @@ ASM_PFX(ArmCallSvc):
// A SVC call can return up to 4 values - we do not need to store back x4-x7.
[SAMI] Please update the comment to reflect that 8 values can be returned.
[/SAMI]
stp x0, x1, [x9, #0]
stp x2, x3, [x9, #16]
+ stp x4, x5, [x9, #32]
+ stp x6, x7, [x9, #48]
mov x0, x9
--
2.17.1
next prev parent reply other threads:[~2020-11-10 12:03 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-21 11:32 [PATCH v1 00/12] Add support for using FF-A calls sughosh.ganu
2020-10-21 11:32 ` [PATCH v1 01/12] ArmPkg/IndustryStandard: Add barebones FF-A header Sughosh Ganu
2020-11-05 10:33 ` Sami Mujawar
2020-11-06 9:06 ` Sughosh Ganu
2020-10-21 11:32 ` [PATCH v1 02/12] ArmPkg/ArmSvcLib: Return x4-x7 in output parameters Sughosh Ganu
2020-11-10 12:02 ` Sami Mujawar [this message]
2020-10-21 11:32 ` [PATCH v1 03/12] StandaloneMmPkg: Use FF-A header file in Standalone MM Core entry point Sughosh Ganu
2020-10-21 11:32 ` [PATCH v1 04/12] ArmPkg: Introduce support for PcdFfaEnable Sughosh Ganu
2020-11-19 9:56 ` Sami Mujawar
2020-10-21 11:32 ` [PATCH v1 05/12] StandaloneMmPkg: Add the SPM version for FF-A Sughosh Ganu
2020-11-19 9:54 ` Sami Mujawar
2020-10-21 11:32 ` [PATCH v1 06/12] StandaloneMmPkg: Add option to use FF-A calls for getting SPM version Sughosh Ganu
2020-11-23 10:10 ` Sami Mujawar
2020-10-21 11:32 ` [PATCH v1 07/12] StandaloneMmPkg: Add option to use FF-A calls for communication with SPM Sughosh Ganu
2020-11-23 12:38 ` Sami Mujawar
2020-10-21 11:32 ` [PATCH v1 08/12] StandaloneMmPkg: Use FF-A header file in Standalone MM Arm MMU library Sughosh Ganu
2020-10-21 11:32 ` [PATCH v1 09/12] ArmPkg/StandaloneMmMmuLib: Add option to use FF-A calls to get memory region's permissions Sughosh Ganu
2020-11-23 13:26 ` Sami Mujawar
2020-10-21 11:32 ` [PATCH v1 10/12] ArmPkg/StandaloneMmMmuLib: Add option to use FF-A calls to set " Sughosh Ganu
2020-11-23 13:42 ` Sami Mujawar
[not found] ` <164A26E48323EBBE.21019@groups.io>
2020-11-23 14:21 ` [edk2-devel] " Sami Mujawar
2020-10-21 11:32 ` [PATCH v1 11/12] MdeModulePkg/VariableStandaloneMm: Set PcdFlashNvStorageVariableBase to Pcd Sughosh Ganu
2020-11-23 13:52 ` Sami Mujawar
2020-10-21 11:32 ` [PATCH v1 12/12] StandaloneMmPkg: Allow sending FFA Direct Request message to StandaloneMm Sughosh Ganu
2020-11-23 14:17 ` Sami Mujawar
2020-11-05 10:29 ` [PATCH v1 00/12] Add support for using FF-A calls Sami Mujawar
2020-11-23 14:33 ` Sami Mujawar
2020-11-24 7:48 ` Sughosh Ganu
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