From: "Ankur Arora" <ankur.a.arora@oracle.com>
To: devel@edk2.groups.io
Cc: lersek@redhat.com, imammedo@redhat.com,
boris.ostrovsky@oracle.com,
Ankur Arora <ankur.a.arora@oracle.com>,
Michael D Kinney <michael.d.kinney@intel.com>,
Liming Gao <gaoliming@byosoft.com.cn>,
Zhiguang Liu <zhiguang.liu@intel.com>,
Aaron Young <aaron.young@oracle.com>
Subject: [PATCH v2 10/10] MdePkg: use CpuPause() in CpuDeadLoop()
Date: Thu, 7 Jan 2021 11:55:15 -0800 [thread overview]
Message-ID: <20210107195515.106158-11-ankur.a.arora@oracle.com> (raw)
In-Reply-To: <20210107195515.106158-1-ankur.a.arora@oracle.com>
Use CpuPause() to allow the CPU to go into a lower power state
state while we spin wait.
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Aaron Young <aaron.young@oracle.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3132
Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
---
MdePkg/Library/BaseLib/CpuDeadLoop.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/MdePkg/Library/BaseLib/CpuDeadLoop.c b/MdePkg/Library/BaseLib/CpuDeadLoop.c
index 9e110cacbc96..e76312de7b4e 100644
--- a/MdePkg/Library/BaseLib/CpuDeadLoop.c
+++ b/MdePkg/Library/BaseLib/CpuDeadLoop.c
@@ -28,5 +28,6 @@ CpuDeadLoop (
{
volatile UINTN Index;
- for (Index = 0; Index == 0;);
+ for (Index = 0; Index == 0;)
+ CpuPause();
}
--
2.9.3
next prev parent reply other threads:[~2021-01-07 19:57 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-07 19:55 [PATCH v2 00/10] support CPU hot-unplug Ankur Arora
2021-01-07 19:55 ` [PATCH v2 01/10] OvmfPkg/CpuHotplugSmm: move CPU Hotplug into PlugCpus() Ankur Arora
2021-01-07 19:55 ` [PATCH v2 02/10] OvmfPkg/CpuHotplugSmm: handle Hot-unplug events Ankur Arora
2021-01-07 19:55 ` [PATCH v2 03/10] OvmfPkg/CpuHotplugSmm: add Qemu CpuStatus helper Ankur Arora
2021-01-07 19:55 ` [PATCH v2 04/10] OvmfPkg/CpuHotplugSmm: handle CPU hot-unplug Ankur Arora
2021-01-07 19:55 ` [PATCH v2 05/10] MdePkg: add MmRegisterShutdownInterface() Ankur Arora
2021-01-07 20:48 ` [edk2-devel] " Laszlo Ersek
2021-01-07 21:00 ` Laszlo Ersek
2021-01-07 21:19 ` Ankur Arora
2021-01-07 21:50 ` Laszlo Ersek
2021-01-07 21:45 ` Laszlo Ersek
2021-01-07 23:42 ` Ankur Arora
2021-01-07 19:55 ` [PATCH v2 06/10] UefiCpuPkg/PiSmmCpuDxeSmm: initialize IsBsp Ankur Arora
2021-01-07 19:55 ` [PATCH v2 07/10] UefiCpuPkg/SmmCpuFeaturesLib: add IsBsp as a param to SmmCpuFeaturesRendezvousExit() Ankur Arora
2021-01-07 19:55 ` [PATCH v2 08/10] OvmfCpuPkg/CpuHotplug: add a hot-unplug handler called at SMI exit Ankur Arora
2021-01-07 19:55 ` [PATCH v2 09/10] OvmfPkg/SmmControl2Dxe: negotiate ICH9_LPC_SMI_F_CPU_HOT_UNPLUG Ankur Arora
2021-01-07 19:55 ` Ankur Arora [this message]
2021-01-07 22:30 ` [edk2-devel] [PATCH v2 10/10] MdePkg: use CpuPause() in CpuDeadLoop() Michael D Kinney
2021-01-07 23:43 ` Ankur Arora
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