From: Laszlo Ersek <ler...@redhat.com>
Such a packaged query function will come in handy in the following
patches.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <ler...@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.jus...@intel.com>
[jordan.l.jus...@intel.com: check for enabled rather than disabled]
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.jus...@intel.com>
---
OvmfPkg/Include/Library/QemuFwCfgLib.h | 14 ++++++++++++++
OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c | 28 ++++++++++++++++++++++++++++
2 files changed, 42 insertions(+)
diff --git a/OvmfPkg/Include/Library/QemuFwCfgLib.h
b/OvmfPkg/Include/Library/QemuFwCfgLib.h
index 2519fc2..8d3b835 100644
--- a/OvmfPkg/Include/Library/QemuFwCfgLib.h
+++ b/OvmfPkg/Include/Library/QemuFwCfgLib.h
@@ -214,5 +214,19 @@ InternalQemuFwCfgIsAvailable (
VOID
);
+
+/**
+ Determine if S3 support is explicitly enabled.
+
+ @retval TRUE if S3 support is explicitly enabled.
+ FALSE otherwise. This includes unavailability of the firmware
+ configuration interface.
+**/
+BOOLEAN
+EFIAPI
+QemuFwCfgS3Enabled (
+ VOID
+ );
+
#endif
diff --git a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c
b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c
index 3c5963f..543c22c 100644
--- a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c
+++ b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c
@@ -294,3 +294,31 @@ QemuFwCfgFindFile (
return RETURN_NOT_FOUND;
}
+
+
+/**
+ Determine if S3 support is explicitly enabled.
+
+ @retval TRUE if S3 support is explicitly enabled.
+ FALSE otherwise. This includes unavailability of the firmware
+ configuration interface.
+**/
+BOOLEAN
+EFIAPI
+QemuFwCfgS3Enabled (
+ VOID
+ )
+{
+ RETURN_STATUS Status;
+ FIRMWARE_CONFIG_ITEM FwCfgItem;
+ UINTN FwCfgSize;
+ UINT8 SystemStates[6];
+
+ Status = QemuFwCfgFindFile ("etc/system-states", &FwCfgItem, &FwCfgSize);
+ if (Status != RETURN_SUCCESS || FwCfgSize != sizeof SystemStates) {
+ return FALSE;
+ }
+ QemuFwCfgSelectItem (FwCfgItem);
+ QemuFwCfgReadBytes (sizeof SystemStates, SystemStates);
+ return (SystemStates[3] & BIT7) != 0 ? TRUE : FALSE;
+}
--
1.9.rc1
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