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| author | Laszlo Ersek <lersek@redhat.com> | 2014-03-04 08:01:49 +0000 |
|---|---|---|
| committer | jljusten <jljusten@6f19259b-4bc3-4df7-8a09-765794883524> | 2014-03-04 08:01:49 +0000 |
| commit | 14eb7a5be2d6415ca614fb62c28fd165eed3c572 (patch) | |
| tree | 0851e165ca3da9838603f326e70592519d327a71 /OvmfPkg/Library/QemuFwCfgLib | |
| parent | 979420df986e0b9ec3fe5cb2a1f72332a42c61c1 (diff) | |
| download | edk2-14eb7a5be2d6415ca614fb62c28fd165eed3c572.tar.gz edk2-14eb7a5be2d6415ca614fb62c28fd165eed3c572.tar.bz2 edk2-14eb7a5be2d6415ca614fb62c28fd165eed3c572.zip | |
OvmfPkg QemuFwCfgLib: determine if S3 support is explicitly enabled
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 <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
[jordan.l.justen@intel.com: check for enabled rather than disabled]
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15292 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'OvmfPkg/Library/QemuFwCfgLib')
| -rw-r--r-- | OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c index 3c5963f31b..92c85c1d3d 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 (BOOLEAN) (SystemStates[3] & BIT7);
+}
|