diff options
| author |   Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
|---|---|---|
| committer | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
| commit | af1a266670d040d2f4083ff309d732d648afba2a (patch) | |
| tree | 2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/edk2/OvmfPkg/Library/QemuFwCfgS3Lib/QemuFwCfgS3PeiDxe.c | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/edk2/OvmfPkg/Library/QemuFwCfgS3Lib/QemuFwCfgS3PeiDxe.c')
| -rw-r--r-- | roms/edk2/OvmfPkg/Library/QemuFwCfgS3Lib/QemuFwCfgS3PeiDxe.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/roms/edk2/OvmfPkg/Library/QemuFwCfgS3Lib/QemuFwCfgS3PeiDxe.c b/roms/edk2/OvmfPkg/Library/QemuFwCfgS3Lib/QemuFwCfgS3PeiDxe.c new file mode 100644 index 000000000..5557c70aa --- /dev/null +++ b/roms/edk2/OvmfPkg/Library/QemuFwCfgS3Lib/QemuFwCfgS3PeiDxe.c @@ -0,0 +1,42 @@ +/** @file
+ Shared code for the PEI fw_cfg and DXE fw_cfg instances of the QemuFwCfgS3Lib
+ class.
+
+ Copyright (C) 2017, Red Hat, Inc.
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#include <Library/QemuFwCfgLib.h>
+#include <Library/QemuFwCfgS3Lib.h>
+
+/**
+ Determine if S3 support is explicitly enabled.
+
+ @retval TRUE If S3 support is explicitly enabled. Other functions in this
+ library may be called (subject to their individual
+ restrictions).
+
+ FALSE Otherwise. This includes unavailability of the firmware
+ configuration interface. No other function in this library
+ must be called.
+**/
+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);
+}
|