/**
Retrieves attributes, insures positive polarity of attribute bits, returns
resulting attributes in output parameter.
@param This Calling context
@param Attributes output buffer which contains attributes
@retval EFI_SUCCESS Successfully got volume attributes
**/
EFI_STATUS
EFIAPI
FvGetVolumeAttributes (
IN CONST EFI_FIRMWARE_VOLUME2_PROTOCOL *This,
OUT EFI_FV_ATTRIBUTES *Attributes
)
{
EFI_STATUS Status;
FV_DEVICE *FvDevice;
EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *Fvb;
EFI_FVB_ATTRIBUTES_2 FvbAttributes;
FvDevice = FV_DEVICE_FROM_THIS (This);
Fvb = FvDevice->Fvb;
//
// First get the Firmware Volume Block Attributes
//
Status = Fvb->GetAttributes (Fvb, &FvbAttributes);
FvbAttributes &= 0xfffff0ff;
*Attributes = FvbAttributes;
*Attributes |= EFI_FV2_WRITE_POLICY_RELIABLE;
return Status;
}
/**
Retrieves attributes, insures positive polarity of attribute bits, returns
resulting attributes in output parameter.
@param This Calling context
@param Attributes output buffer which contains attributes
@retval EFI_SUCCESS Successfully got volume attributes
**/
EFI_STATUS
EFIAPI
FvGetVolumeAttributes (
IN CONST EFI_FIRMWARE_VOLUME2_PROTOCOL *This,
OUT EFI_FV_ATTRIBUTES *Attributes
)
{
EFI_STATUS Status;
FV_DEVICE *FvDevice;
EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *Fvb;
EFI_FVB_ATTRIBUTES_2 FvbAttributes;
FvDevice = FV_DEVICE_FROM_THIS (This);
Fvb = FvDevice->Fvb;
//
// First get the Firmware Volume Block Attributes
//
Status = Fvb->GetAttributes (Fvb, &FvbAttributes);
//
// Mask out Fvb bits that are not defined in FV
//
FvbAttributes &= 0xfffff0ff;
*Attributes = (EFI_FV_ATTRIBUTES)FvbAttributes;
return Status;
}
/**
Sets current attributes for volume.
@param This Calling context
@param Attributes On input, FvAttributes is a pointer to
an EFI_FV_ATTRIBUTES containing the
desired firmware volume settings. On
successful return, it contains the new
settings of the firmware volume. On
unsuccessful return, FvAttributes is not
modified and the firmware volume
settings are not changed.
@retval EFI_SUCCESS The requested firmware volume attributes
were set and the resulting
EFI_FV_ATTRIBUTES is returned in
FvAttributes.
@retval EFI_ACCESS_DENIED Atrribute is locked down.
@retval EFI_INVALID_PARAMETER Atrribute is not valid.
**/
EFI_STATUS
EFIAPI
FvSetVolumeAttributes (
IN CONST EFI_FIRMWARE_VOLUME2_PROTOCOL *This,
IN OUT EFI_FV_ATTRIBUTES *Attributes
)
{
EFI_STATUS Status;
FV_DEVICE *FvDevice;
EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *Fvb;
EFI_FVB_ATTRIBUTES_2 OldFvbAttributes;
EFI_FVB_ATTRIBUTES_2 NewFvbAttributes;
UINT64 NewStatus;
UINT32 Capabilities;
FvDevice = FV_DEVICE_FROM_THIS (This);
Fvb = FvDevice->Fvb;
//
// First get the current Volume Attributes
//
Status = Fvb->GetAttributes (
Fvb,
&OldFvbAttributes
);
if ((OldFvbAttributes & EFI_FVB2_LOCK_STATUS) != 0) {
return EFI_ACCESS_DENIED;
}
//
// Only status attributes can be updated.
//
Capabilities = OldFvbAttributes & EFI_FVB2_CAPABILITIES;
NewStatus = (*Attributes) & EFI_FVB2_STATUS;
//
// Test read disable
//
if ((Capabilities & EFI_FVB2_READ_DISABLED_CAP) == 0) {
if ((NewStatus & EFI_FVB2_READ_STATUS) == 0) {
return EFI_INVALID_PARAMETER;
}
}
//
// Test read enable
//
if ((Capabilities & EFI_FVB2_READ_ENABLED_CAP) == 0) {
if ((NewStatus & EFI_FVB2_READ_STATUS) != 0) {
return EFI_INVALID_PARAMETER;
}
}
//
// Test write disable
//
if ((Capabilities & EFI_FVB2_WRITE_DISABLED_CAP) == 0) {
if ((NewStatus & EFI_FVB2_WRITE_STATUS) == 0) {
return EFI_INVALID_PARAMETER;
}
}
//
// Test write enable
//
if ((Capabilities & EFI_FVB2_WRITE_ENABLED_CAP) == 0) {
if ((NewStatus & EFI_FVB2_WRITE_STATUS) != 0) {
return EFI_INVALID_PARAMETER;
}
}
//
// Test lock
//
if ((Capabilities & EFI_FVB2_LOCK_CAP) == 0) {
if ((NewStatus & EFI_FVB2_LOCK_STATUS) != 0) {
return EFI_INVALID_PARAMETER;
}
}
NewFvbAttributes = OldFvbAttributes & (0xFFFFFFFF & (~EFI_FVB2_STATUS));
NewFvbAttributes |= NewStatus;
Status = Fvb->SetAttributes (
Fvb,
&NewFvbAttributes
);
if (EFI_ERROR (Status)) {
return Status;
}
*Attributes = 0;
This->GetVolumeAttributes (
This,
Attributes
);
return EFI_SUCCESS;
}
