Functions
BOOLEAN	InternalQemuFwCfgIsAvailable (VOID)

BOOLEAN	InternalQemuFwCfgDmaIsAvailable (VOID)

VOID	InternalQemuFwCfgDmaBytes (IN UINT32 Size, IN OUT VOID *Buffer OPTIONAL, IN UINT32 Control)

BOOLEAN	QemuFwCfgIsTdxGuest (VOID)

Detailed Description

Internal interfaces specific to the QemuFwCfgLib instances in OvmfPkg.

SPDX-License-Identifier: BSD-2-Clause-Patent

Function Documentation

VOID InternalQemuFwCfgDmaBytes	(	IN UINT32	Size,
		IN OUT VOID *Buffer	OPTIONAL,
		IN UINT32	Control
	)

Transfer an array of bytes, or skip a number of bytes, using the DMA interface.

Parameters

[in]	Size	Size in bytes to transfer or skip.
[in,out]	Buffer	Buffer to read data into or write data from. Ignored, and may be NULL, if Size is zero, or Control is FW_CFG_DMA_CTL_SKIP.
[in]	Control	One of the following: FW_CFG_DMA_CTL_WRITE - write to fw_cfg from Buffer. FW_CFG_DMA_CTL_READ - read from fw_cfg into Buffer. FW_CFG_DMA_CTL_SKIP - skip bytes in fw_cfg.

Definition at line 387 of file QemuFwCfgDxe.c.

BOOLEAN InternalQemuFwCfgDmaIsAvailable ( VOID )

Returns a boolean indicating whether QEMU provides the DMA-like access method for fw_cfg.

Return values

TRUE	The DMA-like access method is available.
FALSE	The DMA-like access method is unavailable.

Definition at line 141 of file QemuFwCfgDxe.c.

BOOLEAN InternalQemuFwCfgIsAvailable ( VOID )

Returns a boolean indicating if the firmware configuration interface is available for library-internal purposes.

This function never changes fw_cfg state.

Return values

TRUE	The interface is available internally.
FALSE	The interface is not available internally.

Definition at line 126 of file QemuFwCfgDxe.c.

BOOLEAN QemuFwCfgIsTdxGuest ( VOID )

Check if it is Tdx guest

Return values

TRUE	It is Tdx guest
FALSE	It is not Tdx guest