QemuFwCfgSec.c File Reference

#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/QemuFwCfgLib.h>
#include "QemuFwCfgLibInternal.h"

Go to the source code of this file.

Functions
BOOLEAN EFIAPI	QemuFwCfgIsAvailable (VOID)
BOOLEAN	InternalQemuFwCfgIsAvailable (VOID)
BOOLEAN	InternalQemuFwCfgDmaIsAvailable (VOID)
VOID	InternalQemuFwCfgDmaBytes (IN UINT32 Size, IN OUT VOID *Buffer OPTIONAL, IN UINT32 Control)

Detailed Description

Stateless fw_cfg library implementation.

Clients must call QemuFwCfgIsAvailable() first.

Copyright (C) 2013, Red Hat, Inc. Copyright (c) 2011 - 2013, Intel Corporation. All rights reserved.
Copyright (c) 2017, Advanced Micro Devices. All rights reserved.

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

Definition in file QemuFwCfgSec.c.

Function Documentation

InternalQemuFwCfgDmaBytes()

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 110 of file QemuFwCfgSec.c.

InternalQemuFwCfgDmaIsAvailable()

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 87 of file QemuFwCfgSec.c.

InternalQemuFwCfgIsAvailable()

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 67 of file QemuFwCfgSec.c.

QemuFwCfgIsAvailable()

BOOLEAN EFIAPI QemuFwCfgIsAvailable

(

VOID

)

Returns a boolean indicating if the firmware configuration interface is available or not.

This function may change fw_cfg state.

Return values

TRUE	The interface is available
FALSE	The interface is not available

Definition at line 32 of file QemuFwCfgSec.c.