QemuFlash.c File Reference

#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/MemEncryptSevLib.h>
#include <Library/PcdLib.h>
#include "QemuFlash.h"

Go to the source code of this file.

Macros
#define	WRITE_BYTE_CMD   0x10
#define	BLOCK_ERASE_CMD   0x20
#define	CLEAR_STATUS_CMD   0x50
#define	READ_STATUS_CMD   0x70
#define	READ_DEVID_CMD   0x90
#define	BLOCK_ERASE_CONFIRM_CMD   0xd0
#define	READ_ARRAY_CMD   0xff
#define	CLEARED_ARRAY_STATUS   0x00

Functions
STATIC volatile UINT8 *	QemuFlashPtr (IN EFI_LBA Lba, IN UINTN Offset)
STATIC BOOLEAN	QemuFlashDetected (VOID)
EFI_STATUS	QemuFlashRead (IN EFI_LBA Lba, IN UINTN Offset, IN UINTN *NumBytes, IN UINT8 *Buffer)
EFI_STATUS	QemuFlashWrite (IN EFI_LBA Lba, IN UINTN Offset, IN UINTN *NumBytes, IN UINT8 *Buffer)
EFI_STATUS	QemuFlashEraseBlock (IN EFI_LBA Lba)
EFI_STATUS	QemuFlashInitialize (VOID)

Variables
UINT8 *	mFlashBase
STATIC UINTN	mFdBlockSize = 0
STATIC UINTN	mFdBlockCount = 0

Detailed Description

OVMF support for QEMU system firmware flash device

Copyright (c) 2009 - 2013, Intel Corporation. All rights reserved.

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

Definition in file QemuFlash.c.

Macro Definition Documentation

BLOCK_ERASE_CMD

#define BLOCK_ERASE_CMD   0x20

Definition at line 18 of file QemuFlash.c.

BLOCK_ERASE_CONFIRM_CMD

#define BLOCK_ERASE_CONFIRM_CMD   0xd0

Definition at line 22 of file QemuFlash.c.

CLEAR_STATUS_CMD

#define CLEAR_STATUS_CMD   0x50

Definition at line 19 of file QemuFlash.c.

CLEARED_ARRAY_STATUS

#define CLEARED_ARRAY_STATUS   0x00

Definition at line 25 of file QemuFlash.c.

READ_ARRAY_CMD

#define READ_ARRAY_CMD   0xff

Definition at line 23 of file QemuFlash.c.

READ_DEVID_CMD

#define READ_DEVID_CMD   0x90

Definition at line 21 of file QemuFlash.c.

READ_STATUS_CMD

#define READ_STATUS_CMD   0x70

Definition at line 20 of file QemuFlash.c.

WRITE_BYTE_CMD

#define WRITE_BYTE_CMD   0x10

Definition at line 17 of file QemuFlash.c.

Function Documentation

QemuFlashDetected()

STATIC BOOLEAN QemuFlashDetected

(

VOID

)

Determines if the QEMU flash memory device is present.

Return values

FALSE	The QEMU flash device is not present.
TRUE	The QEMU flash device is present.

Definition at line 51 of file QemuFlash.c.

QemuFlashEraseBlock()

EFI_STATUS QemuFlashEraseBlock

(

IN EFI_LBA

Lba

)

Erase a QEMU Flash block

Parameters

Lba	The logical block index to erase.

Definition at line 234 of file QemuFlash.c.

QemuFlashInitialize()

EFI_STATUS QemuFlashInitialize

(

VOID

)

Initializes QEMU flash memory support

Return values

EFI_WRITE_PROTECTED	The QEMU flash device is not present.
EFI_SUCCESS	The QEMU flash device is supported.

Definition at line 258 of file QemuFlash.c.

QemuFlashPtr()

STATIC volatile UINT8 * QemuFlashPtr	(	IN EFI_LBA	Lba,
		IN UINTN	Offset
	)

Definition at line 34 of file QemuFlash.c.

QemuFlashRead()

EFI_STATUS QemuFlashRead	(	IN EFI_LBA	Lba,
		IN UINTN	Offset,
		IN UINTN *	NumBytes,
		IN UINT8 *	Buffer
	)

Read from QEMU Flash

Parameters

[in]	Lba	The starting logical block index to read from.
[in]	Offset	Offset into the block at which to begin reading.
[in]	NumBytes	On input, indicates the requested read size. On output, indicates the actual number of bytes read
[in]	Buffer	Pointer to the buffer to read into.

Definition at line 150 of file QemuFlash.c.

QemuFlashWrite()

EFI_STATUS QemuFlashWrite	(	IN EFI_LBA	Lba,
		IN UINTN	Offset,
		IN UINTN *	NumBytes,
		IN UINT8 *	Buffer
	)

Write to QEMU Flash

Parameters

[in]	Lba	The starting logical block index to write to.
[in]	Offset	Offset into the block at which to begin writing.
[in]	NumBytes	On input, indicates the requested write size. On output, indicates the actual number of bytes written
[in]	Buffer	Pointer to the data to write.

Definition at line 188 of file QemuFlash.c.

Variable Documentation

mFdBlockCount

STATIC UINTN mFdBlockCount = 0

Definition at line 30 of file QemuFlash.c.

mFdBlockSize

STATIC UINTN mFdBlockSize = 0

Definition at line 29 of file QemuFlash.c.

mFlashBase

UINT8* mFlashBase

Definition at line 27 of file QemuFlash.c.