PchSpi.c File Reference

#include "SpiCommon.h"

Go to the source code of this file.

Functions
UINT32	AcquireSpiBar0 (IN UINTN PchSpiBase)
VOID	ReleaseSpiBar0 (IN UINTN PchSpiBase)
VOID	CpuSmmDisableBiosWriteProtect (IN BOOLEAN EnableSmmSts)
EFI_STATUS EFIAPI	DisableBiosWriteProtect (IN UINTN PchSpiBase, IN UINT8 CpuSmmBwp)
VOID EFIAPI	EnableBiosWriteProtect (IN UINTN PchSpiBase, IN UINT8 CpuSmmBwp)
UINT8	SaveAndDisableSpiPrefetchCache (IN UINTN PchSpiBase)
VOID	SetSpiBiosControlRegister (IN UINTN PchSpiBase, IN UINT8 BiosCtlValue)

Detailed Description

Copyright (c) 2017-2021, Intel Corporation. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent

Definition in file PchSpi.c.

Function Documentation

AcquireSpiBar0()

UINT32 AcquireSpiBar0

(

IN UINTN

PchSpiBase

)

Acquire SPI MMIO BAR.

Parameters

[in]

PchSpiBase

PCH SPI PCI Base Address

Return values

Return

SPI BAR Address

Definition at line 18 of file PchSpi.c.

CpuSmmDisableBiosWriteProtect()

VOID CpuSmmDisableBiosWriteProtect

(

IN BOOLEAN

EnableSmmSts

)

This function is to enable/disable BIOS Write Protect in SMM phase.

Parameters

[in]

EnableSmmSts

Flag to Enable/disable Bios write protect

Definition at line 45 of file PchSpi.c.

DisableBiosWriteProtect()

EFI_STATUS EFIAPI DisableBiosWriteProtect	(	IN UINTN	PchSpiBase,
		IN UINT8	CpuSmmBwp
	)

This function is a hook for Spi to disable BIOS Write Protect.

Parameters

[in]	PchSpiBase	PCH SPI PCI Base Address
[in]	CpuSmmBwp	Need to disable CPU SMM Bios write protection or not

Return values

EFI_SUCCESS	The protocol instance was properly initialized
EFI_ACCESS_DENIED	The BIOS Region can only be updated in SMM phase

Definition at line 83 of file PchSpi.c.

EnableBiosWriteProtect()

VOID EFIAPI EnableBiosWriteProtect	(	IN UINTN	PchSpiBase,
		IN UINT8	CpuSmmBwp
	)

This function is a hook for Spi to enable BIOS Write Protect.

Parameters

[in]	PchSpiBase	PCH SPI PCI Base Address
[in]	CpuSmmBwp	Need to disable CPU SMM Bios write protection or not

Definition at line 114 of file PchSpi.c.

ReleaseSpiBar0()

VOID ReleaseSpiBar0

(

IN UINTN

PchSpiBase

)

Release SPI MMIO BAR. Do nothing.

Parameters

[in]

PchSpiBase

PCH SPI PCI Base Address

Definition at line 32 of file PchSpi.c.

SaveAndDisableSpiPrefetchCache()

UINT8 SaveAndDisableSpiPrefetchCache

(

IN UINTN

PchSpiBase

)

This function disables SPI Prefetching and caching, and returns previous BIOS Control Register value before disabling.

Parameters

[in]

PchSpiBase

PCH SPI PCI Base Address

Return values

Previous

BIOS Control Register value

Definition at line 139 of file PchSpi.c.

SetSpiBiosControlRegister()

VOID SetSpiBiosControlRegister	(	IN UINTN	PchSpiBase,
		IN UINT8	BiosCtlValue
	)

This function updates BIOS Control Register with the given value.

Parameters

[in]	PchSpiBase	PCH SPI PCI Base Address
[in]	BiosCtlValue	BIOS Control Register Value to be updated

Definition at line 164 of file PchSpi.c.