Csr.c File Reference

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Functions
UINTN	AsmCsrRead (IN UINT16 Select)
UINTN	AsmCsrWrite (IN UINT16 Select, IN UINTN Value)
UINTN	AsmCsrXChg (IN UINT16 Select, IN UINTN Value, IN UINTN Mask)
UINTN EFIAPI	CsrRead (IN UINT16 Select)
UINTN EFIAPI	CsrWrite (IN UINT16 Select, IN OUT UINTN Value)
UINTN EFIAPI	CsrXChg (IN UINT16 Select, IN OUT UINTN Value, IN UINTN Mask)

Detailed Description

LoongArch CSR operation functions.

Copyright (c) 2024, Loongson Technology Corporation Limited. All rights reserved.

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

Definition in file Csr.c.

Function Documentation

CsrRead()

UINTN EFIAPI CsrRead

(

IN UINT16

Select

)

CSR read operation.

Parameters

[in]

Select

CSR read instruction select values.

Returns

The return value of csrrd instruction, if a break exception is triggered, the Select is out of support.

Definition at line 37 of file Csr.c.

CsrWrite()

UINTN EFIAPI CsrWrite	(	IN UINT16	Select,
		IN OUT UINTN	Value
	)

CSR write operation.

Parameters

[in]	Select	CSR write instruction select values.
[in,out]	Value	The csrwr will write the value.

Returns

The return value of csrwr instruction, that is, store the old value of the register, if a break exception is triggered, the Select is out of support.

Definition at line 55 of file Csr.c.

CsrXChg()

UINTN EFIAPI CsrXChg	(	IN UINT16	Select,
		IN OUT UINTN	Value,
		IN UINTN	Mask
	)

CSR exchange operation.

Parameters

[in]	Select	CSR exchange instruction select values.
[in,out]	Value	The csrxchg will write the value.
[in]	Mask	The csrxchg mask value.

Returns

The return value of csrxchg instruction, that is, store the old value of the register, if a break exception is triggered, the Select is out of support.

Definition at line 75 of file Csr.c.