0565a8e885
Add CsrRead, CsrWrite and CsrXChg functions for LoongArch, and use them to operate the CSR register of LoongArch architecture. BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4584 Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Liming Gao <gaoliming@byosoft.com.cn> Cc: Zhiguang Liu <zhiguang.liu@intel.com> Signed-off-by: Chao Li <lichao@loongson.cn> Co-authored-by: Bibo Mao <maobibo@loongson.cn> Acked-by: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
82 lines
1.6 KiB
C
82 lines
1.6 KiB
C
/** @file
|
|
LoongArch CSR operation functions.
|
|
|
|
Copyright (c) 2024, Loongson Technology Corporation Limited. All rights reserved.<BR>
|
|
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
**/
|
|
|
|
UINTN
|
|
AsmCsrRead (
|
|
IN UINT16 Select
|
|
);
|
|
|
|
UINTN
|
|
AsmCsrWrite (
|
|
IN UINT16 Select,
|
|
IN UINTN Value
|
|
);
|
|
|
|
UINTN
|
|
AsmCsrXChg (
|
|
IN UINT16 Select,
|
|
IN UINTN Value,
|
|
IN UINTN Mask
|
|
);
|
|
|
|
/**
|
|
CSR read operation.
|
|
|
|
@param[in] Select CSR read instruction select values.
|
|
|
|
@return The return value of csrrd instruction, return -1 means Select is out of support.
|
|
**/
|
|
UINTN
|
|
EFIAPI
|
|
CsrRead (
|
|
IN UINT16 Select
|
|
)
|
|
{
|
|
return AsmCsrRead (Select);
|
|
}
|
|
|
|
/**
|
|
CSR write operation.
|
|
|
|
@param[in] Select CSR write instruction select values.
|
|
@param[in, out] Value The csrwr will write the value.
|
|
|
|
@return The return value of csrwr instruction, that is, store the old value of
|
|
the register, return -1 means Select is out of support.
|
|
**/
|
|
UINTN
|
|
EFIAPI
|
|
CsrWrite (
|
|
IN UINT16 Select,
|
|
IN OUT UINTN Value
|
|
)
|
|
{
|
|
return AsmCsrWrite (Select, Value);
|
|
}
|
|
|
|
/**
|
|
CSR exchange operation.
|
|
|
|
@param[in] Select CSR exchange instruction select values.
|
|
@param[in, out] Value The csrxchg will write the value.
|
|
@param[in] Mask The csrxchg mask value.
|
|
|
|
@return The return value of csrxchg instruction, that is, store the old value of
|
|
the register, return -1 means Select is out of support.
|
|
**/
|
|
UINTN
|
|
EFIAPI
|
|
CsrXChg (
|
|
IN UINT16 Select,
|
|
IN OUT UINTN Value,
|
|
IN UINTN Mask
|
|
)
|
|
{
|
|
return AsmCsrXChg (Select, Value, Mask);
|
|
}
|