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REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4812 When the Select is out of support, use method break exception instead of method return -1, avoid unknown errors caused by untimely detection. Cc: Chao Li <lichao@loongson.cn> Signed-off-by: Dongyan Qian <qiandongyan@loongson.cn>
83 lines
1.7 KiB
C
83 lines
1.7 KiB
C
/** @file
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LoongArch CSR operation functions.
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Copyright (c) 2024, Loongson Technology Corporation Limited. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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UINTN
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AsmCsrRead (
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IN UINT16 Select
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);
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UINTN
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AsmCsrWrite (
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IN UINT16 Select,
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IN UINTN Value
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);
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UINTN
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AsmCsrXChg (
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IN UINT16 Select,
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IN UINTN Value,
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IN UINTN Mask
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);
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/**
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CSR read operation.
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@param[in] Select CSR read instruction select values.
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@return The return value of csrrd instruction,
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if a break exception is triggered, the Select is out of support.
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**/
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UINTN
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EFIAPI
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CsrRead (
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IN UINT16 Select
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)
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{
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return AsmCsrRead (Select);
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}
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/**
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CSR write operation.
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@param[in] Select CSR write instruction select values.
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@param[in, out] Value The csrwr will write the value.
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@return The return value of csrwr instruction, that is, store the old value of
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the register, if a break exception is triggered, the Select is out of support.
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**/
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UINTN
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EFIAPI
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CsrWrite (
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IN UINT16 Select,
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IN OUT UINTN Value
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)
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{
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return AsmCsrWrite (Select, Value);
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}
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/**
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CSR exchange operation.
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@param[in] Select CSR exchange instruction select values.
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@param[in, out] Value The csrxchg will write the value.
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@param[in] Mask The csrxchg mask value.
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@return The return value of csrxchg instruction, that is, store the old value of
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the register, if a break exception is triggered, the Select is out of support.
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**/
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UINTN
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EFIAPI
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CsrXChg (
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IN UINT16 Select,
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IN OUT UINTN Value,
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IN UINTN Mask
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)
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{
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return AsmCsrXChg (Select, Value, Mask);
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}
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