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| author | Chao Li <lichao@loongson.cn> | 2023-10-16 11:43:40 +0800 |
|---|---|---|
| committer | Liming Gao <gaoliming@byosoft.com.cn> | 2024-02-06 23:51:47 +0800 |
| commit | 0565a8e885e48ca4bea95f47dad04d3d9968b447 (patch) | |
| tree | a704c92f8debf0bc6fb7bfe81239e0ef05ac3312 /MdePkg/Library/BaseLib/LoongArch64/Csr.c | |
| parent | 414ad233a51192662ed66ceee7a23007c6710ec9 (diff) | |
| download | edk2-0565a8e885e48ca4bea95f47dad04d3d9968b447.tar.gz edk2-0565a8e885e48ca4bea95f47dad04d3d9968b447.tar.bz2 edk2-0565a8e885e48ca4bea95f47dad04d3d9968b447.zip | |
MdePkg: Add CSR operation for LoongArch
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>
Diffstat (limited to 'MdePkg/Library/BaseLib/LoongArch64/Csr.c')
| -rw-r--r-- | MdePkg/Library/BaseLib/LoongArch64/Csr.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/LoongArch64/Csr.c b/MdePkg/Library/BaseLib/LoongArch64/Csr.c new file mode 100644 index 0000000000..f2ec80b38d --- /dev/null +++ b/MdePkg/Library/BaseLib/LoongArch64/Csr.c @@ -0,0 +1,81 @@ +/** @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);
+}
|