Re: [edk2-devel] [PATCH v2 03/30] MdePkg: Add LoongArch64 exception function set into BaseLib

["Michael D Kinney" <michael.d.kinney@intel.com>]

Acked-by: Michael D Kinney <michael.d.kinney@intel.com>

> -----Original Message-----
> From: Chao Li <lichao@loongson.cn>
> Sent: Sunday, November 5, 2023 7:27 PM
> To: devel@edk2.groups.io
> Cc: Kinney, Michael D <michael.d.kinney@intel.com>; Gao, Liming
> <gaoliming@byosoft.com.cn>; Liu, Zhiguang <zhiguang.liu@intel.com>
> Subject: [PATCH v2 03/30] MdePkg: Add LoongArch64 exception function
> set into BaseLib
> 
> Adding SetExceptionBaseAddress and SetTlbRebaseAddress functions
> for LoongArch64.
> 
> 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>
> ---
>  MdePkg/Include/Library/BaseLib.h              | 20 +++++++++
>  MdePkg/Library/BaseLib/BaseLib.inf            |  1 +
>  .../BaseLib/LoongArch64/ExceptionBase.S       | 41
> +++++++++++++++++++
>  3 files changed, 62 insertions(+)
>  create mode 100644 MdePkg/Library/BaseLib/LoongArch64/ExceptionBase.S
> 
> diff --git a/MdePkg/Include/Library/BaseLib.h
> b/MdePkg/Include/Library/BaseLib.h
> index 5d7067ee85..a9a69c734c 100644
> --- a/MdePkg/Include/Library/BaseLib.h
> +++ b/MdePkg/Include/Library/BaseLib.h
> @@ -229,6 +229,26 @@ typedef struct {
> 
>  #define BASE_LIBRARY_JUMP_BUFFER_ALIGNMENT  8
> 
> +/*
> + * Set the exception base address for LoongArch.
> + *
> + * @param  ExceptionBaseAddress   The exception base address, must be
> aligned greater than or qeual to 4K .
> + */
> +VOID
> +SetExceptionBaseAddress (
> +  IN UINT64
> +  );
> +
> +/*
> + * Set the TlbRebase address for LoongArch.
> + *
> + * @param  TlbRebaseAddress   The TlbRebase address, must be aligned
> greater than or qeual to 4K .
> + */
> +VOID
> +SetTlbRebaseAddress (
> +  IN UINT64
> +  );
> +
>  #endif // defined (MDE_CPU_LOONGARCH64)
> 
>  //
> diff --git a/MdePkg/Library/BaseLib/BaseLib.inf
> b/MdePkg/Library/BaseLib/BaseLib.inf
> index 03c7b02e82..a18fe5efb4 100644
> --- a/MdePkg/Library/BaseLib/BaseLib.inf
> +++ b/MdePkg/Library/BaseLib/BaseLib.inf
> @@ -419,6 +419,7 @@
>    LoongArch64/CpuPause.S            | GCC
>    LoongArch64/SetJumpLongJump.S     | GCC
>    LoongArch64/SwitchStack.S         | GCC
> +  LoongArch64/ExceptionBase.S       | GCC
> 
>  [Packages]
>    MdePkg/MdePkg.dec
> diff --git a/MdePkg/Library/BaseLib/LoongArch64/ExceptionBase.S
> b/MdePkg/Library/BaseLib/LoongArch64/ExceptionBase.S
> new file mode 100644
> index 0000000000..36c6ca7ca8
> --- /dev/null
> +++ b/MdePkg/Library/BaseLib/LoongArch64/ExceptionBase.S
> @@ -0,0 +1,41 @@
> +#--------------------------------------------------------------------
> ----------
> +#
> +# LoongArch set exception base address operations
> +#
> +# Copyright (c) 2023, Loongson Technology Corporation Limited. All
> rights reserved.<BR>
> +#
> +# SPDX-License-Identifier: BSD-2-Clause-Patent
> +#
> +#--------------------------------------------------------------------
> ----------
> +
> +#include <Base.h>
> +#include <Register/LoongArch64/Csr.h>
> +
> +ASM_GLOBAL ASM_PFX(SetExceptionBaseAddress)
> +ASM_GLOBAL ASM_PFX(SetTlbRebaseAddress)
> +
> +#/**
> +#  Set the exception base address for LoongArch.
> +#
> +#  @param  ExceptionBaseAddress   The exception base address, must be
> aligned greater than or qeual to 4K .
> +#**/
> +ASM_PFX(SetExceptionBaseAddress):
> +  csrrd   $t0, LOONGARCH_CSR_ECFG
> +  li.d    $t1, ~(BIT16 | BIT17 | BIT18)
> +  and     $t0, $t0, $t1
> +  csrwr   $t0, LOONGARCH_CSR_ECFG
> +
> +  move    $t0, $a0
> +  csrwr   $t0, LOONGARCH_CSR_EBASE
> +  jirl    $zero, $ra, 0
> +
> +#/**
> +#  Set the TlbRebase address for LoongArch.
> +#
> +#  @param  TlbRebaseAddress   The TlbRebase address, must be aligned
> greater than or qeual to 4K .
> +#**/
> +ASM_PFX(SetTlbRebaseAddress):
> +  move    $t0, $a0
> +  csrwr   $t0, LOONGARCH_CSR_TLBREBASE
> +  jirl    $zero, $ra, 0
> +.end
> --
> 2.27.0



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