Re: [edk2-devel] [PATCH] UefiCpuPkg: RISC-V: MMU: Introduce a PCD for SATP mode

["Sunil V L" <sunilvl@ventanamicro.com>]

Hi Tuan,

Thanks for the patch!. Adding UefiCpuPkg maintainers.

On Tue, Oct 03, 2023 at 02:00:21PM -0700, Tuan Phan wrote:
> Introduce a PCD to control the maximum SATP mode that MMU allowed
> to use. This PCD helps RISC-V platform set bare or minimum SATA mode

SATA -> SATP

> during bring up to debug memory map issue.
> 
> Signed-off-by: Tuan Phan <tphan@ventanamicro.com>
> ---
>  UefiCpuPkg/Library/BaseRiscVMmuLib/BaseRiscVMmuLib.c   | 6 +++++-
>  UefiCpuPkg/Library/BaseRiscVMmuLib/BaseRiscVMmuLib.inf | 3 +++
>  UefiCpuPkg/UefiCpuPkg.dec                              | 8 ++++++++
>  3 files changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/UefiCpuPkg/Library/BaseRiscVMmuLib/BaseRiscVMmuLib.c b/UefiCpuPkg/Library/BaseRiscVMmuLib/BaseRiscVMmuLib.c
> index 9cca5fc128af..826a1d32a1d4 100644
> --- a/UefiCpuPkg/Library/BaseRiscVMmuLib/BaseRiscVMmuLib.c
> +++ b/UefiCpuPkg/Library/BaseRiscVMmuLib/BaseRiscVMmuLib.c
> @@ -36,7 +36,7 @@
>  #define PTE_PPN_SHIFT         10
>  #define RISCV_MMU_PAGE_SHIFT  12
>  
> -STATIC UINTN  mModeSupport[] = { SATP_MODE_SV57, SATP_MODE_SV48, SATP_MODE_SV39 };
> +STATIC UINTN  mModeSupport[] = { SATP_MODE_SV57, SATP_MODE_SV48, SATP_MODE_SV39, SATP_MODE_OFF };
>  STATIC UINTN  mMaxRootTableLevel;
>  STATIC UINTN  mBitPerLevel;
>  STATIC UINTN  mTableEntryCount;
> @@ -590,6 +590,10 @@ RiscVMmuSetSatpMode  (
>    UINTN                            Index;
>    EFI_STATUS                       Status;
>  
> +  if (SatpMode > PcdGet32 (PcdCpuRiscVMmuMaxSatpMode)) {
> +    return EFI_DEVICE_ERROR;
> +  }
> +
>    switch (SatpMode) {
>      case SATP_MODE_OFF:
>        return EFI_SUCCESS;
> diff --git a/UefiCpuPkg/Library/BaseRiscVMmuLib/BaseRiscVMmuLib.inf b/UefiCpuPkg/Library/BaseRiscVMmuLib/BaseRiscVMmuLib.inf
> index 9b28a98cb346..51ebe1750e97 100644
> --- a/UefiCpuPkg/Library/BaseRiscVMmuLib/BaseRiscVMmuLib.inf
> +++ b/UefiCpuPkg/Library/BaseRiscVMmuLib/BaseRiscVMmuLib.inf
> @@ -25,3 +25,6 @@
>  
>  [LibraryClasses]
>    BaseLib
> +
> +[Pcd]
> +  gUefiCpuPkgTokenSpaceGuid.PcdCpuRiscVMmuMaxSatpMode  ## CONSUMES
> diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec
> index 68473fc640e6..79191af18a05 100644
> --- a/UefiCpuPkg/UefiCpuPkg.dec
> +++ b/UefiCpuPkg/UefiCpuPkg.dec
> @@ -396,6 +396,14 @@
>    # @Prompt Access to non-SMRAM memory is restricted to reserved, runtime and ACPI NVS type after SmmReadyToLock.
>    gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmRestrictedMemoryAccess|TRUE|BOOLEAN|0x3213210F
>  
> +[PcdsFixedAtBuild.RISCV64]
> +  ## Indicate the maximum SATP mode allowed.
> +  #  0 - Bare mode.
> +  #  8 - 39bit mode.
> +  #  9 - 48bit mode.
> +  #  10 - 57bit mode.
> +  gUefiCpuPkgTokenSpaceGuid.PcdCpuRiscVMmuMaxSatpMode|0|UINT32|0x60000021
> +
Shouldn't the default value be 10?

Thanks,
Sunil

>  [PcdsDynamic, PcdsDynamicEx]
>    ## Contains the pointer to a CPU S3 data buffer of structure ACPI_CPU_DATA.
>    # @Prompt The pointer to a CPU S3 data buffer.
> -- 
> 2.25.1
> 


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