Re: [edk2-devel] [edk2-platforms] Platform/Loongson: Pre-allocate 0-4K memory during the Pei phase

[Chao Li]

Reviewed-by: Chao Li <lic...@loongson.cn>


Thanks,
Chao
在 2023/6/1 19:19, xianglai 写道:

When 0 address protection is enabled,
0-4k memory needs to be preallocated to
prevent UEFI applications from allocating use,
such as grub.

Cc: Ard Biesheuvel<ardb+tianoc...@kernel.org>
Cc: Bibo Mao<maob...@loongson.cn>
Cc: Chao Li<lic...@loongson.cn>
Cc: Leif Lindholm<quic_llind...@quicinc.com>
Cc: Liming Gao<gaolim...@byosoft.com.cn>
Cc: Michael D Kinney<michael.d.kin...@intel.com>
Signed-off-by: xianglai li<lixiang...@loongson.cn>
---
  .../LoongArchQemuPkg/PlatformPei/MemDetect.c        | 13 +++++++++++++
  .../LoongArchQemuPkg/PlatformPei/PlatformPei.inf    |  1 +
  2 files changed, 14 insertions(+)

diff --git a/Platform/Loongson/LoongArchQemuPkg/PlatformPei/MemDetect.c 
b/Platform/Loongson/LoongArchQemuPkg/PlatformPei/MemDetect.c
index fad4cff8d8..7e6a4a3aa9 100644
--- a/Platform/Loongson/LoongArchQemuPkg/PlatformPei/MemDetect.c
+++ b/Platform/Loongson/LoongArchQemuPkg/PlatformPei/MemDetect.c
@@ -101,4 +101,17 @@ InitializeRamRegions (

AddMemoryRangeHob ( pEntry->BaseAddr, pEntry->BaseAddr + pEntry->Length);

    }
+
+  //
+  //When 0 address protection is enabled,
+  //0-4k memory needs to be preallocated to prevent UEFI applications from 
allocating use,
+  //such as grub
+  //
+  if (PcdGet8 (PcdNullPointerDetectionPropertyMask) & BIT0) {
+    BuildMemoryAllocationHob (
+          0,
+          EFI_PAGE_SIZE,
+          EfiBootServicesData
+          );
+  }
  }
diff --git a/Platform/Loongson/LoongArchQemuPkg/PlatformPei/PlatformPei.inf 
b/Platform/Loongson/LoongArchQemuPkg/PlatformPei/PlatformPei.inf
index 268efac585..6cc3513b63 100644
--- a/Platform/Loongson/LoongArchQemuPkg/PlatformPei/PlatformPei.inf
+++ b/Platform/Loongson/LoongArchQemuPkg/PlatformPei/PlatformPei.inf
@@ -59,6 +59,7 @@
    gLoongArchQemuPkgTokenSpaceGuid.PcdDeviceTreeBase
    gLoongArchQemuPkgTokenSpaceGuid.PcdDeviceTreePadding
    gLoongArchQemuPkgTokenSpaceGuid.PcdRtcBaseAddress
+  gEfiMdeModulePkgTokenSpaceGuid.PcdNullPointerDetectionPropertyMask

[FixedPcd]

    gLoongArchQemuPkgTokenSpaceGuid.PcdFlashDxeFvBase

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