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OvmfPkg: introduce PcdCsmEnable feature flag

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In the DXE phase and later, it is possible for a module to dynamically
determine whether a CSM is enabled. An example can be seen in commit
855743f717 ("OvmfPkg: prevent 64-bit MMIO BAR degradation if there is no
CSM", 2016-05-25).

SEC and PEI phase modules cannot check the Legacy BIOS Protocol however.
For their sake, introduce a new feature PCD that simply reflects the
CSM_ENABLE build flag.

Cc: Anthony Perard <anthony.perard@citrix.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Julien Grall <julien@xen.org>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1512
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20200129214412.2361-11-lersek@redhat.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
This commit is contained in:
Laszlo Ersek
2020-01-29 19:53:18 +01:00
committed by mergify[bot]
parent 9108fc17b0
commit 50f911d25d
5 changed files with 17 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
OvmfPkg/OvmfPkg.dec
View File

@ -276,3 +276,8 @@
# runtime OS from tampering with firmware structures (special memory ranges
# used by OVMF, the varstore pflash chip, LockBox etc).
gUefiOvmfPkgTokenSpaceGuid.PcdSmmSmramRequire|FALSE|BOOLEAN|0x1e
## Informs modules (including pre-DXE-phase modules) whether the platform
# firmware contains a CSM (Compatibility Support Module).
#
gUefiOvmfPkgTokenSpaceGuid.PcdCsmEnable|FALSE|BOOLEAN|0x35

3
OvmfPkg/OvmfPkgIa32.dsc
View File

@ -428,6 +428,9 @@
gEfiMdeModulePkgTokenSpaceGuid.PcdConOutGopSupport|TRUE
gEfiMdeModulePkgTokenSpaceGuid.PcdConOutUgaSupport|FALSE
gEfiMdeModulePkgTokenSpaceGuid.PcdInstallAcpiSdtProtocol|TRUE
!ifdef $(CSM_ENABLE)
gUefiOvmfPkgTokenSpaceGuid.PcdCsmEnable|TRUE
!endif
!if $(SMM_REQUIRE) == TRUE
gUefiOvmfPkgTokenSpaceGuid.PcdSmmSmramRequire|TRUE
gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmEnableBspElection|FALSE

3
OvmfPkg/OvmfPkgIa32X64.dsc
View File

@ -433,6 +433,9 @@
gEfiMdeModulePkgTokenSpaceGuid.PcdConOutGopSupport|TRUE
gEfiMdeModulePkgTokenSpaceGuid.PcdConOutUgaSupport|FALSE
gEfiMdeModulePkgTokenSpaceGuid.PcdInstallAcpiSdtProtocol|TRUE
!ifdef $(CSM_ENABLE)
gUefiOvmfPkgTokenSpaceGuid.PcdCsmEnable|TRUE
!endif
!if $(SMM_REQUIRE) == TRUE
gUefiOvmfPkgTokenSpaceGuid.PcdSmmSmramRequire|TRUE
gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmEnableBspElection|FALSE

3
OvmfPkg/OvmfPkgX64.dsc
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@ -433,6 +433,9 @@
gEfiMdeModulePkgTokenSpaceGuid.PcdConOutGopSupport|TRUE
gEfiMdeModulePkgTokenSpaceGuid.PcdConOutUgaSupport|FALSE
gEfiMdeModulePkgTokenSpaceGuid.PcdInstallAcpiSdtProtocol|TRUE
!ifdef $(CSM_ENABLE)
gUefiOvmfPkgTokenSpaceGuid.PcdCsmEnable|TRUE
!endif
!if $(SMM_REQUIRE) == TRUE
gUefiOvmfPkgTokenSpaceGuid.PcdSmmSmramRequire|TRUE
gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmEnableBspElection|FALSE

3
OvmfPkg/OvmfXen.dsc
View File

@ -361,6 +361,9 @@
gEfiMdeModulePkgTokenSpaceGuid.PcdConOutGopSupport|TRUE
gEfiMdeModulePkgTokenSpaceGuid.PcdConOutUgaSupport|FALSE
gEfiMdeModulePkgTokenSpaceGuid.PcdInstallAcpiSdtProtocol|TRUE
!ifdef $(CSM_ENABLE)
gUefiOvmfPkgTokenSpaceGuid.PcdCsmEnable|TRUE
!endif
[PcdsFixedAtBuild]
gEfiMdeModulePkgTokenSpaceGuid.PcdStatusCodeMemorySize|1