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| author | Ard Biesheuvel <ardb@kernel.org> | 2022-08-15 10:47:51 +0200 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2022-09-10 08:23:27 +0000 |
| commit | 477b5b7d55783f930a7741f4187ccd4f227ebc86 (patch) | |
| tree | 6b9178d4a7623c1839cabfd63b0407f3404ee288 /OvmfPkg/OvmfPkg.dec | |
| parent | 34969dd260b4ecaba8d4a58d32fc07bd0fee57f9 (diff) | |
| download | edk2-477b5b7d55783f930a7741f4187ccd4f227ebc86.tar.gz edk2-477b5b7d55783f930a7741f4187ccd4f227ebc86.tar.bz2 edk2-477b5b7d55783f930a7741f4187ccd4f227ebc86.zip | |
OvmfPkg: Introduce alternate UefiDriverEntrypoint to inhibit driver load
Add a new library that can be incorporated into any driver built from
source, and which permits loading of the driver to be inhibited based on
the value of a QEMU fw_cfg boolean variable. This will be used in a
subsequent patch to allow dispatch of the IPv4 and IPv6 network protocol
driver to be controlled from the QEMU command line.
This approach is based on the notion that all UEFI and DXE drivers share
a single UefiDriverEntryPoint implementation, which we can easily swap
out at build time with one that will abort execution based on the value
of some QEMU fw_cfg variable.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Diffstat (limited to 'OvmfPkg/OvmfPkg.dec')
| -rw-r--r-- | OvmfPkg/OvmfPkg.dec | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/OvmfPkg/OvmfPkg.dec b/OvmfPkg/OvmfPkg.dec index 6b1296b15a..6d689ecc5d 100644 --- a/OvmfPkg/OvmfPkg.dec +++ b/OvmfPkg/OvmfPkg.dec @@ -400,6 +400,10 @@ ## The Tdx accept page size. 0x1000(4k),0x200000(2M)
gUefiOvmfPkgTokenSpaceGuid.PcdTdxAcceptPageSize|0x200000|UINT32|0x65
+ ## The QEMU fw_cfg variable that UefiDriverEntryPointFwCfgOverrideLib will
+ # check to decide whether to abort dispatch of the driver it is linked into.
+ gUefiOvmfPkgTokenSpaceGuid.PcdEntryPointOverrideFwCfgVarName|""|VOID*|0x68
+
[PcdsDynamic, PcdsDynamicEx]
gUefiOvmfPkgTokenSpaceGuid.PcdEmuVariableEvent|0|UINT64|2
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFlashVariablesEnable|FALSE|BOOLEAN|0x10
|