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| author | Gerd Hoffmann <kraxel@redhat.com> | 2022-07-19 17:12:48 +0200 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2022-09-06 16:55:33 +0000 |
| commit | 5eeb088ad64124229b32a5593fada578b935e207 (patch) | |
| tree | f58e93ffd1eb3120e04e70da64cd66a20497f306 /OvmfPkg/Library/QemuBootOrderLib | |
| parent | db463e8e9da6f19becb336645dad3718de0743d3 (diff) | |
| download | edk2-5eeb088ad64124229b32a5593fada578b935e207.tar.gz edk2-5eeb088ad64124229b32a5593fada578b935e207.tar.bz2 edk2-5eeb088ad64124229b32a5593fada578b935e207.zip | |
OvmfPkg/QemuBootOrderLib: add StoreQemuBootOrder()
The function reads the boot order from qemu fw_cfg, translates it into
device paths and stores them in 'QemuBootOrderNNNN' variables. In case
there is no boot ordering configured the function will do nothing.
Use case: Allow applications loaded via 'qemu -kernel bootloader.efi'
obey the boot order.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Diffstat (limited to 'OvmfPkg/Library/QemuBootOrderLib')
| -rw-r--r-- | OvmfPkg/Library/QemuBootOrderLib/QemuBootOrderLib.c | 122 | ||||
| -rw-r--r-- | OvmfPkg/Library/QemuBootOrderLib/QemuBootOrderLib.inf | 1 |
2 files changed, 123 insertions, 0 deletions
diff --git a/OvmfPkg/Library/QemuBootOrderLib/QemuBootOrderLib.c b/OvmfPkg/Library/QemuBootOrderLib/QemuBootOrderLib.c index 67d29ac642..398de7fab4 100644 --- a/OvmfPkg/Library/QemuBootOrderLib/QemuBootOrderLib.c +++ b/OvmfPkg/Library/QemuBootOrderLib/QemuBootOrderLib.c @@ -1687,6 +1687,128 @@ FreeFwCfg: }
/**
+ Write qemu boot order to uefi variables.
+
+ Attempt to retrieve the "bootorder" fw_cfg file from QEMU. Translate
+ the OpenFirmware device paths therein to UEFI device path fragments.
+
+ On Success store the device path in QemuBootOrderNNNN variables.
+**/
+VOID
+EFIAPI
+StoreQemuBootOrder (
+ VOID
+ )
+{
+ RETURN_STATUS Status;
+ FIRMWARE_CONFIG_ITEM FwCfgItem;
+ UINTN FwCfgSize;
+ CHAR8 *FwCfg;
+ EFI_STATUS EfiStatus;
+ EXTRA_ROOT_BUS_MAP *ExtraPciRoots;
+ CONST CHAR8 *FwCfgPtr;
+ UINTN TranslatedSize;
+ CHAR16 Translated[TRANSLATION_OUTPUT_SIZE];
+ UINTN VariableIndex = 0;
+ CHAR16 VariableName[20];
+
+ Status = QemuFwCfgFindFile ("bootorder", &FwCfgItem, &FwCfgSize);
+ if (RETURN_ERROR (Status)) {
+ return;
+ }
+
+ if (FwCfgSize == 0) {
+ return;
+ }
+
+ FwCfg = AllocatePool (FwCfgSize);
+ if (FwCfg == NULL) {
+ return;
+ }
+
+ QemuFwCfgSelectItem (FwCfgItem);
+ QemuFwCfgReadBytes (FwCfgSize, FwCfg);
+ if (FwCfg[FwCfgSize - 1] != '\0') {
+ Status = RETURN_INVALID_PARAMETER;
+ goto FreeFwCfg;
+ }
+
+ DEBUG ((DEBUG_VERBOSE, "%a: FwCfg:\n", __FUNCTION__));
+ DEBUG ((DEBUG_VERBOSE, "%a\n", FwCfg));
+ DEBUG ((DEBUG_VERBOSE, "%a: FwCfg: <end>\n", __FUNCTION__));
+
+ if (FeaturePcdGet (PcdQemuBootOrderPciTranslation)) {
+ EfiStatus = CreateExtraRootBusMap (&ExtraPciRoots);
+ if (EFI_ERROR (EfiStatus)) {
+ Status = (RETURN_STATUS)EfiStatus;
+ goto FreeFwCfg;
+ }
+ } else {
+ ExtraPciRoots = NULL;
+ }
+
+ //
+ // Translate each OpenFirmware path to a UEFI devpath prefix.
+ //
+ FwCfgPtr = FwCfg;
+ TranslatedSize = ARRAY_SIZE (Translated);
+ Status = TranslateOfwPath (
+ &FwCfgPtr,
+ ExtraPciRoots,
+ Translated,
+ &TranslatedSize
+ );
+ while (!RETURN_ERROR (Status)) {
+ EFI_DEVICE_PATH_PROTOCOL *DevicePath;
+
+ //
+ // Convert the UEFI devpath prefix to binary representation.
+ //
+ ASSERT (Translated[TranslatedSize] == L'\0');
+ DevicePath = ConvertTextToDevicePath (Translated);
+ if (DevicePath == NULL) {
+ Status = RETURN_OUT_OF_RESOURCES;
+ goto FreeExtraPciRoots;
+ }
+
+ UnicodeSPrint (
+ VariableName,
+ sizeof (VariableName),
+ L"QemuBootOrder%04d",
+ VariableIndex++
+ );
+ DEBUG ((DEBUG_INFO, "%a: %s = %s\n", __FUNCTION__, VariableName, Translated));
+ gRT->SetVariable (
+ VariableName,
+ &gQemuBootOrderGuid,
+ EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
+ GetDevicePathSize (DevicePath),
+ DevicePath
+ );
+ FreePool (DevicePath);
+
+ //
+ // Move to the next OFW devpath.
+ //
+ TranslatedSize = ARRAY_SIZE (Translated);
+ Status = TranslateOfwPath (
+ &FwCfgPtr,
+ ExtraPciRoots,
+ Translated,
+ &TranslatedSize
+ );
+ }
+
+FreeExtraPciRoots:
+ if (ExtraPciRoots != NULL) {
+ DestroyExtraRootBusMap (ExtraPciRoots);
+ }
+
+FreeFwCfg:
+ FreePool (FwCfg);
+}
+
+/**
Convert the UEFI DevicePath to full text representation with DevPathToText,
then match the UEFI device path fragment in Translated against it.
diff --git a/OvmfPkg/Library/QemuBootOrderLib/QemuBootOrderLib.inf b/OvmfPkg/Library/QemuBootOrderLib/QemuBootOrderLib.inf index 7c02f04e70..211344fb0b 100644 --- a/OvmfPkg/Library/QemuBootOrderLib/QemuBootOrderLib.inf +++ b/OvmfPkg/Library/QemuBootOrderLib/QemuBootOrderLib.inf @@ -49,6 +49,7 @@ [Guids]
gEfiGlobalVariableGuid
gVirtioMmioTransportGuid
+ gQemuBootOrderGuid
[FeaturePcd]
gUefiOvmfPkgTokenSpaceGuid.PcdQemuBootOrderPciTranslation
|