diff options
Diffstat (limited to 'OvmfPkg/AcpiPlatformDxe/Qemu.c')
| -rw-r--r-- | OvmfPkg/AcpiPlatformDxe/Qemu.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/OvmfPkg/AcpiPlatformDxe/Qemu.c b/OvmfPkg/AcpiPlatformDxe/Qemu.c index 06bd46370e..e62467a5bc 100644 --- a/OvmfPkg/AcpiPlatformDxe/Qemu.c +++ b/OvmfPkg/AcpiPlatformDxe/Qemu.c @@ -515,3 +515,156 @@ QemuInstallAcpiTable ( );
}
+
+/**
+ Download the ACPI table data file from QEMU and interpret it.
+
+ @param[in] AcpiProtocol The ACPI table protocol used to install tables.
+
+ @retval EFI_UNSUPPORTED Firmware configuration is unavailable.
+
+ @retval EFI_NOT_FOUND The host doesn't export the required fw_cfg
+ files.
+
+ @retval EFI_OUT_OF_RESOURCES Memory allocation failed.
+
+ @retval EFI_PROTOCOL_ERROR Found truncated or invalid ACPI table header
+ in the fw_cfg contents.
+
+ @return Status codes returned by
+ AcpiProtocol->InstallAcpiTable().
+
+**/
+
+//
+// We'll be saving the keys of installed tables so that we can roll them back
+// in case of failure. 128 tables should be enough for anyone (TM).
+//
+#define INSTALLED_TABLES_MAX 128
+
+EFI_STATUS
+EFIAPI
+InstallQemuLinkedTables (
+ IN EFI_ACPI_TABLE_PROTOCOL *AcpiProtocol
+ )
+{
+ EFI_STATUS Status;
+ FIRMWARE_CONFIG_ITEM TablesFile;
+ UINTN TablesFileSize;
+ UINT8 *Tables;
+ UINTN *InstalledKey;
+ UINTN Processed;
+ INT32 Installed;
+
+ Status = QemuFwCfgFindFile ("etc/acpi/tables", &TablesFile, &TablesFileSize);
+ if (EFI_ERROR (Status)) {
+ DEBUG ((EFI_D_INFO, "%a: \"etc/acpi/tables\" interface unavailable: %r\n",
+ __FUNCTION__, Status));
+ return Status;
+ }
+
+ Tables = AllocatePool (TablesFileSize);
+ if (Tables == NULL) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ QemuFwCfgSelectItem (TablesFile);
+ QemuFwCfgReadBytes (TablesFileSize, Tables);
+
+ InstalledKey = AllocatePool (INSTALLED_TABLES_MAX * sizeof *InstalledKey);
+ if (InstalledKey == NULL) {
+ Status = EFI_OUT_OF_RESOURCES;
+ goto FreeTables;
+ }
+
+ Processed = 0;
+ Installed = 0;
+ while (Processed < TablesFileSize) {
+ UINTN Remaining;
+ EFI_ACPI_DESCRIPTION_HEADER *Probe;
+
+ Remaining = TablesFileSize - Processed;
+ if (Remaining < sizeof *Probe) {
+ Status = EFI_PROTOCOL_ERROR;
+ break;
+ }
+
+ Probe = (EFI_ACPI_DESCRIPTION_HEADER *) (Tables + Processed);
+ if (Remaining < Probe->Length || Probe->Length < sizeof *Probe) {
+ Status = EFI_PROTOCOL_ERROR;
+ break;
+ }
+
+ DEBUG ((EFI_D_VERBOSE, "%a: offset 0x%016Lx:"
+ " Signature=\"%-4.4a\" Length=0x%08x\n",
+ __FUNCTION__, (UINT64) Processed,
+ (CONST CHAR8 *) &Probe->Signature, Probe->Length));
+
+ //
+ // skip automatically handled "root" tables: RSDT, XSDT
+ //
+ if (Probe->Signature !=
+ EFI_ACPI_1_0_ROOT_SYSTEM_DESCRIPTION_TABLE_SIGNATURE &&
+ Probe->Signature !=
+ EFI_ACPI_2_0_EXTENDED_SYSTEM_DESCRIPTION_TABLE_SIGNATURE) {
+ if (Installed == INSTALLED_TABLES_MAX) {
+ DEBUG ((EFI_D_ERROR, "%a: can't install more than %d tables\n",
+ __FUNCTION__, INSTALLED_TABLES_MAX));
+ Status = EFI_OUT_OF_RESOURCES;
+ break;
+ }
+
+ Status = AcpiProtocol->InstallAcpiTable (AcpiProtocol, Probe,
+ Probe->Length, &InstalledKey[Installed]);
+ if (EFI_ERROR (Status)) {
+ DEBUG ((EFI_D_ERROR,
+ "%a: failed to install table \"%-4.4a\" at offset 0x%Lx: %r\n",
+ __FUNCTION__, (CONST CHAR8 *) &Probe->Signature, (UINT64) Processed,
+ Status));
+ break;
+ }
+
+ ++Installed;
+ }
+
+ Processed += Probe->Length;
+ }
+
+ //
+ // NUL-padding at the end is accepted
+ //
+ if (Status == EFI_PROTOCOL_ERROR) {
+ UINTN ErrorLocation;
+
+ ErrorLocation = Processed;
+ while (Processed < TablesFileSize && Tables[Processed] == '\0') {
+ ++Processed;
+ }
+ if (Processed < TablesFileSize) {
+ DEBUG ((EFI_D_ERROR, "%a: truncated or invalid ACPI table header at "
+ "offset 0x%Lx\n", __FUNCTION__, (UINT64) ErrorLocation));
+ }
+ }
+
+ if (Processed == TablesFileSize) {
+ DEBUG ((EFI_D_INFO, "%a: installed %d tables\n", __FUNCTION__, Installed));
+ Status = EFI_SUCCESS;
+ } else {
+ ASSERT (EFI_ERROR (Status));
+
+ //
+ // Roll back partial installation.
+ //
+ while (Installed > 0) {
+ --Installed;
+ AcpiProtocol->UninstallAcpiTable (AcpiProtocol, InstalledKey[Installed]);
+ }
+ }
+
+ FreePool (InstalledKey);
+
+FreeTables:
+ FreePool (Tables);
+
+ return Status;
+}
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