diff options
Diffstat (limited to 'roms/edk2/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskDriver.c')
| -rw-r--r-- | roms/edk2/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskDriver.c | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/roms/edk2/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskDriver.c b/roms/edk2/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskDriver.c new file mode 100644 index 000000000..fcbf4f117 --- /dev/null +++ b/roms/edk2/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskDriver.c @@ -0,0 +1,244 @@ +/** @file
+ The driver entry point for RamDiskDxe driver.
+
+ Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
+ Copyright (c) Microsoft Corporation.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include "RamDiskImpl.h"
+
+//
+// Handle for the EFI_RAM_DISK_PROTOCOL instance
+//
+EFI_HANDLE mRamDiskHandle = NULL;
+
+//
+// The EFI_RAM_DISK_PROTOCOL instances that is installed onto the driver
+// handle
+//
+EFI_RAM_DISK_PROTOCOL mRamDiskProtocol = {
+ RamDiskRegister,
+ RamDiskUnregister
+};
+
+//
+// RamDiskDxe driver maintains a list of registered RAM disks.
+//
+LIST_ENTRY RegisteredRamDisks;
+
+//
+// Pointers to the EFI_ACPI_TABLE_PROTOCOL and EFI_ACPI_SDT_PROTOCOL.
+//
+EFI_ACPI_TABLE_PROTOCOL *mAcpiTableProtocol = NULL;
+EFI_ACPI_SDT_PROTOCOL *mAcpiSdtProtocol = NULL;
+
+
+/**
+ Check whether EFI_ACPI_TABLE_PROTOCOL and EFI_ACPI_SDT_PROTOCOL are produced.
+ If both protocols are produced, publish all the reserved memory type RAM
+ disks to the NVDIMM Firmware Interface Table (NFIT).
+
+ @param[in] Event Event whose notification function is being invoked.
+ @param[in] Context The pointer to the notification function's context,
+ which is implementation-dependent.
+
+**/
+VOID
+EFIAPI
+RamDiskAcpiCheck (
+ IN EFI_EVENT Event,
+ IN VOID *Context
+ )
+{
+ EFI_STATUS Status;
+ LIST_ENTRY *Entry;
+ RAM_DISK_PRIVATE_DATA *PrivateData;
+
+ gBS->CloseEvent (Event);
+
+ //
+ // Locate the EFI_ACPI_TABLE_PROTOCOL.
+ //
+ Status = gBS->LocateProtocol (
+ &gEfiAcpiTableProtocolGuid,
+ NULL,
+ (VOID **)&mAcpiTableProtocol
+ );
+ if (EFI_ERROR (Status)) {
+ DEBUG ((
+ EFI_D_INFO,
+ "RamDiskAcpiCheck: Cannot locate the EFI ACPI Table Protocol, "
+ "unable to publish RAM disks to NFIT.\n"
+ ));
+ return;
+ }
+
+ //
+ // Locate the EFI_ACPI_SDT_PROTOCOL.
+ //
+ Status = gBS->LocateProtocol (
+ &gEfiAcpiSdtProtocolGuid,
+ NULL,
+ (VOID **)&mAcpiSdtProtocol
+ );
+ if (EFI_ERROR (Status)) {
+ DEBUG ((
+ EFI_D_INFO,
+ "RamDiskAcpiCheck: Cannot locate the EFI ACPI Sdt Protocol, "
+ "unable to publish RAM disks to NFIT.\n"
+ ));
+ mAcpiTableProtocol = NULL;
+ return;
+ }
+
+ BASE_LIST_FOR_EACH (Entry, &RegisteredRamDisks) {
+ PrivateData = RAM_DISK_PRIVATE_FROM_THIS (Entry);
+ RamDiskPublishNfit (PrivateData);
+ }
+}
+
+
+/**
+ The entry point for RamDiskDxe driver.
+
+ @param[in] ImageHandle The image handle of the driver.
+ @param[in] SystemTable The system table.
+
+ @retval EFI_ALREADY_STARTED The driver already exists in system.
+ @retval EFI_OUT_OF_RESOURCES Fail to execute entry point due to lack of
+ resources.
+ @retval EFI_SUCCES All the related protocols are installed on
+ the driver.
+
+**/
+EFI_STATUS
+EFIAPI
+RamDiskDxeEntryPoint (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ EFI_STATUS Status;
+ RAM_DISK_CONFIG_PRIVATE_DATA *ConfigPrivate;
+ VOID *DummyInterface;
+ EFI_EVENT Event;
+
+ //
+ // If already started, return.
+ //
+ Status = gBS->LocateProtocol (
+ &gEfiRamDiskProtocolGuid,
+ NULL,
+ &DummyInterface
+ );
+ if (!EFI_ERROR (Status)) {
+ DEBUG ((EFI_D_INFO, "Driver already started!\n"));
+ return EFI_ALREADY_STARTED;
+ }
+
+ //
+ // Create a private data structure.
+ //
+ ConfigPrivate = AllocateCopyPool (sizeof (RAM_DISK_CONFIG_PRIVATE_DATA), &mRamDiskConfigPrivateDataTemplate);
+ if (ConfigPrivate == NULL) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ //
+ // Install RAM disk configuration form
+ //
+ Status = InstallRamDiskConfigForm (ConfigPrivate);
+ if (EFI_ERROR (Status)) {
+ goto ErrorExit;
+ }
+
+ //
+ // Install the EFI_RAM_DISK_PROTOCOL and RAM disk private data onto a
+ // new handle
+ //
+ Status = gBS->InstallMultipleProtocolInterfaces (
+ &mRamDiskHandle,
+ &gEfiRamDiskProtocolGuid,
+ &mRamDiskProtocol,
+ &gEfiCallerIdGuid,
+ ConfigPrivate,
+ NULL
+ );
+ if (EFI_ERROR (Status)) {
+ goto ErrorExit;
+ }
+
+ //
+ // Initialize the list of registered RAM disks maintained by the driver
+ //
+ InitializeListHead (&RegisteredRamDisks);
+
+ Status = EfiCreateEventReadyToBootEx (
+ TPL_CALLBACK,
+ RamDiskAcpiCheck,
+ NULL,
+ &Event
+ );
+ ASSERT_EFI_ERROR (Status);
+
+ return EFI_SUCCESS;
+
+ErrorExit:
+ if (ConfigPrivate != NULL) {
+ UninstallRamDiskConfigForm (ConfigPrivate);
+ }
+
+ return Status;
+}
+
+
+/**
+ Unload the RamDiskDxe driver and its configuration form.
+
+ @param[in] ImageHandle The driver's image handle.
+
+ @retval EFI_SUCCESS The RamDiskDxe driver and its configuration
+ form is unloaded.
+ @retval Others Failed to unload the form.
+
+**/
+EFI_STATUS
+EFIAPI
+RamDiskDxeUnload (
+ IN EFI_HANDLE ImageHandle
+ )
+{
+ EFI_STATUS Status;
+ RAM_DISK_CONFIG_PRIVATE_DATA *ConfigPrivate;
+
+ Status = gBS->HandleProtocol (
+ mRamDiskHandle,
+ &gEfiCallerIdGuid,
+ (VOID **) &ConfigPrivate
+ );
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ ASSERT (ConfigPrivate->Signature == RAM_DISK_CONFIG_PRIVATE_DATA_SIGNATURE);
+
+ //
+ // Unregister all registered RAM disks
+ //
+ UnregisterAllRamDisks ();
+
+ gBS->UninstallMultipleProtocolInterfaces (
+ mRamDiskHandle,
+ &gEfiRamDiskProtocolGuid,
+ &mRamDiskProtocol,
+ &gEfiCallerIdGuid,
+ ConfigPrivate,
+ NULL
+ );
+
+ UninstallRamDiskConfigForm (ConfigPrivate);
+
+ return EFI_SUCCESS;
+}
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