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[efi] Allow driver to be unloaded

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2014-03-10 15:42:21 +00:00
parent 9681170fbe
commit 8de6b973c4
5 changed files with 159 additions and 4 deletions
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97
src/interface/efi/efi_init.c
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@@ -22,6 +22,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
#include <string.h>
#include <errno.h>
#include <ipxe/efi/efi.h>
#include <ipxe/efi/efi_driver.h>
#include <ipxe/efi/Protocol/LoadedImage.h>
#include <ipxe/efi/Protocol/DevicePath.h>
#include <ipxe/uuid.h>
@@ -50,6 +51,64 @@ static EFI_GUID efi_loaded_image_device_path_protocol_guid
/** Event used to signal shutdown */
static EFI_EVENT efi_shutdown_event;
/* Forward declarations */
static EFI_STATUS EFIAPI efi_unload ( EFI_HANDLE image_handle );
/**
* Check to see if driver supports a device
*
* @v driver EFI driver
* @v device EFI device
* @v child Path to child device, if any
* @ret efirc EFI status code
*/
static EFI_STATUS EFIAPI
efi_image_supported ( EFI_DRIVER_BINDING_PROTOCOL *driver __unused,
EFI_HANDLE device __unused,
EFI_DEVICE_PATH_PROTOCOL *child __unused ) {
return EFI_UNSUPPORTED;
}
/**
* Attach driver to device
*
* @v driver EFI driver
* @v device EFI device
* @v child Path to child device, if any
* @ret efirc EFI status code
*/
static EFI_STATUS EFIAPI
efi_image_start ( EFI_DRIVER_BINDING_PROTOCOL *driver __unused,
EFI_HANDLE device __unused,
EFI_DEVICE_PATH_PROTOCOL *child __unused ) {
return EFI_UNSUPPORTED;
}
/**
* Detach driver from device
*
* @v driver EFI driver
* @v device EFI device
* @v pci PCI device
* @v num_children Number of child devices
* @v children List of child devices
* @ret efirc EFI status code
*/
static EFI_STATUS EFIAPI
efi_image_stop ( EFI_DRIVER_BINDING_PROTOCOL *driver __unused,
EFI_HANDLE device __unused, UINTN num_children __unused,
EFI_HANDLE *children __unused ) {
return EFI_UNSUPPORTED;
}
/** EFI loaded image driver */
static struct efi_driver efi_image_driver =
EFI_DRIVER_INIT ( NULL, efi_image_supported, efi_image_start,
efi_image_stop );
/**
* Shut down in preparation for booting an OS.
*
@@ -189,5 +248,43 @@ EFI_STATUS efi_init ( EFI_HANDLE image_handle,
return efirc;
}
/* Install an EFI driver on the image handle, to allow the
* driver to be subsequently unloaded.
*/
efi_image_driver.driver.DriverBindingHandle = image_handle;
if ( ( rc = efi_driver_install ( &efi_image_driver ) ) != 0 ) {
DBGC ( systab, "EFI could not install loaded image driver: "
"%s\n", strerror ( rc ) );
return EFIRC ( rc );
}
/* Install image unload method */
efi_loaded_image->Unload = efi_unload;
return 0;
}
/**
* Shut down EFI environment
*
* @v image_handle Image handle
*/
static EFI_STATUS EFIAPI efi_unload ( EFI_HANDLE image_handle __unused ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_SYSTEM_TABLE *systab = efi_systab;
DBGC ( systab, "EFI image unloading\n" );
/* Shut down */
shutdown_exit();
/* Uninstall exit boot services event */
bs->CloseEvent ( efi_shutdown_event );
/* Uninstall loaded image driver */
efi_driver_uninstall ( &efi_image_driver );
DBGC ( systab, "EFI image unloaded\n" );
return 0;
}