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[efi] Ensure that all drivers are shut down before the OS boots

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Reported-by: Itay Gazit <itayg@mellanox.co.il>
Suggested-by: Michael R Turner <mikeyt@us.ibm.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2011-03-29 21:35:06 +01:00
parent 797c29adda
commit fc7239bdc8
3 changed files with 51 additions and 32 deletions
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29
src/interface/efi/efi_init.c
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@@ -22,6 +22,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
#include <ipxe/efi/efi.h>
#include <ipxe/efi/Protocol/LoadedImage.h>
#include <ipxe/uuid.h>
#include <ipxe/init.h>
/** Image handle passed to entry point */
EFI_HANDLE efi_image_handle;
@@ -36,6 +37,21 @@ EFI_SYSTEM_TABLE *efi_systab;
static EFI_GUID efi_loaded_image_protocol_guid
= EFI_LOADED_IMAGE_PROTOCOL_GUID;
/** Event used to signal shutdown */
static EFI_EVENT efi_shutdown_event;
/**
* Shut down in preparation for booting an OS.
*
* This hook gets called at ExitBootServices time in order to make
* sure that everything is properly shut down before the OS takes
* over.
*/
static EFIAPI void efi_shutdown_hook ( EFI_EVENT event __unused,
void *context __unused ) {
shutdown_boot();
}
/**
* Look up EFI configuration table
*
@@ -129,5 +145,18 @@ EFI_STATUS efi_init ( EFI_HANDLE image_handle,
}
}
/* EFI is perfectly capable of gracefully shutting down any
* loaded devices if it decides to fall back to a legacy boot.
* For no particularly comprehensible reason, it doesn't
* bother doing so when ExitBootServices() is called.
*/
if ( ( efirc = bs->CreateEvent ( EVT_SIGNAL_EXIT_BOOT_SERVICES,
TPL_CALLBACK, efi_shutdown_hook,
NULL, &efi_shutdown_event ) ) != 0 ) {
DBGC ( systab, "EFI could not create ExitBootServices event: "
"%s\n", efi_strerror ( efirc ) );
return efirc;
}
return 0;
}