Rafal Kupiec
4412d4fc98
Reviewed-on: #7 Reviewed-by: Piotr Likoski <likoski@noreply.codingworkshop.git> Co-authored-by: Rafal Kupiec <belliash@codingworkshop.eu.org> Co-committed-by: Rafal Kupiec <belliash@codingworkshop.eu.org>
121 lines
2.8 KiB
C
121 lines
2.8 KiB
C
/**
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* PROJECT: ExectOS
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* COPYRIGHT: See COPYING.md in the top level directory
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* FILE: xtldr/efiutils.c
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* DESCRIPTION: EFI related routines for XT Boot Loader
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* DEVELOPERS: Rafal Kupiec <belliash@codingworkshop.eu.org>
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*/
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#include <xtldr.h>
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/**
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* Exits EFI boot services.
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*
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* @param MapKey
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* Identifies the current memory map of the system.
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*
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* @return This routine returns status code.
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*
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* @since XT 1.0
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*/
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XTCDECL
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EFI_STATUS
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BlExitBootServices(IN UINT_PTR MapKey)
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{
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EFI_STATUS Status;
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/* Attempt to exit boot services */
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Status = EfiSystemTable->BootServices->ExitBootServices(EfiImageHandle, MapKey);
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if(Status != STATUS_EFI_SUCCESS)
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{
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/* Retry as UEFI spec says to do it twice */
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Status = EfiSystemTable->BootServices->ExitBootServices(EfiImageHandle, MapKey);
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}
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/* Make sure boot services were successfully exited */
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if(Status == STATUS_EFI_SUCCESS)
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{
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/* Mark EFI Boot Services as no longer available */
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BlpStatus.BootServices = FALSE;
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}
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/* Return EFI status code */
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return Status;
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}
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/**
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* Checks whether SecureBoot is enabled or not.
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*
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* @return Numeric representation of SecureBoot status (0 = Disabled, >0 = Enabled, <0 SetupMode).
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*
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* @since XT 1.0
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*/
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XTCDECL
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INT_PTR
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BlGetSecureBootStatus()
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{
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EFI_GUID VarGuid = EFI_GLOBAL_VARIABLE_GUID;
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INT_PTR SecureBootStatus = 0;
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UCHAR VarValue = 0;
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UINT_PTR Size;
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Size = sizeof(VarValue);
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if(EfiSystemTable->RuntimeServices->GetVariable(L"SecureBoot", &VarGuid,
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NULL, &Size, &VarValue) == STATUS_EFI_SUCCESS)
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{
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SecureBootStatus = (INT_PTR)VarValue;
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if((EfiSystemTable->RuntimeServices->GetVariable(L"SetupMode", &VarGuid,
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NULL, &Size, &VarValue) == STATUS_EFI_SUCCESS) && VarValue != 0)
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{
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SecureBootStatus = -1;
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}
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}
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/* Return SecureBoot status */
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return SecureBootStatus;
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}
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/**
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* Puts the system to sleep for the specified number of milliseconds.
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*
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* @param Milliseconds
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* Supplies the number of milliseconds to sleep.
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*
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* @return This routine does not return any value.
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*
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* @since XT 1.0
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*/
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XTCDECL
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VOID
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BlSleepExecution(IN ULONG_PTR Milliseconds)
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{
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EfiSystemTable->BootServices->Stall(Milliseconds * 1000);
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}
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/**
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* Waits for one or more EFI events.
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*
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* @param NumberOfEvents
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* Supplies the number of events to wait for.
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*
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* @param Event
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* Supplies the array of events to wait for.
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*
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* @param Index
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* Receives the index of the event that was signaled.
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*
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* @return This routine returns status code.
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*
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* @since XT 1.0
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*/
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XTCDECL
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EFI_STATUS
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BlWaitForEfiEvent(IN UINT_PTR NumberOfEvents,
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IN PEFI_EVENT Event,
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OUT PUINT_PTR Index)
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{
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return EfiSystemTable->BootServices->WaitForEvent(NumberOfEvents, Event, Index);
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}
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