mirror of https://github.com/acidanthera/audk.git
85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
/*++
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Copyright (c) 2013-2014, ARM Ltd. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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Module Name:
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ArmGicDxe.c
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Abstract:
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Driver implementing the GIC interrupt controller protocol
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--*/
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#include <PiDxe.h>
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#include "ArmGicDxe.h"
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STATIC
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BOOLEAN
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GicV3Supported (
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VOID
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)
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{
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UINT32 IccSre;
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// Ideally we would like to use the GICC IIDR Architecture version here, but
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// this does not seem to be very reliable as the implementation could easily
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// get it wrong. It is more reliable to check if the GICv3 System Register
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// feature is implemented on the CPU. This is also convenient as our GICv3
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// driver requires SRE. If only Memory mapped access is available we try to
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// drive the GIC as a v2.
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if (ArmHasGicSystemRegisters ()) {
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// Make sure System Register access is enabled (SRE). This depends on the
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// higher privilege level giving us permission, otherwise we will either
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// cause an exception here, or the write doesn't stick in which case we need
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// to fall back to the GICv2 MMIO interface.
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// Note: We do not need to set ICC_SRE_EL2.Enable because the OS is started
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// at the same exception level.
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// It is the OS responsibility to set this bit.
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IccSre = ArmGicV3GetControlSystemRegisterEnable ();
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if (!(IccSre & ICC_SRE_EL2_SRE)) {
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ArmGicV3SetControlSystemRegisterEnable (IccSre | ICC_SRE_EL2_SRE);
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IccSre = ArmGicV3GetControlSystemRegisterEnable ();
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}
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if (IccSre & ICC_SRE_EL2_SRE) {
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return TRUE;
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}
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}
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return FALSE;
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}
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/**
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Initialize the state information for the CPU Architectural Protocol
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@param ImageHandle of the loaded driver
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@param SystemTable Pointer to the System Table
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@retval EFI_SUCCESS Protocol registered
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@retval EFI_OUT_OF_RESOURCES Cannot allocate protocol data structure
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@retval EFI_DEVICE_ERROR Hardware problems
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@retval EFI_UNSUPPORTED GIC version not supported
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**/
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EFI_STATUS
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InterruptDxeInitialize (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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EFI_STATUS Status;
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if (!GicV3Supported ()) {
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Status = GicV2DxeInitialize (ImageHandle, SystemTable);
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} else {
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Status = GicV3DxeInitialize (ImageHandle, SystemTable);
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}
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return Status;
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}
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