ArmPkg/Drivers/PL390Gic/PL390Gic.c

   1 /** @file
   2 *
   3 *  Copyright (c) 2011, ARM Limited. All rights reserved.
   4 *
   5 *  This program and the accompanying materials
   6 *  are licensed and made available under the terms and conditions of the BSD License
   7 *  which accompanies this distribution.  The full text of the license may be found at
   8 *  http://opensource.org/licenses/bsd-license.php
   9 *
  10 *  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 *  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12 *
  13 **/
  14
  15 #include <Uefi.h>
  16 #include <Library/IoLib.h>
  17 #include <Library/ArmGicLib.h>
  18 #include <Library/PcdLib.h>
  19
  20 VOID
  21 EFIAPI
  22 ArmGicSendSgiTo (
  23   IN  INTN          GicDistributorBase,
  24   IN  INTN          TargetListFilter,
  25   IN  INTN          CPUTargetList
  26   )
  27 {
  28   MmioWrite32 (GicDistributorBase + ARM_GIC_ICDSGIR, ((TargetListFilter & 0x3) << 24) | ((CPUTargetList & 0xFF) << 16) | PcdGet32(PcdGicSgiIntId));
  29 }
  30
  31 UINT32
  32 EFIAPI
  33 ArmGicAcknowledgeSgiFrom (
  34   IN  INTN          GicInterruptInterfaceBase,
  35   IN  INTN          CoreId
  36   )
  37 {
  38   INTN            InterruptId;
  39
  40   InterruptId = MmioRead32 (GicInterruptInterfaceBase + ARM_GIC_ICCIAR);
  41
  42   // Check if the Interrupt ID is valid, The read from Interrupt Ack register returns CPU ID and Interrupt ID
  43   if ((((CoreId & 0x7) << 10) | PcdGet32(PcdGicSgiIntId)) == InterruptId) {
  44     // Got SGI number 0 hence signal End of Interrupt by writing to ICCEOIR
  45     MmioWrite32 (GicInterruptInterfaceBase + ARM_GIC_ICCEIOR, InterruptId);
  46     return 1;
  47   } else {
  48     return 0;
  49   }
  50 }
  51
  52 UINT32
  53 EFIAPI
  54 ArmGicAcknowledgeSgi2From (
  55   IN  INTN          GicInterruptInterfaceBase,
  56   IN  INTN          CoreId,
  57   IN  INTN          SgiId
  58   )
  59 {
  60   INTN            InterruptId;
  61
  62   InterruptId = MmioRead32(GicInterruptInterfaceBase + ARM_GIC_ICCIAR);
  63
  64   // Check if the Interrupt ID is valid, The read from Interrupt Ack register returns CPU ID and Interrupt ID
  65   if((((CoreId & 0x7) << 10) | (SgiId & 0x3FF)) == (InterruptId & 0x1FFF)) {
  66     // Got SGI number 0 hence signal End of Interrupt by writing to ICCEOIR
  67     MmioWrite32 (GicInterruptInterfaceBase + ARM_GIC_ICCEIOR, InterruptId);
  68     return 1;
  69   } else {
  70     return 0;
  71   }
  72 }