OvmfPkg/Library/ResetSystemLib/ResetSystemLibMicrovm.c

   1 /** @file
   2   Reset System Library functions for OVMF
   3
   4   Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include <Base.h>                   // BIT1
  10
  11 #include <Library/BaseLib.h>        // CpuDeadLoop()
  12 #include <Library/DebugLib.h>       // ASSERT()
  13 #include <Library/IoLib.h>          // IoWrite8()
  14 #include <Library/ResetSystemLib.h> // ResetCold()
  15 #include <Library/TimerLib.h>       // MicroSecondDelay()
  16 #include <Library/UefiRuntimeLib.h> // EfiGoneVirtual()
  17 #include <OvmfPlatforms.h>          // PIIX4_PMBA_VALUE
  18
  19 static UINTN MicrovmGedBase (VOID)
  20 {
  21   VOID *Address = (VOID*) MICROVM_GED_MMIO_BASE_REGS;
  22
  23   if (EfiGoneVirtual ()) {
  24     EfiConvertPointer (0, &Address);
  25     DEBUG ((DEBUG_INFO, "%a: virtual -> 0x%x\n", __FUNCTION__, Address));
  26   } else {
  27     DEBUG ((DEBUG_INFO, "%a: physical -> 0x%x\n", __FUNCTION__, Address));
  28   }
  29
  30   return (UINTN) Address;
  31 }
  32
  33 static VOID MicrovmReset (VOID)
  34 {
  35   UINTN Address = MicrovmGedBase();
  36
  37   DEBUG ((DEBUG_INFO, "%a: microvm reset via ged\n", __FUNCTION__));
  38   MmioWrite8 (Address + MICROVM_ACPI_GED_REG_RESET,
  39               MICROVM_ACPI_GED_RESET_VALUE);
  40   CpuDeadLoop ();
  41 }
  42
  43 static VOID MicrovmShutdown (VOID)
  44 {
  45   UINTN Address = MicrovmGedBase();
  46
  47   DEBUG ((DEBUG_INFO, "%a: microvm poweroff via ged\n", __FUNCTION__));
  48   MmioWrite8 (Address + MICROVM_ACPI_GED_REG_SLEEP_CTL,
  49               (1 << 5) /* enable bit */ |
  50               (5 << 2) /* typ == S5  */);
  51   CpuDeadLoop ();
  52 }
  53
  54 VOID EFIAPI ResetCold (VOID)
  55 {
  56   MicrovmReset();
  57 }
  58
  59 VOID EFIAPI ResetWarm (VOID)
  60 {
  61   MicrovmReset();
  62 }
  63
  64 VOID
  65 EFIAPI
  66 ResetPlatformSpecific (
  67   IN UINTN   DataSize,
  68   IN VOID    *ResetData
  69   )
  70 {
  71   MicrovmReset();
  72 }
  73
  74 VOID
  75 EFIAPI
  76 ResetSystem (
  77   IN EFI_RESET_TYPE               ResetType,
  78   IN EFI_STATUS                   ResetStatus,
  79   IN UINTN                        DataSize,
  80   IN VOID                         *ResetData OPTIONAL
  81   )
  82 {
  83   MicrovmReset();
  84 }
  85
  86 VOID EFIAPI ResetShutdown (VOID)
  87 {
  88   MicrovmShutdown();
  89 }