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
  20 MicrovmGedBase (
  21   VOID
  22   )
  23 {
  24   VOID  *Address = (VOID *)(UINTN)MICROVM_GED_MMIO_BASE_REGS;
  25
  26   if (EfiGoneVirtual ()) {
  27     EfiConvertPointer (0, &Address);
  28     DEBUG ((DEBUG_INFO, "%a: virtual -> 0x%x\n", __FUNCTION__, Address));
  29   } else {
  30     DEBUG ((DEBUG_INFO, "%a: physical -> 0x%x\n", __FUNCTION__, Address));
  31   }
  32
  33   return (UINTN)Address;
  34 }
  35
  36 static VOID
  37 MicrovmReset (
  38   VOID
  39   )
  40 {
  41   UINTN  Address = MicrovmGedBase ();
  42
  43   DEBUG ((DEBUG_INFO, "%a: microvm reset via ged\n", __FUNCTION__));
  44   MmioWrite8 (
  45     Address + MICROVM_ACPI_GED_REG_RESET,
  46     MICROVM_ACPI_GED_RESET_VALUE
  47     );
  48   CpuDeadLoop ();
  49 }
  50
  51 static VOID
  52 MicrovmShutdown (
  53   VOID
  54   )
  55 {
  56   UINTN  Address = MicrovmGedBase ();
  57
  58   DEBUG ((DEBUG_INFO, "%a: microvm poweroff via ged\n", __FUNCTION__));
  59   MmioWrite8 (
  60     Address + MICROVM_ACPI_GED_REG_SLEEP_CTL,
  61     (1 << 5) /* enable bit */ |
  62     (5 << 2)           /* typ == S5  */
  63     );
  64   CpuDeadLoop ();
  65 }
  66
  67 VOID EFIAPI
  68 ResetCold (
  69   VOID
  70   )
  71 {
  72   MicrovmReset ();
  73 }
  74
  75 VOID EFIAPI
  76 ResetWarm (
  77   VOID
  78   )
  79 {
  80   MicrovmReset ();
  81 }
  82
  83 VOID
  84 EFIAPI
  85 ResetPlatformSpecific (
  86   IN UINTN  DataSize,
  87   IN VOID   *ResetData
  88   )
  89 {
  90   MicrovmReset ();
  91 }
  92
  93 VOID
  94 EFIAPI
  95 ResetSystem (
  96   IN EFI_RESET_TYPE  ResetType,
  97   IN EFI_STATUS      ResetStatus,
  98   IN UINTN           DataSize,
  99   IN VOID            *ResetData OPTIONAL
 100   )
 101 {
 102   MicrovmReset ();
 103 }
 104
 105 VOID EFIAPI
 106 ResetShutdown (
 107   VOID
 108   )
 109 {
 110   MicrovmShutdown ();
 111 }