OvmfPkg/QemuFwCfgDxeLib: SEV: zero FW_CFG_DMA_ACCESS before decrypting it

[mirror_edk2.git] / OvmfPkg / Library / AcpiTimerLib / AcpiTimerLib.c

diff --git a/OvmfPkg/Library/AcpiTimerLib/AcpiTimerLib.c b/OvmfPkg/Library/AcpiTimerLib/AcpiTimerLib.c
index 949a89d71394e635a8715b27cfb3177b1a6f0839..938b77cdc66ca26b60ca4c59d699be4eb6b01fca 100644 (file)
--- a/OvmfPkg/Library/AcpiTimerLib/AcpiTimerLib.c
+++ b/OvmfPkg/Library/AcpiTimerLib/AcpiTimerLib.c
@@ -1,70 +1,29 @@
 /** @file\r
   ACPI Timer implements one instance of Timer Library.\r
 \r
-  Copyright (c) 2008, Intel Corporation<BR> All rights\r
-  reserved. This program and the accompanying materials are\r
+  Copyright (c) 2008 - 2012, Intel Corporation. All rights reserved.<BR>\r
+  Copyright (c) 2011, Andrei Warkentin <andreiw@motorola.com>\r
+\r
+  This program and the accompanying materials are\r
   licensed and made available under the terms and conditions of the BSD License\r
   which accompanies this distribution.  The full text of the license may be found at\r
   http://opensource.org/licenses/bsd-license.php\r
-  \r
+\r
   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
 \r
-**/ \r
+**/\r
 \r
-#include <Base.h>\r
-#include <Library/TimerLib.h>\r
+#include <Library/DebugLib.h>\r
 #include <Library/BaseLib.h>\r
-#include <Library/IoLib.h>\r
-#include <Library/PciLib.h>\r
-\r
-#define ACPI_TIMER_FREQUENCY   3579545\r
-#define ACPI_TIMER_COUNT_SIZE  0x01000000\r
-\r
-/**\r
-  The constructor function enables ACPI IO space.\r
-\r
-  If ACPI I/O space not enabled, this function will enable it.\r
-  It will always return RETURN_SUCCESS.\r
-\r
-  @retval EFI_SUCCESS   The constructor always returns RETURN_SUCCESS.\r
-\r
-**/\r
-RETURN_STATUS\r
-EFIAPI\r
-AcpiTimerLibConstructor (\r
-  VOID\r
-  )\r
-{\r
-  UINT8 Device;\r
+#include <IndustryStandard/Acpi.h>\r
 \r
-  Device = 1;\r
-  // Device = 7;\r
+#include "AcpiTimerLib.h"\r
 \r
-  //\r
-  // ACPI Timer enable is in Bus 0, Device ?, Function 3\r
-  //\r
-  PciOr8         (PCI_LIB_ADDRESS (0,Device,3,0x04), 0x01);\r
-  PciAndThenOr32 (PCI_LIB_ADDRESS (0,Device,3,0x40), (UINT32) ~0xfc0, 0x400);\r
-  PciOr8         (PCI_LIB_ADDRESS (0,Device,3,0x80), 0x01);  return RETURN_SUCCESS;\r
-}\r
-\r
-/**\r
-  Internal function to read the current tick counter of ACPI.\r
-\r
-  Internal function to read the current tick counter of ACPI.\r
-\r
-  @return The tick counter read.\r
-\r
-**/\r
-STATIC\r
-UINT32\r
-InternalAcpiGetTimerTick (\r
-  VOID\r
-  )\r
-{\r
-  return IoRead32 (0x408);\r
-}\r
+//\r
+// The ACPI Time is a 24-bit counter\r
+//\r
+#define ACPI_TIMER_COUNT_SIZE  BIT24\r
 \r
 /**\r
   Stalls the CPU for at least the given number of ticks.\r
@@ -75,7 +34,6 @@ InternalAcpiGetTimerTick (
   @param  Delay     A period of time to delay in ticks.\r
 \r
 **/\r
-STATIC\r
 VOID\r
 InternalAcpiDelay (\r
   IN      UINT32                    Delay\r
@@ -220,3 +178,39 @@ GetPerformanceCounterProperties (
 \r
   return ACPI_TIMER_FREQUENCY;\r
 }\r
+\r
+/**\r
+  Converts elapsed ticks of performance counter to time in nanoseconds.\r
+\r
+  This function converts the elapsed ticks of running performance counter to\r
+  time value in unit of nanoseconds.\r
+\r
+  @param  Ticks     The number of elapsed ticks of running performance counter.\r
+\r
+  @return The elapsed time in nanoseconds.\r
+\r
+**/\r
+UINT64\r
+EFIAPI\r
+GetTimeInNanoSecond (\r
+  IN      UINT64                     Ticks\r
+  )\r
+{\r
+  UINT64  NanoSeconds;\r
+  UINT32  Remainder;\r
+\r
+  //\r
+  //          Ticks\r
+  // Time = --------- x 1,000,000,000\r
+  //        Frequency\r
+  //\r
+  NanoSeconds = MultU64x32 (DivU64x32Remainder (Ticks, ACPI_TIMER_FREQUENCY, &Remainder), 1000000000u);\r
+\r
+  //\r
+  // Frequency < 0x100000000, so Remainder < 0x100000000, then (Remainder * 1,000,000,000)\r
+  // will not overflow 64-bit.\r
+  //\r
+  NanoSeconds += DivU64x32 (MultU64x32 ((UINT64) Remainder, 1000000000u), ACPI_TIMER_FREQUENCY);\r
+\r
+  return NanoSeconds;\r
+}\r