diff options
| author | Guo Mang <mang.guo@intel.com> | 2016-06-02 10:19:04 +0800 |
|---|---|---|
| committer | Hao Wu <hao.a.wu@intel.com> | 2016-06-07 09:56:33 +0800 |
| commit | cee0a9629585471876ad8422f45a5d1aa9ed10e4 (patch) | |
| tree | ff6b53095def6b4cea5dc3d8f8cbd202265c8dc8 /BraswellPlatformPkg | |
| parent | f2bcdcd5540522a47aa23186f824d07a3bed9884 (diff) | |
| download | edk2-platforms-cee0a9629585471876ad8422f45a5d1aa9ed10e4.tar.xz | |
BraswellPlatformPkg: Add StallSmmLib
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Guo Mang <mang.guo@intel.com>
Diffstat (limited to 'BraswellPlatformPkg')
| -rw-r--r-- | BraswellPlatformPkg/Library/StallSmmLib/StallSmm.c | 85 | ||||
| -rw-r--r-- | BraswellPlatformPkg/Library/StallSmmLib/StallSmmLib.inf | 48 |
2 files changed, 133 insertions, 0 deletions
diff --git a/BraswellPlatformPkg/Library/StallSmmLib/StallSmm.c b/BraswellPlatformPkg/Library/StallSmmLib/StallSmm.c new file mode 100644 index 0000000000..4e90d5a07d --- /dev/null +++ b/BraswellPlatformPkg/Library/StallSmmLib/StallSmm.c @@ -0,0 +1,85 @@ +/** @file
+ SMM I/O access utility implementation file, for Ia32
+
+ Copyright (c) 1999 - 2015, Intel Corporation. All rights reserved.<BR>
+
+ This program and the accompanying materials
+ are licensed and made available under the terms and conditions of the BSD License
+ which accompanies this distribution. The full text of the license may be found at
+ http://opensource.org/licenses/bsd-license.php.
+
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+//
+// Include files
+//
+#include "Library/StallSmmLib.h"
+#include "Pi/PiSmmCis.h"
+#include "PiDxe.h"
+#include <Library/IoLib.h>
+#include <Library/PcdLib.h>
+#include "PchAccess.h"
+
+/**
+ Delay for at least the request number of microseconds.
+ Timer used is ACPI time counter, which has 1us granularity.
+
+ @param[in] Microseconds Number of microseconds to delay.
+
+ @retval None
+
+**/
+VOID
+SmmStall (
+ IN UINTN Microseconds
+ )
+{
+ UINTN Ticks;
+ UINTN Counts;
+ UINTN CurrentTick;
+ UINTN OriginalTick;
+ UINTN RemainingTick;
+ UINT16 AcpiBaseAddr;
+
+ if (Microseconds == 0) {
+ return;
+ }
+
+ AcpiBaseAddr = PchLpcPciCfg16 (R_PCH_LPC_ACPI_BASE) & B_PCH_LPC_ACPI_BASE_BAR;
+
+ OriginalTick = IoRead32 (AcpiBaseAddr + R_PCH_ACPI_PM1_TMR);
+ CurrentTick = OriginalTick;
+
+ //
+ // The timer frequency is 3.579545 MHz, so 1 ms corresponds 3.58 clocks
+ //
+ Ticks = Microseconds * 358 / 100 + OriginalTick + 1;
+
+ //
+ // The loops needed by timer overflow
+ //
+ Counts = Ticks / V_PCH_ACPI_PM1_TMR_MAX_VAL;
+
+ //
+ // Remaining clocks within one loop
+ //
+ RemainingTick = Ticks % V_PCH_ACPI_PM1_TMR_MAX_VAL;
+
+ //
+ // not intend to use TMROF_STS bit of register PM1_STS, because this adds extra
+ // one I/O operation, and maybe generate SMI
+ //
+ while ((Counts != 0) || (RemainingTick > CurrentTick)) {
+ CurrentTick = IoRead32 (AcpiBaseAddr + R_PCH_ACPI_PM1_TMR);
+ //
+ // Check if timer overflow
+ //
+ if (CurrentTick < OriginalTick) {
+ Counts--;
+ }
+ OriginalTick = CurrentTick;
+ }
+}
diff --git a/BraswellPlatformPkg/Library/StallSmmLib/StallSmmLib.inf b/BraswellPlatformPkg/Library/StallSmmLib/StallSmmLib.inf new file mode 100644 index 0000000000..700883f6cd --- /dev/null +++ b/BraswellPlatformPkg/Library/StallSmmLib/StallSmmLib.inf @@ -0,0 +1,48 @@ +## @file
+# Component description file for SmmStall library
+#
+# Time stall in SMM mode
+#
+# Copyright (c) 1999 - 2015, Intel Corporation. All rights reserved.<BR>
+#
+# This program and the accompanying materials
+# are licensed and made available under the terms and conditions of the BSD License
+# which accompanies this distribution. The full text of the license may be found at
+# http://opensource.org/licenses/bsd-license.php.
+#
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+##
+
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = StallSmmLib
+ FILE_GUID = A6A16CCB-91B0-42f4-B4F3-D16D7A8662E6
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = StallSmmLib
+
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+# VALID_ARCHITECTURES = IA32 X64 IPF EBC
+#
+
+[Sources]
+ StallSmm.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+ BraswellPlatformPkg/BraswellPlatformPkg.dec
+ ChvRefCodePkg/ChvRefCodePkg.dec
+
+[LibraryClasses]
+ PcdLib
+ IoLib
+ BaseLib
+
+[Pcd]
+ gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress ## CONSUMES
+
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