projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 170ef2d9 GS |
1 | /** @file\r |
| 2 | Provide constructor and GetTick for Dxe instance of ACPI Timer Library\r | |
| 3 | \r | |
| 4 | Copyright (C) 2014, Gabriel L. Somlo <somlo@cmu.edu>\r | |
| 5 | \r | |
| 6 | This program and the accompanying materials are licensed and made\r | |
| 7 | available under the terms and conditions of the BSD License which\r | |
| 8 | accompanies this distribution. The full text of the license may\r | |
| 9 | be found at http://opensource.org/licenses/bsd-license.php\r | |
| 10 | \r | |
| 11 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 12 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 13 | **/\r | |
| 14 | \r | |
| 15 | #include <Library/DebugLib.h>\r | |
| 16 | #include <Library/IoLib.h>\r | |
| 17 | #include <Library/PcdLib.h>\r | |
| 18 | #include <Library/PciLib.h>\r | |
| 19 | #include <OvmfPlatforms.h>\r | |
| 20 | \r | |
| 21 | //\r | |
| 22 | // Power Management PCI Configuration Register fields\r | |
| 23 | //\r | |
| 24 | #define PMBA_RTE BIT0\r | |
| 25 | \r | |
| 26 | //\r | |
| 27 | // Offset in the Power Management Base Address to the ACPI Timer\r | |
| 28 | //\r | |
| 29 | #define ACPI_TIMER_OFFSET 0x8\r | |
| 30 | \r | |
| 31 | //\r | |
| 32 | // Cached ACPI Timer IO Address\r | |
| 33 | //\r | |
| 34 | STATIC UINT32 mAcpiTimerIoAddr;\r | |
| 35 | \r | |
| 36 | /**\r | |
| 37 | The constructor function caches the ACPI tick counter address\r | |
| 38 | \r | |
| 39 | At the time this constructor runs (DXE_CORE or later), ACPI IO space\r | |
| 40 | has already been enabled by either PlatformPei or by the "Base"\r | |
| 41 | instance of this library.\r | |
| 42 | In order to avoid querying the underlying platform type during each\r | |
| 43 | tick counter read operation, we cache the counter address during\r | |
| 44 | initialization of this instance of the Timer Library.\r | |
| 45 | \r | |
| 46 | @retval EFI_SUCCESS The constructor always returns RETURN_SUCCESS.\r | |
| 47 | \r | |
| 48 | **/\r | |
| 49 | RETURN_STATUS\r | |
| 50 | EFIAPI\r | |
| 51 | AcpiTimerLibConstructor (\r | |
| 52 | VOID\r | |
| 53 | )\r | |
| 54 | {\r | |
| 55 | UINT16 HostBridgeDevId;\r | |
| 56 | UINTN Pmba;\r | |
| 57 | \r | |
| 58 | //\r | |
| 59 | // Query Host Bridge DID to determine platform type\r | |
| 60 | //\r | |
| 61 | HostBridgeDevId = PcdGet16 (PcdOvmfHostBridgePciDevId);\r | |
| 62 | switch (HostBridgeDevId) {\r | |
| 63 | case INTEL_82441_DEVICE_ID:\r | |
| da372167 | 64 | Pmba = POWER_MGMT_REGISTER_PIIX4 (PIIX4_PMBA);\r |
| 170ef2d9 GS |
65 | break;\r |
| 66 | case INTEL_Q35_MCH_DEVICE_ID:\r | |
| bc9d05d6 | 67 | Pmba = POWER_MGMT_REGISTER_Q35 (ICH9_PMBASE);\r |
| 170ef2d9 GS |
68 | break;\r |
| 69 | default:\r | |
| 70 | DEBUG ((EFI_D_ERROR, "%a: Unknown Host Bridge Device ID: 0x%04x\n",\r | |
| 71 | __FUNCTION__, HostBridgeDevId));\r | |
| 72 | ASSERT (FALSE);\r | |
| 73 | return RETURN_UNSUPPORTED;\r | |
| 74 | }\r | |
| 75 | \r | |
| 76 | mAcpiTimerIoAddr = (PciRead32 (Pmba) & ~PMBA_RTE) + ACPI_TIMER_OFFSET;\r | |
| 77 | \r | |
| 78 | return RETURN_SUCCESS;\r | |
| 79 | }\r | |
| 80 | \r | |
| 81 | /**\r | |
| 82 | Internal function to read the current tick counter of ACPI.\r | |
| 83 | \r | |
| 84 | Read the current ACPI tick counter using the counter address cached\r | |
| 85 | by this instance's constructor.\r | |
| 86 | \r | |
| 87 | @return The tick counter read.\r | |
| 88 | \r | |
| 89 | **/\r | |
| 90 | UINT32\r | |
| 91 | InternalAcpiGetTimerTick (\r | |
| 92 | VOID\r | |
| 93 | )\r | |
| 94 | {\r | |
| 95 | //\r | |
| 96 | // Return the current ACPI timer value.\r | |
| 97 | //\r | |
| 98 | return IoRead32 (mAcpiTimerIoAddr);\r | |
| 99 | }\r |