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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 | |
b26f0cf9 | 6 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
170ef2d9 GS |
7 | **/\r |
8 | \r | |
f674fa9c MX |
9 | #include <Uefi/UefiBaseType.h>\r |
10 | #include <Uefi/UefiMultiPhase.h>\r | |
11 | #include <Pi/PiBootMode.h>\r | |
12 | #include <Pi/PiHob.h>\r | |
13 | #include <Library/HobLib.h>\r | |
170ef2d9 GS |
14 | #include <Library/DebugLib.h>\r |
15 | #include <Library/IoLib.h>\r | |
16 | #include <Library/PcdLib.h>\r | |
17 | #include <Library/PciLib.h>\r | |
f674fa9c | 18 | #include <Library/PlatformInitLib.h>\r |
170ef2d9 GS |
19 | #include <OvmfPlatforms.h>\r |
20 | \r | |
170ef2d9 GS |
21 | //\r |
22 | // Cached ACPI Timer IO Address\r | |
23 | //\r | |
ac0a286f | 24 | STATIC UINT32 mAcpiTimerIoAddr;\r |
170ef2d9 GS |
25 | \r |
26 | /**\r | |
27 | The constructor function caches the ACPI tick counter address\r | |
28 | \r | |
29 | At the time this constructor runs (DXE_CORE or later), ACPI IO space\r | |
30 | has already been enabled by either PlatformPei or by the "Base"\r | |
31 | instance of this library.\r | |
32 | In order to avoid querying the underlying platform type during each\r | |
33 | tick counter read operation, we cache the counter address during\r | |
34 | initialization of this instance of the Timer Library.\r | |
35 | \r | |
36 | @retval EFI_SUCCESS The constructor always returns RETURN_SUCCESS.\r | |
37 | \r | |
38 | **/\r | |
39 | RETURN_STATUS\r | |
40 | EFIAPI\r | |
41 | AcpiTimerLibConstructor (\r | |
42 | VOID\r | |
43 | )\r | |
44 | {\r | |
f674fa9c MX |
45 | UINT16 HostBridgeDevId;\r |
46 | UINTN Pmba;\r | |
47 | EFI_HOB_GUID_TYPE *GuidHob;\r | |
48 | EFI_HOB_PLATFORM_INFO *PlatformInfoHob = NULL;\r | |
170ef2d9 GS |
49 | \r |
50 | //\r | |
51 | // Query Host Bridge DID to determine platform type\r | |
f674fa9c MX |
52 | // Tdx guest stores the HostBridgePciDevId in a GuidHob.\r |
53 | // So we first check if this HOB exists\r | |
170ef2d9 | 54 | //\r |
f674fa9c MX |
55 | GuidHob = GetFirstGuidHob (&gUefiOvmfPkgPlatformInfoGuid);\r |
56 | if (GuidHob != NULL) {\r | |
57 | PlatformInfoHob = (EFI_HOB_PLATFORM_INFO *)GET_GUID_HOB_DATA (GuidHob);\r | |
58 | HostBridgeDevId = PlatformInfoHob->HostBridgeDevId;\r | |
59 | } else {\r | |
60 | DEBUG ((DEBUG_ERROR, "PlatformInfoHob is not found.\n"));\r | |
61 | ASSERT (FALSE);\r | |
62 | return RETURN_UNSUPPORTED;\r | |
63 | }\r | |
64 | \r | |
170ef2d9 GS |
65 | switch (HostBridgeDevId) {\r |
66 | case INTEL_82441_DEVICE_ID:\r | |
da372167 | 67 | Pmba = POWER_MGMT_REGISTER_PIIX4 (PIIX4_PMBA);\r |
170ef2d9 GS |
68 | break;\r |
69 | case INTEL_Q35_MCH_DEVICE_ID:\r | |
bc9d05d6 | 70 | Pmba = POWER_MGMT_REGISTER_Q35 (ICH9_PMBASE);\r |
170ef2d9 | 71 | break;\r |
9afcd48a SB |
72 | case CLOUDHV_DEVICE_ID:\r |
73 | mAcpiTimerIoAddr = CLOUDHV_ACPI_TIMER_IO_ADDRESS;\r | |
74 | return RETURN_SUCCESS;\r | |
170ef2d9 | 75 | default:\r |
ac0a286f MK |
76 | DEBUG ((\r |
77 | DEBUG_ERROR,\r | |
78 | "%a: Unknown Host Bridge Device ID: 0x%04x\n",\r | |
79 | __FUNCTION__,\r | |
80 | HostBridgeDevId\r | |
81 | ));\r | |
170ef2d9 GS |
82 | ASSERT (FALSE);\r |
83 | return RETURN_UNSUPPORTED;\r | |
84 | }\r | |
85 | \r | |
86 | mAcpiTimerIoAddr = (PciRead32 (Pmba) & ~PMBA_RTE) + ACPI_TIMER_OFFSET;\r | |
87 | \r | |
88 | return RETURN_SUCCESS;\r | |
89 | }\r | |
90 | \r | |
91 | /**\r | |
92 | Internal function to read the current tick counter of ACPI.\r | |
93 | \r | |
94 | Read the current ACPI tick counter using the counter address cached\r | |
95 | by this instance's constructor.\r | |
96 | \r | |
97 | @return The tick counter read.\r | |
98 | \r | |
99 | **/\r | |
100 | UINT32\r | |
101 | InternalAcpiGetTimerTick (\r | |
102 | VOID\r | |
103 | )\r | |
104 | {\r | |
105 | //\r | |
106 | // Return the current ACPI timer value.\r | |
107 | //\r | |
108 | return IoRead32 (mAcpiTimerIoAddr);\r | |
109 | }\r |