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18b144ea | 1 | /** @file\r |
2 | Code for debug timer to support debug agent library implementation.\r | |
3 | \r | |
b422b62c | 4 | Copyright (c) 2010 - 2013, Intel Corporation. All rights reserved.<BR>\r |
18b144ea | 5 | This program and the accompanying materials\r |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php.\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | **/\r | |
14 | \r | |
15 | #include "DebugAgent.h"\r | |
16 | \r | |
17 | /**\r | |
18 | Initialize CPU local APIC timer.\r | |
19 | \r | |
20 | **/\r | |
21 | VOID\r | |
22 | InitializeDebugTimer (\r | |
23 | VOID\r | |
24 | )\r | |
25 | {\r | |
26 | UINTN ApicTimerDivisor;\r | |
27 | UINT32 InitialCount;\r | |
28 | \r | |
29 | GetApicTimerState (&ApicTimerDivisor, NULL, NULL);\r | |
30 | \r | |
31 | //\r | |
32 | // Cpu Local Apic timer interrupt frequency, it is set to 0.1s\r | |
33 | //\r | |
34 | InitialCount = (UINT32)DivU64x32 (\r | |
35 | MultU64x64 (\r | |
36 | PcdGet32(PcdFSBClock) / (UINT32)ApicTimerDivisor,\r | |
37 | 100\r | |
38 | ),\r | |
39 | 1000\r | |
40 | );\r | |
41 | \r | |
42 | InitializeApicTimer (ApicTimerDivisor, InitialCount, TRUE, DEBUG_TIMER_VECTOR);\r | |
43 | \r | |
b422b62c | 44 | if (MultiProcessorDebugSupport()) {\r |
18b144ea | 45 | mDebugMpContext.DebugTimerInitCount = InitialCount;\r |
46 | }\r | |
47 | }\r | |
48 | \r | |
49 | /**\r | |
50 | Enable/Disable the interrupt of debug timer and return the interrupt state\r | |
51 | prior to the operation.\r | |
52 | \r | |
53 | If EnableStatus is TRUE, enable the interrupt of debug timer.\r | |
54 | If EnableStatus is FALSE, disable the interrupt of debug timer.\r | |
55 | \r | |
56 | @param[in] EnableStatus Enable/Disable.\r | |
57 | \r | |
58 | @retval TRUE Debug timer interrupt were enabled on entry to this call.\r | |
59 | @retval FALSE Debug timer interrupt were disabled on entry to this call.\r | |
60 | \r | |
61 | **/\r | |
62 | BOOLEAN\r | |
63 | EFIAPI\r | |
64 | SaveAndSetDebugTimerInterrupt (\r | |
65 | IN BOOLEAN EnableStatus\r | |
66 | )\r | |
67 | {\r | |
18b144ea | 68 | BOOLEAN OldDebugTimerInterruptState;\r |
69 | \r | |
18b144ea | 70 | OldDebugTimerInterruptState = GetApicTimerInterruptState ();\r |
71 | \r | |
b422b62c | 72 | if (OldDebugTimerInterruptState != EnableStatus) {\r |
73 | if (EnableStatus) {\r | |
74 | EnableApicTimerInterrupt ();\r | |
75 | } else {\r | |
76 | DisableApicTimerInterrupt ();\r | |
77 | }\r | |
78 | //\r | |
79 | // Validate the Debug Timer interrupt state\r | |
80 | // This will make additional delay after Local Apic Timer interrupt state is changed.\r | |
81 | // Thus, CPU could handle the potential pending interrupt of Local Apic timer.\r | |
82 | //\r | |
83 | while (GetApicTimerInterruptState () != EnableStatus) {\r | |
84 | CpuPause ();\r | |
85 | }\r | |
18b144ea | 86 | }\r |
b422b62c | 87 | \r |
18b144ea | 88 | return OldDebugTimerInterruptState;\r |
89 | }\r | |
90 | \r |