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1ef41207 | 1 | /** @file\r |
2 | A non-functional instance of the Timer Library.\r | |
3 | \r | |
d652b458 | 4 | Copyright (c) 2007 - 2019, Intel Corporation. All rights reserved.<BR>\r |
e3ba31da | 5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
1ef41207 | 6 | \r |
7 | **/\r | |
8 | \r | |
9 | #include <PiPei.h>\r | |
d652b458 | 10 | #include <Library/BaseLib.h>\r |
1ef41207 | 11 | #include <Library/TimerLib.h>\r |
12 | #include <Library/DebugLib.h>\r | |
13 | #include <Library/PeiServicesLib.h>\r | |
14 | \r | |
15 | #include <Ppi/EmuThunk.h>\r | |
16 | #include <Protocol/EmuThunk.h>\r | |
17 | \r | |
18 | /**\r | |
19 | Stalls the CPU for at least the given number of microseconds.\r | |
20 | \r | |
21 | Stalls the CPU for the number of microseconds specified by MicroSeconds.\r | |
22 | \r | |
23 | @param MicroSeconds The minimum number of microseconds to delay.\r | |
24 | \r | |
25 | @return The value of MicroSeconds inputted.\r | |
26 | \r | |
27 | **/\r | |
28 | UINTN\r | |
29 | EFIAPI\r | |
30 | MicroSecondDelay (\r | |
31 | IN UINTN MicroSeconds\r | |
32 | )\r | |
33 | {\r | |
34 | return NanoSecondDelay (MicroSeconds * 1000);\r | |
35 | }\r | |
36 | \r | |
37 | /**\r | |
38 | Stalls the CPU for at least the given number of nanoseconds.\r | |
39 | \r | |
40 | Stalls the CPU for the number of nanoseconds specified by NanoSeconds.\r | |
41 | \r | |
42 | @param NanoSeconds The minimum number of nanoseconds to delay.\r | |
43 | \r | |
44 | @return The value of NanoSeconds inputted.\r | |
45 | \r | |
46 | **/\r | |
47 | UINTN\r | |
48 | EFIAPI\r | |
49 | NanoSecondDelay (\r | |
50 | IN UINTN NanoSeconds\r | |
51 | )\r | |
52 | {\r | |
53 | EMU_THUNK_PPI *ThunkPpi;\r | |
54 | EFI_STATUS Status;\r | |
55 | EMU_THUNK_PROTOCOL *Thunk;\r | |
56 | \r | |
57 | //\r | |
d18d8a1d | 58 | // Locate EmuThunkPpi for\r |
1ef41207 | 59 | //\r |
60 | Status = PeiServicesLocatePpi (\r | |
61 | &gEmuThunkPpiGuid,\r | |
62 | 0,\r | |
63 | NULL,\r | |
64 | (VOID **) &ThunkPpi\r | |
65 | );\r | |
d18d8a1d | 66 | if (!EFI_ERROR (Status)) {\r |
1ef41207 | 67 | Thunk = (EMU_THUNK_PROTOCOL *)ThunkPpi->Thunk ();\r |
68 | Thunk->Sleep (NanoSeconds * 100);\r | |
69 | return NanoSeconds;\r | |
70 | }\r | |
71 | \r | |
72 | return 0;\r | |
73 | }\r | |
74 | \r | |
75 | /**\r | |
76 | Retrieves the current value of a 64-bit free running performance counter.\r | |
77 | \r | |
78 | The counter can either count up by 1 or count down by 1. If the physical\r | |
79 | performance counter counts by a larger increment, then the counter values\r | |
80 | must be translated. The properties of the counter can be retrieved from\r | |
81 | GetPerformanceCounterProperties().\r | |
82 | \r | |
83 | @return The current value of the free running performance counter.\r | |
84 | \r | |
85 | **/\r | |
86 | UINT64\r | |
87 | EFIAPI\r | |
88 | GetPerformanceCounter (\r | |
89 | VOID\r | |
90 | )\r | |
91 | {\r | |
92 | EMU_THUNK_PPI *ThunkPpi;\r | |
93 | EFI_STATUS Status;\r | |
94 | EMU_THUNK_PROTOCOL *Thunk;\r | |
95 | \r | |
96 | //\r | |
d18d8a1d | 97 | // Locate EmuThunkPpi for\r |
1ef41207 | 98 | //\r |
99 | Status = PeiServicesLocatePpi (\r | |
100 | &gEmuThunkPpiGuid,\r | |
101 | 0,\r | |
102 | NULL,\r | |
103 | (VOID **) &ThunkPpi\r | |
104 | );\r | |
d18d8a1d | 105 | if (!EFI_ERROR (Status)) {\r |
1ef41207 | 106 | Thunk = (EMU_THUNK_PROTOCOL *)ThunkPpi->Thunk ();\r |
107 | return Thunk->QueryPerformanceCounter ();\r | |
108 | }\r | |
109 | \r | |
110 | return 0;\r | |
111 | }\r | |
112 | \r | |
113 | /**\r | |
114 | Retrieves the 64-bit frequency in Hz and the range of performance counter\r | |
115 | values.\r | |
116 | \r | |
117 | If StartValue is not NULL, then the value that the performance counter starts\r | |
118 | with immediately after is it rolls over is returned in StartValue. If\r | |
119 | EndValue is not NULL, then the value that the performance counter end with\r | |
120 | immediately before it rolls over is returned in EndValue. The 64-bit\r | |
121 | frequency of the performance counter in Hz is always returned. If StartValue\r | |
122 | is less than EndValue, then the performance counter counts up. If StartValue\r | |
123 | is greater than EndValue, then the performance counter counts down. For\r | |
124 | example, a 64-bit free running counter that counts up would have a StartValue\r | |
125 | of 0 and an EndValue of 0xFFFFFFFFFFFFFFFF. A 24-bit free running counter\r | |
126 | that counts down would have a StartValue of 0xFFFFFF and an EndValue of 0.\r | |
127 | \r | |
128 | @param StartValue The value the performance counter starts with when it\r | |
129 | rolls over.\r | |
130 | @param EndValue The value that the performance counter ends with before\r | |
131 | it rolls over.\r | |
132 | \r | |
133 | @return The frequency in Hz.\r | |
134 | \r | |
135 | **/\r | |
136 | UINT64\r | |
137 | EFIAPI\r | |
138 | GetPerformanceCounterProperties (\r | |
139 | OUT UINT64 *StartValue, OPTIONAL\r | |
140 | OUT UINT64 *EndValue OPTIONAL\r | |
141 | )\r | |
142 | {\r | |
143 | EMU_THUNK_PPI *ThunkPpi;\r | |
144 | EFI_STATUS Status;\r | |
145 | EMU_THUNK_PROTOCOL *Thunk;\r | |
146 | \r | |
147 | //\r | |
d18d8a1d | 148 | // Locate EmuThunkPpi for\r |
1ef41207 | 149 | //\r |
150 | Status = PeiServicesLocatePpi (\r | |
151 | &gEmuThunkPpiGuid,\r | |
152 | 0,\r | |
153 | NULL,\r | |
154 | (VOID **) &ThunkPpi\r | |
155 | );\r | |
156 | if (!EFI_ERROR (Status)) {\r | |
157 | if (StartValue != NULL) {\r | |
158 | *StartValue = 0ULL;\r | |
159 | }\r | |
160 | if (EndValue != NULL) {\r | |
161 | *EndValue = (UINT64)-1LL;\r | |
162 | }\r | |
d18d8a1d | 163 | \r |
1ef41207 | 164 | Thunk = (EMU_THUNK_PROTOCOL *)ThunkPpi->Thunk ();\r |
165 | return Thunk->QueryPerformanceFrequency ();\r | |
166 | }\r | |
167 | \r | |
168 | return 0;\r | |
169 | }\r | |
d652b458 MJ |
170 | \r |
171 | /**\r | |
172 | Converts elapsed ticks of performance counter to time in nanoseconds.\r | |
173 | \r | |
174 | This function converts the elapsed ticks of running performance counter to\r | |
175 | time value in unit of nanoseconds.\r | |
176 | \r | |
177 | @param Ticks The number of elapsed ticks of running performance counter.\r | |
178 | \r | |
179 | @return The elapsed time in nanoseconds.\r | |
180 | \r | |
181 | **/\r | |
182 | UINT64\r | |
183 | EFIAPI\r | |
184 | GetTimeInNanoSecond (\r | |
185 | IN UINT64 Ticks\r | |
186 | )\r | |
187 | {\r | |
188 | UINT64 Frequency;\r | |
189 | UINT64 NanoSeconds;\r | |
190 | UINT64 Remainder;\r | |
191 | INTN Shift;\r | |
192 | \r | |
193 | Frequency = GetPerformanceCounterProperties (NULL, NULL);\r | |
194 | \r | |
195 | //\r | |
196 | // Ticks\r | |
197 | // Time = --------- x 1,000,000,000\r | |
198 | // Frequency\r | |
199 | //\r | |
200 | NanoSeconds = MultU64x32 (DivU64x64Remainder (Ticks, Frequency, &Remainder), 1000000000u);\r | |
201 | \r | |
202 | //\r | |
203 | // Ensure (Remainder * 1,000,000,000) will not overflow 64-bit.\r | |
204 | // Since 2^29 < 1,000,000,000 = 0x3B9ACA00 < 2^30, Remainder should < 2^(64-30) = 2^34,\r | |
205 | // i.e. highest bit set in Remainder should <= 33.\r | |
206 | //\r | |
207 | Shift = MAX (0, HighBitSet64 (Remainder) - 33);\r | |
208 | Remainder = RShiftU64 (Remainder, (UINTN) Shift);\r | |
209 | Frequency = RShiftU64 (Frequency, (UINTN) Shift);\r | |
210 | NanoSeconds += DivU64x64Remainder (MultU64x32 (Remainder, 1000000000u), Frequency, NULL);\r | |
211 | \r | |
212 | return NanoSeconds;\r | |
213 | }\r |