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863be5d0 | 1 | /** @file\r |
2 | This library implements the Timer Library using the Extended SAL Stall Services Class.\r | |
3 | \r | |
4 | Copyright (c) 2007 - 2011, Intel Corporation. All rights reserved.<BR>\r | |
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 <PiDxe.h>\r | |
16 | \r | |
17 | #include <Protocol/ExtendedSalServiceClasses.h>\r | |
18 | \r | |
19 | #include <Library/TimerLib.h>\r | |
20 | #include <Library/BaseLib.h>\r | |
21 | #include <Library/ExtendedSalLib.h>\r | |
22 | #include <Library/DebugLib.h>\r | |
23 | #include <Library/PalLib.h>\r | |
24 | \r | |
25 | /**\r | |
26 | Stalls the CPU for at least the given number of microseconds.\r | |
27 | \r | |
28 | This function wraps EsalStall function of Extended SAL Stall Services Class.\r | |
29 | It stalls the CPU for the number of microseconds specified by MicroSeconds.\r | |
30 | \r | |
31 | @param MicroSeconds The minimum number of microseconds to delay.\r | |
32 | \r | |
33 | @return MicroSeconds\r | |
34 | \r | |
35 | **/\r | |
36 | UINTN\r | |
37 | EFIAPI\r | |
38 | MicroSecondDelay (\r | |
39 | IN UINTN MicroSeconds\r | |
40 | )\r | |
41 | {\r | |
42 | EsalCall (\r | |
43 | EFI_EXTENDED_SAL_STALL_SERVICES_PROTOCOL_GUID_LO,\r | |
44 | EFI_EXTENDED_SAL_STALL_SERVICES_PROTOCOL_GUID_HI,\r | |
45 | StallFunctionId, \r | |
46 | MicroSeconds, \r | |
47 | 0, \r | |
48 | 0, \r | |
49 | 0, \r | |
50 | 0, \r | |
51 | 0, \r | |
52 | 0\r | |
53 | );\r | |
54 | return MicroSeconds;\r | |
55 | }\r | |
56 | \r | |
57 | /**\r | |
58 | Stalls the CPU for at least the given number of nanoseconds.\r | |
59 | \r | |
60 | This function wraps EsalStall function of Extended SAL Stall Services Class.\r | |
61 | It stalls the CPU for the number of nanoseconds specified by NanoSeconds.\r | |
62 | \r | |
63 | @param NanoSeconds The minimum number of nanoseconds to delay.\r | |
64 | \r | |
65 | @return NanoSeconds\r | |
66 | \r | |
67 | **/\r | |
68 | UINTN\r | |
69 | EFIAPI\r | |
70 | NanoSecondDelay (\r | |
71 | IN UINTN NanoSeconds\r | |
72 | )\r | |
73 | {\r | |
74 | UINT64 MicroSeconds;\r | |
75 | \r | |
76 | //\r | |
77 | // The unit of ESAL Stall service is microsecond, so we turn the time interval\r | |
78 | // from nanosecond to microsecond, using the ceiling value to ensure stalling\r | |
79 | // at least the given number of nanoseconds.\r | |
80 | //\r | |
81 | MicroSeconds = DivU64x32 (NanoSeconds + 999, 1000);\r | |
82 | EsalCall (\r | |
83 | EFI_EXTENDED_SAL_STALL_SERVICES_PROTOCOL_GUID_LO,\r | |
84 | EFI_EXTENDED_SAL_STALL_SERVICES_PROTOCOL_GUID_HI,\r | |
85 | StallFunctionId, \r | |
86 | MicroSeconds, \r | |
87 | 0, \r | |
88 | 0, \r | |
89 | 0, \r | |
90 | 0, \r | |
91 | 0, \r | |
92 | 0\r | |
93 | );\r | |
94 | return NanoSeconds;\r | |
95 | }\r | |
96 | \r | |
97 | /**\r | |
98 | Retrieves the current value of a 64-bit free running performance counter.\r | |
99 | \r | |
100 | Retrieves the current value of a 64-bit free running performance counter. The\r | |
101 | counter can either count up by 1 or count down by 1. If the physical\r | |
102 | performance counter counts by a larger increment, then the counter values\r | |
103 | must be translated. The properties of the counter can be retrieved from\r | |
104 | GetPerformanceCounterProperties().\r | |
105 | \r | |
106 | @return The current value of the free running performance counter.\r | |
107 | \r | |
108 | **/\r | |
109 | UINT64\r | |
110 | EFIAPI\r | |
111 | GetPerformanceCounter (\r | |
112 | VOID\r | |
113 | )\r | |
114 | {\r | |
115 | return AsmReadItc ();\r | |
116 | }\r | |
117 | \r | |
118 | /**\r | |
119 | Retrieves the 64-bit frequency in Hz and the range of performance counter\r | |
120 | values.\r | |
121 | \r | |
122 | If StartValue is not NULL, then the value that the performance counter starts\r | |
123 | with immediately after is it rolls over is returned in StartValue. If\r | |
124 | EndValue is not NULL, then the value that the performance counter end with\r | |
125 | immediately before it rolls over is returned in EndValue. The 64-bit\r | |
126 | frequency of the performance counter in Hz is always returned. If StartValue\r | |
127 | is less than EndValue, then the performance counter counts up. If StartValue\r | |
128 | is greater than EndValue, then the performance counter counts down. For\r | |
129 | example, a 64-bit free running counter that counts up would have a StartValue\r | |
130 | of 0 and an EndValue of 0xFFFFFFFFFFFFFFFF. A 24-bit free running counter\r | |
131 | that counts down would have a StartValue of 0xFFFFFF and an EndValue of 0.\r | |
132 | \r | |
133 | @param StartValue The value the performance counter starts with when it\r | |
134 | rolls over.\r | |
135 | @param EndValue The value that the performance counter ends with before\r | |
136 | it rolls over.\r | |
137 | \r | |
138 | @return The frequency in Hz.\r | |
139 | \r | |
140 | **/\r | |
141 | UINT64\r | |
142 | EFIAPI\r | |
143 | GetPerformanceCounterProperties (\r | |
144 | OUT UINT64 *StartValue, OPTIONAL\r | |
145 | OUT UINT64 *EndValue OPTIONAL\r | |
146 | )\r | |
147 | {\r | |
148 | PAL_CALL_RETURN PalRet;\r | |
149 | UINT64 BaseFrequence;\r | |
150 | \r | |
151 | //\r | |
152 | // Get processor base frequency\r | |
153 | //\r | |
154 | PalRet = PalCall (PAL_FREQ_BASE, 0, 0, 0);\r | |
155 | ASSERT (PalRet.Status == 0);\r | |
156 | BaseFrequence = PalRet.r9;\r | |
157 | \r | |
158 | //\r | |
159 | // Get processor frequency ratio\r | |
160 | //\r | |
161 | PalRet = PalCall (PAL_FREQ_RATIOS, 0, 0, 0);\r | |
162 | ASSERT (PalRet.Status == 0);\r | |
163 | \r | |
164 | //\r | |
165 | // Start value of counter is 0\r | |
166 | //\r | |
167 | if (StartValue != NULL) {\r | |
168 | *StartValue = 0;\r | |
169 | }\r | |
170 | \r | |
171 | //\r | |
172 | // End value of counter is 0xFFFFFFFFFFFFFFFF\r | |
173 | //\r | |
174 | if (EndValue != NULL) {\r | |
175 | *EndValue = (UINT64)(-1);\r | |
176 | }\r | |
177 | \r | |
178 | return BaseFrequence * (PalRet.r11 >> 32) / (UINT32)PalRet.r11;\r | |
179 | }\r | |
16a48731 | 180 | \r |
181 | /**\r | |
182 | Converts elapsed ticks of performance counter to time in nanoseconds.\r | |
183 | \r | |
184 | This function converts the elapsed ticks of running performance counter to\r | |
185 | time value in unit of nanoseconds.\r | |
186 | \r | |
187 | @param Ticks The number of elapsed ticks of running performance counter.\r | |
188 | \r | |
189 | @return The elapsed time in nanoseconds.\r | |
190 | \r | |
191 | **/\r | |
192 | UINT64\r | |
193 | EFIAPI\r | |
194 | GetTimeInNanoSecond (\r | |
195 | IN UINT64 Ticks\r | |
196 | )\r | |
197 | {\r | |
198 | UINT64 Frequency;\r | |
199 | UINT64 NanoSeconds;\r | |
200 | UINT64 Remainder;\r | |
201 | INTN Shift;\r | |
202 | \r | |
203 | Frequency = GetPerformanceCounterProperties (NULL, NULL);\r | |
204 | \r | |
205 | //\r | |
206 | // Ticks\r | |
207 | // Time = --------- x 1,000,000,000\r | |
208 | // Frequency\r | |
209 | //\r | |
210 | NanoSeconds = MultU64x32 (DivU64x64Remainder (Ticks, Frequency, &Remainder), 1000000000u);\r | |
211 | \r | |
212 | //\r | |
213 | // Ensure (Remainder * 1,000,000,000) will not overflow 64-bit.\r | |
214 | // Since 2^29 < 1,000,000,000 = 0x3B9ACA00 < 2^30, Remainder should < 2^(64-30) = 2^34,\r | |
215 | // i.e. highest bit set in Remainder should <= 33.\r | |
216 | //\r | |
217 | Shift = MAX (0, HighBitSet64 (Remainder) - 33);\r | |
218 | Remainder = RShiftU64 (Remainder, (UINTN) Shift);\r | |
219 | Frequency = RShiftU64 (Frequency, (UINTN) Shift);\r | |
220 | NanoSeconds += DivU64x64Remainder (MultU64x32 (Remainder, 1000000000u), Frequency, NULL);\r | |
221 | \r | |
222 | return NanoSeconds;\r | |
223 | }\r |