]>
Commit | Line | Data |
---|---|---|
878ddf1f | 1 | /** @file\r |
2 | Timer Library functions built upon local APIC on IA32/x64.\r | |
3 | \r | |
4 | @bug Should use PCD to retrieve all the constants including index of\r | |
5 | the IA32_APIC_BASE MSR, the offsets of InitialCount, CorrentCount\r | |
6 | and DivideConfiguration.\r | |
7 | \r | |
8 | Copyright (c) 2006, Intel Corporation<BR>\r | |
9 | All rights reserved. This program and the accompanying materials\r | |
10 | are licensed and made available under the terms and conditions of the BSD License\r | |
11 | which accompanies this distribution. The full text of the license may be found at\r | |
12 | http://opensource.org/licenses/bsd-license.php\r | |
13 | \r | |
14 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
15 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
16 | \r | |
17 | Module Name: IpfTimerLib.c\r | |
18 | \r | |
19 | **/\r | |
20 | \r | |
878ddf1f | 21 | typedef struct {\r |
22 | UINT64 Status;\r | |
23 | UINT64 r9;\r | |
24 | UINT64 r10;\r | |
25 | UINT64 r11;\r | |
26 | } PAL_PROC_RETURN;\r | |
27 | \r | |
ed384ef3 | 28 | /**\r |
29 | Performs a PAL call using static calling convention.\r | |
30 | \r | |
31 | An internal function to perform a PAL call using static calling convention.\r | |
32 | \r | |
33 | @param PalEntryPoint The entry point address of PAL. The address in ar.kr5\r | |
34 | would be used if this parameter were NULL on input.\r | |
35 | @param Arg1 The first argument of a PAL call.\r | |
36 | @param Arg1 The second argument of a PAL call.\r | |
37 | @param Arg1 The third argument of a PAL call.\r | |
38 | @param Arg1 The fourth argument of a PAL call.\r | |
39 | \r | |
40 | @return The values returned in r8, r9, r10 and r11.\r | |
41 | \r | |
42 | **/\r | |
878ddf1f | 43 | PAL_PROC_RETURN\r |
e65e8d10 | 44 | PalCallStatic (\r |
45 | IN CONST VOID *PalEntryPoint,\r | |
878ddf1f | 46 | IN UINT64 Arg1,\r |
47 | IN UINT64 Arg2,\r | |
48 | IN UINT64 Arg3,\r | |
49 | IN UINT64 Arg4\r | |
50 | );\r | |
51 | \r | |
ed384ef3 | 52 | /**\r |
53 | Returns the current value of ar.itc.\r | |
54 | \r | |
55 | An internal function to return the current value of ar.itc, which is the\r | |
56 | timer tick on IPF.\r | |
57 | \r | |
58 | @return The currect value of ar.itc\r | |
59 | \r | |
60 | **/\r | |
61 | INT64\r | |
62 | InternalIpfReadItc (\r | |
63 | VOID\r | |
64 | );\r | |
65 | \r | |
66 | /**\r | |
67 | Performs a delay measured as number of ticks.\r | |
68 | \r | |
69 | An internal function to perform a delay measured as number of ticks. It's\r | |
70 | invoked by MicroSecondDelay() and NanoSecondDelay().\r | |
71 | \r | |
72 | @param Delay Number of ticks to delay.\r | |
73 | \r | |
74 | **/\r | |
75 | STATIC\r | |
76 | VOID\r | |
77 | InternalIpfDelay (\r | |
78 | IN INT64 Delay\r | |
79 | )\r | |
80 | {\r | |
81 | INT64 Ticks;\r | |
82 | \r | |
83 | //\r | |
84 | // The target timer count is calculated here\r | |
85 | //\r | |
86 | Ticks = InternalIpfReadItc () + Delay;\r | |
87 | \r | |
88 | //\r | |
89 | // Wait until time out\r | |
90 | // Delay > 2^63 could not be handled by this function\r | |
91 | // Timer wrap-arounds are handled correctly by this function\r | |
92 | //\r | |
93 | while (Ticks - InternalIpfReadItc () >= 0);\r | |
94 | }\r | |
95 | \r | |
878ddf1f | 96 | /**\r |
97 | Stalls the CPU for at least the given number of microseconds.\r | |
98 | \r | |
99 | Stalls the CPU for the number of microseconds specified by MicroSeconds.\r | |
100 | \r | |
101 | @param MicroSeconds The minimum number of microseconds to delay.\r | |
102 | \r | |
ed384ef3 | 103 | @return MicroSeconds\r |
878ddf1f | 104 | \r |
105 | **/\r | |
106 | UINTN\r | |
107 | EFIAPI\r | |
108 | MicroSecondDelay (\r | |
109 | IN UINTN MicroSeconds\r | |
110 | )\r | |
111 | {\r | |
ed384ef3 | 112 | InternalIpfDelay (\r |
113 | GetPerformanceCounterProperties (NULL, NULL) *\r | |
114 | MicroSeconds /\r | |
115 | 1000000\r | |
116 | );\r | |
117 | return MicroSeconds;\r | |
878ddf1f | 118 | }\r |
119 | \r | |
120 | /**\r | |
121 | Stalls the CPU for at least the given number of nanoseconds.\r | |
122 | \r | |
123 | Stalls the CPU for the number of nanoseconds specified by NanoSeconds.\r | |
124 | \r | |
125 | @param NanoSeconds The minimum number of nanoseconds to delay.\r | |
126 | \r | |
ed384ef3 | 127 | @return NanoSeconds\r |
878ddf1f | 128 | \r |
129 | **/\r | |
130 | UINTN\r | |
131 | EFIAPI\r | |
132 | NanoSecondDelay (\r | |
133 | IN UINTN NanoSeconds\r | |
134 | )\r | |
135 | {\r | |
ed384ef3 | 136 | InternalIpfDelay (\r |
137 | GetPerformanceCounterProperties (NULL, NULL) *\r | |
138 | NanoSeconds /\r | |
139 | 1000000000\r | |
140 | );\r | |
141 | return NanoSeconds;\r | |
878ddf1f | 142 | }\r |
143 | \r | |
144 | /**\r | |
145 | Retrieves the current value of a 64-bit free running performance counter.\r | |
146 | \r | |
147 | Retrieves the current value of a 64-bit free running performance counter. The\r | |
148 | counter can either count up by 1 or count down by 1. If the physical\r | |
149 | performance counter counts by a larger increment, then the counter values\r | |
150 | must be translated. The properties of the counter can be retrieved from\r | |
151 | GetPerformanceCounterProperties().\r | |
152 | \r | |
153 | @return The current value of the free running performance counter.\r | |
154 | \r | |
155 | **/\r | |
156 | UINT64\r | |
157 | EFIAPI\r | |
158 | GetPerformanceCounter (\r | |
159 | VOID\r | |
160 | )\r | |
161 | {\r | |
ed384ef3 | 162 | return InternalIpfReadItc ();\r |
878ddf1f | 163 | }\r |
164 | \r | |
165 | /**\r | |
166 | Retrieves the 64-bit frequency in Hz and the range of performance counter\r | |
167 | values.\r | |
168 | \r | |
169 | If StartValue is not NULL, then the value that the performance counter starts\r | |
170 | with immediately after is it rolls over is returned in StartValue. If\r | |
171 | EndValue is not NULL, then the value that the performance counter end with\r | |
172 | immediately before it rolls over is returned in EndValue. The 64-bit\r | |
173 | frequency of the performance counter in Hz is always returned. If StartValue\r | |
174 | is less than EndValue, then the performance counter counts up. If StartValue\r | |
175 | is greater than EndValue, then the performance counter counts down. For\r | |
176 | example, a 64-bit free running counter that counts up would have a StartValue\r | |
177 | of 0 and an EndValue of 0xFFFFFFFFFFFFFFFF. A 24-bit free running counter\r | |
178 | that counts down would have a StartValue of 0xFFFFFF and an EndValue of 0.\r | |
179 | \r | |
180 | @param StartValue The value the performance counter starts with when it\r | |
181 | rolls over.\r | |
182 | @param EndValue The value that the performance counter ends with before\r | |
183 | it rolls over.\r | |
184 | \r | |
185 | @return The frequency in Hz.\r | |
186 | \r | |
187 | **/\r | |
188 | UINT64\r | |
189 | EFIAPI\r | |
190 | GetPerformanceCounterProperties (\r | |
191 | IN UINT64 *StartValue,\r | |
192 | IN UINT64 *EndValue\r | |
193 | )\r | |
194 | {\r | |
195 | PAL_PROC_RETURN PalRet;\r | |
196 | UINT64 BaseFrequence;\r | |
197 | \r | |
e65e8d10 | 198 | PalRet = PalCallStatic (NULL, 13, 0, 0, 0);\r |
878ddf1f | 199 | ASSERT (PalRet.Status == 0);\r |
200 | BaseFrequence = PalRet.r9;\r | |
201 | \r | |
e65e8d10 | 202 | PalRet = PalCallStatic (NULL, 14, 0, 0, 0);\r |
878ddf1f | 203 | ASSERT (PalRet.Status == 0);\r |
204 | \r | |
ed384ef3 | 205 | if (StartValue != NULL) {\r |
206 | *StartValue = 0;\r | |
207 | }\r | |
208 | \r | |
209 | if (EndValue != NULL) {\r | |
210 | *EndValue = (UINT64)(-1);\r | |
211 | }\r | |
212 | \r | |
878ddf1f | 213 | return BaseFrequence * (PalRet.r11 >> 32) / (UINT32)PalRet.r11;\r |
214 | }\r |