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git.proxmox.com Git - mirror_edk2.git/blob - EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseTimerLibLocalApic/Ipf/IpfTimerLib.c
3 Copyright (c) 2004 - 2006, Intel Corporation
4 All rights reserved. This program and the accompanying materials
5 are licensed and made available under the terms and conditions of the BSD License
6 which accompanies this distribution. The full text of the license may be found at
7 http://opensource.org/licenses/bsd-license.php
9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
19 Timer Library functions built upon local APIC on IA32/x64.
21 @bug Should use PCD to retrieve all the constants including index of
22 the IA32_APIC_BASE MSR, the offsets of InitialCount, CorrentCount
23 and DivideConfiguration.
27 #include "EdkIIGlueBase.h"
31 Performs a delay measured as number of ticks.
33 An internal function to perform a delay measured as number of ticks. It's
34 invoked by MicroSecondDelay() and NanoSecondDelay().
36 @param Delay Number of ticks to delay.
48 // The target timer count is calculated here
50 Ticks
= (INT64
)AsmReadItc () + Delay
;
53 // Wait until time out
54 // Delay > 2^63 could not be handled by this function
55 // Timer wrap-arounds are handled correctly by this function
57 while (Ticks
- (INT64
)AsmReadItc() >= 0);
61 Stalls the CPU for at least the given number of microseconds.
63 Stalls the CPU for the number of microseconds specified by MicroSeconds.
65 @param MicroSeconds The minimum number of microseconds to delay.
77 GetPerformanceCounterProperties (NULL
, NULL
) *
85 Stalls the CPU for at least the given number of nanoseconds.
87 Stalls the CPU for the number of nanoseconds specified by NanoSeconds.
89 @param NanoSeconds The minimum number of nanoseconds to delay.
101 GetPerformanceCounterProperties (NULL
, NULL
) *
109 Retrieves the current value of a 64-bit free running performance counter.
111 Retrieves the current value of a 64-bit free running performance counter. The
112 counter can either count up by 1 or count down by 1. If the physical
113 performance counter counts by a larger increment, then the counter values
114 must be translated. The properties of the counter can be retrieved from
115 GetPerformanceCounterProperties().
117 @return The current value of the free running performance counter.
122 GetPerformanceCounter (
126 return AsmReadItc ();
130 Retrieves the 64-bit frequency in Hz and the range of performance counter
133 If StartValue is not NULL, then the value that the performance counter starts
134 with immediately after is it rolls over is returned in StartValue. If
135 EndValue is not NULL, then the value that the performance counter end with
136 immediately before it rolls over is returned in EndValue. The 64-bit
137 frequency of the performance counter in Hz is always returned. If StartValue
138 is less than EndValue, then the performance counter counts up. If StartValue
139 is greater than EndValue, then the performance counter counts down. For
140 example, a 64-bit free running counter that counts up would have a StartValue
141 of 0 and an EndValue of 0xFFFFFFFFFFFFFFFF. A 24-bit free running counter
142 that counts down would have a StartValue of 0xFFFFFF and an EndValue of 0.
144 @param StartValue The value the performance counter starts with when it
146 @param EndValue The value that the performance counter ends with before
149 @return The frequency in Hz.
154 GetPerformanceCounterProperties (
155 OUT UINT64
*StartValue
, OPTIONAL
156 OUT UINT64
*EndValue OPTIONAL
159 PAL_CALL_RETURN PalRet
;
160 UINT64 BaseFrequence
;
162 PalRet
= PalCallStatic (NULL
, 13, 0, 0, 0);
163 ASSERT (PalRet
.Status
== 0);
164 BaseFrequence
= PalRet
.r9
;
166 PalRet
= PalCallStatic (NULL
, 14, 0, 0, 0);
167 ASSERT (PalRet
.Status
== 0);
169 if (StartValue
!= NULL
) {
173 if (EndValue
!= NULL
) {
174 *EndValue
= (UINT64
)(-1);
177 return BaseFrequence
* (PalRet
.r11
>> 32) / (UINT32
)PalRet
.r11
;