VirtualBox

source: vbox/trunk/src/VBox/ValidationKit/bootsectors/bs3-timers-1-x0.c@ 90780

Last change on this file since 90780 was 88839, checked in by vboxsync, 4 years ago

ValKit: Added bs3-timers-1 for some quick PIT testing.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 3.1 KB
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1/* $Id: bs3-timers-1-x0.c 88839 2021-05-03 14:28:49Z vboxsync $ */
2/** @file
3 * BS3Kit - bs3-timers-1, C test driver code (16-bit).
4 */
5
6/*
7 * Copyright (C) 2007-2021 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 *
17 * The contents of this file may alternatively be used under the terms
18 * of the Common Development and Distribution License Version 1.0
19 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20 * VirtualBox OSE distribution, in which case the provisions of the
21 * CDDL are applicable instead of those of the GPL.
22 *
23 * You may elect to license modified versions of this file under the
24 * terms and conditions of either the GPL or the CDDL or both.
25 */
26
27
28/*********************************************************************************************************************************
29* Header Files *
30*********************************************************************************************************************************/
31#define BS3_USE_X0_TEXT_SEG
32#include <bs3kit.h>
33#include <iprt/asm.h>
34#include <iprt/asm-amd64-x86.h>
35
36
37static uint8_t bs3Timers1_Pit(uint8_t bMode, uint16_t uHz, uint32_t cNsMaxDiviation)
38{
39 uint32_t const cTargetTicks = uHz * 3;
40 uint16_t uActualHz;
41 uint64_t cNsElapsed;
42 int64_t cNsDelta;
43 uint64_t cNsDeltaAbs;
44
45 Bs3PitSetupAndEnablePeriodTimer(uHz);
46 cNsElapsed = Bs3TestNow();
47 ASMIntEnable();
48 uActualHz = g_cBs3PitIntervalHz;
49
50 while (g_cBs3PitTicks < cTargetTicks)
51 ASMHalt();
52
53 Bs3PitDisable();
54 ASMIntDisable();
55 cNsElapsed = Bs3TestNow() - cNsElapsed;
56
57 /* Calculate the absolute delta and fail the test if the diviation is too high... */
58 cNsDelta = cNsElapsed - RT_NS_1SEC * 3;
59 cNsDeltaAbs = RT_ABS(cNsDelta);
60 /*Bs3TestPrintf("cNsElapsed=%RU64 g_cBs3PitTicks=%RU32 uHz=%u -> %RU64ns\n",
61 cNsElapsed, g_cBs3PitTicks, uActualHz, cNsDeltaAbs);*/
62 if (cNsDeltaAbs > cNsMaxDiviation)
63 Bs3TestFailedF("delta %c%RU64 ns (%RI32 ms), max %RU32 ns", cNsDelta < 0 ? '-' : '+', cNsDeltaAbs,
64 (int32_t)((uint64_t)cNsDelta / RT_NS_1MS), cNsMaxDiviation);
65
66 return 0;
67}
68
69
70BS3_DECL_FAR(uint8_t) BS3_CMN_FAR_NM(bs3Timers1_Pit_100Hz)(uint8_t bMode)
71{
72 return bs3Timers1_Pit(bMode, 100, RT_NS_10MS);
73}
74
75
76BS3_DECL_FAR(uint8_t) BS3_CMN_FAR_NM(bs3Timers1_Pit_1000Hz)(uint8_t bMode)
77{
78 return bs3Timers1_Pit(bMode, 1000, RT_NS_10MS);
79}
80
81
82BS3_DECL_FAR(uint8_t) BS3_CMN_FAR_NM(bs3Timers1_Pit_2000Hz)(uint8_t bMode)
83{
84 return bs3Timers1_Pit(bMode, 2000, RT_NS_10MS*2);
85}
86
87
88BS3_DECL_FAR(uint8_t) BS3_CMN_FAR_NM(bs3Timers1_Pit_4000Hz)(uint8_t bMode)
89{
90 return bs3Timers1_Pit(bMode, 4000, RT_NS_10MS*4);
91}
92
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