[256] | 1 | ; Project name : Assembly Library |
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| 2 | ; Description : Tests for Assembly Library. |
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| 3 | |
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[376] | 4 | ; |
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[505] | 5 | ; XTIDE Universal BIOS and Associated Tools |
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[526] | 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
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[376] | 7 | ; |
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| 8 | ; This program is free software; you can redistribute it and/or modify |
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| 9 | ; it under the terms of the GNU General Public License as published by |
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| 10 | ; the Free Software Foundation; either version 2 of the License, or |
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| 11 | ; (at your option) any later version. |
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[505] | 12 | ; |
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[376] | 13 | ; This program is distributed in the hope that it will be useful, |
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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[505] | 16 | ; GNU General Public License for more details. |
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[376] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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[505] | 18 | ; |
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[376] | 19 | |
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[256] | 20 | ; Include .inc files |
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| 21 | %define INCLUDE_DISPLAY_LIBRARY |
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| 22 | %define INCLUDE_TIME_LIBRARY |
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| 23 | %include "AssemblyLibrary.inc" ; Assembly Library. Must be included first! |
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| 24 | |
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| 25 | |
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| 26 | ; Section containing code |
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| 27 | SECTION .text |
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| 28 | |
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| 29 | ; Program first instruction. |
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[287] | 30 | CPU 486 |
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[256] | 31 | ORG 100h ; Code starts at offset 100h (DOS .COM) |
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| 32 | Start: |
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[287] | 33 | jmp BusMeasurements_Start |
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[256] | 34 | |
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| 35 | ; Include library sources |
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| 36 | %include "AssemblyLibrary.asm" |
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| 37 | |
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[287] | 38 | %macro MOV_TIMING_LOOP 1 |
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| 39 | xor bx, bx ; Offset for memory transfers |
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| 40 | mov dx, OFFSET_TO_NEXT_WORD ; Must be at least 32 (Pentium Cache Line size) |
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| 41 | wbinvd ; Flush and invalidate internal cache |
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| 42 | cli ; Disable interrupts |
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| 43 | START_PRECISE_EVENT_TIMER |
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| 44 | ALIGN 8 |
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| 45 | %%ReadNextWord: |
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| 46 | mov ax, %1 ; 2 bytes |
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| 47 | add bx, dx ; 2 bytes |
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| 48 | jnc SHORT %%ReadNextWord ; 2 bytes |
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| 49 | STOP_PRECISE_EVENT_TIMER |
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| 50 | sti |
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| 51 | %endmacro |
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[256] | 52 | |
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[287] | 53 | |
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[256] | 54 | ;-------------------------------------------------------------------- |
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| 55 | ; Program start |
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| 56 | ;-------------------------------------------------------------------- |
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| 57 | ALIGN JUMP_ALIGN |
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[287] | 58 | BusMeasurements_Start: |
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[256] | 59 | CALL_DISPLAY_LIBRARY InitializeDisplayContext |
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[287] | 60 | xor ax, ax |
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| 61 | mov ds, ax |
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[256] | 62 | |
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[287] | 63 | call MeasureRegAndMemMovDurationDifferenceToAX |
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| 64 | call GetBusCycleTimeToAXfromRegAndMemMovDurationDifferenceInAX |
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| 65 | call GetBusClockRateFromCycleTimeInAX |
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| 66 | mov si, g_szBusMeasurements |
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| 67 | call PrintBusMeasurements |
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[256] | 68 | |
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[287] | 69 | call AssumeVlbCycleTimeToAXfromBusCycleTimeInCX |
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| 70 | call GetBusClockRateFromCycleTimeInAX |
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| 71 | mov si, g_szVlbAssumption |
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| 72 | call PrintBusMeasurements |
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[256] | 73 | |
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| 74 | ; Exit to DOS |
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| 75 | mov ax, 4C00h ; Exit to DOS |
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| 76 | int 21h |
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| 77 | |
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| 78 | |
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[287] | 79 | |
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| 80 | ;-------------------------------------------------------------------- |
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| 81 | ; MeasureRegAndMemMovDurationDifferenceToAX |
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| 82 | ; Parameters: |
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| 83 | ; DS: Segment for memory read tests |
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| 84 | ; Returns: |
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| 85 | ; AX: Difference in register and memory access durations |
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| 86 | ; (Precise Event Timer Ticks) |
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| 87 | ; Corrupts registers: |
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| 88 | ; BX, CX, DX |
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| 89 | ;-------------------------------------------------------------------- |
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| 90 | MeasureRegAndMemMovDurationDifferenceToAX: |
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| 91 | call SystemTimer_IntializePreciseEventTimer |
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| 92 | |
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| 93 | MOV_TIMING_LOOP bx |
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| 94 | call SystemTimer_GetPreciseEventTimerTicksToAX |
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| 95 | xchg cx, ax ; Duration now in CX |
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| 96 | |
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| 97 | MOV_TIMING_LOOP [bx] |
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| 98 | call SystemTimer_GetPreciseEventTimerTicksToAX |
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| 99 | sub ax, cx ; AX = Difference in durations |
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| 100 | sub ax, cx |
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| 101 | ret |
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| 102 | |
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| 103 | |
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| 104 | ;-------------------------------------------------------------------- |
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| 105 | ; We must divide the duration by 4 since the timing loop loads |
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| 106 | ; whole cache line (4 times the bus width) instead of single BYTE. |
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| 107 | ; |
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| 108 | ; GetBusCycleTimeToAXfromRegAndMemMovDurationDifferenceInAX |
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| 109 | ; Parameters: |
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| 110 | ; AX: Difference in register and memory access durations |
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[505] | 111 | ; (Precise Event Timer Ticks) |
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[287] | 112 | ; Returns: |
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| 113 | ; AX: Duration for single BYTE in nanosecs |
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| 114 | ; Corrupts registers: |
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| 115 | ; CX, DX |
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| 116 | ;-------------------------------------------------------------------- |
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| 117 | GetBusCycleTimeToAXfromRegAndMemMovDurationDifferenceInAX: |
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| 118 | mov dx, TIMER_CYCLE_TIME |
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| 119 | mul dx ; DX:AX = Duration in nanosecs |
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| 120 | mov cx, (65536 / OFFSET_TO_NEXT_WORD) * 4 |
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| 121 | div cx ; AX = Duration for single BYTE in nanosecs |
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| 122 | ret |
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| 123 | |
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| 124 | |
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| 125 | ;-------------------------------------------------------------------- |
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| 126 | ; GetBusClockRateFromCycleTimeInAX |
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| 127 | ; Parameters: |
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| 128 | ; AX: Bus Cycle Time in nanosecs |
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| 129 | ; Returns: |
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| 130 | ; CX: Bus Cycle Time in nanosecs |
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| 131 | ; DX: Bus Clock Rate (MHz) |
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| 132 | ; AX: Clock Rate tenths |
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| 133 | ; Corrupts registers: |
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| 134 | ; Nothing |
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| 135 | ;-------------------------------------------------------------------- |
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| 136 | GetBusClockRateFromCycleTimeInAX: |
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| 137 | xchg cx, ax |
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| 138 | xor dx, dx |
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| 139 | mov ax, 1000 |
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| 140 | div cl ; AL = MHz, AH = Remainder |
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| 141 | xchg al, dl ; DX = Bus Clock Rate, AL = 0 |
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| 142 | aad ; AX = 10 * AH (+AL) |
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| 143 | div cl |
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| 144 | xor ah, ah ; AX = Tenths |
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| 145 | ret |
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| 146 | |
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| 147 | |
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| 148 | ;-------------------------------------------------------------------- |
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| 149 | ; AssumeVlbCycleTimeToAXfromBusCycleTimeInCX |
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| 150 | ; Parameters: |
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| 151 | ; CX: Bus Cycle Time in nanosecs |
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| 152 | ; Returns: |
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| 153 | ; AX: Assumed VLB Cycle Time in nanosecs |
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| 154 | ; Corrupts registers: |
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| 155 | ; Nothing |
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| 156 | ;-------------------------------------------------------------------- |
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| 157 | AssumeVlbCycleTimeToAXfromBusCycleTimeInCX: |
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| 158 | mov ax, cx |
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| 159 | cmp al, 24 ; 25 = 40 MHz |
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| 160 | jb SHORT .AssumePentiumSoDivideBy2 |
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| 161 | ret |
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| 162 | .AssumePentiumSoDivideBy2: |
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| 163 | shr ax, 1 |
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| 164 | ret |
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| 165 | |
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| 166 | |
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| 167 | ;-------------------------------------------------------------------- |
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| 168 | ; PrintBusMeasurements |
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| 169 | ; Parameters: |
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| 170 | ; CX: Bus Cycle Time in nanosecs |
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| 171 | ; DX: Bus Clock Rate (MHz) |
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| 172 | ; AX: Clock Rate tenths |
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| 173 | ; SI: Offset to string to format |
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| 174 | ; Returns: |
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| 175 | ; Nothing |
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| 176 | ; Corrupts registers: |
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| 177 | ; AX, DX, BP |
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| 178 | ;-------------------------------------------------------------------- |
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| 179 | PrintBusMeasurements: |
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[256] | 180 | mov bp, sp |
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[287] | 181 | push cx |
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| 182 | push dx |
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[256] | 183 | push ax |
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[505] | 184 | JMP_DISPLAY_LIBRARY FormatNullTerminatedStringFromCSSI |
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[256] | 185 | |
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| 186 | |
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| 187 | |
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| 188 | ; Section containing initialized data |
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| 189 | SECTION .data |
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| 190 | |
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[287] | 191 | OFFSET_TO_NEXT_WORD EQU 32 ; Must be at least 32 (Pentium Cache Line size) |
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[256] | 192 | |
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[287] | 193 | g_szBusMeasurements: |
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| 194 | db "Detected bus cycle time of %u ns (%u.%u MHz) ",LF,CR,NULL |
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| 195 | g_szVlbAssumption: |
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| 196 | db "Assuming VLB (if exists) cycle time of %u ns (%u.%u MHz) ",LF,CR,NULL |
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[256] | 197 | g_szDashForZero: db "- ",NULL |
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| 198 | |
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| 199 | |
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| 200 | |
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| 201 | ; Section containing uninitialized data |
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| 202 | SECTION .bss |
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