1 | ; Project name : Assembly Library |
---|
2 | ; Description : Tests for Assembly Library. |
---|
3 | |
---|
4 | ; |
---|
5 | ; XTIDE Universal BIOS and Associated Tools |
---|
6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team. |
---|
7 | ; |
---|
8 | ; This program is free software; you can redistribute it and/or modify |
---|
9 | ; it under the terms of the GNU General Public License as published by |
---|
10 | ; the Free Software Foundation; either version 2 of the License, or |
---|
11 | ; (at your option) any later version. |
---|
12 | ; |
---|
13 | ; This program is distributed in the hope that it will be useful, |
---|
14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
---|
16 | ; GNU General Public License for more details. |
---|
17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
---|
18 | ; |
---|
19 | |
---|
20 | ; Include .inc files |
---|
21 | %define INCLUDE_DISPLAY_LIBRARY |
---|
22 | %define INCLUDE_TIME_LIBRARY |
---|
23 | %include "AssemblyLibrary.inc" ; Assembly Library. Must be included first! |
---|
24 | |
---|
25 | |
---|
26 | ; Section containing code |
---|
27 | SECTION .text |
---|
28 | |
---|
29 | ; Program first instruction. |
---|
30 | CPU 486 |
---|
31 | ORG 100h ; Code starts at offset 100h (DOS .COM) |
---|
32 | Start: |
---|
33 | jmp BusMeasurements_Start |
---|
34 | |
---|
35 | ; Include library sources |
---|
36 | %include "AssemblyLibrary.asm" |
---|
37 | |
---|
38 | %macro MOV_TIMING_LOOP 1 |
---|
39 | xor bx, bx ; Offset for memory transfers |
---|
40 | mov dx, OFFSET_TO_NEXT_WORD ; Must be at least 32 (Pentium Cache Line size) |
---|
41 | wbinvd ; Flush and invalidate internal cache |
---|
42 | cli ; Disable interrupts |
---|
43 | START_PRECISE_EVENT_TIMER |
---|
44 | ALIGN 8 |
---|
45 | %%ReadNextWord: |
---|
46 | mov ax, %1 ; 2 bytes |
---|
47 | add bx, dx ; 2 bytes |
---|
48 | jnc SHORT %%ReadNextWord ; 2 bytes |
---|
49 | STOP_PRECISE_EVENT_TIMER |
---|
50 | sti |
---|
51 | %endmacro |
---|
52 | |
---|
53 | |
---|
54 | ;-------------------------------------------------------------------- |
---|
55 | ; Program start |
---|
56 | ;-------------------------------------------------------------------- |
---|
57 | ALIGN JUMP_ALIGN |
---|
58 | BusMeasurements_Start: |
---|
59 | CALL_DISPLAY_LIBRARY InitializeDisplayContext |
---|
60 | xor ax, ax |
---|
61 | mov ds, ax |
---|
62 | |
---|
63 | call MeasureRegAndMemMovDurationDifferenceToAX |
---|
64 | call GetBusCycleTimeToAXfromRegAndMemMovDurationDifferenceInAX |
---|
65 | call GetBusClockRateFromCycleTimeInAX |
---|
66 | mov si, g_szBusMeasurements |
---|
67 | call PrintBusMeasurements |
---|
68 | |
---|
69 | call AssumeVlbCycleTimeToAXfromBusCycleTimeInCX |
---|
70 | call GetBusClockRateFromCycleTimeInAX |
---|
71 | mov si, g_szVlbAssumption |
---|
72 | call PrintBusMeasurements |
---|
73 | |
---|
74 | ; Exit to DOS |
---|
75 | mov ax, 4C00h ; Exit to DOS |
---|
76 | int 21h |
---|
77 | |
---|
78 | |
---|
79 | |
---|
80 | ;-------------------------------------------------------------------- |
---|
81 | ; MeasureRegAndMemMovDurationDifferenceToAX |
---|
82 | ; Parameters: |
---|
83 | ; DS: Segment for memory read tests |
---|
84 | ; Returns: |
---|
85 | ; AX: Difference in register and memory access durations |
---|
86 | ; (Precise Event Timer Ticks) |
---|
87 | ; Corrupts registers: |
---|
88 | ; BX, CX, DX |
---|
89 | ;-------------------------------------------------------------------- |
---|
90 | MeasureRegAndMemMovDurationDifferenceToAX: |
---|
91 | call SystemTimer_IntializePreciseEventTimer |
---|
92 | |
---|
93 | MOV_TIMING_LOOP bx |
---|
94 | call SystemTimer_GetPreciseEventTimerTicksToAX |
---|
95 | xchg cx, ax ; Duration now in CX |
---|
96 | |
---|
97 | MOV_TIMING_LOOP [bx] |
---|
98 | call SystemTimer_GetPreciseEventTimerTicksToAX |
---|
99 | sub ax, cx ; AX = Difference in durations |
---|
100 | sub ax, cx |
---|
101 | ret |
---|
102 | |
---|
103 | |
---|
104 | ;-------------------------------------------------------------------- |
---|
105 | ; We must divide the duration by 4 since the timing loop loads |
---|
106 | ; whole cache line (4 times the bus width) instead of single BYTE. |
---|
107 | ; |
---|
108 | ; GetBusCycleTimeToAXfromRegAndMemMovDurationDifferenceInAX |
---|
109 | ; Parameters: |
---|
110 | ; AX: Difference in register and memory access durations |
---|
111 | ; (Precise Event Timer Ticks) |
---|
112 | ; Returns: |
---|
113 | ; AX: Duration for single BYTE in nanosecs |
---|
114 | ; Corrupts registers: |
---|
115 | ; CX, DX |
---|
116 | ;-------------------------------------------------------------------- |
---|
117 | GetBusCycleTimeToAXfromRegAndMemMovDurationDifferenceInAX: |
---|
118 | mov dx, TIMER_CYCLE_TIME |
---|
119 | mul dx ; DX:AX = Duration in nanosecs |
---|
120 | mov cx, (65536 / OFFSET_TO_NEXT_WORD) * 4 |
---|
121 | div cx ; AX = Duration for single BYTE in nanosecs |
---|
122 | ret |
---|
123 | |
---|
124 | |
---|
125 | ;-------------------------------------------------------------------- |
---|
126 | ; GetBusClockRateFromCycleTimeInAX |
---|
127 | ; Parameters: |
---|
128 | ; AX: Bus Cycle Time in nanosecs |
---|
129 | ; Returns: |
---|
130 | ; CX: Bus Cycle Time in nanosecs |
---|
131 | ; DX: Bus Clock Rate (MHz) |
---|
132 | ; AX: Clock Rate tenths |
---|
133 | ; Corrupts registers: |
---|
134 | ; Nothing |
---|
135 | ;-------------------------------------------------------------------- |
---|
136 | GetBusClockRateFromCycleTimeInAX: |
---|
137 | xchg cx, ax |
---|
138 | xor dx, dx |
---|
139 | mov ax, 1000 |
---|
140 | div cl ; AL = MHz, AH = Remainder |
---|
141 | xchg al, dl ; DX = Bus Clock Rate, AL = 0 |
---|
142 | aad ; AX = 10 * AH (+AL) |
---|
143 | div cl |
---|
144 | xor ah, ah ; AX = Tenths |
---|
145 | ret |
---|
146 | |
---|
147 | |
---|
148 | ;-------------------------------------------------------------------- |
---|
149 | ; AssumeVlbCycleTimeToAXfromBusCycleTimeInCX |
---|
150 | ; Parameters: |
---|
151 | ; CX: Bus Cycle Time in nanosecs |
---|
152 | ; Returns: |
---|
153 | ; AX: Assumed VLB Cycle Time in nanosecs |
---|
154 | ; Corrupts registers: |
---|
155 | ; Nothing |
---|
156 | ;-------------------------------------------------------------------- |
---|
157 | AssumeVlbCycleTimeToAXfromBusCycleTimeInCX: |
---|
158 | mov ax, cx |
---|
159 | cmp al, 24 ; 25 = 40 MHz |
---|
160 | jb SHORT .AssumePentiumSoDivideBy2 |
---|
161 | ret |
---|
162 | .AssumePentiumSoDivideBy2: |
---|
163 | shr ax, 1 |
---|
164 | ret |
---|
165 | |
---|
166 | |
---|
167 | ;-------------------------------------------------------------------- |
---|
168 | ; PrintBusMeasurements |
---|
169 | ; Parameters: |
---|
170 | ; CX: Bus Cycle Time in nanosecs |
---|
171 | ; DX: Bus Clock Rate (MHz) |
---|
172 | ; AX: Clock Rate tenths |
---|
173 | ; SI: Offset to string to format |
---|
174 | ; Returns: |
---|
175 | ; Nothing |
---|
176 | ; Corrupts registers: |
---|
177 | ; AX, DX, BP |
---|
178 | ;-------------------------------------------------------------------- |
---|
179 | PrintBusMeasurements: |
---|
180 | mov bp, sp |
---|
181 | push cx |
---|
182 | push dx |
---|
183 | push ax |
---|
184 | JMP_DISPLAY_LIBRARY FormatNullTerminatedStringFromCSSI |
---|
185 | |
---|
186 | |
---|
187 | |
---|
188 | ; Section containing initialized data |
---|
189 | SECTION .data |
---|
190 | |
---|
191 | OFFSET_TO_NEXT_WORD EQU 32 ; Must be at least 32 (Pentium Cache Line size) |
---|
192 | |
---|
193 | g_szBusMeasurements: |
---|
194 | db "Detected bus cycle time of %u ns (%u.%u MHz) ",LF,CR,NULL |
---|
195 | g_szVlbAssumption: |
---|
196 | db "Assuming VLB (if exists) cycle time of %u ns (%u.%u MHz) ",LF,CR,NULL |
---|
197 | g_szDashForZero: db "- ",NULL |
---|
198 | |
---|
199 | |
---|
200 | |
---|
201 | ; Section containing uninitialized data |
---|
202 | SECTION .bss |
---|