UbixOS V2 2.0

timer.S
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1 /*-
2 * Copyright (c) 2002-2018 The UbixOS Project.
3 * All rights reserved.
4 *
5 * This was developed by Christopher W. Olsen for the UbixOS Project.
6 *
7 * Redistribution and use in source and binary forms, with or without modification, are permitted
8 * provided that the following conditions are met:
9 *
10 * 1) Redistributions of source code must retain the above copyright notice, this list of
11 * conditions, the following disclaimer and the list of authors.
12 * 2) Redistributions in binary form must reproduce the above copyright notice, this list of
13 * conditions, the following disclaimer and the list of authors in the documentation and/or
14 * other materials provided with the distribution.
15 * 3) Neither the name of the UbixOS Project nor the names of its contributors may be used to
16 * endorse or promote products derived from this software without specific prior written
17 * permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
20 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
24 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 .globl timerInt
30 .text
31 .code32
32 timerInt:
33 pusha /* Save all of the registers */
34 mov $0x20,%dx /* The Following Sends Our EOI To The MPIC */
35 mov $0x20,%ax
36 outb %al,%dx
37 movl systemVitals,%ecx /* Put Location Of System Vitals Into ECX */
38 incl (%ecx) /* Increment sysTicks our 1000ms counter */
39 movl (%ecx),%eax /* Increment our sysUptime by 1S if 1000MS */
40 movl $200,%ebx /* Have Passed */
41 xor %edx,%edx
42 div %ebx
43 test %edx,%edx
44 jnz next
45 incl 4(%ecx)
46 next:
47 movl (%ecx),%eax /* Test If quantum Has Passed If So Then */
48 movl 8(%ecx),%ebx /* We Can CALL sched */
49 xor %edx,%edx
50 div %ebx
51 test %edx,%edx
52 jnz done
53 /*
54 push %ds
55 push %es
56 push %fs
57 push %gs
58 mov $0x10,%eax
59 mov %eax, %ds
60 mov %eax, %es
61 mov %eax, %fs
62 cld
63 */
64 /* push %esp */
65 call sched
66 /* add $0x4,%esp */ /* Remove Stack Pointer From Stack */
67 /*
68 pop %gs
69 pop %fs
70 pop %es
71 pop %ds
72 */
73 done:
74 popa /* Restore Registers */
75 iret