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[/] [eco32/] [trunk/] [binutils/] [tests-2/] [intrpt/] [intrpt.s] - Blame information for rev 128

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;
; intrpt.s -- a first attempt to utilize interrupts
;
 
        .set    stack,0xC0010000        ; stack
        .set    timerbase,0xF0000000    ; timer base address
        .set    termbase,0xF0300000     ; terminal base address
 
reset:
        j       start           ; reset arrives here
 
intrpt:
        j       isr             ; interrupts arrive here
 
userMiss:
        j       userMiss        ; user TLB miss exceptions arrive here
 
isr:
        mvfs    $26,0            ; determine cause
        slr     $26,$26,14      ; $26 = 4 * IRQ number
        and     $26,$26,0x1F << 2
        ldw     $26,$26,irqsrv  ; get addr of service routine
        jr      $26             ; jump to service routine
 
start:
        add     $29,$0,stack     ; set sp
        add     $4,$0,runmsg     ; pointer to string
        jal     msg             ; show string
        add     $8,$0,timerbase  ; program timer
        add     $9,$0,1000       ; divisor = 1000
        stw     $9,$8,4
        add     $9,$0,2          ; enable timer interrupts
        stw     $9,$8,0
        mvfs    $8,0
        or      $8,$8,1 << 14   ; open timer IRQ mask bit
        or      $8,$8,1 << 23   ; enable processor interrupts
        or      $8,$8,1 << 27   ; let vector point to RAM
        mvts    $8,0
start1:
        j       start1          ; loop
 
tmrisr:
        add     $8,$0,0x02       ; ien = 1, int = 0
        stw     $8,$0,timerbase
        j       shmsg
 
shmsg:
        mvfs    $8,0
        slr     $8,$8,14        ; $8 = 4 * IRQ number
        and     $8,$8,0x1F << 2
        ldw     $4,$8,msgtbl    ; get addr of message
        jal     msg             ; show message
        rfx                     ; return from exception
 
msg:
        sub     $29,$29,8       ; save registers
        stw     $31,$29,4
        stw     $16,$29,0
        add     $16,$4,$0        ; get pointer
msg1:
        ldbu    $4,$16,0 ; get char
        beq     $4,$0,msg2       ; null - finished
        jal     out             ; output char
        add     $16,$16,1       ; bump pointer
        j       msg1            ; next char
msg2:
        ldw     $16,$29,0        ; restore registers
        ldw     $31,$29,4
        add     $29,$29,8
        jr      $31             ; return
 
out:
        add     $8,$0,termbase   ; set I/O base address
out1:
        ldw     $9,$8,8         ; get status
        and     $9,$9,1         ; xmtr ready?
        beq     $9,$0,out1       ; no - wait
        stw     $4,$8,12        ; send char
        jr      $31             ; return
 
; service routine table
 
irqsrv:
        .word   shmsg           ; 00: terminal 0 transmitter interrupt
        .word   shmsg           ; 01: terminal 0 receiver interrupt
        .word   shmsg           ; 02: terminal 1 transmitter interrupt
        .word   shmsg           ; 03: terminal 1 receiver interrupt
        .word   shmsg           ; 04: keyboard interrupt
        .word   shmsg           ; 05: unused
        .word   shmsg           ; 06: unused
        .word   shmsg           ; 07: unused
        .word   shmsg           ; 08: disk interrupt
        .word   shmsg           ; 09: unused
        .word   shmsg           ; 10: unused
        .word   shmsg           ; 11: unused
        .word   shmsg           ; 12: unused
        .word   shmsg           ; 13: unused
        .word   tmrisr          ; 14: timer interrupt
        .word   shmsg           ; 15: unused
        .word   shmsg           ; 16: bus timeout exception
        .word   shmsg           ; 17: illegal instruction exception
        .word   shmsg           ; 18: privileged instruction exception
        .word   shmsg           ; 19: divide instruction exception
        .word   shmsg           ; 20: trap instruction exception
        .word   shmsg           ; 21: TLB miss exception
        .word   shmsg           ; 22: TLB write exception
        .word   shmsg           ; 23: TLB invalid exception
        .word   shmsg           ; 24: illegal address exception
        .word   shmsg           ; 25: privileged address exception
        .word   shmsg           ; 26: unused
        .word   shmsg           ; 27: unused
        .word   shmsg           ; 28: unused
        .word   shmsg           ; 29: unused
        .word   shmsg           ; 30: unused
        .word   shmsg           ; 31: unused
 
; message table
 
msgtbl:
        .word   xmtmsg          ; 00: terminal 0 transmitter interrupt
        .word   rcvmsg          ; 01: terminal 0 receiver interrupt
        .word   xmtmsg          ; 02: terminal 1 transmitter interrupt
        .word   rcvmsg          ; 03: terminal 1 receiver interrupt
        .word   kbdmsg          ; 04: keyboard interrupt
        .word   uimsg           ; 05: unused
        .word   uimsg           ; 06: unused
        .word   uimsg           ; 07: unused
        .word   dskmsg          ; 08: disk interrupt
        .word   uimsg           ; 09: unused
        .word   uimsg           ; 10: unused
        .word   uimsg           ; 11: unused
        .word   uimsg           ; 12: unused
        .word   uimsg           ; 13: unused
        .word   tmrmsg          ; 14: timer interrupt
        .word   uimsg           ; 15: unused
        .word   btmsg           ; 16: bus timeout exception
        .word   iimsg           ; 17: illegal instruction exception
        .word   pimsg           ; 18: privileged instruction exception
        .word   dimsg           ; 19: divide instruction exception
        .word   timsg           ; 20: trap instruction exception
        .word   msmsg           ; 21: TLB miss exception
        .word   wrmsg           ; 22: TLB write exception
        .word   ivmsg           ; 23: TLB invalid exception
        .word   iamsg           ; 24: illegal address exception
        .word   pamsg           ; 25: privileged address exception
        .word   uemsg           ; 26: unused
        .word   uemsg           ; 27: unused
        .word   uemsg           ; 28: unused
        .word   uemsg           ; 29: unused
        .word   uemsg           ; 30: unused
        .word   uemsg           ; 31: unused
 
; sign-on message
 
runmsg:
        .byte   "system running..."
        .byte   0x0D, 0x0A, 0
 
; interrupt messages
 
uimsg:
        .byte   "unknown interrupt"
        .byte   0x0D, 0x0A, 0
 
xmtmsg:
        .byte   "terminal transmitter interrupt"
        .byte   0x0D, 0x0A, 0
 
rcvmsg:
        .byte   "terminal receiver interrupt"
        .byte   0x0D, 0x0A, 0
 
kbdmsg:
        .byte   "keyboard interrupt"
        .byte   0x0D, 0x0A, 0
 
dskmsg:
        .byte   "disk interrupt"
        .byte   0x0D, 0x0A, 0
 
tmrmsg:
        .byte   "timer interrupt"
        .byte   0x0D, 0x0A, 0
 
; exception messages
 
uemsg:
        .byte   "unknown exception"
        .byte   0x0D, 0x0A, 0
 
btmsg:
        .byte   "bus timeout exception"
        .byte   0x0D, 0x0A, 0
 
iimsg:
        .byte   "illegal instruction exception"
        .byte   0x0D, 0x0A, 0
 
pimsg:
        .byte   "privileged instruction exception"
        .byte   0x0D, 0x0A, 0
 
dimsg:
        .byte   "divide instruction exception"
        .byte   0x0D, 0x0A, 0
 
timsg:
        .byte   "trap instruction exception"
        .byte   0x0D, 0x0A, 0
 
msmsg:
        .byte   "TLB miss exception"
        .byte   0x0D, 0x0A, 0
 
wrmsg:
        .byte   "TLB write exception"
        .byte   0x0D, 0x0A, 0
 
ivmsg:
        .byte   "TLB invalid exception"
        .byte   0x0D, 0x0A, 0
 
iamsg:
        .byte   "illegal address exception"
        .byte   0x0D, 0x0A, 0
 
pamsg:
        .byte   "privileged address exception"
        .byte   0x0D, 0x0A, 0

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[/] [eco32/] [trunk/] [binutils/] [tests-2/] [intrpt/] [intrpt.s] - Blame information for rev 128

Line No.	Rev	Author	Line
1	7	hellwig	`;`
2			`; intrpt.s -- a first attempt to utilize interrupts`
3			`;`
4
5			`.set stack,0xC0010000 ; stack`
6			`.set timerbase,0xF0000000 ; timer base address`
7			`.set termbase,0xF0300000 ; terminal base address`
8
9			`reset:`
10			`j start ; reset arrives here`
11
12			`intrpt:`
13			`j isr ; interrupts arrive here`
14
15			`userMiss:`
16			`j userMiss ; user TLB miss exceptions arrive here`
17
18			`isr:`
19			`mvfs $26,0 ; determine cause`
20			`slr $26,$26,14 ; $26 = 4 * IRQ number`
21			`and $26,$26,0x1F << 2`
22			`ldw $26,$26,irqsrv ; get addr of service routine`
23			`jr $26 ; jump to service routine`
24
25			`start:`
26			`add $29,$0,stack ; set sp`
27			`add $4,$0,runmsg ; pointer to string`
28			`jal msg ; show string`
29			`add $8,$0,timerbase ; program timer`
30			`add $9,$0,1000 ; divisor = 1000`
31			`stw $9,$8,4`
32			`add $9,$0,2 ; enable timer interrupts`
33			`stw $9,$8,0`
34			`mvfs $8,0`
35			`or $8,$8,1 << 14 ; open timer IRQ mask bit`
36			`or $8,$8,1 << 23 ; enable processor interrupts`
37			`or $8,$8,1 << 27 ; let vector point to RAM`
38			`mvts $8,0`
39			`start1:`
40			`j start1 ; loop`
41
42			`tmrisr:`
43			`add $8,$0,0x02 ; ien = 1, int = 0`
44			`stw $8,$0,timerbase`
45			`j shmsg`
46
47			`shmsg:`
48			`mvfs $8,0`
49			`slr $8,$8,14 ; $8 = 4 * IRQ number`
50			`and $8,$8,0x1F << 2`
51			`ldw $4,$8,msgtbl ; get addr of message`
52			`jal msg ; show message`
53			`rfx ; return from exception`
54
55			`msg:`
56			`sub $29,$29,8 ; save registers`
57			`stw $31,$29,4`
58			`stw $16,$29,0`
59			`add $16,$4,$0 ; get pointer`
60			`msg1:`
61			`ldbu $4,$16,0 ; get char`
62			`beq $4,$0,msg2 ; null - finished`
63			`jal out ; output char`
64			`add $16,$16,1 ; bump pointer`
65			`j msg1 ; next char`
66			`msg2:`
67			`ldw $16,$29,0 ; restore registers`
68			`ldw $31,$29,4`
69			`add $29,$29,8`
70			`jr $31 ; return`
71
72			`out:`
73			`add $8,$0,termbase ; set I/O base address`
74			`out1:`
75			`ldw $9,$8,8 ; get status`
76			`and $9,$9,1 ; xmtr ready?`
77			`beq $9,$0,out1 ; no - wait`
78			`stw $4,$8,12 ; send char`
79			`jr $31 ; return`
80
81			`; service routine table`
82
83			`irqsrv:`
84			`.word shmsg ; 00: terminal 0 transmitter interrupt`
85			`.word shmsg ; 01: terminal 0 receiver interrupt`
86			`.word shmsg ; 02: terminal 1 transmitter interrupt`
87			`.word shmsg ; 03: terminal 1 receiver interrupt`
88			`.word shmsg ; 04: keyboard interrupt`
89			`.word shmsg ; 05: unused`
90			`.word shmsg ; 06: unused`
91			`.word shmsg ; 07: unused`
92			`.word shmsg ; 08: disk interrupt`
93			`.word shmsg ; 09: unused`
94			`.word shmsg ; 10: unused`
95			`.word shmsg ; 11: unused`
96			`.word shmsg ; 12: unused`
97			`.word shmsg ; 13: unused`
98			`.word tmrisr ; 14: timer interrupt`
99			`.word shmsg ; 15: unused`
100			`.word shmsg ; 16: bus timeout exception`
101			`.word shmsg ; 17: illegal instruction exception`
102			`.word shmsg ; 18: privileged instruction exception`
103			`.word shmsg ; 19: divide instruction exception`
104			`.word shmsg ; 20: trap instruction exception`
105			`.word shmsg ; 21: TLB miss exception`
106			`.word shmsg ; 22: TLB write exception`
107			`.word shmsg ; 23: TLB invalid exception`
108			`.word shmsg ; 24: illegal address exception`
109			`.word shmsg ; 25: privileged address exception`
110			`.word shmsg ; 26: unused`
111			`.word shmsg ; 27: unused`
112			`.word shmsg ; 28: unused`
113			`.word shmsg ; 29: unused`
114			`.word shmsg ; 30: unused`
115			`.word shmsg ; 31: unused`
116
117			`; message table`
118
119			`msgtbl:`
120			`.word xmtmsg ; 00: terminal 0 transmitter interrupt`
121			`.word rcvmsg ; 01: terminal 0 receiver interrupt`
122			`.word xmtmsg ; 02: terminal 1 transmitter interrupt`
123			`.word rcvmsg ; 03: terminal 1 receiver interrupt`
124			`.word kbdmsg ; 04: keyboard interrupt`
125			`.word uimsg ; 05: unused`
126			`.word uimsg ; 06: unused`
127			`.word uimsg ; 07: unused`
128			`.word dskmsg ; 08: disk interrupt`
129			`.word uimsg ; 09: unused`
130			`.word uimsg ; 10: unused`
131			`.word uimsg ; 11: unused`
132			`.word uimsg ; 12: unused`
133			`.word uimsg ; 13: unused`
134			`.word tmrmsg ; 14: timer interrupt`
135			`.word uimsg ; 15: unused`
136			`.word btmsg ; 16: bus timeout exception`
137			`.word iimsg ; 17: illegal instruction exception`
138			`.word pimsg ; 18: privileged instruction exception`
139			`.word dimsg ; 19: divide instruction exception`
140			`.word timsg ; 20: trap instruction exception`
141			`.word msmsg ; 21: TLB miss exception`
142			`.word wrmsg ; 22: TLB write exception`
143			`.word ivmsg ; 23: TLB invalid exception`
144			`.word iamsg ; 24: illegal address exception`
145			`.word pamsg ; 25: privileged address exception`
146			`.word uemsg ; 26: unused`
147			`.word uemsg ; 27: unused`
148			`.word uemsg ; 28: unused`
149			`.word uemsg ; 29: unused`
150			`.word uemsg ; 30: unused`
151			`.word uemsg ; 31: unused`
152
153			`; sign-on message`
154
155			`runmsg:`
156			`.byte "system running..."`
157			`.byte 0x0D, 0x0A, 0`
158
159			`; interrupt messages`
160
161			`uimsg:`
162			`.byte "unknown interrupt"`
163			`.byte 0x0D, 0x0A, 0`
164
165			`xmtmsg:`
166			`.byte "terminal transmitter interrupt"`
167			`.byte 0x0D, 0x0A, 0`
168
169			`rcvmsg:`
170			`.byte "terminal receiver interrupt"`
171			`.byte 0x0D, 0x0A, 0`
172
173			`kbdmsg:`
174			`.byte "keyboard interrupt"`
175			`.byte 0x0D, 0x0A, 0`
176
177			`dskmsg:`
178			`.byte "disk interrupt"`
179			`.byte 0x0D, 0x0A, 0`
180
181			`tmrmsg:`
182			`.byte "timer interrupt"`
183			`.byte 0x0D, 0x0A, 0`
184
185			`; exception messages`
186
187			`uemsg:`
188			`.byte "unknown exception"`
189			`.byte 0x0D, 0x0A, 0`
190
191			`btmsg:`
192			`.byte "bus timeout exception"`
193			`.byte 0x0D, 0x0A, 0`
194
195			`iimsg:`
196			`.byte "illegal instruction exception"`
197			`.byte 0x0D, 0x0A, 0`
198
199			`pimsg:`
200			`.byte "privileged instruction exception"`
201			`.byte 0x0D, 0x0A, 0`
202
203			`dimsg:`
204			`.byte "divide instruction exception"`
205			`.byte 0x0D, 0x0A, 0`
206
207			`timsg:`
208			`.byte "trap instruction exception"`
209			`.byte 0x0D, 0x0A, 0`
210
211			`msmsg:`
212			`.byte "TLB miss exception"`
213			`.byte 0x0D, 0x0A, 0`
214
215			`wrmsg:`
216			`.byte "TLB write exception"`
217			`.byte 0x0D, 0x0A, 0`
218
219			`ivmsg:`
220			`.byte "TLB invalid exception"`
221			`.byte 0x0D, 0x0A, 0`
222
223			`iamsg:`
224			`.byte "illegal address exception"`
225			`.byte 0x0D, 0x0A, 0`
226
227			`pamsg:`
228			`.byte "privileged address exception"`
229			`.byte 0x0D, 0x0A, 0`