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; ###----------------------------------------------------------------###
; # file : it001.s #
; # date : Mar 26 1996 #
; # descr. : functional test for mips #
; ###----------------------------------------------------------------###
; ###--------------------------------------------------------###
; # hardware interrupt #
; ###--------------------------------------------------------###
hardware_it0 .equ 0x00000400
hardware_it1 .equ 0x00000800
hardware_it2 .equ 0x00001000
hardware_it3 .equ 0x00002000
hardware_it4 .equ 0x00004000
hardware_it5 .equ 0x00008000
timer_0 .equ 0x40000100
timer_1 .equ 0x40000104
timer_2 .equ 0x40000108
timer_3 .equ 0x4000010C
timer_4 .equ 0x40000110
timer_5 .equ 0x40000114
timer_rst .equ 0x40000118
timer_sts .equ 0x4000011C
.org 0x80000080
.start handler_body
; ###--------------------------------------------------------###
; # interrupt and exception handler #
; ###--------------------------------------------------------###
handler_body:
sw r29, 0 (r30)
sw r28, 4 (r30)
loadi r28, hardware_it1
mfc0 r29, cause
nop
and r29, r29, r28 ; hardware interrupt 1 ?
bne r29, r28,other_causes
nop
; ###---------------------------------------------###
; # On releve la ligne it #
; ###---------------------------------------------###
loadi r28, timer_sts
sw r0, 0(r28)
lw r29, 0 (r30)
lw r28, 4 (r30)
; ###--------------------------------------------------------###
; # restore return address before returning (from INTERRUPT) #
; # to the user program (address must be saved by the user #
; # prior to the EXCEPTION in r31) #
; ###--------------------------------------------------------###
return:
rfe ; return from exception
jr r31
other_causes: j other_causes
nop
; ###--------------------------------------------------------###
; # return to the interrupted program #
; ###--------------------------------------------------------###
.end
|
