nbsp; ; parameter to oeminterrupthandler
msr cpsr_c, #svc_mode:or:0x80 ; switch to supervisor mode w/irqs disabled
stmfd sp!, ; save lr onto the svc stack
stmfd sp!, ; save irq lr (in r0) onto the svc stack (param)
;
; now we call the oem"s interrupt handler code. it is up to them to
; enable interrupts if they so desire. we can"t do it for them since
; there"s only on interrupt and they haven"t yet defined their nesting.
; call oeminterrupthandler
ldmfd sp!, ; dummy pop (parameter)
ldmfd sp!, ; restore svc lr from the svc stack
msr cpsr_c, #irq_mode:or:0x80 ; switch back to irq mode w/irqs disabled
; restore the saved program status register from the stack.
;
ldmfd sp!, ; restore irq spsr from the irq stack
msr spsr, r1 ; (r1) = saved status reg
ldr lr, =kdata ; (lr) = ptr to kdatastruct
cmp r0, #sysintr_resched ;->時(shí)間片已到，進(jìn)行調(diào)度
beq %f10
;sysintr_devices equ 8 ;是否設(shè)備中斷，中斷號是否有效
;sysintr_max_devices equ 32
sub r0, r0, #sysintr_devices
cmp r0, #sysintr_max_devices
;由此可以看出windowsce的系統(tǒng)中斷號******支持32種從9-40.
;其中第16號(24)被定義為sysintr_firmware
; if not a device request (and not sysintr_resched)
ldrhsb r0, [lr, #bresched] ; (r0) = reschedule flag
bhs %f20 ; not a device request
;pendevents equ 0x340 ; offset 0x10＊sizeof(dword) of ainfo
;device 中斷
ldr r2, [lr, #pendevents] |
