IEPP

Synopsis:

Increment execution pattern pointer.

Operation:

eptr = eptr + 1

Description:

This instruction increments the execution pattern pointer register. The execution pattern pointer register is an index into the execution pattern table. Incrementing the pointer may cause the active execution context to change. This instruction also flushes the processor pipeline of instructions.

This instruction will never cause an exception.

Format:

Opcode₇	Reserved₁₈	Func₇
0	_----	15

Assembler Example:

;------------------------------------------------------------------------------

; 1000 Hz interrupt

; This IRQ must be fast.

; Increments the millisecond counter, and switches to the next context

;------------------------------------------------------------------------------

;

irq1000Hz:

sw r26,r26_save

sw r1,r1_save

outb r0,0xDCFFFD ; acknowledge interrupt

lw r1,Milliseconds ; increment milliseconds count

addui r1,r1,#1

sw r1,Milliseconds

lw r26,r26_save

lw r1,r1_save

iepp ; move to the next context

iret ; return to the next context

sw	r26,r26_save
sw	r1,r1_save
outb	r0,0xDCFFFD	; acknowledge interrupt
lw	r1,Milliseconds	; increment milliseconds count
addui	r1,r1,#1
sw	r1,Milliseconds
lw	r26,r26_save
lw	r1,r1_save
iepp		; move to the next context
iret		; return to the next context