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#include <asm/asm.h>
#include <asm/mipsregs.h>
#include <asm/regdef.h>
#include <asm/stackframe.h>
.text
.set macro
.set noat
.align 5
NESTED(it8172_IRQ, PT_SIZE, sp)
SAVE_ALL
CLI # Important: mark KERNEL mode !
/* We're working with 'reorder' set at this point. */
/*
* Get pending interrupts
*/
mfc0 t0,CP0_CAUSE # get pending interrupts
mfc0 t1,CP0_STATUS # get enabled interrupts
and t0,t1 # isolate allowed ones
andi t0,0xff00 # isolate pending bits
beqz t0, 3f # spurious interrupt
andi a0, t0, CAUSEF_IP7
beq a0, zero, 1f
li a0, 127 # MIPS_CPU_TIMER_IRQ = (NR_IRQS-1)
move a1, sp
jal ll_timer_interrupt
j ret_from_irq
nop
1:
andi a0, t0, CAUSEF_IP2 # the only int we expect at this time
beq a0, zero, 3f
move a0,sp
jal it8172_hw0_irqdispatch
mfc0 t0,CP0_STATUS # disable interrupts
ori t0,1
xori t0,1
mtc0 t0,CP0_STATUS
nop
nop
nop
la a1, ret_from_irq
jr a1
nop
3:
move a0, sp
jal mips_spurious_interrupt
nop
la a1, ret_from_irq
jr a1
nop
END(it8172_IRQ)
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