patch-2.4.0-test4 linux/arch/mips/orion/int-handler.S

• Lines: 54
• Date: Tue Jul 11 11:14:48 2000
• Orig file: v2.4.0-test3/linux/arch/mips/orion/int-handler.S
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test3/linux/arch/mips/orion/int-handler.S linux/arch/mips/orion/int-handler.S
@@ -0,0 +1,53 @@
+#include <asm/asm.h>
+#include <asm/mipsregs.h>
+#include <asm/regdef.h>
+#include <asm/stackframe.h>
+
+	.text
+	.set    mips1
+	.set    reorder
+	.set    macro
+	.set    noat
+	.align	5
+
+NESTED(orionIRQ, PT_SIZE, sp)
+	SAVE_ALL
+	CLI				# Important: mark KERNEL mode !
+	/*
+	 * 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
+	sll	t0,16			# shift the pending bits down
+	beqz	t0,3f			# no pending intrs, then spurious
+	nop				# delay slot
+	
+	/*
+	 * Find irq with highest priority
+	 * FIXME: This is slow - use binary search
+	 */
+	la	a0,7
+1:	bltz	t0,2f			# found pending irq
+	subu	a0,1
+	sll	t0,1
+	b	1b
+	nop				# delay slot
+
+call_do_IRQ:
+2:	move	a1,sp
+	jal	do_IRQ
+	nop				# delay slot
+
+	mfc0	t0,CP0_STATUS		# disable interrupts
+	ori	t0,1
+	xori	t0,1
+	mtc0	t0,CP0_STATUS
+	
+	la      a1, ret_from_irq
+	jr	a1
+	
+3:	j	spurious_interrupt
+END(orionIRQ)
+