patch-2.4.20 linux-2.4.20/arch/mips/sgi-ip27/ip27-irq-glue.S

• Lines: 65
• Date: Thu Nov 28 15:53:10 2002
• Orig file: linux-2.4.19/arch/mips/sgi-ip27/ip27-irq-glue.S
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.19/arch/mips/sgi-ip27/ip27-irq-glue.S linux-2.4.20/arch/mips/sgi-ip27/ip27-irq-glue.S
@@ -0,0 +1,64 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1999 Ralf Baechle
+ * Copyright (C) 1999 Silicon Graphics, Inc.
+ */
+#include <asm/asm.h>
+#include <asm/mipsregs.h>
+#include <asm/regdef.h>
+#include <asm/stackframe.h>
+
+	.text
+	.set	noat
+	.align	5
+NESTED(ip27_irq, PT_SIZE, sp)
+	SAVE_ALL
+	CLI
+	.set	at
+
+	/* IP27 may signal interrupt which we're not interested in.
+	   Mask them out.  */
+	mfc0	s0, CP0_CAUSE
+	mfc0	t0, CP0_STATUS
+	and	s0, t0
+
+	/* First check for RT interrupt.  */
+	andi	a0, s0, CAUSEF_IP4
+	beqz	a0, 1f
+
+	/* Ok, a timer interrupt. */
+	move	a0, sp
+	jal	rt_timer_interrupt
+
+	j	ret_from_irq
+
+1:	andi	a0, s0, (CAUSEF_IP2 | CAUSEF_IP3)
+	beqz	a0, 1f
+
+	/* ... a device interrupt ...  */
+	move	a0, sp
+	jal	ip27_do_irq
+
+	j	ret_from_irq
+
+1:
+#if 1
+	mfc0	a1, CP0_STATUS
+	srl	a1, a1, 8
+	andi	a1, 0xff
+
+	mfc0	a2, CP0_CAUSE
+	srl	a2, a2, 8
+	andi	a2, 0xff
+
+	move	a3, s0
+	PRINT("Spurious interrupt, c0_status = %02x, c0_cause = %02x, pending %02x.\n")
+	ld	a1, PT_EPC(sp)
+0:	b	0b
+#endif
+
+	j	ret_from_irq
+	END(ip27_irq)