patch-2.4.22 linux-2.4.22/arch/mips/tx4927/common/tx4927_irq_handler.S

• Lines: 105
• Date: 2003-08-25 04:44:40.000000000 -0700
• Orig file: linux-2.4.21/arch/mips/tx4927/common/tx4927_irq_handler.S
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/arch/mips/tx4927/common/tx4927_irq_handler.S linux-2.4.22/arch/mips/tx4927/common/tx4927_irq_handler.S
@@ -0,0 +1,104 @@
+/*
+ * linux/arch/mips/tx4927/common/tx4927_irq_handler.S
+ *
+ * Primary interrupt handler for tx4927 based systems
+ *
+ * Author: MontaVista Software, Inc.
+ * Author: jsun@mvista.com or jsun@junsun.net
+ *         source@mvista.com
+ *
+ * Copyright 2001-2002 MontaVista Software Inc.
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ *  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+ *  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <linux/config.h>
+#include <asm/asm.h>
+#include <asm/mipsregs.h>
+#include <asm/addrspace.h>
+#include <asm/regdef.h>
+#include <asm/stackframe.h>
+#include <asm/tx4927/tx4927.h>
+
+		.align	5
+		NESTED(tx4927_irq_handler, PT_SIZE, sp)
+		SAVE_ALL
+		CLI
+		.set	at
+
+		mfc0	t0, CP0_CAUSE  
+		mfc0	t1, CP0_STATUS
+		and	t0, t1
+        
+		andi	t1, t0, STATUSF_IP7	/* cpu timer */
+		bnez	t1, ll_ip7
+		
+		/* IP6..IP3 multiplexed -- do not use */
+
+		andi	t1, t0, STATUSF_IP2	/* tx4927 pic */
+		bnez	t1, ll_ip2
+
+		andi	t1, t0, STATUSF_IP0	/* user line 0 */
+		bnez	t1, ll_ip0
+
+		andi	t1, t0, STATUSF_IP1	/* user line 1 */
+		bnez	t1, ll_ip1
+
+		.set	reorder
+
+		/* wrong alarm or masked ... */
+		j	spurious_interrupt
+		nop
+		END(tx4927_irq_handler)
+
+		.align	5
+
+
+ll_ip7:
+		li	a0, TX4927_IRQ_CPU_TIMER
+		move	a1, sp
+		jal	do_IRQ
+		j	ret_from_irq
+
+ll_ip2:
+		jal	tx4927_irq_nested
+		nop
+		beqz 	v0, goto_spurious_interrupt
+		nop
+		move	a0, v0
+		move	a1, sp
+		jal	do_IRQ
+		j	ret_from_irq
+
+goto_spurious_interrupt:
+	j spurious_interrupt
+	nop
+
+ll_ip1:
+		li	a0, TX4927_IRQ_USER1
+		move	a1, sp
+		jal	do_IRQ
+		j	ret_from_irq
+
+ll_ip0:
+		li	a0, TX4927_IRQ_USER0
+		move	a1, sp
+		jal	do_IRQ
+		j	ret_from_irq