patch-2.4.19 linux-2.4.19/arch/mips/jmr3927/rbhma3100/int-handler.S

• Lines: 75
• Date: Fri Aug 2 17:39:43 2002
• Orig file: linux-2.4.18/arch/mips/jmr3927/rbhma3100/int-handler.S
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/arch/mips/jmr3927/rbhma3100/int-handler.S linux-2.4.19/arch/mips/jmr3927/rbhma3100/int-handler.S
@@ -0,0 +1,74 @@
+/*
+ * Copyright 2001 MontaVista Software Inc.
+ * Author: MontaVista Software, Inc.
+ *              ahennessy@mvista.com       
+ *
+ * Based on arch/mips/tsdb/kernel/int-handler.S
+ *
+ * Copyright (C) 2000-2001 Toshiba Corporation
+ *
+ *  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 <asm/asm.h>
+#include <asm/mipsregs.h>
+#include <asm/regdef.h>
+#include <asm/stackframe.h>
+#include <asm/jmr3927/jmr3927.h>
+
+	/* A lot of complication here is taken away because:
+	 *
+	 * 1) We handle one interrupt and return, sitting in a loop
+	 *    and moving across all the pending IRQ bits in the cause
+	 *    register is _NOT_ the answer, the common case is one
+	 *    pending IRQ so optimize in that direction.
+	 *
+	 * 2) We need not check against bits in the status register
+	 *    IRQ mask, that would make this routine slow as hell.
+	 *
+	 * 3) Linux only thinks in terms of all IRQs on or all IRQs
+	 *    off, nothing in between like BSD spl() brain-damage.
+	 *
+	 */
+
+/* Flush write buffer (needed?)
+ * NOTE: TX39xx performs "non-blocking load", so explicitly use the target
+ * register of LBU to flush immediately.
+ */
+#define FLUSH_WB(tmp)	\
+	la	tmp, JMR3927_IOC_REV_ADDR; \
+	lbu	tmp, (tmp); \
+	move	tmp, zero;
+
+	.text
+	.set	noreorder
+	.set	noat
+	.align	5
+	NESTED(jmr3927_IRQ, PT_SIZE, sp)
+	SAVE_ALL
+	CLI
+	.set	at
+	jal	jmr3927_irc_irqdispatch
+	 move	a0, sp
+	FLUSH_WB(t0)
+	j	ret_from_irq
+	 nop
+	END(jmr3927_IRQ)