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      1 /*	$NetBSD: i80200_irq.S,v 1.19 2020/11/21 19:55:49 skrll Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2002 Wasabi Systems, Inc.
      5  * All rights reserved.
      6  *
      7  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed for the NetBSD Project by
     20  *	Wasabi Systems, Inc.
     21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
     22  *    or promote products derived from this software without specific prior
     23  *    written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
     29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     35  * POSSIBILITY OF SUCH DAMAGE.
     36  */
     37 
     38 #include "assym.h"
     39 
     40 #include <arm/asm.h>
     41 #include <arm/locore.h>
     42 
     43 #include <arm/xscale/i80200reg.h>
     44 
     45 /*
     46  * irq_entry:
     47  *
     48  *	Main entry point for the IRQ vector on i80200 CPUs.  Calls
     49  *	board-specific external interrupt dispatch routine.
     50  */
     51 
     52 	.text
     53 	.align	0
     54 
     55 .Lintr_dispatch:
     56 	.word	_C_LABEL(i80200_extirq_dispatch)
     57 
     58 LOCK_CAS_CHECK_LOCALS
     59 
     60 AST_ALIGNMENT_FAULT_LOCALS
     61 
     62 ASENTRY_NP(irq_entry)
     63 	sub	lr, lr, #0x00000004	/* Adjust the lr */
     64 
     65 	PUSHFRAMEINSVC			/* Push an interrupt frame */
     66 	ENABLE_ALIGNMENT_FAULTS		/* puts cur{cpu,lwp} in r4/r5 */
     67 
     68 	/*
     69 	 * Note that we have entered the IRQ handler.  We are
     70 	 * in SVC mode so we cannot use the processor mode to
     71 	 * determine if we are in an IRQ.  Instead, we will
     72 	 * count each time the interrupt handler is nested.
     73 	 */
     74 	ldr	r1, [r4, #CI_INTR_DEPTH]
     75 	add	r1, r1, #1
     76 	str	r1, [r4, #CI_INTR_DEPTH]
     77 
     78 	/*
     79 	 * Get the interrupt status into a callee-save register.
     80 	 */
     81 	mrc	p13, 0, r6, c4, c0, 0
     82 
     83 	/*
     84 	 * XXX - any need to handle BMU interrupts?
     85 	 */
     86 
     87 	/*
     88 	 * Check for external IRQs.  If we have one, call the
     89 	 * external IRQ dispatcher.  The argument is a pointer
     90 	 * to the stack frame.  This function will be called with
     91 	 * interrupts disabled, and will return with interrupts
     92 	 * disabled.
     93 	 */
     94 	tst	r6, #(INTSRC_II)
     95 	beq	.Lextirq_return		/* no external IRQ pending */
     96 	ldr	r1, .Lintr_dispatch
     97 	mov	r0, sp
     98 	mov	lr, pc
     99 	ldr	pc, [r1]
    100 .Lextirq_return:
    101 
    102 	/* Decremement the nest count. */
    103 	ldr	r1, [r4, #CI_INTR_DEPTH]
    104 	sub	r1, r1, #1
    105 	str	r1, [r4, #CI_INTR_DEPTH]
    106 
    107 	LOCK_CAS_CHECK
    108 
    109 	DO_AST_AND_RESTORE_ALIGNMENT_FAULTS
    110 	PULLFRAMEFROMSVCANDEXIT
    111 	movs	pc, lr			/* Exit */
    112