i80200_irq.S revision 1.14
1/* $NetBSD: i80200_irq.S,v 1.14 2007/03/09 19:21:59 thorpej 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#include "opt_perfctrs.h" 40 41#include <machine/asm.h> 42#include <machine/cpu.h> 43#include <machine/frame.h> 44 45#include <arm/xscale/i80200reg.h> 46 47/* 48 * irq_entry: 49 * 50 * Main entry point for the IRQ vector on i80200 CPUs. Calls 51 * board-specific external interrupt dispatch routine. 52 */ 53 54 .text 55 .align 0 56 57.Lcurrent_intr_depth: 58 .word _C_LABEL(current_intr_depth) 59 60.Lintr_dispatch: 61 .word _C_LABEL(i80200_extirq_dispatch) 62 63#if defined(PERFCTRS) 64.Lpmc_dispatch: 65 .word _C_LABEL(xscale_pmc_dispatch) 66#endif 67 68LOCK_CAS_CHECK_LOCALS 69 70AST_ALIGNMENT_FAULT_LOCALS 71 72ASENTRY_NP(irq_entry) 73 sub lr, lr, #0x00000004 /* Adjust the lr */ 74 75 PUSHFRAMEINSVC /* Push an interrupt frame */ 76 ENABLE_ALIGNMENT_FAULTS 77 78 /* 79 * Note that we have entered the IRQ handler. We are 80 * in SVC mode so we cannot use the processor mode to 81 * determine if we are in an IRQ. Instead, we will 82 * count each time the interrupt handler is nested. 83 */ 84 ldr r0, .Lcurrent_intr_depth 85 ldr r1, [r0] 86 add r1, r1, #1 87 str r1, [r0] 88 89 /* 90 * Get the interrupt status into a callee-save register. 91 */ 92 mrc p13, 0, r4, c4, c0, 0 93 94#if defined(PERFCTRS) 95 /* 96 * Check for PMU interrupts. 97 * If we have one, call the routine to handle it. 98 */ 99 tst r4, #(INTSRC_PI) 100 beq .Lpmc_intr_return 101 mov r1, r4 102 mov r0, sp 103 mov lr, pc 104 ldr pc, .Lpmc_dispatch 105.Lpmc_intr_return: 106#endif 107 108 /* 109 * XXX - any need to handle BMU interrupts? 110 */ 111 112 /* 113 * Check for external IRQs. If we have one, call the 114 * external IRQ dispatcher. The argument is a pointer 115 * to the stack frame. This function will be called with 116 * interrupts disabled, and will return with interrupts 117 * disabled. 118 */ 119 tst r4, #(INTSRC_II) 120 beq .Lextirq_return /* no external IRQ pending */ 121 ldr r1, .Lintr_dispatch 122 mov r0, sp 123 mov lr, pc 124 ldr pc, [r1] 125.Lextirq_return: 126 127 /* Decremement the nest count. */ 128 ldr r0, .Lcurrent_intr_depth 129 ldr r1, [r0] 130 sub r1, r1, #1 131 str r1, [r0] 132 133 LOCK_CAS_CHECK 134 135 DO_AST_AND_RESTORE_ALIGNMENT_FAULTS 136 PULLFRAMEFROMSVCANDEXIT 137 movs pc, lr /* Exit */ 138 139 .bss 140 .align 0 141 142 .global _C_LABEL(astpending) 143_C_LABEL(astpending): 144 .word 0 145 146 .global _C_LABEL(current_intr_depth) 147_C_LABEL(current_intr_depth): 148 .word 0 149