1/* $NetBSD: i80200_irq.S,v 1.9 2002/10/25 14:29:37 briggs 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 .word _C_LABEL(prev_intr_depth) 60 61.Lintr_dispatch: 62 .word _C_LABEL(i80200_extirq_dispatch) 63 64#if defined(PERFCTRS) 65.Lpmc_dispatch: 66 .word _C_LABEL(xscale_pmc_dispatch) 67#endif 68 69.Lastpending: 70 .word _C_LABEL(astpending) 71 72ASENTRY_NP(irq_entry) 73 sub lr, lr, #0x00000004 /* Adjust the lr */ 74 75 PUSHFRAMEINSVC /* Push an interrupt frame */ 76 77 /* 78 * Note that we have entered the IRQ handler. We are 79 * in SVC mode so we cannot use the processor mode to 80 * determine if we are in an IRQ. Instead, we will 81 * count each time the interrupt handler is nested. 82 */ 83 ldr r0, .Lcurrent_intr_depth 84 ldr r2, .Lcurrent_intr_depth+4 85 ldr r1, [r0] 86 str r1, [r2] 87 add r1, r1, #1 88 str r1, [r0] 89 90 /* 91 * Get the interrupt status into a callee-save register. 92 */ 93 mrc p13, 0, r4, c4, c0, 0 94 95#if defined(PERFCTRS) 96 /* 97 * Check for PMU interrupts. 98 * If we have one, call the routine to handle it. 99 */ 100 tst r4, #(INTSRC_PI) 101 beq .Lpmc_intr_return 102 mov r1, r4 103 mov r0, sp 104 mov lr, pc 105 ldr pc, .Lpmc_dispatch 106.Lpmc_intr_return: 107#endif 108 109 /* 110 * XXX - any need to handle BMU interrupts? 111 */ 112 113 /* 114 * Check for external IRQs. If we have one, call the 115 * external IRQ dispatcher. The argument is a pointer 116 * to the stack frame. This function will be called with 117 * interrupts disabled, and will return with interrupts 118 * disabled. 119 */ 120 tst r4, #(INTSRC_II) 121 beq .Lextirq_return /* no external IRQ pending */ 122 ldr r1, .Lintr_dispatch 123 mov r0, sp 124 mov lr, pc 125 ldr pc, [r1] 126.Lextirq_return: 127 128 /* Decremement the nest count. */ 129 ldr r0, .Lcurrent_intr_depth 130 ldr r2, .Lcurrent_intr_depth+4 131 ldr r1, [r0] 132 str r1, [r2] 133 sub r1, r1, #1 134 str r1, [r0] 135 136 /* 137 * If we're returning to user mode, check for pending ASTs. 138 */ 139 ldr r0, [sp] /* Get the SPSR from stack */ 140 and r0, r0, #(PSR_MODE) /* Test for USR32 mode before the IRQ */ 141 teq r0, #(PSR_USR32_MODE) 142 bne .Lirqout /* Nope, get out now */ 143 144.Lastloop: 145 ldr r0, .Lastpending /* Do we have an AST pending? */ 146 ldr r1, [r0] 147 teq r1, #0x00000000 148 beq .Lirqout /* Nope, get out now */ 149 150 mov r1, #0x00000000 151 str r1, [r0] /* Clear astpending */ 152 153 mrs r4, cpsr /* save CPSR */ 154 bic r0, r4, #(I32_bit) /* Enable IRQs */ 155 msr cpsr_c, r0 156 157 mov r0, sp 158 bl _C_LABEL(ast) /* ast(frame) */ 159 160 msr cpsr_c, r4 /* Disable IRQs */ 161 b .Lastloop /* Check for more ASTs */ 162 163.Lirqout: 164 PULLFRAMEFROMSVCANDEXIT 165 movs pc, lr /* Exit */ 166 167 .bss 168 .align 0 169 170 .global _C_LABEL(astpending) 171_C_LABEL(astpending): 172 .word 0 173 174 .global _C_LABEL(current_intr_depth) 175_C_LABEL(current_intr_depth): 176 .word 0 177 178 .global _C_LABEL(prev_intr_depth) 179_C_LABEL(prev_intr_depth): 180 .word 0 181 182 /* 183 * XXX Provide intrnames/intrcnt for legacy code, but 184 * don't actually use them. 185 */ 186 187 .global _C_LABEL(intrnames), _C_LABEL(eintrnames) 188 .global _C_LABEL(intrcnt), _C_LABEL(eintrcnt) 189_C_LABEL(intrnames): 190_C_LABEL(eintrnames): 191 192 .global _C_LABEL(intrcnt), _C_LABEL(sintrcnt), _C_LABEL(eintrcnt) 193_C_LABEL(intrcnt): 194_C_LABEL(eintrcnt): 195