i80200_irq.S revision 1.2
1 /* $NetBSD: i80200_irq.S,v 1.2 2002/06/25 19:40:46 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 40 #include <machine/asm.h> 41 #include <machine/cpu.h> 42 #include <machine/frame.h> 43 44 #include <arm/xscale/i80200reg.h> 45 46 /* 47 * irq_entry: 48 * 49 * Main entry point for the IRQ vector. 50 * 51 * This function reads the 2 IQ80310 CPLD interrupt source 52 * registers, and then calls the installed handlers for each 53 * bit that is set. The function stray_irqhandler is called 54 * if a handler is not defined for a particular interrupt. 55 * 56 * If an interrupt handler is found, then it is called with 57 * r0 containing the argument defined in the handler structure. 58 * If the field ih_arg is zero, then a pointer to the IRQ frame 59 * on the stack is passed instead. 60 */ 61 62 .text 63 .align 0 64 65 Lcurrent_intr_depth: 66 .word _C_LABEL(current_intr_depth) 67 .word _C_LABEL(prev_intr_depth) 68 69 Lintr_dispatch: 70 .word _C_LABEL(i80200_extirq_dispatch) 71 72 Lastpending: 73 .word _C_LABEL(astpending) 74 75 ASENTRY_NP(irq_entry) 76 sub lr, lr, #0x00000004 /* Adjust the lr */ 77 78 PUSHFRAMEINSVC /* Push an interrupt frame */ 79 80 /* 81 * Note that we have entered the IRQ handler. We are 82 * in SVC mode so we cannot use the processor mode to 83 * determine if we are in an IRQ. Instead, we will 84 * count each time the interrupt handler is nested. 85 */ 86 ldr r0, Lcurrent_intr_depth 87 ldr r2, Lcurrent_intr_depth+4 88 ldr r1, [r0] 89 str r1, [r2] 90 add r1, r1, #1 91 str r1, [r0] 92 93 /* 94 * Get the interrupt status into a callee-save register. 95 */ 96 mrc p13, 0, r4, c4, c0, 0 97 98 /* 99 * XXX Right here will be a good place to check for PMU 100 * XXX interrupts, if we decide to use IRQs for them. 101 */ 102 103 /* 104 * Check for external IRQs. If we have one, call the 105 * external IRQ dispatcher. The argument is a pointer 106 * to the stack frame. This function will be called with 107 * interrupts disabled, and will return with interrupts 108 * disabled. 109 */ 110 tst r4, #(INTSRC_II) 111 beq Lextirq_return /* no external IRQ pending */ 112 ldr r1, Lintr_dispatch 113 add lr, pc, #Lextirq_return - . - 8 114 mov r0, sp 115 ldr pc, [r1] 116 Lextirq_return: 117 118 /* Decremement the nest count. */ 119 ldr r0, Lcurrent_intr_depth 120 ldr r2, Lcurrent_intr_depth+4 121 ldr r1, [r0] 122 str r1, [r2] 123 sub r1, r1, #1 124 str r1, [r0] 125 126 /* 127 * If we're returning to user mode, check for pending ASTs. 128 */ 129 ldr r0, [sp] /* Get the SPSR from stack */ 130 and r0, r0, #(PSR_MODE) /* Test for USR32 mode before the IRQ */ 131 teq r0, #(PSR_USR32_MODE) 132 bne Lirqout /* Nope, get out now */ 133 134 Lastloop: 135 ldr r0, Lastpending /* Do we have an AST pending? */ 136 ldr r1, [r0] 137 teq r1, #0x00000000 138 beq Lirqout /* Nope, get out now */ 139 140 mov r1, #0x00000000 141 str r1, [r0] /* Clear astpending */ 142 143 mrs r4, cpsr_all /* save CPSR */ 144 bic r0, r4, #(I32_bit) /* Enable IRQs */ 145 msr cpsr_all, r0 146 147 mov r0, sp 148 bl _C_LABEL(ast) /* ast(frame) */ 149 150 msr cpsr_all, r4 /* Disable IRQs */ 151 b Lastloop /* Check for more ASTs */ 152 153 Lirqout: 154 PULLFRAMEFROMSVCANDEXIT 155 movs pc, lr /* Exit */ 156 157 .bss 158 .align 0 159 160 .global _C_LABEL(astpending) 161 _C_LABEL(astpending): 162 .word 0 163 164 .global _C_LABEL(current_intr_depth) 165 _C_LABEL(current_intr_depth): 166 .word 0 167 168 .global _C_LABEL(prev_intr_depth) 169 _C_LABEL(prev_intr_depth): 170 .word 0 171 172 /* 173 * XXX Provide intrnames/intrcnt for legacy code, but 174 * don't actually use them. 175 */ 176 177 .global _C_LABEL(intrnames), _C_LABEL(eintrnames) 178 .global _C_LABEL(intrcnt), _C_LABEL(eintrcnt) 179 _C_LABEL(intrnames): 180 _C_LABEL(eintrnames): 181 182 .global _C_LABEL(intrcnt), _C_LABEL(sintrcnt), _C_LABEL(eintrcnt) 183 _C_LABEL(intrcnt): 184 _C_LABEL(eintrcnt): 185
Indexes created Mon Sep 29 21:09:56 GMT 2025