1/* 2 * Copyright (c) 2008 The DragonFly Project. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 3. Neither the name of The DragonFly Project nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific, prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 22 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 28 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * from: vector.s, 386BSD 0.1 unknown origin 32 * $FreeBSD: src/sys/i386/isa/icu_vector.s,v 1.14.2.2 2000/07/18 21:12:42 dfr Exp $ 33 * $DragonFly: src/sys/platform/pc64/icu/icu_vector.s,v 1.1 2008/08/29 17:07:16 dillon Exp $ 34 */ 35/* 36 * WARNING! SMP builds can use the ICU now so this code must be MP safe. 37 */ 38 39#include "opt_auto_eoi.h" 40 41#include <machine/asmacros.h> 42#include <machine/lock.h> 43#include <machine/psl.h> 44#include <machine/trap.h> 45#include <machine/segments.h> 46 47#include <machine_base/icu/icu.h> 48#include <bus/isa/i386/isa.h> 49 50#include "assym.s" 51#include "icu_ipl.h" 52 53#ifndef APIC_IO 54 55#define ICU_IMR_OFFSET 1 /* IO_ICU{1,2} + 1 */ 56 57#define ICU_EOI 0x20 /* XXX - define elsewhere */ 58 59#define IRQ_LBIT(irq_num) (1 << (irq_num)) 60#define IRQ_BIT(irq_num) (1 << ((irq_num) % 8)) 61#define IRQ_BYTE(irq_num) ((irq_num) >> 3) 62 63#ifdef AUTO_EOI_1 64#define ENABLE_ICU1 /* use auto-EOI to reduce i/o */ 65#define OUTB_ICU1 66#else 67#define ENABLE_ICU1 \ 68 movb $ICU_EOI,%al ; /* as soon as possible send EOI ... */ \ 69 OUTB_ICU1 ; /* ... to clear in service bit */ \ 70 71#define OUTB_ICU1 \ 72 outb %al,$IO_ICU1 ; \ 73 74#endif 75 76#ifdef AUTO_EOI_2 77/* 78 * The data sheet says no auto-EOI on slave, but it sometimes works. 79 */ 80#define ENABLE_ICU1_AND_2 ENABLE_ICU1 81#else 82#define ENABLE_ICU1_AND_2 \ 83 movb $ICU_EOI,%al ; /* as above */ \ 84 outb %al,$IO_ICU2 ; /* but do second icu first ... */ \ 85 OUTB_ICU1 ; /* ... then first icu (if !AUTO_EOI_1) */ \ 86 87#endif 88 89/* 90 * Macro helpers 91 */ 92#define ICU_PUSH_FRAME \ 93 PUSH_FRAME ; /* 15 regs + space for 5 extras */ \ 94 movl $0,TF_XFLAGS(%rsp) ; \ 95 movl $0,TF_TRAPNO(%rsp) ; \ 96 movl $0,TF_ADDR(%rsp) ; \ 97 movl $0,TF_FLAGS(%rsp) ; \ 98 movl $0,TF_ERR(%rsp) ; \ 99 cld ; \ 100 101#define MASK_IRQ(icu, irq_num) \ 102 ICU_IMASK_LOCK ; \ 103 movb icu_imen + IRQ_BYTE(irq_num),%al ; \ 104 orb $IRQ_BIT(irq_num),%al ; \ 105 movb %al,icu_imen + IRQ_BYTE(irq_num) ; \ 106 outb %al,$icu+ICU_IMR_OFFSET ; \ 107 ICU_IMASK_UNLOCK ; \ 108 109#define UNMASK_IRQ(icu, irq_num) \ 110 cmpl $0,%eax ; \ 111 jnz 8f ; \ 112 ICU_IMASK_LOCK ; \ 113 movb icu_imen + IRQ_BYTE(irq_num),%al ; \ 114 andb $~IRQ_BIT(irq_num),%al ; \ 115 movb %al,icu_imen + IRQ_BYTE(irq_num) ; \ 116 outb %al,$icu+ICU_IMR_OFFSET ; \ 117 ICU_IMASK_UNLOCK ; \ 1188: ; \ 119 120/* 121 * Fast interrupt call handlers run in the following sequence: 122 * 123 * - Push the trap frame required by doreti. 124 * - Mask the interrupt and reenable its source. 125 * - If we cannot take the interrupt set its fpending bit and 126 * doreti. 127 * - If we can take the interrupt clear its fpending bit, 128 * call the handler, then unmask the interrupt and doreti. 129 * 130 * YYY can cache gd base pointer instead of using hidden %fs 131 * prefixes. 132 */ 133 134#define FAST_INTR(irq_num, vec_name, icu, enable_icus) \ 135 .text ; \ 136 SUPERALIGN_TEXT ; \ 137IDTVEC(vec_name) ; \ 138 ICU_PUSH_FRAME ; \ 139 FAKE_MCOUNT(15*4(%esp)) ; \ 140 MASK_IRQ(icu, irq_num) ; \ 141 enable_icus ; \ 142 movq PCPU(curthread),%rbx ; \ 143 testl $-1,TD_NEST_COUNT(%rbx) ; \ 144 jne 1f ; \ 145 testl $-1,TD_CRITCOUNT(%rbx) ; \ 146 je 2f ; \ 1471: ; \ 148 /* set pending bit and return, leave interrupt masked */ \ 149 orl $IRQ_LBIT(irq_num),PCPU(fpending) ; \ 150 orl $RQF_INTPEND, PCPU(reqflags) ; \ 151 jmp 5f ; \ 1522: ; \ 153 /* clear pending bit, run handler */ \ 154 andl $~IRQ_LBIT(irq_num),PCPU(fpending) ; \ 155 pushq $irq_num ; \ 156 movq %rsp,%rdi ; /* rdi = call argument */ \ 157 incl TD_CRITCOUNT(%rbx) ; \ 158 call ithread_fast_handler ; /* returns 0 to unmask int */ \ 159 decl TD_CRITCOUNT(%rbx) ; \ 160 addq $8,%rsp ; /* intr frame -> trap frame */ \ 161 UNMASK_IRQ(icu, irq_num) ; \ 1625: ; \ 163 MEXITCOUNT ; \ 164 jmp doreti ; \ 165 166/* 167 * Unmask a slow interrupt. This function is used by interrupt threads 168 * after they have descheduled themselves to reenable interrupts and 169 * possibly cause a reschedule to occur. 170 */ 171 172#define INTR_UNMASK(irq_num, vec_name, icu) \ 173 .text ; \ 174 SUPERALIGN_TEXT ; \ 175IDTVEC(vec_name) ; \ 176 pushq %rbp ; /* frame for ddb backtrace */ \ 177 movq %rsp, %rbp ; \ 178 subq %rax, %rax ; \ 179 UNMASK_IRQ(icu, irq_num) ; \ 180 popq %rbp ; \ 181 ret ; \ 182 183MCOUNT_LABEL(bintr) 184 FAST_INTR(0,icu_fastintr0, IO_ICU1, ENABLE_ICU1) 185 FAST_INTR(1,icu_fastintr1, IO_ICU1, ENABLE_ICU1) 186 FAST_INTR(2,icu_fastintr2, IO_ICU1, ENABLE_ICU1) 187 FAST_INTR(3,icu_fastintr3, IO_ICU1, ENABLE_ICU1) 188 FAST_INTR(4,icu_fastintr4, IO_ICU1, ENABLE_ICU1) 189 FAST_INTR(5,icu_fastintr5, IO_ICU1, ENABLE_ICU1) 190 FAST_INTR(6,icu_fastintr6, IO_ICU1, ENABLE_ICU1) 191 FAST_INTR(7,icu_fastintr7, IO_ICU1, ENABLE_ICU1) 192 FAST_INTR(8,icu_fastintr8, IO_ICU2, ENABLE_ICU1_AND_2) 193 FAST_INTR(9,icu_fastintr9, IO_ICU2, ENABLE_ICU1_AND_2) 194 FAST_INTR(10,icu_fastintr10, IO_ICU2, ENABLE_ICU1_AND_2) 195 FAST_INTR(11,icu_fastintr11, IO_ICU2, ENABLE_ICU1_AND_2) 196 FAST_INTR(12,icu_fastintr12, IO_ICU2, ENABLE_ICU1_AND_2) 197 FAST_INTR(13,icu_fastintr13, IO_ICU2, ENABLE_ICU1_AND_2) 198 FAST_INTR(14,icu_fastintr14, IO_ICU2, ENABLE_ICU1_AND_2) 199 FAST_INTR(15,icu_fastintr15, IO_ICU2, ENABLE_ICU1_AND_2) 200MCOUNT_LABEL(eintr) 201 202 .data 203 204 .text 205 206#endif 207