Annotation of sys/arch/amd64/amd64/i8259.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: i8259.c,v 1.5 2007/05/03 18:51:08 grange Exp $ */
! 2: /* $NetBSD: i8259.c,v 1.2 2003/03/02 18:27:15 fvdl Exp $ */
! 3:
! 4: /*
! 5: * Copyright 2002 (c) Wasabi Systems, Inc.
! 6: * All rights reserved.
! 7: *
! 8: * Written by Frank van der Linden for Wasabi Systems, Inc.
! 9: *
! 10: * Redistribution and use in source and binary forms, with or without
! 11: * modification, are permitted provided that the following conditions
! 12: * are met:
! 13: * 1. Redistributions of source code must retain the above copyright
! 14: * notice, this list of conditions and the following disclaimer.
! 15: * 2. Redistributions in binary form must reproduce the above copyright
! 16: * notice, this list of conditions and the following disclaimer in the
! 17: * documentation and/or other materials provided with the distribution.
! 18: * 3. All advertising materials mentioning features or use of this software
! 19: * must display the following acknowledgement:
! 20: * This product includes software developed for the NetBSD Project by
! 21: * Wasabi Systems, Inc.
! 22: * 4. The name of Wasabi Systems, Inc. may not be used to endorse
! 23: * or promote products derived from this software without specific prior
! 24: * written permission.
! 25: *
! 26: * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
! 27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! 28: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! 29: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
! 30: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! 31: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
! 32: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! 33: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
! 34: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! 35: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! 36: * POSSIBILITY OF SUCH DAMAGE.
! 37: */
! 38:
! 39: /*-
! 40: * Copyright (c) 1991 The Regents of the University of California.
! 41: * All rights reserved.
! 42: *
! 43: * This code is derived from software contributed to Berkeley by
! 44: * William Jolitz.
! 45: *
! 46: * Redistribution and use in source and binary forms, with or without
! 47: * modification, are permitted provided that the following conditions
! 48: * are met:
! 49: * 1. Redistributions of source code must retain the above copyright
! 50: * notice, this list of conditions and the following disclaimer.
! 51: * 2. Redistributions in binary form must reproduce the above copyright
! 52: * notice, this list of conditions and the following disclaimer in the
! 53: * documentation and/or other materials provided with the distribution.
! 54: * 3. Neither the name of the University nor the names of its contributors
! 55: * may be used to endorse or promote products derived from this software
! 56: * without specific prior written permission.
! 57: *
! 58: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 59: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 60: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 61: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 62: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 63: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 64: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 65: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 66: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 67: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 68: * SUCH DAMAGE.
! 69: *
! 70: * @(#)isa.c 7.2 (Berkeley) 5/13/91
! 71: */
! 72:
! 73: #include <sys/param.h>
! 74: #include <sys/systm.h>
! 75: #include <sys/kernel.h>
! 76: #include <sys/syslog.h>
! 77: #include <sys/device.h>
! 78: #include <sys/malloc.h>
! 79: #include <sys/proc.h>
! 80:
! 81: #include <dev/isa/isareg.h>
! 82:
! 83: #include <machine/pio.h>
! 84: #include <machine/cpufunc.h>
! 85: #include <machine/cpu.h>
! 86: #include <machine/pic.h>
! 87: #include <machine/i8259.h>
! 88:
! 89: static void i8259_hwmask(struct pic *, int);
! 90: static void i8259_hwunmask(struct pic *, int);
! 91: static void i8259_setup(struct pic *, struct cpu_info *, int, int, int);
! 92: static void i8259_reinit_irqs(void);
! 93:
! 94: unsigned i8259_imen;
! 95:
! 96: /*
! 97: * Perhaps this should be made into a real device.
! 98: */
! 99: struct pic i8259_pic = {
! 100: {0, {NULL}, NULL, 0, "pic0", NULL, 0, 0},
! 101: PIC_I8259,
! 102: #ifdef MULTIPROCESSOR
! 103: {},
! 104: #endif
! 105: i8259_hwmask,
! 106: i8259_hwunmask,
! 107: i8259_setup,
! 108: i8259_setup,
! 109: i8259_stubs,
! 110: i8259_stubs,
! 111: };
! 112:
! 113: void
! 114: i8259_default_setup(void)
! 115: {
! 116: outb(IO_ICU1, 0x11); /* reset; program device, four bytes */
! 117:
! 118: outb(IO_ICU1+1, ICU_OFFSET); /* starting at this vector index */
! 119: outb(IO_ICU1+1, 1 << IRQ_SLAVE); /* slave on line 2 */
! 120: #ifdef AUTO_EOI_1
! 121: outb(IO_ICU1+1, 2 | 1); /* auto EOI, 8086 mode */
! 122: #else
! 123: outb(IO_ICU1+1, 1); /* 8086 mode */
! 124: #endif
! 125: outb(IO_ICU1+1, 0xff); /* leave interrupts masked */
! 126: outb(IO_ICU1, 0x68); /* special mask mode (if available) */
! 127: outb(IO_ICU1, 0x0a); /* Read IRR by default. */
! 128: #ifdef REORDER_IRQ
! 129: outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */
! 130: #endif
! 131:
! 132: outb(IO_ICU2, 0x11); /* reset; program device, four bytes */
! 133:
! 134: outb(IO_ICU2+1, ICU_OFFSET+8); /* staring at this vector index */
! 135: outb(IO_ICU2+1, IRQ_SLAVE);
! 136: #ifdef AUTO_EOI_2
! 137: outb(IO_ICU2+1, 2 | 1); /* auto EOI, 8086 mode */
! 138: #else
! 139: outb(IO_ICU2+1, 1); /* 8086 mode */
! 140: #endif
! 141: outb(IO_ICU2+1, 0xff); /* leave interrupts masked */
! 142: outb(IO_ICU2, 0x68); /* special mask mode (if available) */
! 143: outb(IO_ICU2, 0x0a); /* Read IRR by default. */
! 144: }
! 145:
! 146: static void
! 147: i8259_hwmask(struct pic *pic, int pin)
! 148: {
! 149: unsigned port;
! 150: u_int8_t byte;
! 151:
! 152: i8259_imen |= (1 << pin);
! 153: #ifdef PIC_MASKDELAY
! 154: delay(10);
! 155: #endif
! 156: if (pin > 7) {
! 157: port = IO_ICU2 + 1;
! 158: byte = i8259_imen >> 8;
! 159: } else {
! 160: port = IO_ICU1 + 1;
! 161: byte = i8259_imen & 0xff;
! 162: }
! 163: outb(port, byte);
! 164: }
! 165:
! 166: static void
! 167: i8259_hwunmask(struct pic *pic, int pin)
! 168: {
! 169: unsigned port;
! 170: u_int8_t byte;
! 171:
! 172: disable_intr(); /* XXX */
! 173: i8259_imen &= ~(1 << pin);
! 174: #ifdef PIC_MASKDELAY
! 175: delay(10);
! 176: #endif
! 177: if (pin > 7) {
! 178: port = IO_ICU2 + 1;
! 179: byte = i8259_imen >> 8;
! 180: } else {
! 181: port = IO_ICU1 + 1;
! 182: byte = i8259_imen & 0xff;
! 183: }
! 184: outb(port, byte);
! 185: enable_intr();
! 186: }
! 187:
! 188: static void
! 189: i8259_reinit_irqs(void)
! 190: {
! 191: int irqs, irq;
! 192: struct cpu_info *ci = &cpu_info_primary;
! 193:
! 194: irqs = 0;
! 195: for (irq = 0; irq < NUM_LEGACY_IRQS; irq++)
! 196: if (ci->ci_isources[irq] != NULL)
! 197: irqs |= 1 << irq;
! 198: if (irqs >= 0x100) /* any IRQs >= 8 in use */
! 199: irqs |= 1 << IRQ_SLAVE;
! 200: i8259_imen = ~irqs;
! 201:
! 202: outb(IO_ICU1 + 1, i8259_imen);
! 203: outb(IO_ICU2 + 1, i8259_imen >> 8);
! 204: }
! 205:
! 206: static void
! 207: i8259_setup(struct pic *pic, struct cpu_info *ci, int pin, int idtvec, int type)
! 208: {
! 209: if (CPU_IS_PRIMARY(ci))
! 210: i8259_reinit_irqs();
! 211: }
! 212:
! 213: void
! 214: i8259_reinit(void)
! 215: {
! 216: i8259_default_setup();
! 217: i8259_reinit_irqs();
! 218: }
! 219:
! 220: unsigned
! 221: i8259_setmask(unsigned mask)
! 222: {
! 223: unsigned old = i8259_imen;
! 224:
! 225: i8259_imen = mask;
! 226: outb(IO_ICU1 + 1, i8259_imen);
! 227: outb(IO_ICU2 + 1, i8259_imen >> 8);
! 228: return old;
! 229: }
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