/* $OpenBSD: i8259.c,v 1.13 2026/01/15 15:43:44 sf Exp $ */ /* $NetBSD: i8259.c,v 1.2 2003/03/02 18:27:15 fvdl Exp $ */ /* * Copyright 2002 (c) Wasabi Systems, Inc. * All rights reserved. * * Written by Frank van der Linden for Wasabi Systems, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed for the NetBSD Project by * Wasabi Systems, Inc. * 4. The name of Wasabi Systems, Inc. may not be used to endorse * or promote products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /*- * Copyright (c) 1991 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * William Jolitz. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)isa.c 7.2 (Berkeley) 5/13/91 */ #include <sys/param.h> #include <dev/isa/isareg.h> #include <machine/pio.h> #include <machine/cpufunc.h> #include <machine/cpu.h> #include <machine/pic.h> #include <machine/i8259.h> static void i8259_hwmask(struct pic *, int); static void i8259_hwunmask(struct pic *, int); static void i8259_setup(struct pic *, struct cpu_info *, int, int, int); static void i8259_reinit_irqs(void); unsigned i8259_imen; /* * Perhaps this should be made into a real device. */ struct pic i8259_pic = { {0, {NULL}, NULL, 0, "pic0", NULL, 0, 0}, PIC_I8259, #ifdef MULTIPROCESSOR {}, #endif i8259_hwmask, i8259_hwunmask, i8259_setup, i8259_setup, NULL, i8259_stubs, i8259_stubs, }; void i8259_default_setup(void) { outb(IO_ICU1, 0x11); /* reset; program device, four bytes */ outb(IO_ICU1+1, ICU_OFFSET); /* starting at this vector index */ outb(IO_ICU1+1, 1 << IRQ_SLAVE); /* slave on line 2 */ outb(IO_ICU1+1, 1); /* 8086 mode */ outb(IO_ICU1+1, 0xff); /* leave interrupts masked */ outb(IO_ICU1, 0x68); /* special mask mode (if available) */ outb(IO_ICU1, 0x0a); /* Read IRR by default. */ outb(IO_ICU2, 0x11); /* reset; program device, four bytes */ outb(IO_ICU2+1, ICU_OFFSET+8); /* staring at this vector index */ outb(IO_ICU2+1, IRQ_SLAVE); outb(IO_ICU2+1, 1); /* 8086 mode */ outb(IO_ICU2+1, 0xff); /* leave interrupts masked */ outb(IO_ICU2, 0x68); /* special mask mode (if available) */ outb(IO_ICU2, 0x0a); /* Read IRR by default. */ } static void i8259_hwmask(struct pic *pic, int pin) { unsigned port; u_int8_t byte; i8259_imen |= (1 << pin); if (pin > 7) { port = IO_ICU2 + 1; byte = i8259_imen >> 8; } else { port = IO_ICU1 + 1; byte = i8259_imen & 0xff; } outb(port, byte); } static void i8259_hwunmask(struct pic *pic, int pin) { unsigned port; u_int8_t byte; u_long s; s = intr_disable(); i8259_imen &= ~(1 << pin); if (pin > 7) { port = IO_ICU2 + 1; byte = i8259_imen >> 8; } else { port = IO_ICU1 + 1; byte = i8259_imen & 0xff; } outb(port, byte); intr_restore(s); } static void i8259_reinit_irqs(void) { int irqs, irq; struct cpu_info *ci = &cpu_info_primary; irqs = 0; for (irq = 0; irq < NUM_LEGACY_IRQS; irq++) if (ci->ci_isources[irq] != NULL) irqs |= 1 << irq; if (irqs >= 0x100) /* any IRQs >= 8 in use */ irqs |= 1 << IRQ_SLAVE; i8259_imen = ~irqs; outb(IO_ICU1 + 1, i8259_imen); outb(IO_ICU2 + 1, i8259_imen >> 8); } static void i8259_setup(struct pic *pic, struct cpu_info *ci, int pin, int idtvec, int type) { if (CPU_IS_PRIMARY(ci)) i8259_reinit_irqs(); }
