/kern/arm32/shark/pic.c
C | 234 lines | 85 code | 24 blank | 125 comment | 11 complexity | a008ecbd149d8f20b290d21e61d3b965 MD5 | raw file
Possible License(s): GPL-2.0
- /*
- * Copyright (c) 1994-1999 University of Utah and the Flux Group.
- * All rights reserved.
- *
- * This file is part of the Flux OSKit. The OSKit is free software, also known
- * as "open source;" you can redistribute it and/or modify it under the terms
- * of the GNU General Public License (GPL), version 2, as published by the Free
- * Software Foundation (FSF). To explore alternate licensing terms, contact
- * the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
- *
- * The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have
- * received a copy of the GPL along with the OSKit; see the file COPYING. If
- * not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
- */
- /*
- * Copyright 1997
- * Digital Equipment Corporation. All rights reserved.
- *
- * This software is furnished under license and may be used and
- * copied only in accordance with the following terms and conditions.
- * Subject to these conditions, you may download, copy, install,
- * use, modify and distribute this software in source and/or binary
- * form. No title or ownership is transferred hereby.
- *
- * 1) Any source code used, modified or distributed must reproduce
- * and retain this copyright notice and list of conditions as
- * they appear in the source file.
- *
- * 2) No right is granted to use any trade name, trademark, or logo of
- * Digital Equipment Corporation. Neither the "Digital Equipment
- * Corporation" name nor any trademark or logo of Digital Equipment
- * Corporation may be used to endorse or promote products derived
- * from this software without the prior written permission of
- * Digital Equipment Corporation.
- *
- * 3) This software is provided "AS-IS" and any express or implied
- * warranties, including but not limited to, any implied warranties
- * of merchantability, fitness for a particular purpose, or
- * non-infringement are disclaimed. In no event shall DIGITAL be
- * liable for any damages whatsoever, and in particular, DIGITAL
- * shall not be liable for special, indirect, consequential, or
- * incidental damages or damages for lost profits, loss of
- * revenue or loss of use, whether such damages arise in contract,
- * negligence, tort, under statute, in equity, at law or otherwise,
- * even if advised of the possibility of such damage.
- */
- /*
- * Mach Operating System
- * Copyright (c) 1991,1990,1989 Carnegie Mellon University
- * All Rights Reserved.
- *
- * Permission to use, copy, modify and distribute this software and its
- * documentation is hereby granted, provided that both the copyright
- * notice and this permission notice appear in all copies of the
- * software, derivative works or modified versions, and any portions
- * thereof, and that both notices appear in supporting documentation.
- *
- * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
- * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
- * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
- *
- * Carnegie Mellon requests users of this software to return to
- *
- * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
- * School of Computer Science
- * Carnegie Mellon University
- * Pittsburgh PA 15213-3890
- *
- * any improvements or extensions that they make and grant Carnegie Mellon
- * the rights to redistribute these changes.
- */
- /*
- Copyright (c) 1988,1989 Prime Computer, Inc. Natick, MA 01760
- All Rights Reserved.
- Permission to use, copy, modify, and distribute this
- software and its documentation for any purpose and
- without fee is hereby granted, provided that the above
- copyright notice appears in all copies and that both the
- copyright notice and this permission notice appear in
- supporting documentation, and that the name of Prime
- Computer, Inc. not be used in advertising or publicity
- pertaining to distribution of the software without
- specific, written prior permission.
- THIS SOFTWARE IS PROVIDED "AS IS", AND PRIME COMPUTER,
- INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
- SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN
- NO EVENT SHALL PRIME COMPUTER, INC. BE LIABLE FOR ANY
- SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
- DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
- PROFITS, WHETHER IN ACTION OF CONTRACT, NEGLIGENCE, OR
- OTHER TORTIOUS ACTION, ARISING OUR OF OR IN CONNECTION
- WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
- /*
- * Routines for manipulating the 8259A Programmable Interrupt
- * Controller (PIC)
- */
- #include <sys/types.h>
- #include <oskit/arm32/pio.h>
- #include <oskit/arm32/proc_reg.h>
- #include <oskit/arm32/shark/pic.h>
- #include <assert.h>
- /*
- * Initialize the PIC,
- * Note that we don't disable all intrs here, you can call pic_disable_all.
- *
- * XXX the original Mach version put delays after the outb's in this
- * function, so we do the same thing (FreeBSD doesn't.) Don't know if
- * this is still required, the enable/disable functions below work
- * like champs without it.
- */
- void
- pic_init(unsigned char master_base, unsigned char slave_base)
- {
- /* Initialize the master. */
- outb_p(MASTER_ICW, PICM_ICW1|LEVL_TRIGGER);
- outb_p(MASTER_OCW, master_base);
- outb_p(MASTER_OCW, PICM_ICW3);
- outb_p(MASTER_OCW, PICM_ICW4|AUTO_EOI_MOD);
- outb_p(MASTER_ICW, 0x68); /* special mask mode (if available) */
- outb_p(MASTER_ICW, 0x0a); /* Read IRR, not ISR */
- /* Initialize the slave. */
- outb_p(SLAVES_ICW, PICS_ICW1|LEVL_TRIGGER);
- outb_p(SLAVES_OCW, slave_base);
- outb_p(SLAVES_OCW, PICS_ICW3);
- outb_p(SLAVES_OCW, PICS_ICW4|AUTO_EOI_MOD);
- outb_p(SLAVES_ICW, 0x68); /* special mask mode (if available) */
- outb_p(SLAVES_ICW, 0x0a); /* Read IRR, not ISR */
- /* Ack any bogus intrs by setting the End Of Interrupt bit. */
- outb_p(MASTER_ICW, NON_SPEC_EOI);
- outb_p(SLAVES_ICW, NON_SPEC_EOI);
- }
- /*
- * Enable the irq by clearing the appropriate bit in the PIC.
- */
- void
- pic_enable_irq(unsigned char irq)
- {
- unsigned int enabled = interrupts_enabled();
- assert(irq < 16);
- disable_interrupts();
- if (irq < 8)
- outb(MASTER_OCW, inb(MASTER_OCW) & ~(1 << irq));
- else {
- /* Enable the cascade line on the master. */
- outb(MASTER_OCW, inb(MASTER_OCW) & ~(1 << 2));
- irq -= 8;
- outb(SLAVES_OCW, inb(SLAVES_OCW) & ~(1 << irq));
- }
- if (enabled)
- enable_interrupts();
- }
- /*
- * Disable the irq by setting the appropriate bit in the PIC.
- */
- void
- pic_disable_irq(unsigned char irq)
- {
- unsigned int enabled = interrupts_enabled();
- assert(irq < 16);
- disable_interrupts();
- if (irq < 8)
- outb(MASTER_OCW, inb(MASTER_OCW) | (1 << irq));
- else {
- irq -= 8;
- outb(SLAVES_OCW, inb(SLAVES_OCW) | (1 << irq));
- }
- if (enabled)
- enable_interrupts();
- }
- /*
- * Check to see if the specified irq is currently pending.
- */
- int
- pic_test_irq(unsigned char irq)
- {
- assert(irq < 16);
- if (irq < 8)
- return inb(MASTER_ICW) & (1 << irq);
- else {
- irq -= 8;
- return inb(SLAVES_ICW) & (1 << irq);
- }
- }
- int
- pic_get_irqmask(void)
- {
- return (inb(SLAVES_OCW) << 8) | inb(MASTER_OCW);
- }
- void
- pic_set_irqmask(int mask)
- {
- unsigned int enabled, m, s;
- m = mask & 0xff;
- s = (mask >> 8) & 0xff;
- /* ensure that slave PIC is enabled if necessary */
- if (s != PICS_MASK)
- m &= ~(1 << 2);
- enabled = interrupts_enabled();
- disable_interrupts();
- outb(MASTER_OCW, m);
- outb(SLAVES_OCW, s);
- if (enabled)
- enable_interrupts();
- }