From 25062ba061871945759b3baa833fe64969383e40 Mon Sep 17 00:00:00 2001
From: rgrimes <rgrimes@FreeBSD.org>
Date: Sat, 12 Jun 1993 14:58:17 +0000
Subject: Initial import, 0.1 + pk 0.2.4-B1

---
 sys/i386/isa/icu.h | 109 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 sys/i386/isa/icu.h

(limited to 'sys/i386/isa/icu.h')

diff --git a/sys/i386/isa/icu.h b/sys/i386/isa/icu.h
new file mode 100644
index 0000000..4866d8d
--- /dev/null
+++ b/sys/i386/isa/icu.h
@@ -0,0 +1,109 @@
+/*-
+ * Copyright (c) 1990 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. 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.
+ *
+ *	@(#)icu.h	5.6 (Berkeley) 5/9/91
+ *
+ * PATCHES MAGIC                LEVEL   PATCH THAT GOT US HERE
+ * --------------------         -----   ----------------------
+ * CURRENT PATCH LEVEL:         1       00158
+ * --------------------         -----   ----------------------
+ *
+ * 25 Apr 93	Bruce Evans		New fast interrupt code (intr-0.1)
+ */
+
+/*
+ * AT/386 Interrupt Control constants
+ * W. Jolitz 8/89
+ */
+
+#ifndef	__ICU__
+#define	__ICU__
+
+#ifndef	LOCORE
+
+/*
+ * Interrupt "level" mechanism variables, masks, and macros
+ */
+extern	unsigned imen;		/* interrupt mask enable */
+extern	unsigned cpl;		/* current priority level mask */
+
+extern	unsigned highmask;	/* group of interrupts masked with splhigh() */
+extern	unsigned ttymask;	/* group of interrupts masked with spltty() */
+extern	unsigned biomask;	/* group of interrupts masked with splbio() */
+extern	unsigned netmask;	/* group of interrupts masked with splimp() */
+
+#define	INTREN(s)	(imen &= ~(s), SET_ICUS())
+#define	INTRDIS(s)	(imen |= (s), SET_ICUS())
+#define	INTRMASK(msk,s)	(msk |= (s))
+#if 0
+#define SET_ICUS()	(outb(IO_ICU1 + 1, imen), outb(IU_ICU2 + 1, imen >> 8))
+#else
+/*
+ * XXX - IO_ICU* are defined in isa.h, not icu.h, and nothing much bothers to
+ * include isa.h, while too many things include icu.h.
+ */
+#define SET_ICUS()	(outb(0x21, imen), outb(0xa1, imen >> 8))
+#endif
+
+#endif
+
+/*
+ * Interrupt enable bits -- in order of priority
+ */
+#define	IRQ0		0x0001		/* highest priority - timer */
+#define	IRQ1		0x0002
+#define	IRQ_SLAVE	0x0004
+#define	IRQ8		0x0100
+#define	IRQ9		0x0200
+#define	IRQ2		IRQ9
+#define	IRQ10		0x0400
+#define	IRQ11		0x0800
+#define	IRQ12		0x1000
+#define	IRQ13		0x2000
+#define	IRQ14		0x4000
+#define	IRQ15		0x8000
+#define	IRQ3		0x0008
+#define	IRQ4		0x0010
+#define	IRQ5		0x0020
+#define	IRQ6		0x0040
+#define	IRQ7		0x0080		/* lowest - parallel printer */
+
+/*
+ * Interrupt Control offset into Interrupt descriptor table (IDT)
+ */
+#define	ICU_OFFSET	32		/* 0-31 are processor exceptions */
+#define	ICU_LEN		16		/* 32-47 are ISA interrupts */
+
+#endif	__ICU__
-- 
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