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eb51e37703
Restore the simple leap year calculation as a macro and document it so that it doesn't become complicated again. The simple version works for all leap years covered by 32-bit time_t's. The complicated version doesn't work for all leap years covered by 64-bit time_t's since among other reasons, the solar system is not stable for long enough. Fix declarations. Nuke spinwait().
98 lines
3.4 KiB
C
98 lines
3.4 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)icu.h 5.6 (Berkeley) 5/9/91
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* $Id: icu.h,v 1.4 1994/09/16 13:33:38 davidg Exp $
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*/
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/*
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* AT/386 Interrupt Control constants
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* W. Jolitz 8/89
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*/
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#ifndef _I386_ISA_ICU_H_
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#define _I386_ISA_ICU_H_
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#ifndef LOCORE
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/*
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* Interrupt "level" mechanism variables, masks, and macros
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*/
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extern unsigned imen; /* interrupt mask enable */
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#define INTREN(s) (imen &= ~(s), SET_ICUS())
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#define INTRDIS(s) (imen |= (s), SET_ICUS())
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#define INTRMASK(msk,s) (msk |= (s))
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#if 0
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#define SET_ICUS() (outb(IO_ICU1 + 1, imen), outb(IU_ICU2 + 1, imen >> 8))
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#else
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/*
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* XXX - IO_ICU* are defined in isa.h, not icu.h, and nothing much bothers to
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* include isa.h, while too many things include icu.h.
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*/
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#define SET_ICUS() (outb(0x21, imen), outb(0xa1, imen >> 8))
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#endif
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#endif
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/*
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* Interrupt enable bits - in normal order of priority (which we change)
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*/
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#define IRQ0 0x0001 /* highest priority - timer */
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#define IRQ1 0x0002
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#define IRQ_SLAVE 0x0004
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#define IRQ8 0x0100
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#define IRQ9 0x0200
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#define IRQ2 IRQ9
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#define IRQ10 0x0400
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#define IRQ11 0x0800
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#define IRQ12 0x1000
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#define IRQ13 0x2000
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#define IRQ14 0x4000
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#define IRQ15 0x8000
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#define IRQ3 0x0008 /* this is highest after rotation */
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#define IRQ4 0x0010
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#define IRQ5 0x0020
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#define IRQ6 0x0040
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#define IRQ7 0x0080 /* lowest - parallel printer */
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/*
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* Interrupt Control offset into Interrupt descriptor table (IDT)
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*/
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#define ICU_OFFSET 32 /* 0-31 are processor exceptions */
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#define ICU_LEN 16 /* 32-47 are ISA interrupts */
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#endif /* !_I386_ISA_ICU_H_ */
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