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/*
* Mach Operating System
* Copyright (c) 1991,1990 Carnegie Mellon University
* Copyright (c) 1991 IBM Corporation
* 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,
* and that the name IBM not be used in advertising or publicity
* pertaining to distribution of the software without specific, written
* prior permission.
*
* CARNEGIE MELLON AND IBM ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON AND IBM DISCLAIM 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.
*/
/*
* Clock interrupt.
*/
#include <mach/machine/eflags.h>
#include <kern/time_out.h>
#include <i386/thread.h>
#ifdef SYMMETRY
#include <sqt/intctl.h>
#endif
#if defined(AT386) || defined(iPSC386)
#include <i386/ipl.h>
#endif
#ifdef PS2
#include <i386/pic.h>
#include <i386/pio.h>
#endif /* PS2 */
extern void clock_interrupt();
extern char return_to_iret[];
void
#ifdef PS2
hardclock(iunit, ivect, old_ipl, ret_addr, regs)
int iunit; /* 'unit' number */
int ivect; /* interrupt number */
#else /* PS2 */
hardclock(iunit, old_ipl, ret_addr, regs)
int iunit; /* 'unit' number */
int old_ipl; /* old interrupt level */
#endif /* PS2 */
char * ret_addr; /* return address in interrupt handler */
struct i386_interrupt_state *regs;
/* saved registers */
{
if (ret_addr == return_to_iret)
/*
* Interrupt from user mode or from thread stack.
*/
clock_interrupt(tick, /* usec per tick */
(regs->efl & EFL_VM) || /* user mode */
((regs->cs & 0x03) != 0), /* user mode */
#if defined(PS2) || defined(LINUX_DEV)
FALSE /* ignore SPL0 */
#else /* PS2 */
old_ipl == SPL0 /* base priority */
#endif /* PS2 */
);
else
/*
* Interrupt from interrupt stack.
*/
clock_interrupt(tick, /* usec per tick */
FALSE, /* kernel mode */
FALSE); /* not SPL0 */
#ifdef LINUX_DEV
linux_timer_intr();
#endif
#ifdef PS2
/*
* Reset the clock interrupt line.
*/
outb(0x61, inb(0x61) | 0x80);
#endif /* PS2 */
}
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