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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/mach_clock.h>
#include <i386/thread.h>
#if defined(AT386) || defined(ATX86_64)
#include <i386/ipl.h>
#endif
#ifdef LINUX_DEV
#include <linux/dev/glue/glue.h>
#endif
extern char return_to_iret[];
void
hardclock(int iunit, /* 'unit' number */
int old_ipl, /* old interrupt level */
int irq, /* irq number */
const 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(LINUX_DEV)
FALSE, /* ignore SPL0 */
#else /* LINUX_DEV */
old_ipl == SPL0, /* base priority */
#endif /* LINUX_DEV */
regs->eip); /* interrupted eip */
else
/*
* Interrupt from interrupt stack.
*/
clock_interrupt(tick, /* usec per tick */
FALSE, /* kernel mode */
FALSE, /* not SPL0 */
0); /* interrupted eip */
#ifdef LINUX_DEV
linux_timer_intr();
#endif /* LINUX_DEV */
}
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