The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/hardclock.s

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1993 Carnegie Mellon University
    4  * All Rights Reserved.
    5  * 
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  * 
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  * 
   16  * Carnegie Mellon requests users of this software to return to
   17  * 
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  * 
   23  * any improvements or extensions that they make and grant Carnegie Mellon 
   24  * the rights to redistribute these changes.
   25  */
   26 /*
   27  * HISTORY
   28  * $Log:        hardclock.s,v $
   29  * Revision 2.2  93/11/17  16:35:45  dbg
   30  *      Created.
   31  *      [93/02/10            dbg]
   32  * 
   33  */
   34 
   35 #include <platforms.h>
   36 
   37 #include <i386/eflags.h>
   38 #include <assym.s>
   39 
   40 /*
   41  *      Assembler version of system clock interrupt
   42  *      routine.
   43  *
   44  * On stack:
   45  * esp->        return address to interrupt dispatcher
   46  *              unit number (unneeded on return)
   47  * [ PS2 only   interrupt vector number ]
   48  *              saved SPL
   49  *              return address from interrupt dispatcher
   50  *              pointer to saved registers
   51  */
   52 
   53 #ifdef  PS2
   54 #define RET_OFFSET      16
   55 #else   /* not PS2 */
   56 #define RET_OFFSET      12
   57 #endif
   58 
   59         .globl  _hardclock
   60 _hardclock:
   61         movl    RET_OFFSET(%esp),%eax   /* get dispatcher return address */
   62         cmpl    $_return_to_iret,%eax   /* from interrupt level? */
   63         jne     hardclock_system        /* in kernel if so */
   64         movl    RET_OFFSET+4(%esp),%eax /* point to registers */
   65         testl   $(EFL_VM),I_EFL(%eax)   /* in V86 mode? */
   66         jnz     hardclock_user          /* in user if so */
   67         testb   $3,I_CS(%eax)           /* protection level 3? */
   68         jnz     hardclock_user          /* in user if so */
   69 
   70 /* clock interrupt from system */
   71 
   72 hardclock_system:
   73         movl    $0,4(%esp)              /* set usermode = FALSE */
   74         jmp     _sys_clock_interrupt    /* take system clock interrupt */
   75 
   76 /* clock interrupt from user */
   77 
   78 hardclock_user:
   79         movl    $1,4(%esp)              /* set usermode = TRUE */
   80         jmp     _sys_clock_interrupt    /* take system clock interrupt */

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