spl.s

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1991,1990 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:        spl.s,v $
   29  * Revision 2.9  93/02/04  07:58:11  danner
   30  *      Convert asm comment "/" over to "/ *" "* /"
   31  *      [93/01/27            rvb]
   32  * 
   33  * Revision 2.8  91/06/06  17:04:01  jsb
   34  *      Added spldcm for i386ipsc.
   35  *      [91/05/13  16:53:38  jsb]
   36  * 
   37  * Revision 2.7  91/05/14  16:16:41  mrt
   38  *      Correcting copyright
   39  * 
   40  * Revision 2.6  91/05/08  12:42:29  dbg
   41  *      Put parentheses around substituted immediate expressions, so
   42  *      that they will pass through the GNU preprocessor.
   43  * 
   44  *      Add set_spl_noi to reset PIC masks but leave interrupts disabled
   45  *      (IF clear).
   46  *      [91/04/26  14:38:31  dbg]
   47  * 
   48  * Revision 2.5  91/02/05  17:14:45  mrt
   49  *      Changed to new Mach copyright
   50  *      [91/02/01  17:38:06  mrt]
   51  * 
   52  * Revision 2.4  90/12/20  16:36:50  jeffreyh
   53  *      Changes for __STDC__
   54  *      [90/12/07            jeffreyh]
   55  * 
   56  * Revision 2.3  90/11/26  14:48:50  rvb
   57  *      Change Prime copyright as per Peter J. Weyman authorization.
   58  *      [90/11/19            rvb]
   59  * 
   60  * Revision 2.2  90/05/03  15:37:36  dbg
   61  *      Stole from Prime.
   62  *      [90/02/14            dbg]
   63  * 
   64  */
   65 
   66 /*
   67 Copyright (c) 1988,1989 Prime Computer, Inc.  Natick, MA 01760
   68 All Rights Reserved.
   69 
   70 Permission to use, copy, modify, and distribute this
   71 software and its documentation for any purpose and
   72 without fee is hereby granted, provided that the above
   73 copyright notice appears in all copies and that both the
   74 copyright notice and this permission notice appear in
   75 supporting documentation, and that the name of Prime
   76 Computer, Inc. not be used in advertising or publicity
   77 pertaining to distribution of the software without
   78 specific, written prior permission.
   79 
   80 THIS SOFTWARE IS PROVIDED "AS IS", AND PRIME COMPUTER,
   81 INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
   82 SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   83 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  IN
   84 NO EVENT SHALL PRIME COMPUTER, INC.  BE LIABLE FOR ANY
   85 SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
   86 DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
   87 PROFITS, WHETHER IN ACTION OF CONTRACT, NEGLIGENCE, OR
   88 OTHER TORTIOUS ACTION, ARISING OUR OF OR IN CONNECTION
   89 WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   90 */
   91 
   92 #include <i386/asm.h>
   93 #include <i386/ipl.h>
   94 #include <i386/pic.h>
   95 
   96 /* *****************************************************************************
   97         SET_PIC_MASK : this routine is run to set the pic masks.  It is 
   98         implemented as a macro for efficiency reasons.
   99 ***************************************************************************** */
  100 
  101 #define SET_PIC_MASK                                                    \
  102                 movl    EXT(master_ocw),%edx    ;                       \
  103                 OUTB                            ;                       \
  104                 addw    $(SIZE_PIC),%dx         ;                       \
  105                 movb    %ah,%al                 ;                       \
  106                 OUTB
  107 
  108 /* *****************************************************************************
  109         SPLn : change interrupt priority level to that in %eax
  110         SPLOFF : disable all interrupts, saving interrupt flag
  111         SPLON: re-enable interrupt flag, undoes sploff()
  112         Warning: SPLn and SPLOFF aren`t nestable.  That is,
  113                 a = sploff();
  114                 ...
  115                 b = splmumble();
  116                 ...
  117                 splx(b);
  118                 ...
  119                 splon(a);
  120         is going to do the wrong thing.
  121 ***************************************************************************** */
  122 
  123 ENTRY(spl0)
  124         movl    $(SPL0), %eax
  125         jmp     EXT(set_spl)
  126 
  127 ENTRY(spl1)
  128 ENTRY(splsoftclock)
  129         movl    $(SPL1), %eax
  130         jmp     EXT(set_spl)
  131 
  132 ENTRY(spl2)
  133         movl    $(SPL2), %eax
  134         jmp     EXT(set_spl)
  135 
  136 ENTRY(spl3)
  137         movl    $(SPL3), %eax
  138         jmp     EXT(set_spl)
  139 
  140 ENTRY(splnet)
  141 ENTRY(splhdw)
  142 ENTRY(spl4)
  143         movl    $(SPL4), %eax
  144         jmp     EXT(set_spl)
  145 
  146 ENTRY(splbio)
  147 ENTRY(spldcm)
  148 ENTRY(spl5)
  149         movl    $(SPL5), %eax
  150         jmp     EXT(set_spl)
  151 
  152 ENTRY(spltty)
  153 ENTRY(spl6)
  154         movl    $(SPL6), %eax
  155         jmp     EXT(set_spl)
  156 
  157 ENTRY(splclock)
  158 ENTRY(splimp)
  159 ENTRY(splvm)
  160 ENTRY(splsched)
  161 ENTRY(splhigh)
  162 ENTRY(splhi)
  163 ENTRY(spl7)
  164 
  165         cli                             /*  3  disable interrupts */
  166         movl    EXT(curr_ipl),%eax      /*  4  */
  167         movl    $(IPLHI), EXT(curr_ipl) /*  2  */
  168         ret                             /* 10  */
  169 /*                                      ------ */
  170 /*                                        19 */
  171 
  172 ENTRY(sploff)                           /*  7  */
  173         pushf                           /*  2  Flags reg NOT accessable */
  174         popl    %eax                    /*  2  push onto stk, pop it into reg. */
  175         cli                             /*  3  DISABLE ALL INTERRUPTS */
  176         ret                             /*  7  */
  177 /*                                      ------ */
  178 /*                                        21 */
  179 
  180 ENTRY(splon)                            /*  7 */
  181         pushl   4(%esp)                 /*  4  Flags regs not directly settable. */
  182         popf                            /*  4  push value, pop into flags reg. */
  183                                         /*      IF ints were enabled before  */
  184                                         /*      then they are re-enabled now. */
  185         ret                             /*  7  */
  186 /*                                      ------ */
  187 /*                                        22 */
  188 
  189 /* ******************************************************************************
  190          SPL : this routine sets the interrupt priority level, it is called from
  191          one of the above spln subroutines ONLY, NO-ONE should EVER call set_spl
  192          directly as it assumes that the parameters passed in are gospel.
  193         SPLX    : This routine is used to set the ipl BACK to a level it was at
  194         before spln() was called, which in turn calls set_spl(), which returns
  195         (via %eax) the value of the curr_ipl prior to spln() being called, this 
  196         routine is passed this level and so must check that it makes sense and 
  197         if so then simply calls set_spl() with the appropriate interrupt level.
  198 ***************************************************************************** */
  199 
  200 ENTRY(splx)
  201         movl    0x04(%esp),%eax         /*  4  get interrupt level from stack */
  202 
  203         cmpl    $0x00,%eax              /*  2  check if  < 0 */
  204         jl      splxpanic               /*  3  */
  205 
  206         cmpl    $(SPLHI),%eax           /*  2  check if too high */
  207         ja      splxpanic               /*  3  */
  208 /*                                      ------ */
  209 /*                                        14 */
  210 
  211 /* *****************************************************************************
  212         SET_SPL : This routine sets curr_spl, ipl, and the pic_mask as 
  213         appropriate, basically given an spl# to adopt, see if it is the same as
  214         the  old spl#, if so return. If the numbers are different, then set 
  215         curr_spl, now check the corresponding ipl for the spl requested, if they
  216         are the same then return otherwise set the new ipl and set the pic masks
  217         accordingly.
  218 ***************************************************************************** */
  219 
  220         .globl  EXT(set_spl)
  221 LEXT(set_spl)
  222         pushl   %ebp                    /* 2  */
  223         movl    %esp,%ebp               /* 2  */
  224         cli                             /* 3  disable interrupts */
  225         movl    EXT(curr_ipl), %edx     /* 4  get OLD ipl level */
  226         pushl   %edx                    /* 2  save old level for return */
  227 set_spl_recur:
  228         movl    %eax,EXT(curr_ipl)      /* 4  set NEW ipl level */
  229         cmpl    $(SPLHI), %eax          /*  2  if SPLHI */
  230         je      spl_intoff              /*  3  return with interrupt off */
  231         cmpl    $(SPL0), %eax           /* if SPL0 */
  232         jne     0f                      /* and */
  233         cmpl    $0,EXT(dotimein)        /* softclock request, */
  234         jz      0f                      /* take a softclock interrupt first */
  235         call    do_soft_clock
  236         jmp     set_spl_recur
  237 0:
  238         movw    EXT(pic_mask)(,%eax,2), %ax /* 5  */
  239         cmpw    EXT(curr_pic_mask),%ax  /* 5  */
  240         je      spl_return              /* 7  */
  241         movw    %ax, EXT(curr_pic_mask)
  242         SET_PIC_MASK                    /*16  */
  243 spl_return:
  244         sti                             /* 3  */
  245 spl_intoff:
  246         popl    %eax                    /* 2  return old level */
  247         pop     %ebp                    /* 2  */
  248         ret                             /*10  */
  249 /*                                      ----- */
  250 /*                                       79 */
  251 
  252 splxpanic:
  253         pushl   EXT(curr_ipl)           /* current level */
  254         pushl   %eax                    /* new level */
  255         pushl   $splxpanic2
  256         call    EXT(panic)
  257         hlt
  258 
  259         .data
  260 splxpanic2:
  261         String  "splx(old %x, new %x): logic error in locore.s\n"
  262         .byte   0
  263         .text
  264 
  265 /*
  266  * Take a softclock interrupt request.
  267  */
  268 do_soft_clock:
  269         movl    $0,EXT(dotimein)        /*      clear softclock request */
  270         movl    $(SPL1),%eax
  271         call    EXT(set_spl)            /*      run at spl1 */
  272         call    EXT(softclock)          /*      run softclock interrupt */
  273         movl    $(SPL0),%eax            /*      return to spl0 */
  274         cli                             /*      disable interrupts */
  275         ret
  276 
  277 ENTRY(setsoftclock)
  278         movl    $1,EXT(dotimein)        /* request soft-clock interrupt */
  279         ret
  280 
  281         .data
  282         .globl  EXT(dotimein)
  283 LEXT(dotimein)
  284         .long   0
  285         .text
  286 
  287 /*
  288  * Set SPL, but leave interrupts disabled.  Called when returning
  289  * from interrupt.  Interrupts are already disabled.
  290  * New interrupt level is in %eax;
  291  * can't be SPLHI.
  292  */
  293         .globl  EXT(set_spl_noi)
  294 LEXT(set_spl_noi)
  295         movl    %eax,EXT(curr_ipl)      /* set new SPL level */
  296         cmpl    $(SPL0),%eax            /* if SPL0 */
  297         jne     0f                      /* and */
  298         cmpl    $0,EXT(dotimein)        /* softclock request, */
  299         jz      0f                      /* take a softclock interrupt first */
  300         call    do_soft_clock
  301         jmp     EXT(set_spl_noi)
  302 0:
  303         movw    EXT(pic_mask)(,%eax,2), %ax     /* get new pic mask */
  304         cmpw    EXT(curr_pic_mask),%ax  /* if different, */
  305         je      1f
  306         movw    %ax,EXT(curr_pic_mask)  /* change it */
  307         SET_PIC_MASK
  308 1:
  309         ret
  310
Cache object: 431caacb01c599c0ace2a345a85bee9d
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FreeBSD/Linux Kernel Cross Reference sys/i386/spl.s

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