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/arm/arm/fiq.c

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    1 /*      $NetBSD: fiq.c,v 1.5 2002/04/03 23:33:27 thorpej Exp $  */
    2 
    3 /*-
    4  * Copyright (c) 2001, 2002 Wasabi Systems, Inc.
    5  * All rights reserved.
    6  *
    7  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  * 3. All advertising materials mentioning features or use of this software
   18  *    must display the following acknowledgement:
   19  *      This product includes software developed for the NetBSD Project by
   20  *      Wasabi Systems, Inc.
   21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
   22  *    or promote products derived from this software without specific prior
   23  *    written permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
   26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
   29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   35  * POSSIBILITY OF SUCH DAMAGE.
   36  */
   37 
   38 #include <sys/cdefs.h>
   39 __FBSDID("$FreeBSD: releng/6.2/sys/arm/arm/fiq.c 143682 2005-03-16 07:56:21Z jmg $");
   40 
   41 #include <sys/param.h>
   42 #include <sys/systm.h>
   43 
   44 #include <machine/cpufunc.h>
   45 #include <machine/fiq.h>
   46 #include <vm/vm.h>
   47 #include <machine/pcb.h>
   48 #include <vm/pmap.h>
   49 #include <machine/cpu.h>
   50 
   51 TAILQ_HEAD(, fiqhandler) fiqhandler_stack =
   52     TAILQ_HEAD_INITIALIZER(fiqhandler_stack);
   53 
   54 extern char fiqvector[];
   55 extern char fiq_nullhandler[], fiq_nullhandler_end[];
   56 
   57 #define IRQ_BIT         I32_bit
   58 #define FIQ_BIT         F32_bit
   59 
   60 /*
   61  * fiq_installhandler:
   62  *
   63  *      Actually install the FIQ handler down at the FIQ vector.
   64  *
   65  *      Note: If the FIQ is invoked via an extra layer of
   66  *      indirection, the actual FIQ code store lives in the
   67  *      data segment, so there is no need to manipulate
   68  *      the vector page's protection.
   69  */
   70 static void
   71 fiq_installhandler(void *func, size_t size)
   72 {
   73 #if !defined(__ARM_FIQ_INDIRECT)
   74         vector_page_setprot(VM_PROT_READ|VM_PROT_WRITE);
   75 #endif
   76 
   77         memcpy(vector_page + fiqvector, func, size);
   78 
   79 #if !defined(__ARM_FIQ_INDIRECT)
   80         vector_page_setprot(VM_PROT_READ);
   81         cpu_icache_sync_range((vm_offset_t) fiqvector, size);
   82 #endif
   83 }
   84 
   85 /*
   86  * fiq_claim:
   87  *
   88  *      Claim the FIQ vector.
   89  */
   90 int
   91 fiq_claim(struct fiqhandler *fh)
   92 {
   93         struct fiqhandler *ofh;
   94         u_int oldirqstate;
   95         int error = 0;
   96 
   97         if (fh->fh_size > 0x100)
   98                 return (EFBIG);
   99 
  100         oldirqstate = disable_interrupts(FIQ_BIT);
  101 
  102         if ((ofh = TAILQ_FIRST(&fiqhandler_stack)) != NULL) {
  103                 if ((ofh->fh_flags & FH_CANPUSH) == 0) {
  104                         error = EBUSY;
  105                         goto out;
  106                 }
  107 
  108                 /* Save the previous FIQ handler's registers. */
  109                 if (ofh->fh_regs != NULL)
  110                         fiq_getregs(ofh->fh_regs);
  111         }
  112 
  113         /* Set FIQ mode registers to ours. */
  114         if (fh->fh_regs != NULL)
  115                 fiq_setregs(fh->fh_regs);
  116 
  117         TAILQ_INSERT_HEAD(&fiqhandler_stack, fh, fh_list);
  118 
  119         /* Now copy the actual handler into place. */
  120         fiq_installhandler(fh->fh_func, fh->fh_size);
  121 
  122         /* Make sure FIQs are enabled when we return. */
  123         oldirqstate &= ~FIQ_BIT;
  124 
  125  out:
  126         restore_interrupts(oldirqstate);
  127         return (error);
  128 }
  129 
  130 /*
  131  * fiq_release:
  132  *
  133  *      Release the FIQ vector.
  134  */
  135 void
  136 fiq_release(struct fiqhandler *fh)
  137 {
  138         u_int oldirqstate;
  139         struct fiqhandler *ofh;
  140 
  141         oldirqstate = disable_interrupts(FIQ_BIT);
  142 
  143         /*
  144          * If we are the currently active FIQ handler, then we
  145          * need to save our registers and pop the next one back
  146          * into the vector.
  147          */
  148         if (fh == TAILQ_FIRST(&fiqhandler_stack)) {
  149                 if (fh->fh_regs != NULL)
  150                         fiq_getregs(fh->fh_regs);
  151                 TAILQ_REMOVE(&fiqhandler_stack, fh, fh_list);
  152                 if ((ofh = TAILQ_FIRST(&fiqhandler_stack)) != NULL) {
  153                         if (ofh->fh_regs != NULL)
  154                                 fiq_setregs(ofh->fh_regs);
  155                         fiq_installhandler(ofh->fh_func, ofh->fh_size);
  156                 }
  157         } else
  158                 TAILQ_REMOVE(&fiqhandler_stack, fh, fh_list);
  159 
  160         if (TAILQ_FIRST(&fiqhandler_stack) == NULL) {
  161                 /* Copy the NULL handler back down into the vector. */
  162                 fiq_installhandler(fiq_nullhandler,
  163                     (size_t)(fiq_nullhandler_end - fiq_nullhandler));
  164 
  165                 /* Make sure FIQs are disabled when we return. */
  166                 oldirqstate |= FIQ_BIT;
  167         }
  168 
  169         restore_interrupts(oldirqstate);
  170 }

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