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pic_splfuncs.c revision 1.5 
      1 /*	$NetBSD: pic_splfuncs.c,v 1.5 2014/04/16 22:44:42 matt Exp $	*/
      2 /*-
      3  * Copyright (c) 2008 The NetBSD Foundation, Inc.
      4  * All rights reserved.
      5  *
      6  * This code is derived from software contributed to The NetBSD Foundation
      7  * by Matt Thomas.
      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  *
     18  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     20  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     21  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     22  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     28  * POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 #include <sys/cdefs.h>
     31 __KERNEL_RCSID(0, "$NetBSD: pic_splfuncs.c,v 1.5 2014/04/16 22:44:42 matt Exp $");
     32 
     33 #define _INTR_PRIVATE
     34 #include <sys/param.h>
     35 #include <sys/atomic.h>
     36 #include <sys/evcnt.h>
     37 #include <sys/kernel.h>
     38 
     39 #include <dev/cons.h>
     40 
     41 #include <arm/armreg.h>
     42 #include <arm/cpu.h>
     43 #include <arm/cpufunc.h>
     44 
     45 #include <arm/pic/picvar.h>
     46 
     47 
     48 int
     49 _splraise(int newipl)
     50 {
     51 	struct cpu_info * const ci = curcpu();
     52 	const int oldipl = ci->ci_cpl;
     53 	KASSERT(newipl < NIPL);
     54 	if (newipl > ci->ci_cpl) {
     55 		pic_set_priority(ci, newipl);
     56 	}
     57 	return oldipl;
     58 }
     59 int
     60 _spllower(int newipl)
     61 {
     62 	struct cpu_info * const ci = curcpu();
     63 	const int oldipl = ci->ci_cpl;
     64 	KASSERT(panicstr || newipl <= ci->ci_cpl);
     65 	if (newipl < ci->ci_cpl) {
     66 		register_t psw = cpsid(I32_bit);
     67 		ci->ci_intr_depth++;
     68 		pic_do_pending_ints(psw, newipl, NULL);
     69 		ci->ci_intr_depth--;
     70 		if ((psw & I32_bit) == 0)
     71 			cpsie(I32_bit);
     72 		cpu_dosoftints();
     73 	}
     74 	return oldipl;
     75 }
     76 
     77 void
     78 splx(int savedipl)
     79 {
     80 	struct cpu_info * const ci = curcpu();
     81 	KASSERT(savedipl < NIPL);
     82 
     83 	if (__predict_false(savedipl == ci->ci_cpl)) {
     84 		return;
     85 	}
     86 
     87 	register_t psw = cpsid(I32_bit);
     88 	KASSERTMSG(panicstr != NULL || savedipl < ci->ci_cpl,
     89 	    "splx(%d) to a higher ipl than %d", savedipl, ci->ci_cpl);
     90 
     91 	ci->ci_intr_depth++;
     92 	pic_do_pending_ints(psw, savedipl, NULL);
     93 	ci->ci_intr_depth--;
     94 	KASSERTMSG(ci->ci_cpl == savedipl, "cpl %d savedipl %d",
     95 	    ci->ci_cpl, savedipl);
     96 	if ((psw & I32_bit) == 0)
     97 		cpsie(I32_bit);
     98 	cpu_dosoftints();
     99 	KASSERTMSG(ci->ci_cpl == savedipl, "cpl %d savedipl %d",
    100 	    ci->ci_cpl, savedipl);
    101 }
    102