102 lines
3.1 KiB
C
102 lines
3.1 KiB
C
/* $NetBSD: pic_splfuncs.c,v 1.5 2014/04/16 22:44:42 matt Exp $ */
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/*-
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* Copyright (c) 2008 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matt Thomas.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: pic_splfuncs.c,v 1.5 2014/04/16 22:44:42 matt Exp $");
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#define _INTR_PRIVATE
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#include <sys/param.h>
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#include <sys/atomic.h>
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#include <sys/evcnt.h>
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#include <sys/kernel.h>
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#include <dev/cons.h>
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#include <arm/armreg.h>
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#include <arm/cpu.h>
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#include <arm/cpufunc.h>
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#include <arm/pic/picvar.h>
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int
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_splraise(int newipl)
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{
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struct cpu_info * const ci = curcpu();
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const int oldipl = ci->ci_cpl;
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KASSERT(newipl < NIPL);
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if (newipl > ci->ci_cpl) {
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pic_set_priority(ci, newipl);
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}
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return oldipl;
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}
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int
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_spllower(int newipl)
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{
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struct cpu_info * const ci = curcpu();
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const int oldipl = ci->ci_cpl;
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KASSERT(panicstr || newipl <= ci->ci_cpl);
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if (newipl < ci->ci_cpl) {
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register_t psw = cpsid(I32_bit);
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ci->ci_intr_depth++;
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pic_do_pending_ints(psw, newipl, NULL);
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ci->ci_intr_depth--;
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if ((psw & I32_bit) == 0)
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cpsie(I32_bit);
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cpu_dosoftints();
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}
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return oldipl;
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}
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void
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splx(int savedipl)
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{
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struct cpu_info * const ci = curcpu();
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KASSERT(savedipl < NIPL);
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if (__predict_false(savedipl == ci->ci_cpl)) {
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return;
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}
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register_t psw = cpsid(I32_bit);
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KASSERTMSG(panicstr != NULL || savedipl < ci->ci_cpl,
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"splx(%d) to a higher ipl than %d", savedipl, ci->ci_cpl);
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ci->ci_intr_depth++;
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pic_do_pending_ints(psw, savedipl, NULL);
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ci->ci_intr_depth--;
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KASSERTMSG(ci->ci_cpl == savedipl, "cpl %d savedipl %d",
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ci->ci_cpl, savedipl);
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if ((psw & I32_bit) == 0)
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cpsie(I32_bit);
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cpu_dosoftints();
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KASSERTMSG(ci->ci_cpl == savedipl, "cpl %d savedipl %d",
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ci->ci_cpl, savedipl);
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}
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