115 lines
2.9 KiB
C
115 lines
2.9 KiB
C
/* $NetBSD: xen_intr.c,v 1.9 2009/01/16 20:16:47 jym Exp $ */
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/*-
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* Copyright (c) 1998, 2001 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 Charles M. Hannum, and by Jason R. Thorpe.
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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: xen_intr.c,v 1.9 2009/01/16 20:16:47 jym Exp $");
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#include <sys/param.h>
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#include <machine/cpu.h>
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#include <machine/intr.h>
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/*
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* Add a mask to cpl, and return the old value of cpl.
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*/
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int
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splraise(int nlevel)
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{
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int olevel;
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struct cpu_info *ci = curcpu();
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olevel = ci->ci_ilevel;
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if (nlevel > olevel)
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ci->ci_ilevel = nlevel;
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__insn_barrier();
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return (olevel);
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}
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/*
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* Restore a value to cpl (unmasking interrupts). If any unmasked
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* interrupts are pending, call Xspllower() to process them.
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*/
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void
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spllower(int nlevel)
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{
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struct cpu_info *ci = curcpu();
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uint32_t imask;
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u_long psl;
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if (ci->ci_ilevel <= nlevel)
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return;
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__insn_barrier();
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imask = IUNMASK(ci, nlevel);
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psl = x86_read_psl();
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x86_disable_intr();
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if (ci->ci_ipending & imask) {
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KASSERT(psl == 0);
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Xspllower(nlevel);
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/* Xspllower does enable_intr() */
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} else {
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ci->ci_ilevel = nlevel;
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x86_write_psl(psl);
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}
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}
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void
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x86_disable_intr(void)
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{
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__cli();
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}
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void
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x86_enable_intr(void)
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{
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__sti();
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}
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u_long
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x86_read_psl(void)
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{
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return (curcpu()->ci_vcpu->evtchn_upcall_mask);
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}
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void
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x86_write_psl(u_long psl)
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{
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struct cpu_info *ci = curcpu();
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ci->ci_vcpu->evtchn_upcall_mask = psl;
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xen_rmb();
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if (ci->ci_vcpu->evtchn_upcall_pending && psl == 0) {
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hypervisor_force_callback();
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}
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}
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