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xen_intr.c revision 1.2.22.2 
      1       1.2  bouyer /*	$NetBSD: xen_intr.c,v 1.2.22.2 2008/07/02 19:08:19 mjf Exp $	*/
      2       1.2  bouyer 
      3       1.2  bouyer /*-
      4       1.2  bouyer  * Copyright (c) 1998, 2001 The NetBSD Foundation, Inc.
      5       1.2  bouyer  * All rights reserved.
      6       1.2  bouyer  *
      7       1.2  bouyer  * This code is derived from software contributed to The NetBSD Foundation
      8       1.2  bouyer  * by Charles M. Hannum, and by Jason R. Thorpe.
      9       1.2  bouyer  *
     10       1.2  bouyer  * Redistribution and use in source and binary forms, with or without
     11       1.2  bouyer  * modification, are permitted provided that the following conditions
     12       1.2  bouyer  * are met:
     13       1.2  bouyer  * 1. Redistributions of source code must retain the above copyright
     14       1.2  bouyer  *    notice, this list of conditions and the following disclaimer.
     15       1.2  bouyer  * 2. Redistributions in binary form must reproduce the above copyright
     16       1.2  bouyer  *    notice, this list of conditions and the following disclaimer in the
     17       1.2  bouyer  *    documentation and/or other materials provided with the distribution.
     18       1.2  bouyer  *
     19       1.2  bouyer  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20       1.2  bouyer  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21       1.2  bouyer  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22       1.2  bouyer  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23       1.2  bouyer  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24       1.2  bouyer  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25       1.2  bouyer  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26       1.2  bouyer  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27       1.2  bouyer  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28       1.2  bouyer  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29       1.2  bouyer  * POSSIBILITY OF SUCH DAMAGE.
     30       1.2  bouyer  */
     31       1.2  bouyer 
     32       1.2  bouyer #include <sys/cdefs.h>
     33       1.2  bouyer __KERNEL_RCSID(0, "$NetBSD: xen_intr.c,v 1.2.22.2 2008/07/02 19:08:19 mjf Exp $");
     34       1.2  bouyer 
     35       1.2  bouyer #include <sys/param.h>
     36       1.2  bouyer 
     37       1.2  bouyer #include <machine/cpu.h>
     38       1.2  bouyer #include <machine/intr.h>
     39       1.2  bouyer 
     40       1.2  bouyer /*
     41       1.2  bouyer  * Add a mask to cpl, and return the old value of cpl.
     42       1.2  bouyer  */
     43       1.2  bouyer int
     44       1.2  bouyer splraise(int nlevel)
     45       1.2  bouyer {
     46       1.2  bouyer 	int olevel;
     47       1.2  bouyer 	struct cpu_info *ci = curcpu();
     48       1.2  bouyer 
     49       1.2  bouyer 	olevel = ci->ci_ilevel;
     50       1.2  bouyer 	if (nlevel > olevel)
     51       1.2  bouyer 		ci->ci_ilevel = nlevel;
     52       1.2  bouyer 	__insn_barrier();
     53       1.2  bouyer 	return (olevel);
     54       1.2  bouyer }
     55       1.2  bouyer 
     56       1.2  bouyer /*
     57       1.2  bouyer  * Restore a value to cpl (unmasking interrupts).  If any unmasked
     58       1.2  bouyer  * interrupts are pending, call Xspllower() to process them.
     59       1.2  bouyer  */
     60       1.2  bouyer void
     61       1.2  bouyer spllower(int nlevel)
     62       1.2  bouyer {
     63       1.2  bouyer 	struct cpu_info *ci = curcpu();
     64  1.2.22.1     mjf 	uint32_t imask;
     65       1.2  bouyer 	u_long psl;
     66       1.2  bouyer 
     67  1.2.22.2     mjf 	if (ci->ci_ilevel <= nlevel)
     68  1.2.22.2     mjf 		return;
     69  1.2.22.2     mjf 
     70       1.2  bouyer 	__insn_barrier();
     71       1.2  bouyer 
     72       1.2  bouyer 	imask = IUNMASK(ci, nlevel);
     73       1.2  bouyer 	psl = x86_read_psl();
     74       1.2  bouyer 	x86_disable_intr();
     75       1.2  bouyer 	if (ci->ci_ipending & imask) {
     76  1.2.22.1     mjf 		KASSERT(psl == 0);
     77       1.2  bouyer 		Xspllower(nlevel);
     78       1.2  bouyer 		/* Xspllower does enable_intr() */
     79       1.2  bouyer 	} else {
     80       1.2  bouyer 		ci->ci_ilevel = nlevel;
     81       1.2  bouyer 		x86_write_psl(psl);
     82       1.2  bouyer 	}
     83       1.2  bouyer }
     84       1.2  bouyer 
     85       1.2  bouyer void
     86       1.2  bouyer x86_disable_intr(void)
     87       1.2  bouyer {
     88       1.2  bouyer 	__cli();
     89       1.2  bouyer }
     90       1.2  bouyer 
     91       1.2  bouyer void
     92       1.2  bouyer x86_enable_intr(void)
     93       1.2  bouyer {
     94       1.2  bouyer 	__sti();
     95       1.2  bouyer }
     96       1.2  bouyer 
     97       1.2  bouyer u_long
     98       1.2  bouyer x86_read_psl(void)
     99       1.2  bouyer {
    100       1.2  bouyer 
    101  1.2.22.1     mjf 	return (curcpu()->ci_vcpu->evtchn_upcall_mask);
    102       1.2  bouyer }
    103       1.2  bouyer 
    104       1.2  bouyer void
    105       1.2  bouyer x86_write_psl(u_long psl)
    106       1.2  bouyer {
    107  1.2.22.1     mjf 	struct cpu_info *ci = curcpu();
    108       1.2  bouyer 
    109  1.2.22.1     mjf 	ci->ci_vcpu->evtchn_upcall_mask = psl;
    110       1.2  bouyer 	x86_lfence();
    111  1.2.22.1     mjf 	if (ci->ci_vcpu->evtchn_upcall_pending && psl == 0) {
    112       1.2  bouyer 	    	hypervisor_force_callback();
    113       1.2  bouyer 	}
    114       1.2  bouyer }
    115