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xen_intr.c revision 1.7 
      1  1.7  bouyer /*	$NetBSD: xen_intr.c,v 1.7 2008/05/25 16:09:30 bouyer 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  1.7  bouyer __KERNEL_RCSID(0, "$NetBSD: xen_intr.c,v 1.7 2008/05/25 16:09:30 bouyer 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  1.3  cegger 	uint32_t imask;
     65  1.2  bouyer 	u_long psl;
     66  1.2  bouyer 
     67  1.2  bouyer 	__insn_barrier();
     68  1.2  bouyer 
     69  1.2  bouyer 	imask = IUNMASK(ci, nlevel);
     70  1.2  bouyer 	psl = x86_read_psl();
     71  1.2  bouyer 	x86_disable_intr();
     72  1.2  bouyer 	if (ci->ci_ipending & imask) {
     73  1.7  bouyer 		KASSERT(psl == 0);
     74  1.2  bouyer 		Xspllower(nlevel);
     75  1.2  bouyer 		/* Xspllower does enable_intr() */
     76  1.2  bouyer 	} else {
     77  1.2  bouyer 		ci->ci_ilevel = nlevel;
     78  1.2  bouyer 		x86_write_psl(psl);
     79  1.2  bouyer 	}
     80  1.2  bouyer }
     81  1.2  bouyer 
     82  1.2  bouyer void
     83  1.2  bouyer x86_disable_intr(void)
     84  1.2  bouyer {
     85  1.2  bouyer 	__cli();
     86  1.2  bouyer }
     87  1.2  bouyer 
     88  1.2  bouyer void
     89  1.2  bouyer x86_enable_intr(void)
     90  1.2  bouyer {
     91  1.2  bouyer 	__sti();
     92  1.2  bouyer }
     93  1.2  bouyer 
     94  1.2  bouyer u_long
     95  1.2  bouyer x86_read_psl(void)
     96  1.2  bouyer {
     97  1.2  bouyer 
     98  1.4  cegger 	return (curcpu()->ci_vcpu->evtchn_upcall_mask);
     99  1.2  bouyer }
    100  1.2  bouyer 
    101  1.2  bouyer void
    102  1.2  bouyer x86_write_psl(u_long psl)
    103  1.2  bouyer {
    104  1.4  cegger 	struct cpu_info *ci = curcpu();
    105  1.2  bouyer 
    106  1.4  cegger 	ci->ci_vcpu->evtchn_upcall_mask = psl;
    107  1.2  bouyer 	x86_lfence();
    108  1.4  cegger 	if (ci->ci_vcpu->evtchn_upcall_pending && psl == 0) {
    109  1.2  bouyer 	    	hypervisor_force_callback();
    110  1.2  bouyer 	}
    111  1.2  bouyer }
    112