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xen_intr.c revision 1.7.2.1 
      1  1.7.2.1  simonb /*	$NetBSD: xen_intr.c,v 1.7.2.1 2008/07/03 18:37:57 simonb 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  1.7.2.1  simonb __KERNEL_RCSID(0, "$NetBSD: xen_intr.c,v 1.7.2.1 2008/07/03 18:37:57 simonb 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  1.7.2.1  simonb 	if (ci->ci_ilevel <= nlevel)
     68  1.7.2.1  simonb 		return;
     69  1.7.2.1  simonb 
     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      1.7  bouyer 		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      1.4  cegger 	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      1.4  cegger 	struct cpu_info *ci = curcpu();
    108      1.2  bouyer 
    109      1.4  cegger 	ci->ci_vcpu->evtchn_upcall_mask = psl;
    110      1.2  bouyer 	x86_lfence();
    111      1.4  cegger 	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