xen_intr.c revision 1.2.8.2
1 1.2.8.2 yamt /* $NetBSD: xen_intr.c,v 1.2.8.2 2007/12/07 17:27:19 yamt Exp $ */ 2 1.2.8.2 yamt 3 1.2.8.2 yamt /*- 4 1.2.8.2 yamt * Copyright (c) 1998, 2001 The NetBSD Foundation, Inc. 5 1.2.8.2 yamt * All rights reserved. 6 1.2.8.2 yamt * 7 1.2.8.2 yamt * This code is derived from software contributed to The NetBSD Foundation 8 1.2.8.2 yamt * by Charles M. Hannum, and by Jason R. Thorpe. 9 1.2.8.2 yamt * 10 1.2.8.2 yamt * Redistribution and use in source and binary forms, with or without 11 1.2.8.2 yamt * modification, are permitted provided that the following conditions 12 1.2.8.2 yamt * are met: 13 1.2.8.2 yamt * 1. Redistributions of source code must retain the above copyright 14 1.2.8.2 yamt * notice, this list of conditions and the following disclaimer. 15 1.2.8.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 16 1.2.8.2 yamt * notice, this list of conditions and the following disclaimer in the 17 1.2.8.2 yamt * documentation and/or other materials provided with the distribution. 18 1.2.8.2 yamt * 3. All advertising materials mentioning features or use of this software 19 1.2.8.2 yamt * must display the following acknowledgement: 20 1.2.8.2 yamt * This product includes software developed by the NetBSD 21 1.2.8.2 yamt * Foundation, Inc. and its contributors. 22 1.2.8.2 yamt * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.2.8.2 yamt * contributors may be used to endorse or promote products derived 24 1.2.8.2 yamt * from this software without specific prior written permission. 25 1.2.8.2 yamt * 26 1.2.8.2 yamt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.2.8.2 yamt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.2.8.2 yamt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.2.8.2 yamt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.2.8.2 yamt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.2.8.2 yamt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.2.8.2 yamt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.2.8.2 yamt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.2.8.2 yamt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.2.8.2 yamt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.2.8.2 yamt * POSSIBILITY OF SUCH DAMAGE. 37 1.2.8.2 yamt */ 38 1.2.8.2 yamt 39 1.2.8.2 yamt #include <sys/cdefs.h> 40 1.2.8.2 yamt __KERNEL_RCSID(0, "$NetBSD: xen_intr.c,v 1.2.8.2 2007/12/07 17:27:19 yamt Exp $"); 41 1.2.8.2 yamt 42 1.2.8.2 yamt #include <sys/param.h> 43 1.2.8.2 yamt 44 1.2.8.2 yamt #include <machine/cpu.h> 45 1.2.8.2 yamt #include <machine/intr.h> 46 1.2.8.2 yamt 47 1.2.8.2 yamt /* 48 1.2.8.2 yamt * Add a mask to cpl, and return the old value of cpl. 49 1.2.8.2 yamt */ 50 1.2.8.2 yamt int 51 1.2.8.2 yamt splraise(int nlevel) 52 1.2.8.2 yamt { 53 1.2.8.2 yamt int olevel; 54 1.2.8.2 yamt struct cpu_info *ci = curcpu(); 55 1.2.8.2 yamt 56 1.2.8.2 yamt olevel = ci->ci_ilevel; 57 1.2.8.2 yamt if (nlevel > olevel) 58 1.2.8.2 yamt ci->ci_ilevel = nlevel; 59 1.2.8.2 yamt __insn_barrier(); 60 1.2.8.2 yamt return (olevel); 61 1.2.8.2 yamt } 62 1.2.8.2 yamt 63 1.2.8.2 yamt /* 64 1.2.8.2 yamt * Restore a value to cpl (unmasking interrupts). If any unmasked 65 1.2.8.2 yamt * interrupts are pending, call Xspllower() to process them. 66 1.2.8.2 yamt */ 67 1.2.8.2 yamt void 68 1.2.8.2 yamt spllower(int nlevel) 69 1.2.8.2 yamt { 70 1.2.8.2 yamt struct cpu_info *ci = curcpu(); 71 1.2.8.2 yamt u_int32_t imask; 72 1.2.8.2 yamt u_long psl; 73 1.2.8.2 yamt 74 1.2.8.2 yamt __insn_barrier(); 75 1.2.8.2 yamt 76 1.2.8.2 yamt imask = IUNMASK(ci, nlevel); 77 1.2.8.2 yamt psl = x86_read_psl(); 78 1.2.8.2 yamt x86_disable_intr(); 79 1.2.8.2 yamt if (ci->ci_ipending & imask) { 80 1.2.8.2 yamt Xspllower(nlevel); 81 1.2.8.2 yamt /* Xspllower does enable_intr() */ 82 1.2.8.2 yamt } else { 83 1.2.8.2 yamt ci->ci_ilevel = nlevel; 84 1.2.8.2 yamt x86_write_psl(psl); 85 1.2.8.2 yamt } 86 1.2.8.2 yamt } 87 1.2.8.2 yamt 88 1.2.8.2 yamt #ifndef __x86_64__ 89 1.2.8.2 yamt 90 1.2.8.2 yamt /* 91 1.2.8.2 yamt * Software interrupt registration 92 1.2.8.2 yamt * 93 1.2.8.2 yamt * We hand-code this to ensure that it's atomic. 94 1.2.8.2 yamt * 95 1.2.8.2 yamt * XXX always scheduled on the current CPU. 96 1.2.8.2 yamt */ 97 1.2.8.2 yamt void 98 1.2.8.2 yamt softintr(int sir) 99 1.2.8.2 yamt { 100 1.2.8.2 yamt struct cpu_info *ci = curcpu(); 101 1.2.8.2 yamt 102 1.2.8.2 yamt __asm volatile("orl %1, %0" : "=m"(ci->ci_ipending) : "ir" (1 << sir)); 103 1.2.8.2 yamt } 104 1.2.8.2 yamt #endif 105 1.2.8.2 yamt 106 1.2.8.2 yamt void 107 1.2.8.2 yamt x86_disable_intr(void) 108 1.2.8.2 yamt { 109 1.2.8.2 yamt __cli(); 110 1.2.8.2 yamt } 111 1.2.8.2 yamt 112 1.2.8.2 yamt void 113 1.2.8.2 yamt x86_enable_intr(void) 114 1.2.8.2 yamt { 115 1.2.8.2 yamt __sti(); 116 1.2.8.2 yamt } 117 1.2.8.2 yamt 118 1.2.8.2 yamt u_long 119 1.2.8.2 yamt x86_read_psl(void) 120 1.2.8.2 yamt { 121 1.2.8.2 yamt 122 1.2.8.2 yamt return (HYPERVISOR_shared_info->vcpu_info[0].evtchn_upcall_mask); 123 1.2.8.2 yamt } 124 1.2.8.2 yamt 125 1.2.8.2 yamt void 126 1.2.8.2 yamt x86_write_psl(u_long psl) 127 1.2.8.2 yamt { 128 1.2.8.2 yamt 129 1.2.8.2 yamt HYPERVISOR_shared_info->vcpu_info[0].evtchn_upcall_mask = psl; 130 1.2.8.2 yamt x86_lfence(); 131 1.2.8.2 yamt if (HYPERVISOR_shared_info->vcpu_info[0].evtchn_upcall_pending && 132 1.2.8.2 yamt psl == 0) { 133 1.2.8.2 yamt hypervisor_force_callback(); 134 1.2.8.2 yamt } 135 1.2.8.2 yamt } 136
Indexes created Mon Oct 06 21:09:46 GMT 2025