xen_intr.c revision 1.3.2.1
1 1.3.2.1 yamt /* $NetBSD: xen_intr.c,v 1.3.2.1 2008/05/18 12:33:08 yamt 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 1.3.2.1 yamt __KERNEL_RCSID(0, "$NetBSD: xen_intr.c,v 1.3.2.1 2008/05/18 12:33:08 yamt 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 1.2 bouyer Xspllower(nlevel); 74 1.2 bouyer /* Xspllower does enable_intr() */ 75 1.2 bouyer } else { 76 1.2 bouyer ci->ci_ilevel = nlevel; 77 1.2 bouyer x86_write_psl(psl); 78 1.2 bouyer } 79 1.2 bouyer } 80 1.2 bouyer 81 1.2 bouyer #ifndef __x86_64__ 82 1.2 bouyer 83 1.2 bouyer /* 84 1.2 bouyer * Software interrupt registration 85 1.2 bouyer * 86 1.2 bouyer * We hand-code this to ensure that it's atomic. 87 1.2 bouyer * 88 1.2 bouyer * XXX always scheduled on the current CPU. 89 1.2 bouyer */ 90 1.2 bouyer void 91 1.2 bouyer softintr(int sir) 92 1.2 bouyer { 93 1.2 bouyer struct cpu_info *ci = curcpu(); 94 1.2 bouyer 95 1.2 bouyer __asm volatile("orl %1, %0" : "=m"(ci->ci_ipending) : "ir" (1 << sir)); 96 1.2 bouyer } 97 1.2 bouyer #endif 98 1.2 bouyer 99 1.2 bouyer void 100 1.2 bouyer x86_disable_intr(void) 101 1.2 bouyer { 102 1.2 bouyer __cli(); 103 1.2 bouyer } 104 1.2 bouyer 105 1.2 bouyer void 106 1.2 bouyer x86_enable_intr(void) 107 1.2 bouyer { 108 1.2 bouyer __sti(); 109 1.2 bouyer } 110 1.2 bouyer 111 1.2 bouyer u_long 112 1.2 bouyer x86_read_psl(void) 113 1.2 bouyer { 114 1.2 bouyer 115 1.3.2.1 yamt return (curcpu()->ci_vcpu->evtchn_upcall_mask); 116 1.2 bouyer } 117 1.2 bouyer 118 1.2 bouyer void 119 1.2 bouyer x86_write_psl(u_long psl) 120 1.2 bouyer { 121 1.3.2.1 yamt struct cpu_info *ci = curcpu(); 122 1.2 bouyer 123 1.3.2.1 yamt ci->ci_vcpu->evtchn_upcall_mask = psl; 124 1.2 bouyer x86_lfence(); 125 1.3.2.1 yamt if (ci->ci_vcpu->evtchn_upcall_pending && psl == 0) { 126 1.2 bouyer hypervisor_force_callback(); 127 1.2 bouyer } 128 1.2 bouyer } 129
Indexes created Mon Oct 06 21:09:46 GMT 2025