1 /* $NetBSD: intr.h,v 1.66 2022/09/07 00:40:18 knakahara Exp $ */ 2 3 /*- 4 * Copyright (c) 1998, 2001, 2006, 2007, 2008, 2019 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Charles M. Hannum, and by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _X86_INTR_H_ 33 #define _X86_INTR_H_ 34 35 #define __HAVE_FAST_SOFTINTS 36 #if !defined(NO_PREEMPTION) 37 #define __HAVE_PREEMPTION 38 #endif /* !defined(NO_PREEMPTION) */ 39 40 #ifdef _KERNEL 41 #include <sys/types.h> 42 #include <sys/kcpuset.h> 43 #else 44 #include <stdbool.h> 45 #endif 46 47 #include <sys/evcnt.h> 48 #include <sys/queue.h> 49 #include <machine/intrdefs.h> 50 51 #ifdef XEN 52 #include <xen/include/public/xen.h> 53 #include <xen/include/public/event_channel.h> 54 #endif /* XEN */ 55 56 #ifndef _LOCORE 57 #include <machine/pic.h> 58 59 /* 60 * Struct describing an interrupt source for a CPU. struct cpu_info 61 * has an array of MAX_INTR_SOURCES of these. The index in the array 62 * is equal to the stub number of the stubcode as present in vector.s 63 * 64 * The primary CPU's array of interrupt sources has its first 16 65 * entries reserved for legacy ISA irq handlers. This means that 66 * they have a 1:1 mapping for arrayindex:irq_num. This is not 67 * true for interrupts that come in through IO APICs, to find 68 * their source, go through ci->ci_isources[index].is_pic 69 * 70 * It's possible to always maintain a 1:1 mapping, but that means 71 * limiting the total number of interrupt sources to MAX_INTR_SOURCES 72 * (32), instead of 32 per CPU. It also would mean that having multiple 73 * IO APICs which deliver interrupts from an equal pin number would 74 * overlap if they were to be sent to the same CPU. 75 */ 76 77 struct intrstub { 78 void *ist_entry; 79 void *ist_recurse; 80 void *ist_resume; 81 }; 82 83 struct percpu_evcnt { 84 cpuid_t cpuid; 85 uint64_t count; 86 }; 87 88 struct intrsource { 89 int is_maxlevel; /* max. IPL for this source */ 90 int is_pin; /* IRQ for legacy; pin for IO APIC, 91 -1 for MSI */ 92 struct intrhand *is_handlers; /* handler chain */ 93 struct pic *is_pic; /* originating PIC */ 94 void *is_recurse; /* entry for spllower */ 95 void *is_resume; /* entry for doreti */ 96 lwp_t *is_lwp; /* for soft interrupts */ 97 #if defined(XEN) 98 u_long ipl_evt_mask1; /* pending events for this IPL */ 99 u_long ipl_evt_mask2[NR_EVENT_CHANNELS]; 100 #endif 101 struct evcnt is_evcnt; /* interrupt counter per cpu */ 102 /* 103 * is_mask_count requires special handling; it can only be modified 104 * or examined on the CPU that owns the interrupt source, and such 105 * references need to be protected by disabling interrupts. This 106 * is because intr_mask() can be called from an interrupt handler. 107 * is_distribute_pending does not require such special handling 108 * because intr_unmask() cannot be called from an interrupt handler. 109 */ 110 u_int is_mask_count; /* masked? (nested) [see above] */ 111 int is_distribute_pending; /* ci<->ci move pending [cpu_lock] */ 112 int is_flags; /* see below */ 113 int is_type; /* level, edge */ 114 int is_idtvec; 115 int is_minlevel; 116 char is_evname[32]; /* event counter name */ 117 char is_intrid[INTRIDBUF]; /* intrid created by create_intrid() */ 118 char is_xname[INTRDEVNAMEBUF]; /* device names */ 119 cpuid_t is_active_cpu; /* active cpuid */ 120 struct percpu_evcnt *is_saved_evcnt; /* interrupt count of deactivated cpus */ 121 SIMPLEQ_ENTRY(intrsource) is_list; /* link of intrsources */ 122 }; 123 124 #define IS_LEGACY 0x0001 /* legacy ISA irq source */ 125 #define IS_IPI 0x0002 126 #define IS_LOG 0x0004 127 128 /* 129 * Interrupt handler chains. *_intr_establish() insert a handler into 130 * the list. The handler is called with its (single) argument. 131 */ 132 133 struct intrhand { 134 struct pic *ih_pic; 135 int (*ih_fun)(void *); 136 void *ih_arg; 137 int ih_level; 138 int (*ih_realfun)(void *); 139 void *ih_realarg; 140 struct intrhand *ih_next; 141 struct intrhand **ih_prevp; 142 int ih_pin; 143 int ih_slot; 144 #if defined(XEN) 145 int ih_pending; 146 struct intrhand *ih_evt_next; 147 #endif 148 struct cpu_info *ih_cpu; 149 char ih_xname[INTRDEVNAMEBUF]; 150 }; 151 152 #ifdef _KERNEL 153 154 void Xspllower(int); 155 void spllower(int); 156 int splraise(int); 157 void softintr(int); 158 159 /* 160 * Convert spl level to local APIC level 161 */ 162 163 #define APIC_LEVEL(l) ((l) << 4) 164 165 /* 166 * Miscellaneous 167 */ 168 169 #define SPL_ASSERT_BELOW(x) KDASSERT(curcpu()->ci_ilevel < (x)) 170 #define spl0() spllower(IPL_NONE) 171 #define splx(x) spllower(x) 172 173 typedef uint8_t ipl_t; 174 typedef struct { 175 ipl_t _ipl; 176 } ipl_cookie_t; 177 178 static inline ipl_cookie_t 179 makeiplcookie(ipl_t ipl) 180 { 181 182 return (ipl_cookie_t){._ipl = ipl}; 183 } 184 185 static inline int 186 splraiseipl(ipl_cookie_t icookie) 187 { 188 189 return splraise(icookie._ipl); 190 } 191 192 #include <sys/spl.h> 193 194 /* 195 * Stub declarations. 196 */ 197 198 void Xsoftintr(void); 199 void Xrecurse_preempt(void); 200 void Xresume_preempt(void); 201 202 extern struct intrstub legacy_stubs[]; 203 extern struct intrstub ioapic_edge_stubs[]; 204 extern struct intrstub ioapic_level_stubs[]; 205 extern struct intrstub x2apic_edge_stubs[]; 206 extern struct intrstub x2apic_level_stubs[]; 207 208 struct cpu_info; 209 210 struct pcibus_attach_args; 211 212 typedef uint64_t intr_handle_t; 213 214 void intr_default_setup(void); 215 void x86_nmi(void); 216 void *intr_establish_xname(int, struct pic *, int, int, int, int (*)(void *), 217 void *, bool, const char *); 218 void *intr_establish(int, struct pic *, int, int, int, int (*)(void *), void *, bool); 219 void intr_mask(struct intrhand *); 220 void intr_unmask(struct intrhand *); 221 void intr_disestablish(struct intrhand *); 222 void intr_add_pcibus(struct pcibus_attach_args *); 223 const char *intr_string(intr_handle_t, char *, size_t); 224 void cpu_intr_init(struct cpu_info *); 225 int intr_find_mpmapping(int, int, intr_handle_t *); 226 struct pic *intr_findpic(int); 227 void intr_printconfig(void); 228 229 const char *intr_create_intrid(int, struct pic *, int, char *, size_t); 230 struct intrsource *intr_allocate_io_intrsource(const char *); 231 void intr_free_io_intrsource(const char *); 232 233 void x86_init_preempt(struct cpu_info *); 234 void x86_intr_calculatemasks(struct cpu_info *); 235 236 int x86_send_ipi(struct cpu_info *, int); 237 void x86_broadcast_ipi(int); 238 void x86_ipi_handler(void); 239 240 void x86_intr_get_devname(const char *, char *, size_t); 241 void x86_intr_get_assigned(const char *, kcpuset_t *); 242 uint64_t x86_intr_get_count(const char *, u_int); 243 244 #ifndef XENPV 245 extern void (* const ipifunc[X86_NIPI])(struct cpu_info *); 246 #endif 247 248 #endif /* _KERNEL */ 249 250 #endif /* !_LOCORE */ 251 252 #endif /* !_X86_INTR_H_ */ 253
Indexes created Sun Sep 21 19:09:51 GMT 2025