1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2003 John Baldwin <jhb@FreeBSD.org> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #ifndef __X86_INTR_MACHDEP_H__ 29 #define __X86_INTR_MACHDEP_H__ 30 31 #ifdef _KERNEL 32 33 /* 34 * Values used in determining the allocation of IRQ values among 35 * different types of I/O interrupts. These values are used as 36 * indices into a interrupt source array to map I/O interrupts to a 37 * device interrupt source whether it be a pin on an interrupt 38 * controller or an MSI interrupt. The 16 ISA IRQs are assigned fixed 39 * IDT vectors, but all other device interrupts allocate IDT vectors 40 * on demand. Currently we have 191 IDT vectors available for device 41 * interrupts on each CPU. On many systems with I/O APICs, a lot of 42 * the IRQs are not used, so the total number of IRQ values reserved 43 * can exceed the number of available IDT slots. 44 * 45 * The first 16 IRQs (0 - 15) are reserved for ISA IRQs. Interrupt 46 * pins on I/O APICs for non-ISA interrupts use IRQ values starting at 47 * IRQ 17. This layout matches the GSI numbering used by ACPI so that 48 * IRQ values returned by ACPI methods such as _CRS can be used 49 * directly by the ACPI bus driver. 50 * 51 * MSI interrupts allocate a block of interrupts starting at the end 52 * of the I/O APIC range. When running under the Xen Hypervisor, an 53 * additional range of IRQ values are available for binding to event 54 * channel events. 55 */ 56 extern u_int first_msi_irq; 57 extern u_int num_io_irqs; 58 extern u_int num_msi_irqs; 59 60 /* 61 * Default base address for MSI messages on x86 platforms. 62 */ 63 #define MSI_INTEL_ADDR_BASE 0xfee00000 64 65 #ifndef LOCORE 66 67 typedef void inthand_t(void); 68 69 #define IDTVEC(name) __CONCAT(X,name) 70 71 struct intsrc; 72 73 /* 74 * Methods that a PIC provides to mask/unmask a given interrupt source, 75 * "turn on" the interrupt on the CPU side by setting up an IDT entry, and 76 * return the vector associated with this source. 77 */ 78 struct pic { 79 void (*pic_register_sources)(struct pic *); 80 void (*pic_enable_source)(struct intsrc *); 81 void (*pic_disable_source)(struct intsrc *, int); 82 void (*pic_eoi_source)(struct intsrc *); 83 void (*pic_enable_intr)(struct intsrc *); 84 void (*pic_disable_intr)(struct intsrc *); 85 int (*pic_vector)(struct intsrc *); 86 int (*pic_source_pending)(struct intsrc *); 87 void (*pic_suspend)(struct pic *); 88 void (*pic_resume)(struct pic *, bool suspend_cancelled); 89 int (*pic_config_intr)(struct intsrc *, enum intr_trigger, 90 enum intr_polarity); 91 int (*pic_assign_cpu)(struct intsrc *, u_int apic_id); 92 void (*pic_reprogram_pin)(struct intsrc *); 93 TAILQ_ENTRY(pic) pics; 94 }; 95 96 /* Flags for pic_disable_source() */ 97 enum { 98 PIC_EOI, 99 PIC_NO_EOI, 100 }; 101 102 /* 103 * An interrupt source. The upper-layer code uses the PIC methods to 104 * control a given source. The lower-layer PIC drivers can store additional 105 * private data in a given interrupt source such as an interrupt pin number 106 * or an I/O APIC pointer. 107 */ 108 struct intsrc { 109 struct pic *is_pic; 110 struct intr_event *is_event; 111 u_long *is_count; 112 u_long *is_straycount; 113 u_int is_index; 114 u_int is_handlers; 115 u_int is_domain; 116 u_int is_cpu; 117 }; 118 119 struct trapframe; 120 121 #ifdef SMP 122 extern cpuset_t intr_cpus; 123 #endif 124 extern struct mtx icu_lock; 125 extern int elcr_found; 126 #ifdef SMP 127 extern int msix_disable_migration; 128 #endif 129 130 #ifndef DEV_ATPIC 131 void atpic_reset(void); 132 #endif 133 /* XXX: The elcr_* prototypes probably belong somewhere else. */ 134 int elcr_probe(void); 135 enum intr_trigger elcr_read_trigger(u_int irq); 136 void elcr_resume(void); 137 void elcr_write_trigger(u_int irq, enum intr_trigger trigger); 138 #ifdef SMP 139 void intr_add_cpu(u_int cpu); 140 #endif 141 int intr_add_handler(struct intsrc *isrc, const char *name, 142 driver_filter_t filter, driver_intr_t handler, void *arg, 143 enum intr_type flags, void **cookiep, int domain); 144 int intr_config_intr(struct intsrc *isrc, enum intr_trigger trig, 145 enum intr_polarity pol); 146 int intr_describe(struct intsrc *isrc, void *ih, const char *descr); 147 void intr_execute_handlers(struct intsrc *isrc, struct trapframe *frame); 148 u_int intr_next_cpu(int domain); 149 struct intsrc *intr_lookup_source(int vector); 150 int intr_register_pic(struct pic *pic); 151 int intr_register_source(struct intsrc *isrc); 152 int intr_remove_handler(void *cookie); 153 void intr_resume(bool suspend_cancelled); 154 void intr_suspend(void); 155 void intr_reprogram(void); 156 void intrcnt_add(const char *name, u_long **countp); 157 void nexus_add_irq(u_long irq); 158 int msi_alloc(device_t dev, int count, int maxcount, int *irqs); 159 void msi_init(void); 160 int msi_map(int irq, uint64_t *addr, uint32_t *data); 161 int msi_release(int *irqs, int count); 162 int msix_alloc(device_t dev, int *irq); 163 int msix_release(int irq); 164 #ifdef XENHVM 165 void xen_intr_alloc_irqs(void); 166 #endif 167 168 #endif /* !LOCORE */ 169 #endif /* _KERNEL */ 170 #endif /* !__X86_INTR_MACHDEP_H__ */ 171