1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_IO_APIC_H
3#define _ASM_X86_IO_APIC_H
4
5#include <linux/types.h>
6#include <asm/mpspec.h>
7#include <asm/apicdef.h>
8#include <asm/irq_vectors.h>
9#include <asm/x86_init.h>
10/*
11 * Intel IO-APIC support for SMP and UP systems.
12 *
13 * Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar
14 */
15
16/*
17 * The structure of the IO-APIC:
18 */
19union IO_APIC_reg_00 {
20 u32 raw;
21 struct {
22 u32 __reserved_2 : 14,
23 LTS : 1,
24 delivery_type : 1,
25 __reserved_1 : 8,
26 ID : 8;
27 } __attribute__ ((packed)) bits;
28};
29
30union IO_APIC_reg_01 {
31 u32 raw;
32 struct {
33 u32 version : 8,
34 __reserved_2 : 7,
35 PRQ : 1,
36 entries : 8,
37 __reserved_1 : 8;
38 } __attribute__ ((packed)) bits;
39};
40
41union IO_APIC_reg_02 {
42 u32 raw;
43 struct {
44 u32 __reserved_2 : 24,
45 arbitration : 4,
46 __reserved_1 : 4;
47 } __attribute__ ((packed)) bits;
48};
49
50union IO_APIC_reg_03 {
51 u32 raw;
52 struct {
53 u32 boot_DT : 1,
54 __reserved_1 : 31;
55 } __attribute__ ((packed)) bits;
56};
57
58struct IO_APIC_route_entry {
59 union {
60 struct {
61 u64 vector : 8,
62 delivery_mode : 3,
63 dest_mode_logical : 1,
64 delivery_status : 1,
65 active_low : 1,
66 irr : 1,
67 is_level : 1,
68 masked : 1,
69 reserved_0 : 15,
70 reserved_1 : 17,
71 virt_destid_8_14 : 7,
72 destid_0_7 : 8;
73 };
74 struct {
75 u64 ir_shared_0 : 8,
76 ir_zero : 3,
77 ir_index_15 : 1,
78 ir_shared_1 : 5,
79 ir_reserved_0 : 31,
80 ir_format : 1,
81 ir_index_0_14 : 15;
82 };
83 struct {
84 u64 w1 : 32,
85 w2 : 32;
86 };
87 };
88} __attribute__ ((packed));
89
90struct irq_alloc_info;
91struct ioapic_domain_cfg;
92
93#define IOAPIC_MAP_ALLOC 0x1
94#define IOAPIC_MAP_CHECK 0x2
95
96#ifdef CONFIG_X86_IO_APIC
97
98/*
99 * # of IO-APICs and # of IRQ routing registers
100 */
101extern int nr_ioapics;
102
103extern int mpc_ioapic_id(int ioapic);
104extern unsigned int mpc_ioapic_addr(int ioapic);
105
106/* # of MP IRQ source entries */
107extern int mp_irq_entries;
108
109/* MP IRQ source entries */
110extern struct mpc_intsrc mp_irqs[MAX_IRQ_SOURCES];
111
112/* True if "noapic" boot option passed */
113extern bool ioapic_is_disabled;
114
115/* 1 if "noapic" boot option passed */
116extern int noioapicquirk;
117
118/* -1 if "noapic" boot option passed */
119extern int noioapicreroute;
120
121extern u32 gsi_top;
122
123extern unsigned long io_apic_irqs;
124
125#define IO_APIC_IRQ(x) (((x) >= NR_IRQS_LEGACY) || ((1 << (x)) & io_apic_irqs))
126
127/*
128 * If we use the IO-APIC for IRQ routing, disable automatic
129 * assignment of PCI IRQ's.
130 */
131#define io_apic_assign_pci_irqs \
132 (mp_irq_entries && !ioapic_is_disabled && io_apic_irqs)
133
134struct irq_cfg;
135extern void ioapic_insert_resources(void);
136extern int arch_early_ioapic_init(void);
137
138extern int save_ioapic_entries(void);
139extern void mask_ioapic_entries(void);
140extern int restore_ioapic_entries(void);
141
142extern void setup_ioapic_ids_from_mpc(void);
143
144extern int mp_find_ioapic(u32 gsi);
145extern int mp_find_ioapic_pin(int ioapic, u32 gsi);
146extern int mp_map_gsi_to_irq(u32 gsi, unsigned int flags,
147 struct irq_alloc_info *info);
148extern void mp_unmap_irq(int irq);
149extern int mp_register_ioapic(int id, u32 address, u32 gsi_base,
150 struct ioapic_domain_cfg *cfg);
151extern int mp_unregister_ioapic(u32 gsi_base);
152extern int mp_ioapic_registered(u32 gsi_base);
153
154extern void ioapic_set_alloc_attr(struct irq_alloc_info *info,
155 int node, int trigger, int polarity);
156
157extern void mp_save_irq(struct mpc_intsrc *m);
158
159extern void disable_ioapic_support(void);
160
161extern void __init io_apic_init_mappings(void);
162extern unsigned int native_io_apic_read(unsigned int apic, unsigned int reg);
163extern void native_restore_boot_irq_mode(void);
164
165static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
166{
167 return x86_apic_ops.io_apic_read(apic, reg);
168}
169
170extern void setup_IO_APIC(void);
171extern void enable_IO_APIC(void);
172extern void clear_IO_APIC(void);
173extern void restore_boot_irq_mode(void);
174extern int IO_APIC_get_PCI_irq_vector(int bus, int devfn, int pin);
175extern void print_IO_APICs(void);
176#else /* !CONFIG_X86_IO_APIC */
177
178#define IO_APIC_IRQ(x) 0
179#define io_apic_assign_pci_irqs 0
180#define setup_ioapic_ids_from_mpc x86_init_noop
181#define nr_ioapics (0)
182static inline void ioapic_insert_resources(void) { }
183static inline int arch_early_ioapic_init(void) { return 0; }
184static inline void print_IO_APICs(void) {}
185#define gsi_top (NR_IRQS_LEGACY)
186static inline int mp_find_ioapic(u32 gsi) { return 0; }
187static inline int mp_map_gsi_to_irq(u32 gsi, unsigned int flags,
188 struct irq_alloc_info *info)
189{
190 return gsi;
191}
192
193static inline void mp_unmap_irq(int irq) { }
194
195static inline int save_ioapic_entries(void)
196{
197 return -ENOMEM;
198}
199
200static inline void mask_ioapic_entries(void) { }
201static inline int restore_ioapic_entries(void)
202{
203 return -ENOMEM;
204}
205
206static inline void mp_save_irq(struct mpc_intsrc *m) { }
207static inline void disable_ioapic_support(void) { }
208static inline void io_apic_init_mappings(void) { }
209#define native_io_apic_read NULL
210#define native_restore_boot_irq_mode NULL
211
212static inline void setup_IO_APIC(void) { }
213static inline void enable_IO_APIC(void) { }
214static inline void restore_boot_irq_mode(void) { }
215
216#endif
217
218#endif /* _ASM_X86_IO_APIC_H */
219

source code of linux/arch/x86/include/asm/io_apic.h