1 #ifndef __ASM_IO_APIC_H
2 #define __ASM_IO_APIC_H
3
4 #include <linux/config.h>
5 #include <asm/types.h>
6
7 /*
8 * Intel IO-APIC support for SMP and UP systems.
9 *
10 * Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar
11 */
12
13 #ifdef CONFIG_X86_IO_APIC
14
15 #define APIC_MISMATCH_DEBUG
16
17 #define IO_APIC_BASE(idx) \
18 ((volatile int *)(__fix_to_virt(FIX_IO_APIC_BASE_0 + idx) \
19 + (mp_ioapics[idx].mpc_apicaddr & ~PAGE_MASK)))
20
21 /*
22 * The structure of the IO-APIC:
23 */
24 struct IO_APIC_reg_00 {
25 __u32 __reserved_2 : 24,
26 ID : 4,
27 __reserved_1 : 4;
28 } __attribute__ ((packed));
29
30 struct IO_APIC_reg_01 {
31 __u32 version : 8,
32 __reserved_2 : 7,
33 PRQ : 1,
34 entries : 8,
35 __reserved_1 : 8;
36 } __attribute__ ((packed));
37
38 struct IO_APIC_reg_02 {
39 __u32 __reserved_2 : 24,
40 arbitration : 4,
41 __reserved_1 : 4;
42 } __attribute__ ((packed));
43
44 /*
45 * # of IO-APICs and # of IRQ routing registers
46 */
47 extern int nr_ioapics;
48 extern int nr_ioapic_registers[MAX_IO_APICS];
49
50 enum ioapic_irq_destination_types {
51 dest_Fixed = 0,
52 dest_LowestPrio = 1,
53 dest_SMI = 2,
54 dest__reserved_1 = 3,
55 dest_NMI = 4,
56 dest_INIT = 5,
57 dest__reserved_2 = 6,
58 dest_ExtINT = 7
59 };
60
61 struct IO_APIC_route_entry {
62 __u32 vector : 8,
63 delivery_mode : 3, /* 000: FIXED
64 * 001: lowest prio
65 * 111: ExtINT
66 */
67 dest_mode : 1, /* 0: physical, 1: logical */
68 delivery_status : 1,
69 polarity : 1,
70 irr : 1,
71 trigger : 1, /* 0: edge, 1: level */
72 mask : 1, /* 0: enabled, 1: disabled */
73 __reserved_2 : 15;
74
75 union { struct { __u32
76 __reserved_1 : 24,
77 physical_dest : 4,
78 __reserved_2 : 4;
79 } physical;
80
81 struct { __u32
82 __reserved_1 : 24,
83 logical_dest : 8;
84 } logical;
85 } dest;
86
87 } __attribute__ ((packed));
88
89 /*
90 * MP-BIOS irq configuration table structures:
91 */
92
93 /* I/O APIC entries */
94 extern struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];
95
96 /* # of MP IRQ source entries */
97 extern int mp_irq_entries;
98
99 /* MP IRQ source entries */
100 extern struct mpc_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
101
102 /* non-0 if default (table-less) MP configuration */
103 extern int mpc_default_type;
104
io_apic_read(unsigned int apic,unsigned int reg)105 static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
106 {
107 *IO_APIC_BASE(apic) = reg;
108 return *(IO_APIC_BASE(apic)+4);
109 }
110
io_apic_write(unsigned int apic,unsigned int reg,unsigned int value)111 static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
112 {
113 *IO_APIC_BASE(apic) = reg;
114 *(IO_APIC_BASE(apic)+4) = value;
115 }
116
117 /*
118 * Re-write a value: to be used for read-modify-write
119 * cycles where the read already set up the index register.
120 */
io_apic_modify(unsigned int apic,unsigned int value)121 static inline void io_apic_modify(unsigned int apic, unsigned int value)
122 {
123 *(IO_APIC_BASE(apic)+4) = value;
124 }
125
126 /*
127 * Synchronize the IO-APIC and the CPU by doing
128 * a dummy read from the IO-APIC
129 */
io_apic_sync(unsigned int apic)130 static inline void io_apic_sync(unsigned int apic)
131 {
132 (void) *(IO_APIC_BASE(apic)+4);
133 }
134
135 /* 1 if "noapic" boot option passed */
136 extern int skip_ioapic_setup;
137
138 /*
139 * If we use the IO-APIC for IRQ routing, disable automatic
140 * assignment of PCI IRQ's.
141 */
142 #define io_apic_assign_pci_irqs (mp_irq_entries && !skip_ioapic_setup)
143
144 extern int skip_ioapic_setup; /* 1 for "noapic" */
145
disable_ioapic_setup(void)146 static inline void disable_ioapic_setup(void)
147 {
148 skip_ioapic_setup = 1;
149 }
150
ioapic_setup_disabled(void)151 static inline int ioapic_setup_disabled(void)
152 {
153 return skip_ioapic_setup;
154 }
155
156 #else /* !CONFIG_X86_IO_APIC */
157
158 #define io_apic_assign_pci_irqs 0
159
disable_ioapic_setup(void)160 static inline void disable_ioapic_setup(void)
161 { }
162
163 #endif /* !CONFIG_X86_IO_APIC */
164
165 extern int io_apic_get_unique_id (int ioapic, int apic_id);
166 extern int io_apic_get_version (int ioapic);
167 extern int io_apic_get_redir_entries (int ioapic);
168 extern int io_apic_set_pci_routing (int ioapic, int pin, int irq, int, int);
169
170 #endif
171