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 : 14,
26 LTS : 1,
27 delivery_type : 1,
28 __reserved_1 : 8,
29 ID : 4,
30 __reserved_0 : 4;
31 } __attribute__ ((packed));
32
33 struct IO_APIC_reg_01 {
34 __u32 version : 8,
35 __reserved_2 : 7,
36 PRQ : 1,
37 entries : 8,
38 __reserved_1 : 8;
39 } __attribute__ ((packed));
40
41 struct IO_APIC_reg_02 {
42 __u32 __reserved_2 : 24,
43 arbitration : 4,
44 __reserved_1 : 4;
45 } __attribute__ ((packed));
46
47 struct IO_APIC_reg_03 {
48 __u32 boot_DT : 1,
49 __reserved_1 : 31;
50 } __attribute__ ((packed));
51
52 /*
53 * # of IO-APICs and # of IRQ routing registers
54 */
55 extern int nr_ioapics;
56 extern int nr_ioapic_registers[MAX_IO_APICS];
57
58 enum ioapic_irq_destination_types {
59 dest_Fixed = 0,
60 dest_LowestPrio = 1,
61 dest_SMI = 2,
62 dest__reserved_1 = 3,
63 dest_NMI = 4,
64 dest_INIT = 5,
65 dest__reserved_2 = 6,
66 dest_ExtINT = 7
67 };
68
69 struct IO_APIC_route_entry {
70 __u32 vector : 8,
71 delivery_mode : 3, /* 000: FIXED
72 * 001: lowest prio
73 * 111: ExtINT
74 */
75 dest_mode : 1, /* 0: physical, 1: logical */
76 delivery_status : 1,
77 polarity : 1,
78 irr : 1,
79 trigger : 1, /* 0: edge, 1: level */
80 mask : 1, /* 0: enabled, 1: disabled */
81 __reserved_2 : 15;
82
83 union { struct { __u32
84 __reserved_1 : 24,
85 physical_dest : 4,
86 __reserved_2 : 4;
87 } physical;
88
89 struct { __u32
90 __reserved_1 : 24,
91 logical_dest : 8;
92 } logical;
93 } dest;
94
95 } __attribute__ ((packed));
96
97 /*
98 * MP-BIOS irq configuration table structures:
99 */
100
101 /* I/O APIC entries */
102 extern struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];
103
104 /* # of MP IRQ source entries */
105 extern int mp_irq_entries;
106
107 /* MP IRQ source entries */
108 extern struct mpc_config_intsrc *mp_irqs;
109
110 /* non-0 if default (table-less) MP configuration */
111 extern int mpc_default_type;
112
io_apic_read(unsigned int apic,unsigned int reg)113 static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
114 {
115 *IO_APIC_BASE(apic) = reg;
116 return *(IO_APIC_BASE(apic)+4);
117 }
118
io_apic_write(unsigned int apic,unsigned int reg,unsigned int value)119 static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
120 {
121 *IO_APIC_BASE(apic) = reg;
122 *(IO_APIC_BASE(apic)+4) = value;
123 }
124
125 /*
126 * Synchronize the IO-APIC and the CPU by doing
127 * a dummy read from the IO-APIC
128 */
io_apic_sync(unsigned int apic)129 static inline void io_apic_sync(unsigned int apic)
130 {
131 (void) *(IO_APIC_BASE(apic)+4);
132 }
133
134 /*
135 * If we use the IO-APIC for IRQ routing, disable automatic
136 * assignment of PCI IRQ's.
137 */
138 #define io_apic_assign_pci_irqs (mp_irq_entries && !skip_ioapic_setup)
139
140 #ifdef CONFIG_ACPI_BOOT
141 extern int io_apic_get_unique_id (int ioapic, int apic_id);
142 extern int io_apic_get_version (int ioapic);
143 extern int io_apic_get_redir_entries (int ioapic);
144 extern int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int active_high_low);
145 #endif
146
147 extern int skip_ioapic_setup; /* 1 for "noapic" */
148
disable_ioapic_setup(void)149 static inline void disable_ioapic_setup(void)
150 {
151 skip_ioapic_setup = 1;
152 }
153
ioapic_setup_disabled(void)154 static inline int ioapic_setup_disabled(void)
155 {
156 return skip_ioapic_setup;
157 }
158
159 #else /* !CONFIG_X86_IO_APIC */
160 #define io_apic_assign_pci_irqs 0
161
disable_ioapic_setup(void)162 static inline void disable_ioapic_setup(void)
163 { }
164
165 #endif /* !CONFIG_X86_IO_APIC */
166
167 #endif
168