summaryrefslogtreecommitdiff
path: root/arch/x86/include/asm/irq_vectors.h
blob: 1508e518c7e3b1b98a8ee19c3c33920a0bcba170 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
#ifndef _ASM_X86_IRQ_VECTORS_H
#define _ASM_X86_IRQ_VECTORS_H

#include <linux/threads.h>
/*
 * Linux IRQ vector layout.
 *
 * There are 256 IDT entries (per CPU - each entry is 8 bytes) which can
 * be defined by Linux. They are used as a jump table by the CPU when a
 * given vector is triggered - by a CPU-external, CPU-internal or
 * software-triggered event.
 *
 * Linux sets the kernel code address each entry jumps to early during
 * bootup, and never changes them. This is the general layout of the
 * IDT entries:
 *
 *  Vectors   0 ...  31 : system traps and exceptions - hardcoded events
 *  Vectors  32 ... 127 : device interrupts
 *  Vector  128         : legacy int80 syscall interface
 *  Vectors 129 ... INVALIDATE_TLB_VECTOR_START-1 except 204 : device interrupts
 *  Vectors INVALIDATE_TLB_VECTOR_START ... 255 : special interrupts
 *
 * 64-bit x86 has per CPU IDT tables, 32-bit has one shared IDT table.
 *
 * This file enumerates the exact layout of them:
 */

#define NMI_VECTOR			0x02
#define MCE_VECTOR			0x12

/*
 * IDT vectors usable for external interrupt sources start at 0x20.
 * (0x80 is the syscall vector, 0x30-0x3f are for ISA)
 */
#define FIRST_EXTERNAL_VECTOR		0x20
/*
 * We start allocating at 0x21 to spread out vectors evenly between
 * priority levels. (0x80 is the syscall vector)
 */
#define VECTOR_OFFSET_START		1

/*
 * Reserve the lowest usable vector (and hence lowest priority)  0x20 for
 * triggering cleanup after irq migration. 0x21-0x2f will still be used
 * for device interrupts.
 */
#define IRQ_MOVE_CLEANUP_VECTOR		FIRST_EXTERNAL_VECTOR

#define IA32_SYSCALL_VECTOR		0x80
#ifdef CONFIG_X86_32
# define SYSCALL_VECTOR			0x80
#endif

/*
 * Vectors 0x30-0x3f are used for ISA interrupts.
 *   round up to the next 16-vector boundary
 */
#define IRQ0_VECTOR			((FIRST_EXTERNAL_VECTOR + 16) & ~15)

#define IRQ1_VECTOR			(IRQ0_VECTOR +  1)
#define IRQ2_VECTOR			(IRQ0_VECTOR +  2)
#define IRQ3_VECTOR			(IRQ0_VECTOR +  3)
#define IRQ4_VECTOR			(IRQ0_VECTOR +  4)
#define IRQ5_VECTOR			(IRQ0_VECTOR +  5)
#define IRQ6_VECTOR			(IRQ0_VECTOR +  6)
#define IRQ7_VECTOR			(IRQ0_VECTOR +  7)
#define IRQ8_VECTOR			(IRQ0_VECTOR +  8)
#define IRQ9_VECTOR			(IRQ0_VECTOR +  9)
#define IRQ10_VECTOR			(IRQ0_VECTOR + 10)
#define IRQ11_VECTOR			(IRQ0_VECTOR + 11)
#define IRQ12_VECTOR			(IRQ0_VECTOR + 12)
#define IRQ13_VECTOR			(IRQ0_VECTOR + 13)
#define IRQ14_VECTOR			(IRQ0_VECTOR + 14)
#define IRQ15_VECTOR			(IRQ0_VECTOR + 15)

/*
 * Special IRQ vectors used by the SMP architecture, 0xf0-0xff
 *
 *  some of the following vectors are 'rare', they are merged
 *  into a single vector (CALL_FUNCTION_VECTOR) to save vector space.
 *  TLB, reschedule and local APIC vectors are performance-critical.
 */

#define SPURIOUS_APIC_VECTOR		0xff
/*
 * Sanity check
 */
#if ((SPURIOUS_APIC_VECTOR & 0x0F) != 0x0F)
# error SPURIOUS_APIC_VECTOR definition error
#endif

#define ERROR_APIC_VECTOR		0xfe
#define RESCHEDULE_VECTOR		0xfd
#define CALL_FUNCTION_VECTOR		0xfc
#define CALL_FUNCTION_SINGLE_VECTOR	0xfb
#define THERMAL_APIC_VECTOR		0xfa
#define THRESHOLD_APIC_VECTOR		0xf9
#define REBOOT_VECTOR			0xf8

/*
 * Generic system vector for platform specific use
 */
#define X86_PLATFORM_IPI_VECTOR		0xf7

/*
 * IRQ work vector:
 */
#define IRQ_WORK_VECTOR			0xf6

#define UV_BAU_MESSAGE			0xf5

/* Xen vector callback to receive events in a HVM domain */
#define XEN_HVM_EVTCHN_CALLBACK		0xf3

/*
 * Local APIC timer IRQ vector is on a different priority level,
 * to work around the 'lost local interrupt if more than 2 IRQ
 * sources per level' errata.
 */
#define LOCAL_TIMER_VECTOR		0xef

#define NR_VECTORS			 256

#define FPU_IRQ				  13

#define	FIRST_VM86_IRQ			   3
#define LAST_VM86_IRQ			  15

#ifndef __ASSEMBLY__
static inline int invalid_vm86_irq(int irq)
{
	return irq < FIRST_VM86_IRQ || irq > LAST_VM86_IRQ;
}
#endif

/*
 * Size the maximum number of interrupts.
 *
 * If the irq_desc[] array has a sparse layout, we can size things
 * generously - it scales up linearly with the maximum number of CPUs,
 * and the maximum number of IO-APICs, whichever is higher.
 *
 * In other cases we size more conservatively, to not create too large
 * static arrays.
 */

#define NR_IRQS_LEGACY			  16

#define IO_APIC_VECTOR_LIMIT		( 32 * MAX_IO_APICS )

#ifdef CONFIG_X86_IO_APIC
# define CPU_VECTOR_LIMIT		(64 * NR_CPUS)
# define NR_IRQS					\
	(CPU_VECTOR_LIMIT > IO_APIC_VECTOR_LIMIT ?	\
		(NR_VECTORS + CPU_VECTOR_LIMIT)  :	\
		(NR_VECTORS + IO_APIC_VECTOR_LIMIT))
#else /* !CONFIG_X86_IO_APIC: */
# define NR_IRQS			NR_IRQS_LEGACY
#endif

#endif /* _ASM_X86_IRQ_VECTORS_H */