1 #ifndef _ASM_X86_IRQ_VECTORS_H
2 #define _ASM_X86_IRQ_VECTORS_H
4 #include <linux/threads.h>
7 * Linux IRQ vector layout.
9 * There are 256 IDT entries (per CPU - each entry is 8 bytes) which can
10 * be defined by Linux. They are used as a jump table by the CPU when a
11 * given vector is triggered - by a CPU-external, CPU-internal or
12 * software-triggered event.
14 * Linux sets the kernel code address each entry jumps to early during
15 * bootup, and never changes them. This is the general layout of the
18 * Vectors 0 ... 31 : system traps and exceptions - hardcoded events
19 * Vectors 32 ... 127 : device interrupts
20 * Vector 128 : legacy int80 syscall interface
21 * Vectors 129 ... 237 : device interrupts
22 * Vectors 238 ... 255 : special interrupts
24 * 64-bit x86 has per CPU IDT tables, 32-bit has one shared IDT table.
26 * This file enumerates the exact layout of them:
29 #define NMI_VECTOR 0x02
32 * IDT vectors usable for external interrupt sources start
35 #define FIRST_EXTERNAL_VECTOR 0x20
38 # define SYSCALL_VECTOR 0x80
40 # define IA32_SYSCALL_VECTOR 0x80
44 * Reserve the lowest usable priority level 0x20 - 0x2f for triggering
45 * cleanup after irq migration.
47 #define IRQ_MOVE_CLEANUP_VECTOR FIRST_EXTERNAL_VECTOR
50 * Vectors 0x30-0x3f are used for ISA interrupts.
52 #define IRQ0_VECTOR (FIRST_EXTERNAL_VECTOR + 0x10)
54 #define IRQ1_VECTOR (IRQ0_VECTOR + 1)
55 #define IRQ2_VECTOR (IRQ0_VECTOR + 2)
56 #define IRQ3_VECTOR (IRQ0_VECTOR + 3)
57 #define IRQ4_VECTOR (IRQ0_VECTOR + 4)
58 #define IRQ5_VECTOR (IRQ0_VECTOR + 5)
59 #define IRQ6_VECTOR (IRQ0_VECTOR + 6)
60 #define IRQ7_VECTOR (IRQ0_VECTOR + 7)
61 #define IRQ8_VECTOR (IRQ0_VECTOR + 8)
62 #define IRQ9_VECTOR (IRQ0_VECTOR + 9)
63 #define IRQ10_VECTOR (IRQ0_VECTOR + 10)
64 #define IRQ11_VECTOR (IRQ0_VECTOR + 11)
65 #define IRQ12_VECTOR (IRQ0_VECTOR + 12)
66 #define IRQ13_VECTOR (IRQ0_VECTOR + 13)
67 #define IRQ14_VECTOR (IRQ0_VECTOR + 14)
68 #define IRQ15_VECTOR (IRQ0_VECTOR + 15)
71 * Special IRQ vectors used by the SMP architecture, 0xf0-0xff
73 * some of the following vectors are 'rare', they are merged
74 * into a single vector (CALL_FUNCTION_VECTOR) to save vector space.
75 * TLB, reschedule and local APIC vectors are performance-critical.
78 #define SPURIOUS_APIC_VECTOR 0xff
82 #if ((SPURIOUS_APIC_VECTOR & 0x0F) != 0x0F)
83 # error SPURIOUS_APIC_VECTOR definition error
86 #define ERROR_APIC_VECTOR 0xfe
87 #define RESCHEDULE_VECTOR 0xfd
88 #define CALL_FUNCTION_VECTOR 0xfc
89 #define CALL_FUNCTION_SINGLE_VECTOR 0xfb
90 #define THERMAL_APIC_VECTOR 0xfa
93 /* 0xf8 - 0xf9 : free */
95 # define THRESHOLD_APIC_VECTOR 0xf9
96 # define UV_BAU_MESSAGE 0xf8
99 /* f0-f7 used for spreading out TLB flushes: */
100 #define INVALIDATE_TLB_VECTOR_END 0xf7
101 #define INVALIDATE_TLB_VECTOR_START 0xf0
102 #define NUM_INVALIDATE_TLB_VECTORS 8
105 * Local APIC timer IRQ vector is on a different priority level,
106 * to work around the 'lost local interrupt if more than 2 IRQ
107 * sources per level' errata.
109 #define LOCAL_TIMER_VECTOR 0xef
112 * Performance monitoring interrupt vector:
114 #define LOCAL_PERF_VECTOR 0xee
117 * First APIC vector available to drivers: (vectors 0x30-0xee) we
118 * start at 0x31(0x41) to spread out vectors evenly between priority
119 * levels. (0x80 is the syscall vector)
121 #define FIRST_DEVICE_VECTOR (IRQ15_VECTOR + 2)
123 #define NR_VECTORS 256
127 #define FIRST_VM86_IRQ 3
128 #define LAST_VM86_IRQ 15
129 #define invalid_vm86_irq(irq) ((irq) < 3 || (irq) > 15)
131 #define NR_IRQS_LEGACY 16
133 #ifdef CONFIG_X86_IO_APIC
135 #include <asm/apicnum.h> /* need MAX_IO_APICS */
137 #ifndef CONFIG_SPARSE_IRQ
138 # if NR_CPUS < MAX_IO_APICS
139 # define NR_IRQS (NR_VECTORS + (32 * NR_CPUS))
141 # define NR_IRQS (NR_VECTORS + (32 * MAX_IO_APICS))
145 ((8 * NR_CPUS) > (32 * MAX_IO_APICS) ? \
146 (NR_VECTORS + (8 * NR_CPUS)) : \
147 (NR_VECTORS + (32 * MAX_IO_APICS)))
150 #else /* !CONFIG_X86_IO_APIC: */
154 #endif /* _ASM_X86_IRQ_VECTORS_H */