1 /*
2 * This file should contain #defines for all of the interrupt vector
3 * numbers used by this architecture.
4 *
5 * In addition, there are some standard defines:
6 *
7 * FIRST_EXTERNAL_VECTOR:
8 * The first free place for external interrupts
9 *
10 * SYSCALL_VECTOR:
11 * The IRQ vector a syscall makes the user to kernel transition
12 * under.
13 *
14 * TIMER_IRQ:
15 * The IRQ number the timer interrupt comes in at.
16 *
17 * NR_IRQS:
18 * The total number of interrupt vectors (including all the
19 * architecture specific interrupts) needed.
20 *
21 */
22 #ifndef _ASM_IRQ_VECTORS_H
23 #define _ASM_IRQ_VECTORS_H
24
25 /*
26 * IDT vectors usable for external interrupt sources start
27 * at 0x20:
28 */
29 #define FIRST_EXTERNAL_VECTOR 0x20
30
31 #define SYSCALL_VECTOR 0x80
32
33 /*
34 * Vectors 0x20-0x2f are used for ISA interrupts.
35 */
36
37 /*
38 * Special IRQ vectors used by the SMP architecture, 0xf0-0xff
39 *
40 * some of the following vectors are 'rare', they are merged
41 * into a single vector (CALL_FUNCTION_VECTOR) to save vector space.
42 * TLB, reschedule and local APIC vectors are performance-critical.
43 *
44 * Vectors 0xf0-0xfa are free (reserved for future Linux use).
45 */
46 #define SPURIOUS_APIC_VECTOR 0xff
47 #define ERROR_APIC_VECTOR 0xfe
48 #define INVALIDATE_TLB_VECTOR 0xfd
49 #define RESCHEDULE_VECTOR 0xfc
50 #define CALL_FUNCTION_VECTOR 0xfb
51
52 #define THERMAL_APIC_VECTOR 0xf0
53 /*
54 * Local APIC timer IRQ vector is on a different priority level,
55 * to work around the 'lost local interrupt if more than 2 IRQ
56 * sources per level' errata.
57 */
58 #define LOCAL_TIMER_VECTOR 0xef
59
60 /*
61 * First APIC vector available to drivers: (vectors 0x30-0xee)
62 * we start at 0x31 to spread out vectors evenly between priority
63 * levels. (0x80 is the syscall vector)
64 */
65 #define FIRST_DEVICE_VECTOR 0x31
66 #define FIRST_SYSTEM_VECTOR 0xef
67
68 #define TIMER_IRQ 0
69
70 /*
71 * 16 8259A IRQ's, 208 potential APIC interrupt sources.
72 * Right now the APIC is mostly only used for SMP.
73 * 256 vectors is an architectural limit. (we can have
74 * more than 256 devices theoretically, but they will
75 * have to use shared interrupts)
76 * Since vectors 0x00-0x1f are used/reserved for the CPU,
77 * the usable vector space is 0x20-0xff (224 vectors)
78 */
79
80 /*
81 * The maximum number of vectors supported by i386 processors
82 * is limited to 256. For processors other than i386, NR_VECTORS
83 * should be changed accordingly.
84 */
85 #define NR_VECTORS 256
86
87 #include "irq_vectors_limits.h"
88
89 #define FPU_IRQ 13
90
91 #define FIRST_VM86_IRQ 3
92 #define LAST_VM86_IRQ 15
93 #define invalid_vm86_irq(irq) ((irq) < 3 || (irq) > 15)
94
95
96 #endif /* _ASM_IRQ_VECTORS_H */
97
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