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1965aae3 PA |
1 | #ifndef _ASM_X86_IRQ_VECTORS_H |
2 | #define _ASM_X86_IRQ_VECTORS_H | |
9b7dc567 | 3 | |
60f6e65d | 4 | #include <linux/threads.h> |
9fc2e79d IM |
5 | /* |
6 | * Linux IRQ vector layout. | |
7 | * | |
8 | * There are 256 IDT entries (per CPU - each entry is 8 bytes) which can | |
9 | * be defined by Linux. They are used as a jump table by the CPU when a | |
10 | * given vector is triggered - by a CPU-external, CPU-internal or | |
11 | * software-triggered event. | |
12 | * | |
13 | * Linux sets the kernel code address each entry jumps to early during | |
14 | * bootup, and never changes them. This is the general layout of the | |
15 | * IDT entries: | |
16 | * | |
17 | * Vectors 0 ... 31 : system traps and exceptions - hardcoded events | |
18 | * Vectors 32 ... 127 : device interrupts | |
19 | * Vector 128 : legacy int80 syscall interface | |
5cec93c2 | 20 | * Vectors 129 ... INVALIDATE_TLB_VECTOR_START-1 except 204 : device interrupts |
70e4a369 | 21 | * Vectors INVALIDATE_TLB_VECTOR_START ... 255 : special interrupts |
9fc2e79d IM |
22 | * |
23 | * 64-bit x86 has per CPU IDT tables, 32-bit has one shared IDT table. | |
24 | * | |
25 | * This file enumerates the exact layout of them: | |
26 | */ | |
27 | ||
28 | #define NMI_VECTOR 0x02 | |
8fa8dd9e | 29 | #define MCE_VECTOR 0x12 |
9b7dc567 TG |
30 | |
31 | /* | |
6579b474 SS |
32 | * IDT vectors usable for external interrupt sources start at 0x20. |
33 | * (0x80 is the syscall vector, 0x30-0x3f are for ISA) | |
9b7dc567 | 34 | */ |
6579b474 SS |
35 | #define FIRST_EXTERNAL_VECTOR 0x20 |
36 | /* | |
37 | * We start allocating at 0x21 to spread out vectors evenly between | |
38 | * priority levels. (0x80 is the syscall vector) | |
39 | */ | |
40 | #define VECTOR_OFFSET_START 1 | |
41 | ||
42 | /* | |
43 | * Reserve the lowest usable vector (and hence lowest priority) 0x20 for | |
44 | * triggering cleanup after irq migration. 0x21-0x2f will still be used | |
45 | * for device interrupts. | |
46 | */ | |
47 | #define IRQ_MOVE_CLEANUP_VECTOR FIRST_EXTERNAL_VECTOR | |
9b7dc567 | 48 | |
99d113b1 | 49 | #define IA32_SYSCALL_VECTOR 0x80 |
9b7dc567 TG |
50 | |
51 | /* | |
6579b474 | 52 | * Vectors 0x30-0x3f are used for ISA interrupts. |
99d113b1 | 53 | * round up to the next 16-vector boundary |
9b7dc567 | 54 | */ |
99d113b1 | 55 | #define IRQ0_VECTOR ((FIRST_EXTERNAL_VECTOR + 16) & ~15) |
9fc2e79d IM |
56 | |
57 | #define IRQ1_VECTOR (IRQ0_VECTOR + 1) | |
58 | #define IRQ2_VECTOR (IRQ0_VECTOR + 2) | |
59 | #define IRQ3_VECTOR (IRQ0_VECTOR + 3) | |
60 | #define IRQ4_VECTOR (IRQ0_VECTOR + 4) | |
61 | #define IRQ5_VECTOR (IRQ0_VECTOR + 5) | |
62 | #define IRQ6_VECTOR (IRQ0_VECTOR + 6) | |
63 | #define IRQ7_VECTOR (IRQ0_VECTOR + 7) | |
64 | #define IRQ8_VECTOR (IRQ0_VECTOR + 8) | |
65 | #define IRQ9_VECTOR (IRQ0_VECTOR + 9) | |
66 | #define IRQ10_VECTOR (IRQ0_VECTOR + 10) | |
67 | #define IRQ11_VECTOR (IRQ0_VECTOR + 11) | |
68 | #define IRQ12_VECTOR (IRQ0_VECTOR + 12) | |
69 | #define IRQ13_VECTOR (IRQ0_VECTOR + 13) | |
70 | #define IRQ14_VECTOR (IRQ0_VECTOR + 14) | |
71 | #define IRQ15_VECTOR (IRQ0_VECTOR + 15) | |
9b7dc567 TG |
72 | |
73 | /* | |
74 | * Special IRQ vectors used by the SMP architecture, 0xf0-0xff | |
75 | * | |
76 | * some of the following vectors are 'rare', they are merged | |
77 | * into a single vector (CALL_FUNCTION_VECTOR) to save vector space. | |
78 | * TLB, reschedule and local APIC vectors are performance-critical. | |
9b7dc567 | 79 | */ |
02cf94c3 | 80 | |
5da690d2 | 81 | #define SPURIOUS_APIC_VECTOR 0xff |
647ad94f IM |
82 | /* |
83 | * Sanity check | |
84 | */ | |
85 | #if ((SPURIOUS_APIC_VECTOR & 0x0F) != 0x0F) | |
86 | # error SPURIOUS_APIC_VECTOR definition error | |
87 | #endif | |
88 | ||
5da690d2 IM |
89 | #define ERROR_APIC_VECTOR 0xfe |
90 | #define RESCHEDULE_VECTOR 0xfd | |
91 | #define CALL_FUNCTION_VECTOR 0xfc | |
92 | #define CALL_FUNCTION_SINGLE_VECTOR 0xfb | |
93 | #define THERMAL_APIC_VECTOR 0xfa | |
7856f6cc | 94 | #define THRESHOLD_APIC_VECTOR 0xf9 |
4ef702c1 | 95 | #define REBOOT_VECTOR 0xf8 |
9b7dc567 | 96 | |
193c81b9 | 97 | /* |
acaabe79 | 98 | * Generic system vector for platform specific use |
193c81b9 | 99 | */ |
60f6e65d | 100 | #define X86_PLATFORM_IPI_VECTOR 0xf7 |
193c81b9 | 101 | |
d78f2664 YZ |
102 | /* Vector for KVM to deliver posted interrupt IPI */ |
103 | #ifdef CONFIG_HAVE_KVM | |
104 | #define POSTED_INTR_VECTOR 0xf2 | |
105 | #endif | |
106 | ||
acaabe79 | 107 | /* |
e360adbe | 108 | * IRQ work vector: |
acaabe79 | 109 | */ |
60f6e65d | 110 | #define IRQ_WORK_VECTOR 0xf6 |
acaabe79 | 111 | |
60f6e65d | 112 | #define UV_BAU_MESSAGE 0xf5 |
4ef702c1 | 113 | |
bc2b0331 S |
114 | /* Vector on which hypervisor callbacks will be delivered */ |
115 | #define HYPERVISOR_CALLBACK_VECTOR 0xf3 | |
60f6e65d SL |
116 | |
117 | /* | |
118 | * Local APIC timer IRQ vector is on a different priority level, | |
119 | * to work around the 'lost local interrupt if more than 2 IRQ | |
120 | * sources per level' errata. | |
121 | */ | |
122 | #define LOCAL_TIMER_VECTOR 0xef | |
123 | ||
9fc2e79d | 124 | #define NR_VECTORS 256 |
9b7dc567 | 125 | |
2414e021 JB |
126 | #ifdef CONFIG_X86_LOCAL_APIC |
127 | #define FIRST_SYSTEM_VECTOR LOCAL_TIMER_VECTOR | |
128 | #else | |
129 | #define FIRST_SYSTEM_VECTOR NR_VECTORS | |
130 | #endif | |
131 | ||
9fc2e79d | 132 | #define FPU_IRQ 13 |
9b7dc567 | 133 | |
9fc2e79d IM |
134 | #define FIRST_VM86_IRQ 3 |
135 | #define LAST_VM86_IRQ 15 | |
d8106d2e IM |
136 | |
137 | #ifndef __ASSEMBLY__ | |
138 | static inline int invalid_vm86_irq(int irq) | |
139 | { | |
57e37293 | 140 | return irq < FIRST_VM86_IRQ || irq > LAST_VM86_IRQ; |
d8106d2e IM |
141 | } |
142 | #endif | |
9b7dc567 | 143 | |
009eb3fe IM |
144 | /* |
145 | * Size the maximum number of interrupts. | |
146 | * | |
147 | * If the irq_desc[] array has a sparse layout, we can size things | |
148 | * generously - it scales up linearly with the maximum number of CPUs, | |
149 | * and the maximum number of IO-APICs, whichever is higher. | |
150 | * | |
151 | * In other cases we size more conservatively, to not create too large | |
152 | * static arrays. | |
153 | */ | |
154 | ||
9fc2e79d | 155 | #define NR_IRQS_LEGACY 16 |
99d093d1 | 156 | |
009eb3fe IM |
157 | #define IO_APIC_VECTOR_LIMIT ( 32 * MAX_IO_APICS ) |
158 | ||
3e92ab3d | 159 | #ifdef CONFIG_X86_IO_APIC |
141d55e6 YL |
160 | # define CPU_VECTOR_LIMIT (64 * NR_CPUS) |
161 | # define NR_IRQS \ | |
009eb3fe IM |
162 | (CPU_VECTOR_LIMIT > IO_APIC_VECTOR_LIMIT ? \ |
163 | (NR_VECTORS + CPU_VECTOR_LIMIT) : \ | |
164 | (NR_VECTORS + IO_APIC_VECTOR_LIMIT)) | |
3e92ab3d | 165 | #else /* !CONFIG_X86_IO_APIC: */ |
009eb3fe | 166 | # define NR_IRQS NR_IRQS_LEGACY |
1b489768 | 167 | #endif |
9b7dc567 | 168 | |
1965aae3 | 169 | #endif /* _ASM_X86_IRQ_VECTORS_H */ |