1 #ifndef _ASM_HW_IRQ_H
2 #define _ASM_HW_IRQ_H
3
4 /*
5 * linux/include/asm/hw_irq.h
6 *
7 * (C) 1992, 1993 Linus Torvalds, (C) 1997 Ingo Molnar
8 *
9 * moved some of the old arch/i386/kernel/irq.h to here. VY
10 *
11 * IRQ/IPI changes taken from work by Thomas Radke
12 * <tomsoft@informatik.tu-chemnitz.de>
13 *
14 * hacked by Andi Kleen for x86-64.
15 */
16
17 #ifndef __ASSEMBLY__
18 #include <asm/atomic.h>
19 #include <asm/irq.h>
20 #include <linux/profile.h>
21 #include <linux/smp.h>
22 #include <linux/percpu.h>
23 #endif
24
25 #define NMI_VECTOR 0x02
26 /*
27 * IDT vectors usable for external interrupt sources start
28 * at 0x20:
29 */
30 #define FIRST_EXTERNAL_VECTOR 0x20
31
32 #define IA32_SYSCALL_VECTOR 0x80
33
34
35 /* Reserve the lowest usable priority level 0x20 - 0x2f for triggering
36 * cleanup after irq migration.
37 */
38 #define IRQ_MOVE_CLEANUP_VECTOR FIRST_EXTERNAL_VECTOR
39
40 /*
41 * Vectors 0x30-0x3f are used for ISA interrupts.
42 */
43 #define IRQ0_VECTOR (FIRST_EXTERNAL_VECTOR + 0x10)
44 #define IRQ1_VECTOR (IRQ0_VECTOR + 1)
45 #define IRQ2_VECTOR (IRQ0_VECTOR + 2)
46 #define IRQ3_VECTOR (IRQ0_VECTOR + 3)
47 #define IRQ4_VECTOR (IRQ0_VECTOR + 4)
48 #define IRQ5_VECTOR (IRQ0_VECTOR + 5)
49 #define IRQ6_VECTOR (IRQ0_VECTOR + 6)
50 #define IRQ7_VECTOR (IRQ0_VECTOR + 7)
51 #define IRQ8_VECTOR (IRQ0_VECTOR + 8)
52 #define IRQ9_VECTOR (IRQ0_VECTOR + 9)
53 #define IRQ10_VECTOR (IRQ0_VECTOR + 10)
54 #define IRQ11_VECTOR (IRQ0_VECTOR + 11)
55 #define IRQ12_VECTOR (IRQ0_VECTOR + 12)
56 #define IRQ13_VECTOR (IRQ0_VECTOR + 13)
57 #define IRQ14_VECTOR (IRQ0_VECTOR + 14)
58 #define IRQ15_VECTOR (IRQ0_VECTOR + 15)
59
60 /*
61 * Special IRQ vectors used by the SMP architecture, 0xf0-0xff
62 *
63 * some of the following vectors are 'rare', they are merged
64 * into a single vector (CALL_FUNCTION_VECTOR) to save vector space.
65 * TLB, reschedule and local APIC vectors are performance-critical.
66 */
67 #define SPURIOUS_APIC_VECTOR 0xff
68 #define ERROR_APIC_VECTOR 0xfe
69 #define RESCHEDULE_VECTOR 0xfd
70 #define CALL_FUNCTION_VECTOR 0xfc
71 /* fb free - please don't readd KDB here because it's useless
72 (hint - think what a NMI bit does to a vector) */
73 #define THERMAL_APIC_VECTOR 0xfa
74 #define THRESHOLD_APIC_VECTOR 0xf9
75 /* f8 free */
76 #define INVALIDATE_TLB_VECTOR_END 0xf7
77 #define INVALIDATE_TLB_VECTOR_START 0xf0 /* f0-f7 used for TLB flush */
78
79 #define NUM_INVALIDATE_TLB_VECTORS 8
80
81 /*
82 * Local APIC timer IRQ vector is on a different priority level,
83 * to work around the 'lost local interrupt if more than 2 IRQ
84 * sources per level' errata.
85 */
86 #define LOCAL_TIMER_VECTOR 0xef
87
88 /*
89 * First APIC vector available to drivers: (vectors 0x30-0xee)
90 * we start at 0x41 to spread out vectors evenly between priority
91 * levels. (0x80 is the syscall vector)
92 */
93 #define FIRST_DEVICE_VECTOR (IRQ15_VECTOR + 2)
94 #define FIRST_SYSTEM_VECTOR 0xef /* duplicated in irq.h */
95
96
97 #ifndef __ASSEMBLY__
98
99 /* Interrupt handlers registered during init_IRQ */
100 void apic_timer_interrupt(void);
101 void spurious_interrupt(void);
102 void error_interrupt(void);
103 void reschedule_interrupt(void);
104 void call_function_interrupt(void);
105 void irq_move_cleanup_interrupt(void);
106 void invalidate_interrupt0(void);
107 void invalidate_interrupt1(void);
108 void invalidate_interrupt2(void);
109 void invalidate_interrupt3(void);
110 void invalidate_interrupt4(void);
111 void invalidate_interrupt5(void);
112 void invalidate_interrupt6(void);
113 void invalidate_interrupt7(void);
114 void thermal_interrupt(void);
115 void threshold_interrupt(void);
116 void i8254_timer_resume(void);
117
118 typedef int vector_irq_t[NR_VECTORS];
119 DECLARE_PER_CPU(vector_irq_t, vector_irq);
120 extern void __setup_vector_irq(int cpu);
121 extern raw_spinlock_t vector_lock;
122
123 /*
124 * Various low-level irq details needed by irq.c, process.c,
125 * time.c, io_apic.c and smp.c
126 *
127 * Interrupt entry/exit code at both C and assembly level
128 */
129
130 extern void disable_8259A_irq(unsigned int irq);
131 extern void enable_8259A_irq(unsigned int irq);
132 extern int i8259A_irq_pending(unsigned int irq);
133 extern void make_8259A_irq(unsigned int irq);
134 extern void init_8259A(int aeoi);
135 extern void send_IPI_self(int vector);
136 extern void init_VISWS_APIC_irqs(void);
137 extern void setup_IO_APIC(void);
138 extern void enable_IO_APIC(void);
139 extern void disable_IO_APIC(void);
140 extern void print_IO_APIC(void);
141 extern int IO_APIC_get_PCI_irq_vector(int bus, int slot, int fn);
142 extern void send_IPI(int dest, int vector);
143 extern void setup_ioapic_dest(void);
144 extern void native_init_IRQ(void);
145
146 extern unsigned long io_apic_irqs;
147
148 extern atomic_t irq_err_count;
149 extern atomic_t irq_mis_count;
150
151 #define IO_APIC_IRQ(x) (((x) >= 16) || ((1<<(x)) & io_apic_irqs))
152
153 #include <asm/ptrace.h>
154
155 #define IRQ_NAME2(nr) nr##_interrupt(void)
156 #define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr)
157
158 /*
159 * SMP has a few special interrupts for IPI messages
160 */
161
162 #define BUILD_IRQ(nr) \
163 asmlinkage void IRQ_NAME(nr); \
164 __asm__( \
165 "\n.p2align\n" \
166 "IRQ" #nr "_interrupt:\n\t" \
167 "push $~(" #nr ") ; " \
168 "jmp common_interrupt");
169
170 #define platform_legacy_irq(irq) ((irq) < 16)
171
172 #endif
173
174 #endif /* _ASM_HW_IRQ_H */
175
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