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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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 * $Id: hw_irq.h,v 1.24 2001/09/14 20:55:03 vojtech Exp $
17 */
18
19#ifndef __ASSEMBLY__
20#include <linux/config.h>
21#include <asm/atomic.h>
22#include <asm/irq.h>
23#include <linux/profile.h>
24#include <linux/smp.h>
25
26struct hw_interrupt_type;
27#endif
28
29/*
30 * IDT vectors usable for external interrupt sources start
31 * at 0x20:
32 */
33#define FIRST_EXTERNAL_VECTOR 0x20
34
35#define IA32_SYSCALL_VECTOR 0x80
36
37
38/*
39 * Vectors 0x20-0x2f are used for ISA interrupts.
40 */
41
42/*
43 * Special IRQ vectors used by the SMP architecture, 0xf0-0xff
44 *
45 * some of the following vectors are 'rare', they are merged
46 * into a single vector (CALL_FUNCTION_VECTOR) to save vector space.
47 * TLB, reschedule and local APIC vectors are performance-critical.
48 *
49 * Vectors 0xf0-0xf9 are free (reserved for future Linux use).
50 */
51#define SPURIOUS_APIC_VECTOR 0xff
52#define ERROR_APIC_VECTOR 0xfe
Andi Kleene5bc8b62005-09-12 18:49:24 +020053#define RESCHEDULE_VECTOR 0xfd
54#define CALL_FUNCTION_VECTOR 0xfc
55#define KDB_VECTOR 0xfb /* reserved for KDB */
56#define THERMAL_APIC_VECTOR 0xfa
57/* 0xf9 free */
58#define INVALIDATE_TLB_VECTOR_END 0xf8
59#define INVALIDATE_TLB_VECTOR_START 0xf0 /* f0-f8 used for TLB flush */
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
Andi Kleene5bc8b62005-09-12 18:49:24 +020061#define NUM_INVALIDATE_TLB_VECTORS 8
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
63/*
64 * Local APIC timer IRQ vector is on a different priority level,
65 * to work around the 'lost local interrupt if more than 2 IRQ
66 * sources per level' errata.
67 */
68#define LOCAL_TIMER_VECTOR 0xef
69
70/*
71 * First APIC vector available to drivers: (vectors 0x30-0xee)
72 * we start at 0x31 to spread out vectors evenly between priority
73 * levels. (0x80 is the syscall vector)
74 */
75#define FIRST_DEVICE_VECTOR 0x31
76#define FIRST_SYSTEM_VECTOR 0xef /* duplicated in irq.h */
77
78
79#ifndef __ASSEMBLY__
80extern u8 irq_vector[NR_IRQ_VECTORS];
81#define IO_APIC_VECTOR(irq) (irq_vector[irq])
82#define AUTO_ASSIGN -1
83
84/*
85 * Various low-level irq details needed by irq.c, process.c,
86 * time.c, io_apic.c and smp.c
87 *
88 * Interrupt entry/exit code at both C and assembly level
89 */
90
91extern void disable_8259A_irq(unsigned int irq);
92extern void enable_8259A_irq(unsigned int irq);
93extern int i8259A_irq_pending(unsigned int irq);
94extern void make_8259A_irq(unsigned int irq);
95extern void init_8259A(int aeoi);
96extern void FASTCALL(send_IPI_self(int vector));
97extern void init_VISWS_APIC_irqs(void);
98extern void setup_IO_APIC(void);
99extern void disable_IO_APIC(void);
100extern void print_IO_APIC(void);
101extern int IO_APIC_get_PCI_irq_vector(int bus, int slot, int fn);
102extern void send_IPI(int dest, int vector);
103extern void setup_ioapic_dest(void);
104
105extern unsigned long io_apic_irqs;
106
107extern atomic_t irq_err_count;
108extern atomic_t irq_mis_count;
109
110#define IO_APIC_IRQ(x) (((x) >= 16) || ((1<<(x)) & io_apic_irqs))
111
112#define __STR(x) #x
113#define STR(x) __STR(x)
114
115#include <asm/ptrace.h>
116
117#define IRQ_NAME2(nr) nr##_interrupt(void)
118#define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr)
119
120/*
121 * SMP has a few special interrupts for IPI messages
122 */
123
124#define BUILD_IRQ(nr) \
125asmlinkage void IRQ_NAME(nr); \
126__asm__( \
127"\n.p2align\n" \
128"IRQ" #nr "_interrupt:\n\t" \
129 "push $" #nr "-256 ; " \
130 "jmp common_interrupt");
131
132#if defined(CONFIG_X86_IO_APIC)
133static inline void hw_resend_irq(struct hw_interrupt_type *h, unsigned int i) {
134 if (IO_APIC_IRQ(i))
135 send_IPI_self(IO_APIC_VECTOR(i));
136}
137#else
138static inline void hw_resend_irq(struct hw_interrupt_type *h, unsigned int i) {}
139#endif
140
141#define platform_legacy_irq(irq) ((irq) < 16)
142
143#endif
144
145#endif /* _ASM_HW_IRQ_H */