5 * linux/include/asm/hw_irq.h
7 * (C) 1992, 1993 Linus Torvalds, (C) 1997 Ingo Molnar
9 * moved some of the old arch/i386/kernel/irq.h to here. VY
11 * IRQ/IPI changes taken from work by Thomas Radke
12 * <tomsoft@informatik.tu-chemnitz.de>
14 * hacked by Andi Kleen for x86-64.
18 #include <asm/atomic.h>
20 #include <linux/profile.h>
21 #include <linux/smp.h>
22 #include <linux/percpu.h>
25 #define NMI_VECTOR 0x02
27 * IDT vectors usable for external interrupt sources start
30 #define FIRST_EXTERNAL_VECTOR 0x20
32 #define IA32_SYSCALL_VECTOR 0x80
36 * Vectors 0x20-0x2f are used for ISA interrupts.
40 * Special IRQ vectors used by the SMP architecture, 0xf0-0xff
42 * some of the following vectors are 'rare', they are merged
43 * into a single vector (CALL_FUNCTION_VECTOR) to save vector space.
44 * TLB, reschedule and local APIC vectors are performance-critical.
46 #define SPURIOUS_APIC_VECTOR 0xff
47 #define ERROR_APIC_VECTOR 0xfe
48 #define RESCHEDULE_VECTOR 0xfd
49 #define CALL_FUNCTION_VECTOR 0xfc
50 /* fb free - please don't readd KDB here because it's useless
51 (hint - think what a NMI bit does to a vector) */
52 #define THERMAL_APIC_VECTOR 0xfa
53 #define THRESHOLD_APIC_VECTOR 0xf9
55 #define INVALIDATE_TLB_VECTOR_END 0xf7
56 #define INVALIDATE_TLB_VECTOR_START 0xf0 /* f0-f7 used for TLB flush */
58 #define NUM_INVALIDATE_TLB_VECTORS 8
61 * Local APIC timer IRQ vector is on a different priority level,
62 * to work around the 'lost local interrupt if more than 2 IRQ
63 * sources per level' errata.
65 #define LOCAL_TIMER_VECTOR 0xef
68 * First APIC vector available to drivers: (vectors 0x30-0xee)
69 * we start at 0x31 to spread out vectors evenly between priority
70 * levels. (0x80 is the syscall vector)
72 #define FIRST_DEVICE_VECTOR 0x31
73 #define FIRST_SYSTEM_VECTOR 0xef /* duplicated in irq.h */
77 typedef int vector_irq_t[NR_VECTORS];
78 DECLARE_PER_CPU(vector_irq_t, vector_irq);
79 extern void __setup_vector_irq(int cpu);
80 extern spinlock_t vector_lock;
83 * Various low-level irq details needed by irq.c, process.c,
84 * time.c, io_apic.c and smp.c
86 * Interrupt entry/exit code at both C and assembly level
89 extern void disable_8259A_irq(unsigned int irq);
90 extern void enable_8259A_irq(unsigned int irq);
91 extern int i8259A_irq_pending(unsigned int irq);
92 extern void make_8259A_irq(unsigned int irq);
93 extern void init_8259A(int aeoi);
94 extern void send_IPI_self(int vector);
95 extern void init_VISWS_APIC_irqs(void);
96 extern void setup_IO_APIC(void);
97 extern void disable_IO_APIC(void);
98 extern void print_IO_APIC(void);
99 extern int IO_APIC_get_PCI_irq_vector(int bus, int slot, int fn);
100 extern void send_IPI(int dest, int vector);
101 extern void setup_ioapic_dest(void);
103 extern unsigned long io_apic_irqs;
105 extern atomic_t irq_err_count;
106 extern atomic_t irq_mis_count;
108 #define IO_APIC_IRQ(x) (((x) >= 16) || ((1<<(x)) & io_apic_irqs))
111 #define STR(x) __STR(x)
113 #include <asm/ptrace.h>
115 #define IRQ_NAME2(nr) nr##_interrupt(void)
116 #define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr)
119 * SMP has a few special interrupts for IPI messages
122 #define BUILD_IRQ(nr) \
123 asmlinkage void IRQ_NAME(nr); \
126 "IRQ" #nr "_interrupt:\n\t" \
127 "push $~(" #nr ") ; " \
128 "jmp common_interrupt");
130 #define platform_legacy_irq(irq) ((irq) < 16)
134 #endif /* _ASM_HW_IRQ_H */