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.
47 #define SPURIOUS_APIC_VECTOR 0xff
48 #define ERROR_APIC_VECTOR 0xfe
49 #define RESCHEDULE_VECTOR 0xfd
50 #define CALL_FUNCTION_VECTOR 0xfc
51 /* fb free - please don't readd KDB here because it's useless
52 (hint - think what a NMI bit does to a vector) */
53 #define THERMAL_APIC_VECTOR 0xfa
54 #define THRESHOLD_APIC_VECTOR 0xf9
56 #define INVALIDATE_TLB_VECTOR_END 0xf7
57 #define INVALIDATE_TLB_VECTOR_START 0xf0 /* f0-f7 used for TLB flush */
59 #define NUM_INVALIDATE_TLB_VECTORS 8
63 * Local APIC timer IRQ vector is on a different priority level,
64 * to work around the 'lost local interrupt if more than 2 IRQ
65 * sources per level' errata.
67 #define LOCAL_TIMER_VECTOR 0xef
70 * First APIC vector available to drivers: (vectors 0x30-0xee)
71 * we start at 0x31 to spread out vectors evenly between priority
72 * levels. (0x80 is the syscall vector)
74 #define FIRST_DEVICE_VECTOR 0x31
75 #define FIRST_SYSTEM_VECTOR 0xef /* duplicated in irq.h */
79 typedef int vector_irq_t[NR_VECTORS];
80 DECLARE_PER_CPU(vector_irq_t, vector_irq);
81 extern void __setup_vector_irq(int cpu);
82 extern spinlock_t vector_lock;
85 * Various low-level irq details needed by irq.c, process.c,
86 * time.c, io_apic.c and smp.c
88 * Interrupt entry/exit code at both C and assembly level
91 extern void disable_8259A_irq(unsigned int irq);
92 extern void enable_8259A_irq(unsigned int irq);
93 extern int i8259A_irq_pending(unsigned int irq);
94 extern void make_8259A_irq(unsigned int irq);
95 extern void init_8259A(int aeoi);
96 extern void FASTCALL(send_IPI_self(int vector));
97 extern void init_VISWS_APIC_irqs(void);
98 extern void setup_IO_APIC(void);
99 extern void disable_IO_APIC(void);
100 extern void print_IO_APIC(void);
101 extern int IO_APIC_get_PCI_irq_vector(int bus, int slot, int fn);
102 extern void send_IPI(int dest, int vector);
103 extern void setup_ioapic_dest(void);
105 extern unsigned long io_apic_irqs;
107 extern atomic_t irq_err_count;
108 extern atomic_t irq_mis_count;
110 #define IO_APIC_IRQ(x) (((x) >= 16) || ((1<<(x)) & io_apic_irqs))
113 #define STR(x) __STR(x)
115 #include <asm/ptrace.h>
117 #define IRQ_NAME2(nr) nr##_interrupt(void)
118 #define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr)
121 * SMP has a few special interrupts for IPI messages
124 #define BUILD_IRQ(nr) \
125 asmlinkage void IRQ_NAME(nr); \
128 "IRQ" #nr "_interrupt:\n\t" \
129 "push $" #nr "-256 ; " \
130 "jmp common_interrupt");
132 #define platform_legacy_irq(irq) ((irq) < 16)
136 #endif /* _ASM_HW_IRQ_H */