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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 | * $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 | ||
26 | struct 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 | |
53 | #define INVALIDATE_TLB_VECTOR 0xfd | |
54 | #define RESCHEDULE_VECTOR 0xfc | |
55 | #define TASK_MIGRATION_VECTOR 0xfb | |
56 | #define CALL_FUNCTION_VECTOR 0xfa | |
57 | #define KDB_VECTOR 0xf9 | |
58 | ||
59 | #define THERMAL_APIC_VECTOR 0xf0 | |
60 | ||
61 | ||
62 | /* | |
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. | |
66 | */ | |
67 | #define LOCAL_TIMER_VECTOR 0xef | |
68 | ||
69 | /* | |
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) | |
73 | */ | |
74 | #define FIRST_DEVICE_VECTOR 0x31 | |
75 | #define FIRST_SYSTEM_VECTOR 0xef /* duplicated in irq.h */ | |
76 | ||
77 | ||
78 | #ifndef __ASSEMBLY__ | |
79 | extern u8 irq_vector[NR_IRQ_VECTORS]; | |
80 | #define IO_APIC_VECTOR(irq) (irq_vector[irq]) | |
81 | #define AUTO_ASSIGN -1 | |
82 | ||
83 | /* | |
84 | * Various low-level irq details needed by irq.c, process.c, | |
85 | * time.c, io_apic.c and smp.c | |
86 | * | |
87 | * Interrupt entry/exit code at both C and assembly level | |
88 | */ | |
89 | ||
90 | extern void disable_8259A_irq(unsigned int irq); | |
91 | extern void enable_8259A_irq(unsigned int irq); | |
92 | extern int i8259A_irq_pending(unsigned int irq); | |
93 | extern void make_8259A_irq(unsigned int irq); | |
94 | extern void init_8259A(int aeoi); | |
95 | extern void FASTCALL(send_IPI_self(int vector)); | |
96 | extern void init_VISWS_APIC_irqs(void); | |
97 | extern void setup_IO_APIC(void); | |
98 | extern void disable_IO_APIC(void); | |
99 | extern void print_IO_APIC(void); | |
100 | extern int IO_APIC_get_PCI_irq_vector(int bus, int slot, int fn); | |
101 | extern void send_IPI(int dest, int vector); | |
102 | extern void setup_ioapic_dest(void); | |
103 | ||
104 | extern unsigned long io_apic_irqs; | |
105 | ||
106 | extern atomic_t irq_err_count; | |
107 | extern atomic_t irq_mis_count; | |
108 | ||
109 | #define IO_APIC_IRQ(x) (((x) >= 16) || ((1<<(x)) & io_apic_irqs)) | |
110 | ||
111 | #define __STR(x) #x | |
112 | #define STR(x) __STR(x) | |
113 | ||
114 | #include <asm/ptrace.h> | |
115 | ||
116 | #define IRQ_NAME2(nr) nr##_interrupt(void) | |
117 | #define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr) | |
118 | ||
119 | /* | |
120 | * SMP has a few special interrupts for IPI messages | |
121 | */ | |
122 | ||
123 | #define BUILD_IRQ(nr) \ | |
124 | asmlinkage void IRQ_NAME(nr); \ | |
125 | __asm__( \ | |
126 | "\n.p2align\n" \ | |
127 | "IRQ" #nr "_interrupt:\n\t" \ | |
128 | "push $" #nr "-256 ; " \ | |
129 | "jmp common_interrupt"); | |
130 | ||
131 | #if defined(CONFIG_X86_IO_APIC) | |
132 | static inline void hw_resend_irq(struct hw_interrupt_type *h, unsigned int i) { | |
133 | if (IO_APIC_IRQ(i)) | |
134 | send_IPI_self(IO_APIC_VECTOR(i)); | |
135 | } | |
136 | #else | |
137 | static inline void hw_resend_irq(struct hw_interrupt_type *h, unsigned int i) {} | |
138 | #endif | |
139 | ||
140 | #define platform_legacy_irq(irq) ((irq) < 16) | |
141 | ||
142 | #endif | |
143 | ||
144 | #endif /* _ASM_HW_IRQ_H */ |