1 #ifndef _ASM_HW_IRQ_H
2 #define _ASM_HW_IRQ_H
3
4 #ifndef __ASSEMBLY__
5 /*
6 * linux/include/asm/hw_irq.h
7 *
8 * (C) 1992, 1993 Linus Torvalds, (C) 1997 Ingo Molnar
9 *
10 * moved some of the old arch/i386/kernel/irq.h to here. VY
11 *
12 * IRQ/IPI changes taken from work by Thomas Radke
13 * <tomsoft@informatik.tu-chemnitz.de>
14 *
15 * hacked by Andi Kleen for x86-64.
16 *
17 * $Id: hw_irq.h,v 1.31 2003/02/18 18:35:55 ak Exp $
18 */
19
20 #include <linux/config.h>
21 #include <linux/stddef.h>
22 #include <asm/atomic.h>
23 #include <asm/irq.h>
24
25 #endif
26
27 /*
28 * IDT vectors usable for external interrupt sources start
29 * at 0x20:
30 */
31 #define FIRST_EXTERNAL_VECTOR 0x20
32
33 #define IA32_SYSCALL_VECTOR 0x80
34
35
36 /*
37 * Vectors 0x20-0x2f are used for ISA interrupts.
38 */
39
40 /*
41 * Special IRQ vectors used by the SMP architecture, 0xf0-0xff
42 *
43 * some of the following vectors are 'rare', they are merged
44 * into a single vector (CALL_FUNCTION_VECTOR) to save vector space.
45 * TLB, reschedule and local APIC vectors are performance-critical.
46 *
47 * Vectors 0xf0-0xf9 are free (reserved for future Linux use).
48 */
49 #define SPURIOUS_APIC_VECTOR 0xff
50 #define ERROR_APIC_VECTOR 0xfe
51 #define INVALIDATE_TLB_VECTOR 0xfd
52 #define RESCHEDULE_VECTOR 0xfc
53 /* 0xfa free */
54 #define CALL_FUNCTION_VECTOR 0xfb
55
56 /*
57 * Local APIC timer IRQ vector is on a different priority level,
58 * to work around the 'lost local interrupt if more than 2 IRQ
59 * sources per level' errata.
60 */
61 #define LOCAL_TIMER_VECTOR 0xef
62
63 /*
64 * First APIC vector available to drivers: (vectors 0x30-0xee)
65 * we start at 0x31 to spread out vectors evenly between priority
66 * levels. (0x80 is the syscall vector)
67 */
68 #define FIRST_DEVICE_VECTOR 0x31
69 #define FIRST_SYSTEM_VECTOR 0xef
70
71 #ifndef __ASSEMBLY__
72 extern int irq_vector[NR_IRQS];
73 #define IO_APIC_VECTOR(irq) irq_vector[irq]
74
75 /*
76 * Various low-level irq details needed by irq.c, process.c,
77 * time.c, io_apic.c and smp.c
78 *
79 * Interrupt entry/exit code at both C and assembly level
80 */
81
82 extern void mask_irq(unsigned int irq);
83 extern void unmask_irq(unsigned int irq);
84 extern void disable_8259A_irq(unsigned int irq);
85 extern void enable_8259A_irq(unsigned int irq);
86 extern int i8259A_irq_pending(unsigned int irq);
87 extern void make_8259A_irq(unsigned int irq);
88 extern void init_8259A(int aeoi);
89 extern void FASTCALL(send_IPI_self(int vector));
90 extern void init_VISWS_APIC_irqs(void);
91 extern void setup_IO_APIC(void);
92 extern void disable_IO_APIC(void);
93 extern void print_IO_APIC(void);
94 extern int IO_APIC_get_PCI_irq_vector(int bus, int slot, int fn);
95 extern void send_IPI(int dest, int vector);
96
97 extern unsigned long io_apic_irqs;
98
99 extern atomic_t irq_err_count;
100 extern atomic_t irq_mis_count;
101
102 extern char _stext, _etext;
103
104 #define IO_APIC_IRQ(x) (((x) >= 16) || ((1<<(x)) & io_apic_irqs))
105
106 #include <asm/ptrace.h>
107
108 extern void reschedule_interrupt(void);
109 extern void invalidate_interrupt(void);
110 extern void call_function_interrupt(void);
111 extern void apic_timer_interrupt(void);
112 extern void spurious_interrupt(void);
113 extern void error_interrupt(void);
114
115 #define IRQ_NAME2(nr) nr##_interrupt(void)
116 #define IRQ_NAME(nr) IRQ_NAME2(IRQ##nr)
117
118 #define BUILD_IRQ(nr) \
119 asmlinkage void IRQ_NAME(nr); \
120 __asm__( \
121 "\n"__ALIGN_STR "\n" \
122 SYMBOL_NAME_STR(IRQ) #nr "_interrupt:\n\t" \
123 "push $" #nr "-256 ; " \
124 "jmp common_interrupt");
125
126 extern unsigned long prof_cpu_mask;
127 extern unsigned int * prof_buffer;
128 extern unsigned long prof_len;
129 extern unsigned long prof_shift;
130
131 /*
132 * x86 profiling function, SMP safe. We might want to do this in
133 * assembly totally?
134 */
x86_do_profile(unsigned long eip)135 static inline void x86_do_profile (unsigned long eip)
136 {
137 if (!prof_buffer)
138 return;
139
140 /*
141 * Only measure the CPUs specified by /proc/irq/prof_cpu_mask.
142 * (default is all CPUs.)
143 */
144 if (!((1<<smp_processor_id()) & prof_cpu_mask))
145 return;
146
147 eip -= (unsigned long) &_stext;
148 eip >>= prof_shift;
149 /*
150 * Don't ignore out-of-bounds EIP values silently,
151 * put them into the last histogram slot, so if
152 * present, they will show up as a sharp peak.
153 */
154 if (eip > prof_len-1)
155 eip = prof_len-1;
156 atomic_inc((atomic_t *)&prof_buffer[eip]);
157 }
158
159 #ifdef CONFIG_SMP /*more of this file should probably be ifdefed SMP */
hw_resend_irq(struct hw_interrupt_type * h,unsigned int i)160 static inline void hw_resend_irq(struct hw_interrupt_type *h, unsigned int i) {
161 if (IO_APIC_IRQ(i))
162 send_IPI_self(IO_APIC_VECTOR(i));
163 }
164 #else
hw_resend_irq(struct hw_interrupt_type * h,unsigned int i)165 static inline void hw_resend_irq(struct hw_interrupt_type *h, unsigned int i) {}
166 #endif
167
168 #endif
169
170 #endif /* _ASM_HW_IRQ_H */
171