arch_int.h revision 1c1efa6f
1/*
2 * Copyright 2005-2009, Axel D��rfler, axeld@pinc-software.de.
3 * Copyright 2012, Alex Smith, alex@alex-smith.me.uk.
4 * Distributed under the terms of the MIT License.
5 */
6#ifndef _KERNEL_ARCH_x86_INT_H
7#define _KERNEL_ARCH_x86_INT_H
8
9
10#define ARCH_INTERRUPT_BASE	0x20
11#define NUM_IO_VECTORS		(256 - ARCH_INTERRUPT_BASE)
12
13
14enum irq_source {
15	IRQ_SOURCE_INVALID,
16	IRQ_SOURCE_IOAPIC,
17	IRQ_SOURCE_MSI,
18};
19
20
21static inline void
22arch_int_enable_interrupts_inline(void)
23{
24	asm volatile("sti");
25}
26
27
28static inline int
29arch_int_disable_interrupts_inline(void)
30{
31	size_t flags;
32
33	asm volatile("pushf;\n"
34		"pop %0;\n"
35		"cli" : "=g" (flags));
36	return (flags & 0x200) != 0;
37}
38
39
40static inline void
41arch_int_restore_interrupts_inline(int oldState)
42{
43	if (oldState)
44		asm volatile("sti");
45}
46
47
48static inline bool
49arch_int_are_interrupts_enabled_inline(void)
50{
51	size_t flags;
52
53	asm volatile("pushf;\n"
54		"pop %0;\n" : "=g" (flags));
55	return (flags & 0x200) != 0;
56}
57
58
59// map the functions to the inline versions
60#define arch_int_enable_interrupts()	arch_int_enable_interrupts_inline()
61#define arch_int_disable_interrupts()	arch_int_disable_interrupts_inline()
62#define arch_int_restore_interrupts(status)	\
63	arch_int_restore_interrupts_inline(status)
64#define arch_int_are_interrupts_enabled()	\
65	arch_int_are_interrupts_enabled_inline()
66
67
68#ifdef __cplusplus
69
70typedef struct interrupt_controller_s {
71	const char *name;
72	void	(*enable_io_interrupt)(int32 num);
73	void	(*disable_io_interrupt)(int32 num);
74	void	(*configure_io_interrupt)(int32 num, uint32 config);
75	bool	(*is_spurious_interrupt)(int32 num);
76	bool	(*is_level_triggered_interrupt)(int32 num);
77	bool	(*end_of_interrupt)(int32 num);
78	void	(*assign_interrupt_to_cpu)(int32 num, int32 cpu);
79} interrupt_controller;
80
81
82void x86_set_irq_source(int irq, irq_source source);
83
84void arch_int_set_interrupt_controller(const interrupt_controller &controller);
85
86#endif // __cplusplus
87
88#endif /* _KERNEL_ARCH_x86_INT_H */
89