1/*
2 * include/asm-i386/irqflags.h
3 *
4 * IRQ flags handling
5 *
6 * This file gets included from lowlevel asm headers too, to provide
7 * wrapped versions of the local_irq_*() APIs, based on the
8 * raw_local_irq_*() functions from the lowlevel headers.
9 */
10#ifndef _ASM_IRQFLAGS_H
11#define _ASM_IRQFLAGS_H
12#include <asm/processor-flags.h>
13
14#ifndef __ASSEMBLY__
15static inline unsigned long native_save_fl(void)
16{
17	unsigned long f;
18	asm volatile("pushfl ; popl %0":"=g" (f): /* no input */);
19	return f;
20}
21
22static inline void native_restore_fl(unsigned long f)
23{
24	asm volatile("pushl %0 ; popfl": /* no output */
25			     :"g" (f)
26			     :"memory", "cc");
27}
28
29static inline void native_irq_disable(void)
30{
31	asm volatile("cli": : :"memory");
32}
33
34static inline void native_irq_enable(void)
35{
36	asm volatile("sti": : :"memory");
37}
38
39static inline void native_safe_halt(void)
40{
41	asm volatile("sti; hlt": : :"memory");
42}
43
44static inline void native_halt(void)
45{
46	asm volatile("hlt": : :"memory");
47}
48#endif	/* __ASSEMBLY__ */
49
50#ifdef CONFIG_PARAVIRT
51#include <asm/paravirt.h>
52#else
53#ifndef __ASSEMBLY__
54
55static inline unsigned long __raw_local_save_flags(void)
56{
57	return native_save_fl();
58}
59
60static inline void raw_local_irq_restore(unsigned long flags)
61{
62	native_restore_fl(flags);
63}
64
65static inline void raw_local_irq_disable(void)
66{
67	native_irq_disable();
68}
69
70static inline void raw_local_irq_enable(void)
71{
72	native_irq_enable();
73}
74
75/*
76 * Used in the idle loop; sti takes one instruction cycle
77 * to complete:
78 */
79static inline void raw_safe_halt(void)
80{
81	native_safe_halt();
82}
83
84/*
85 * Used when interrupts are already enabled or to
86 * shutdown the processor:
87 */
88static inline void halt(void)
89{
90	native_halt();
91}
92
93/*
94 * For spinlocks, etc:
95 */
96static inline unsigned long __raw_local_irq_save(void)
97{
98	unsigned long flags = __raw_local_save_flags();
99
100	raw_local_irq_disable();
101
102	return flags;
103}
104
105#else
106#define DISABLE_INTERRUPTS(clobbers)	cli
107#define ENABLE_INTERRUPTS(clobbers)	sti
108#define ENABLE_INTERRUPTS_SYSEXIT	sti; sysexit
109#define INTERRUPT_RETURN		iret
110#define GET_CR0_INTO_EAX		movl %cr0, %eax
111#endif /* __ASSEMBLY__ */
112#endif /* CONFIG_PARAVIRT */
113
114#ifndef __ASSEMBLY__
115#define raw_local_save_flags(flags) \
116		do { (flags) = __raw_local_save_flags(); } while (0)
117
118#define raw_local_irq_save(flags) \
119		do { (flags) = __raw_local_irq_save(); } while (0)
120
121static inline int raw_irqs_disabled_flags(unsigned long flags)
122{
123	return !(flags & X86_EFLAGS_IF);
124}
125
126static inline int raw_irqs_disabled(void)
127{
128	unsigned long flags = __raw_local_save_flags();
129
130	return raw_irqs_disabled_flags(flags);
131}
132
133/*
134 * makes the traced hardirq state match with the machine state
135 *
136 * should be a rarely used function, only in places where its
137 * otherwise impossible to know the irq state, like in traps.
138 */
139static inline void trace_hardirqs_fixup_flags(unsigned long flags)
140{
141	if (raw_irqs_disabled_flags(flags))
142		trace_hardirqs_off();
143	else
144		trace_hardirqs_on();
145}
146
147static inline void trace_hardirqs_fixup(void)
148{
149	unsigned long flags = __raw_local_save_flags();
150
151	trace_hardirqs_fixup_flags(flags);
152}
153#endif /* __ASSEMBLY__ */
154
155/*
156 * Do the CPU's IRQ-state tracing from assembly code. We call a
157 * C function, so save all the C-clobbered registers:
158 */
159#ifdef CONFIG_TRACE_IRQFLAGS
160
161# define TRACE_IRQS_ON				\
162	pushl %eax;				\
163	pushl %ecx;				\
164	pushl %edx;				\
165	call trace_hardirqs_on;			\
166	popl %edx;				\
167	popl %ecx;				\
168	popl %eax;
169
170# define TRACE_IRQS_OFF				\
171	pushl %eax;				\
172	pushl %ecx;				\
173	pushl %edx;				\
174	call trace_hardirqs_off;		\
175	popl %edx;				\
176	popl %ecx;				\
177	popl %eax;
178
179#else
180# define TRACE_IRQS_ON
181# define TRACE_IRQS_OFF
182#endif
183
184#ifdef CONFIG_DEBUG_LOCK_ALLOC
185# define LOCKDEP_SYS_EXIT			\
186	pushl %eax;				\
187	pushl %ecx;				\
188	pushl %edx;				\
189	call lockdep_sys_exit;			\
190	popl %edx;				\
191	popl %ecx;				\
192	popl %eax;
193#else
194# define LOCKDEP_SYS_EXIT
195#endif
196
197#endif
198