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Glauber de Oliveira Costa6abcd982008-01-30 13:30:33 +01001#ifndef _X86_IRQFLAGS_H_
2#define _X86_IRQFLAGS_H_
3
4#include <asm/processor-flags.h>
5
6#ifndef __ASSEMBLY__
7/*
8 * Interrupt control:
9 */
10
11static inline unsigned long native_save_fl(void)
12{
13 unsigned long flags;
14
Joe Perchescf7f7192008-03-23 01:02:30 -070015 asm volatile("# __raw_save_flags\n\t"
16 "pushf ; pop %0"
17 : "=g" (flags)
18 : /* no input */
19 : "memory");
Glauber de Oliveira Costa6abcd982008-01-30 13:30:33 +010020
21 return flags;
22}
23
24static inline void native_restore_fl(unsigned long flags)
25{
Joe Perchescf7f7192008-03-23 01:02:30 -070026 asm volatile("push %0 ; popf"
27 : /* no output */
28 :"g" (flags)
29 :"memory", "cc");
Glauber de Oliveira Costa6abcd982008-01-30 13:30:33 +010030}
31
32static inline void native_irq_disable(void)
33{
34 asm volatile("cli": : :"memory");
35}
36
37static inline void native_irq_enable(void)
38{
39 asm volatile("sti": : :"memory");
40}
41
42static inline void native_safe_halt(void)
43{
44 asm volatile("sti; hlt": : :"memory");
45}
46
47static inline void native_halt(void)
48{
49 asm volatile("hlt": : :"memory");
50}
51
52#endif
53
54#ifdef CONFIG_PARAVIRT
55#include <asm/paravirt.h>
Thomas Gleixner96a388d2007-10-11 11:20:03 +020056#else
Glauber de Oliveira Costa6abcd982008-01-30 13:30:33 +010057#ifndef __ASSEMBLY__
58
59static inline unsigned long __raw_local_save_flags(void)
60{
61 return native_save_fl();
62}
63
64static inline void raw_local_irq_restore(unsigned long flags)
65{
66 native_restore_fl(flags);
67}
68
69static inline void raw_local_irq_disable(void)
70{
71 native_irq_disable();
72}
73
74static inline void raw_local_irq_enable(void)
75{
76 native_irq_enable();
77}
78
79/*
80 * Used in the idle loop; sti takes one instruction cycle
81 * to complete:
82 */
83static inline void raw_safe_halt(void)
84{
85 native_safe_halt();
86}
87
88/*
89 * Used when interrupts are already enabled or to
90 * shutdown the processor:
91 */
92static inline void halt(void)
93{
94 native_halt();
95}
96
97/*
98 * For spinlocks, etc:
99 */
100static inline unsigned long __raw_local_irq_save(void)
101{
102 unsigned long flags = __raw_local_save_flags();
103
104 raw_local_irq_disable();
105
106 return flags;
107}
108#else
109
110#define ENABLE_INTERRUPTS(x) sti
111#define DISABLE_INTERRUPTS(x) cli
112
113#ifdef CONFIG_X86_64
114#define INTERRUPT_RETURN iretq
115#define ENABLE_INTERRUPTS_SYSCALL_RET \
116 movq %gs:pda_oldrsp, %rsp; \
117 swapgs; \
118 sysretq;
119#else
120#define INTERRUPT_RETURN iret
121#define ENABLE_INTERRUPTS_SYSCALL_RET sti; sysexit
122#define GET_CR0_INTO_EAX movl %cr0, %eax
123#endif
124
125
126#endif /* __ASSEMBLY__ */
127#endif /* CONFIG_PARAVIRT */
128
129#ifndef __ASSEMBLY__
Joe Perchescf7f7192008-03-23 01:02:30 -0700130#define raw_local_save_flags(flags) \
131 do { (flags) = __raw_local_save_flags(); } while (0)
Glauber de Oliveira Costa6abcd982008-01-30 13:30:33 +0100132
Joe Perchescf7f7192008-03-23 01:02:30 -0700133#define raw_local_irq_save(flags) \
134 do { (flags) = __raw_local_irq_save(); } while (0)
Glauber de Oliveira Costa6abcd982008-01-30 13:30:33 +0100135
136static inline int raw_irqs_disabled_flags(unsigned long flags)
137{
138 return !(flags & X86_EFLAGS_IF);
139}
140
141static inline int raw_irqs_disabled(void)
142{
143 unsigned long flags = __raw_local_save_flags();
144
145 return raw_irqs_disabled_flags(flags);
146}
147
148/*
149 * makes the traced hardirq state match with the machine state
150 *
151 * should be a rarely used function, only in places where its
152 * otherwise impossible to know the irq state, like in traps.
153 */
154static inline void trace_hardirqs_fixup_flags(unsigned long flags)
155{
156 if (raw_irqs_disabled_flags(flags))
157 trace_hardirqs_off();
158 else
159 trace_hardirqs_on();
160}
161
162static inline void trace_hardirqs_fixup(void)
163{
164 unsigned long flags = __raw_local_save_flags();
165
166 trace_hardirqs_fixup_flags(flags);
167}
168
169#else
170
171#ifdef CONFIG_X86_64
172/*
173 * Currently paravirt can't handle swapgs nicely when we
174 * don't have a stack we can rely on (such as a user space
175 * stack). So we either find a way around these or just fault
176 * and emulate if a guest tries to call swapgs directly.
177 *
178 * Either way, this is a good way to document that we don't
179 * have a reliable stack. x86_64 only.
180 */
181#define SWAPGS_UNSAFE_STACK swapgs
182#define ARCH_TRACE_IRQS_ON call trace_hardirqs_on_thunk
183#define ARCH_TRACE_IRQS_OFF call trace_hardirqs_off_thunk
184#define ARCH_LOCKDEP_SYS_EXIT call lockdep_sys_exit_thunk
185#define ARCH_LOCKDEP_SYS_EXIT_IRQ \
186 TRACE_IRQS_ON; \
187 sti; \
188 SAVE_REST; \
189 LOCKDEP_SYS_EXIT; \
190 RESTORE_REST; \
191 cli; \
192 TRACE_IRQS_OFF;
193
194#else
195#define ARCH_TRACE_IRQS_ON \
196 pushl %eax; \
197 pushl %ecx; \
198 pushl %edx; \
199 call trace_hardirqs_on; \
200 popl %edx; \
201 popl %ecx; \
202 popl %eax;
203
204#define ARCH_TRACE_IRQS_OFF \
205 pushl %eax; \
206 pushl %ecx; \
207 pushl %edx; \
208 call trace_hardirqs_off; \
209 popl %edx; \
210 popl %ecx; \
211 popl %eax;
212
213#define ARCH_LOCKDEP_SYS_EXIT \
214 pushl %eax; \
215 pushl %ecx; \
216 pushl %edx; \
217 call lockdep_sys_exit; \
218 popl %edx; \
219 popl %ecx; \
220 popl %eax;
221
222#define ARCH_LOCKDEP_SYS_EXIT_IRQ
223#endif
224
225#ifdef CONFIG_TRACE_IRQFLAGS
226# define TRACE_IRQS_ON ARCH_TRACE_IRQS_ON
227# define TRACE_IRQS_OFF ARCH_TRACE_IRQS_OFF
228#else
229# define TRACE_IRQS_ON
230# define TRACE_IRQS_OFF
231#endif
232#ifdef CONFIG_DEBUG_LOCK_ALLOC
233# define LOCKDEP_SYS_EXIT ARCH_LOCKDEP_SYS_EXIT
234# define LOCKDEP_SYS_EXIT_IRQ ARCH_LOCKDEP_SYS_EXIT_IRQ
235# else
236# define LOCKDEP_SYS_EXIT
237# define LOCKDEP_SYS_EXIT_IRQ
238# endif
239
240#endif /* __ASSEMBLY__ */
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200241#endif