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-rw-r--r--arch/x86/include/asm/irqflags.h211
1 files changed, 211 insertions, 0 deletions
diff --git a/arch/x86/include/asm/irqflags.h b/arch/x86/include/asm/irqflags.h
new file mode 100644
index 000000000000..2bdab21f0898
--- /dev/null
+++ b/arch/x86/include/asm/irqflags.h
@@ -0,0 +1,211 @@
1#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
15 asm volatile("# __raw_save_flags\n\t"
16 "pushf ; pop %0"
17 : "=g" (flags)
18 : /* no input */
19 : "memory");
20
21 return flags;
22}
23
24static inline void native_restore_fl(unsigned long flags)
25{
26 asm volatile("push %0 ; popf"
27 : /* no output */
28 :"g" (flags)
29 :"memory", "cc");
30}
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>
56#else
57#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 SWAPGS swapgs
115/*
116 * Currently paravirt can't handle swapgs nicely when we
117 * don't have a stack we can rely on (such as a user space
118 * stack). So we either find a way around these or just fault
119 * and emulate if a guest tries to call swapgs directly.
120 *
121 * Either way, this is a good way to document that we don't
122 * have a reliable stack. x86_64 only.
123 */
124#define SWAPGS_UNSAFE_STACK swapgs
125
126#define PARAVIRT_ADJUST_EXCEPTION_FRAME /* */
127
128#define INTERRUPT_RETURN iretq
129#define USERGS_SYSRET64 \
130 swapgs; \
131 sysretq;
132#define USERGS_SYSRET32 \
133 swapgs; \
134 sysretl
135#define ENABLE_INTERRUPTS_SYSEXIT32 \
136 swapgs; \
137 sti; \
138 sysexit
139
140#else
141#define INTERRUPT_RETURN iret
142#define ENABLE_INTERRUPTS_SYSEXIT sti; sysexit
143#define GET_CR0_INTO_EAX movl %cr0, %eax
144#endif
145
146
147#endif /* __ASSEMBLY__ */
148#endif /* CONFIG_PARAVIRT */
149
150#ifndef __ASSEMBLY__
151#define raw_local_save_flags(flags) \
152 do { (flags) = __raw_local_save_flags(); } while (0)
153
154#define raw_local_irq_save(flags) \
155 do { (flags) = __raw_local_irq_save(); } while (0)
156
157static inline int raw_irqs_disabled_flags(unsigned long flags)
158{
159 return !(flags & X86_EFLAGS_IF);
160}
161
162static inline int raw_irqs_disabled(void)
163{
164 unsigned long flags = __raw_local_save_flags();
165
166 return raw_irqs_disabled_flags(flags);
167}
168
169#else
170
171#ifdef CONFIG_X86_64
172#define ARCH_LOCKDEP_SYS_EXIT call lockdep_sys_exit_thunk
173#define ARCH_LOCKDEP_SYS_EXIT_IRQ \
174 TRACE_IRQS_ON; \
175 sti; \
176 SAVE_REST; \
177 LOCKDEP_SYS_EXIT; \
178 RESTORE_REST; \
179 cli; \
180 TRACE_IRQS_OFF;
181
182#else
183#define ARCH_LOCKDEP_SYS_EXIT \
184 pushl %eax; \
185 pushl %ecx; \
186 pushl %edx; \
187 call lockdep_sys_exit; \
188 popl %edx; \
189 popl %ecx; \
190 popl %eax;
191
192#define ARCH_LOCKDEP_SYS_EXIT_IRQ
193#endif
194
195#ifdef CONFIG_TRACE_IRQFLAGS
196# define TRACE_IRQS_ON call trace_hardirqs_on_thunk;
197# define TRACE_IRQS_OFF call trace_hardirqs_off_thunk;
198#else
199# define TRACE_IRQS_ON
200# define TRACE_IRQS_OFF
201#endif
202#ifdef CONFIG_DEBUG_LOCK_ALLOC
203# define LOCKDEP_SYS_EXIT ARCH_LOCKDEP_SYS_EXIT
204# define LOCKDEP_SYS_EXIT_IRQ ARCH_LOCKDEP_SYS_EXIT_IRQ
205# else
206# define LOCKDEP_SYS_EXIT
207# define LOCKDEP_SYS_EXIT_IRQ
208# endif
209
210#endif /* __ASSEMBLY__ */
211#endif