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6abcd98f GOC |
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 | ||
11 | static inline unsigned long native_save_fl(void) | |
12 | { | |
13 | unsigned long flags; | |
14 | ||
f1f029c7 | 15 | /* |
ab94fcf5 PA |
16 | * "=rm" is safe here, because "pop" adjusts the stack before |
17 | * it evaluates its effective address -- this is part of the | |
18 | * documented behavior of the "pop" instruction. | |
f1f029c7 | 19 | */ |
cf7f7191 JP |
20 | asm volatile("# __raw_save_flags\n\t" |
21 | "pushf ; pop %0" | |
ab94fcf5 | 22 | : "=rm" (flags) |
cf7f7191 JP |
23 | : /* no input */ |
24 | : "memory"); | |
6abcd98f GOC |
25 | |
26 | return flags; | |
27 | } | |
28 | ||
29 | static inline void native_restore_fl(unsigned long flags) | |
30 | { | |
cf7f7191 JP |
31 | asm volatile("push %0 ; popf" |
32 | : /* no output */ | |
33 | :"g" (flags) | |
34 | :"memory", "cc"); | |
6abcd98f GOC |
35 | } |
36 | ||
37 | static inline void native_irq_disable(void) | |
38 | { | |
39 | asm volatile("cli": : :"memory"); | |
40 | } | |
41 | ||
42 | static inline void native_irq_enable(void) | |
43 | { | |
44 | asm volatile("sti": : :"memory"); | |
45 | } | |
46 | ||
47 | static inline void native_safe_halt(void) | |
48 | { | |
49 | asm volatile("sti; hlt": : :"memory"); | |
50 | } | |
51 | ||
52 | static inline void native_halt(void) | |
53 | { | |
54 | asm volatile("hlt": : :"memory"); | |
55 | } | |
56 | ||
57 | #endif | |
58 | ||
59 | #ifdef CONFIG_PARAVIRT | |
60 | #include <asm/paravirt.h> | |
61 | #else | |
62 | #ifndef __ASSEMBLY__ | |
e08fbb78 | 63 | #include <linux/types.h> |
6abcd98f | 64 | |
e08fbb78 | 65 | static inline notrace unsigned long arch_local_save_flags(void) |
6abcd98f GOC |
66 | { |
67 | return native_save_fl(); | |
68 | } | |
69 | ||
e08fbb78 | 70 | static inline notrace void arch_local_irq_restore(unsigned long flags) |
6abcd98f GOC |
71 | { |
72 | native_restore_fl(flags); | |
73 | } | |
74 | ||
e08fbb78 | 75 | static inline notrace void arch_local_irq_disable(void) |
6abcd98f GOC |
76 | { |
77 | native_irq_disable(); | |
78 | } | |
79 | ||
e08fbb78 | 80 | static inline notrace void arch_local_irq_enable(void) |
6abcd98f GOC |
81 | { |
82 | native_irq_enable(); | |
83 | } | |
84 | ||
85 | /* | |
86 | * Used in the idle loop; sti takes one instruction cycle | |
87 | * to complete: | |
88 | */ | |
df9ee292 | 89 | static inline void arch_safe_halt(void) |
6abcd98f GOC |
90 | { |
91 | native_safe_halt(); | |
92 | } | |
93 | ||
94 | /* | |
95 | * Used when interrupts are already enabled or to | |
96 | * shutdown the processor: | |
97 | */ | |
98 | static inline void halt(void) | |
99 | { | |
100 | native_halt(); | |
101 | } | |
102 | ||
103 | /* | |
104 | * For spinlocks, etc: | |
105 | */ | |
e08fbb78 | 106 | static inline notrace unsigned long arch_local_irq_save(void) |
6abcd98f | 107 | { |
df9ee292 DH |
108 | unsigned long flags = arch_local_save_flags(); |
109 | arch_local_irq_disable(); | |
6abcd98f GOC |
110 | return flags; |
111 | } | |
112 | #else | |
113 | ||
114 | #define ENABLE_INTERRUPTS(x) sti | |
115 | #define DISABLE_INTERRUPTS(x) cli | |
116 | ||
117 | #ifdef CONFIG_X86_64 | |
df366e98 JF |
118 | #define SWAPGS swapgs |
119 | /* | |
120 | * Currently paravirt can't handle swapgs nicely when we | |
121 | * don't have a stack we can rely on (such as a user space | |
122 | * stack). So we either find a way around these or just fault | |
123 | * and emulate if a guest tries to call swapgs directly. | |
124 | * | |
125 | * Either way, this is a good way to document that we don't | |
126 | * have a reliable stack. x86_64 only. | |
127 | */ | |
a00394f8 | 128 | #define SWAPGS_UNSAFE_STACK swapgs |
df366e98 JF |
129 | |
130 | #define PARAVIRT_ADJUST_EXCEPTION_FRAME /* */ | |
131 | ||
6abcd98f | 132 | #define INTERRUPT_RETURN iretq |
2be29982 JF |
133 | #define USERGS_SYSRET64 \ |
134 | swapgs; \ | |
135 | sysretq; | |
136 | #define USERGS_SYSRET32 \ | |
137 | swapgs; \ | |
138 | sysretl | |
139 | #define ENABLE_INTERRUPTS_SYSEXIT32 \ | |
140 | swapgs; \ | |
141 | sti; \ | |
142 | sysexit | |
143 | ||
6abcd98f GOC |
144 | #else |
145 | #define INTERRUPT_RETURN iret | |
d75cd22f | 146 | #define ENABLE_INTERRUPTS_SYSEXIT sti; sysexit |
6abcd98f GOC |
147 | #define GET_CR0_INTO_EAX movl %cr0, %eax |
148 | #endif | |
149 | ||
150 | ||
151 | #endif /* __ASSEMBLY__ */ | |
152 | #endif /* CONFIG_PARAVIRT */ | |
153 | ||
154 | #ifndef __ASSEMBLY__ | |
df9ee292 | 155 | static inline int arch_irqs_disabled_flags(unsigned long flags) |
6abcd98f GOC |
156 | { |
157 | return !(flags & X86_EFLAGS_IF); | |
158 | } | |
159 | ||
df9ee292 | 160 | static inline int arch_irqs_disabled(void) |
6abcd98f | 161 | { |
df9ee292 | 162 | unsigned long flags = arch_local_save_flags(); |
6abcd98f | 163 | |
df9ee292 | 164 | return arch_irqs_disabled_flags(flags); |
6abcd98f GOC |
165 | } |
166 | ||
96a388de | 167 | #else |
6abcd98f GOC |
168 | |
169 | #ifdef CONFIG_X86_64 | |
6abcd98f GOC |
170 | #define ARCH_LOCKDEP_SYS_EXIT call lockdep_sys_exit_thunk |
171 | #define ARCH_LOCKDEP_SYS_EXIT_IRQ \ | |
172 | TRACE_IRQS_ON; \ | |
173 | sti; \ | |
174 | SAVE_REST; \ | |
175 | LOCKDEP_SYS_EXIT; \ | |
176 | RESTORE_REST; \ | |
177 | cli; \ | |
178 | TRACE_IRQS_OFF; | |
179 | ||
180 | #else | |
6abcd98f GOC |
181 | #define ARCH_LOCKDEP_SYS_EXIT \ |
182 | pushl %eax; \ | |
183 | pushl %ecx; \ | |
184 | pushl %edx; \ | |
185 | call lockdep_sys_exit; \ | |
186 | popl %edx; \ | |
187 | popl %ecx; \ | |
188 | popl %eax; | |
189 | ||
190 | #define ARCH_LOCKDEP_SYS_EXIT_IRQ | |
191 | #endif | |
192 | ||
193 | #ifdef CONFIG_TRACE_IRQFLAGS | |
81d68a96 SR |
194 | # define TRACE_IRQS_ON call trace_hardirqs_on_thunk; |
195 | # define TRACE_IRQS_OFF call trace_hardirqs_off_thunk; | |
6abcd98f GOC |
196 | #else |
197 | # define TRACE_IRQS_ON | |
198 | # define TRACE_IRQS_OFF | |
199 | #endif | |
200 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
201 | # define LOCKDEP_SYS_EXIT ARCH_LOCKDEP_SYS_EXIT | |
202 | # define LOCKDEP_SYS_EXIT_IRQ ARCH_LOCKDEP_SYS_EXIT_IRQ | |
203 | # else | |
204 | # define LOCKDEP_SYS_EXIT | |
205 | # define LOCKDEP_SYS_EXIT_IRQ | |
206 | # endif | |
207 | ||
208 | #endif /* __ASSEMBLY__ */ | |
96a388de | 209 | #endif |