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55f327fa IM |
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 | |
c8558fcd | 8 | * raw_local_irq_*() functions from the lowlevel headers. |
55f327fa IM |
9 | */ |
10 | #ifndef _ASM_IRQFLAGS_H | |
11 | #define _ASM_IRQFLAGS_H | |
12 | ||
d3561b7f RR |
13 | #ifdef CONFIG_PARAVIRT |
14 | #include <asm/paravirt.h> | |
15 | #else | |
c8558fcd | 16 | #ifndef __ASSEMBLY__ |
55f327fa | 17 | |
c8558fcd IM |
18 | static inline unsigned long __raw_local_save_flags(void) |
19 | { | |
20 | unsigned long flags; | |
55f327fa | 21 | |
c8558fcd IM |
22 | __asm__ __volatile__( |
23 | "pushfl ; popl %0" | |
24 | : "=g" (flags) | |
25 | : /* no input */ | |
26 | ); | |
27 | ||
28 | return flags; | |
29 | } | |
30 | ||
c8558fcd IM |
31 | static inline void raw_local_irq_restore(unsigned long flags) |
32 | { | |
33 | __asm__ __volatile__( | |
34 | "pushl %0 ; popfl" | |
35 | : /* no output */ | |
36 | :"g" (flags) | |
37 | :"memory", "cc" | |
38 | ); | |
39 | } | |
40 | ||
41 | static inline void raw_local_irq_disable(void) | |
42 | { | |
43 | __asm__ __volatile__("cli" : : : "memory"); | |
44 | } | |
45 | ||
46 | static inline void raw_local_irq_enable(void) | |
47 | { | |
48 | __asm__ __volatile__("sti" : : : "memory"); | |
49 | } | |
50 | ||
51 | /* | |
52 | * Used in the idle loop; sti takes one instruction cycle | |
53 | * to complete: | |
54 | */ | |
55 | static inline void raw_safe_halt(void) | |
56 | { | |
57 | __asm__ __volatile__("sti; hlt" : : : "memory"); | |
58 | } | |
59 | ||
60 | /* | |
61 | * Used when interrupts are already enabled or to | |
62 | * shutdown the processor: | |
63 | */ | |
64 | static inline void halt(void) | |
65 | { | |
66 | __asm__ __volatile__("hlt": : :"memory"); | |
67 | } | |
68 | ||
c8558fcd IM |
69 | /* |
70 | * For spinlocks, etc: | |
71 | */ | |
72 | static inline unsigned long __raw_local_irq_save(void) | |
73 | { | |
74 | unsigned long flags = __raw_local_save_flags(); | |
75 | ||
76 | raw_local_irq_disable(); | |
77 | ||
78 | return flags; | |
79 | } | |
80 | ||
d3561b7f RR |
81 | #else |
82 | #define DISABLE_INTERRUPTS cli | |
83 | #define ENABLE_INTERRUPTS sti | |
84 | #define ENABLE_INTERRUPTS_SYSEXIT sti; sysexit | |
85 | #define INTERRUPT_RETURN iret | |
86 | #define GET_CR0_INTO_EAX movl %cr0, %eax | |
87 | #endif /* __ASSEMBLY__ */ | |
88 | #endif /* CONFIG_PARAVIRT */ | |
89 | ||
90 | #ifndef __ASSEMBLY__ | |
91 | #define raw_local_save_flags(flags) \ | |
92 | do { (flags) = __raw_local_save_flags(); } while (0) | |
93 | ||
c8558fcd IM |
94 | #define raw_local_irq_save(flags) \ |
95 | do { (flags) = __raw_local_irq_save(); } while (0) | |
96 | ||
d3561b7f RR |
97 | static inline int raw_irqs_disabled_flags(unsigned long flags) |
98 | { | |
99 | return !(flags & (1 << 9)); | |
100 | } | |
101 | ||
102 | static inline int raw_irqs_disabled(void) | |
103 | { | |
104 | unsigned long flags = __raw_local_save_flags(); | |
105 | ||
106 | return raw_irqs_disabled_flags(flags); | |
107 | } | |
c8558fcd | 108 | #endif /* __ASSEMBLY__ */ |
55f327fa IM |
109 | |
110 | /* | |
111 | * Do the CPU's IRQ-state tracing from assembly code. We call a | |
112 | * C function, so save all the C-clobbered registers: | |
113 | */ | |
114 | #ifdef CONFIG_TRACE_IRQFLAGS | |
115 | ||
116 | # define TRACE_IRQS_ON \ | |
117 | pushl %eax; \ | |
118 | pushl %ecx; \ | |
119 | pushl %edx; \ | |
120 | call trace_hardirqs_on; \ | |
121 | popl %edx; \ | |
122 | popl %ecx; \ | |
123 | popl %eax; | |
124 | ||
125 | # define TRACE_IRQS_OFF \ | |
126 | pushl %eax; \ | |
127 | pushl %ecx; \ | |
128 | pushl %edx; \ | |
129 | call trace_hardirqs_off; \ | |
130 | popl %edx; \ | |
131 | popl %ecx; \ | |
132 | popl %eax; | |
133 | ||
134 | #else | |
135 | # define TRACE_IRQS_ON | |
136 | # define TRACE_IRQS_OFF | |
137 | #endif | |
138 | ||
139 | #endif |