/* * include/asm-i386/irqflags.h * * IRQ flags handling * * This file gets included from lowlevel asm headers too, to provide * wrapped versions of the local_irq_*() APIs, based on the * raw_local_irq_*() functions from the lowlevel headers. */ #ifndef _ASM_IRQFLAGS_H #define _ASM_IRQFLAGS_H #include <asm/processor-flags.h> #ifndef __ASSEMBLY__ static inline unsigned long native_save_fl(void) { unsigned long f; asm volatile("pushfl ; popl %0":"=g" (f): /* no input */); return f; } static inline void native_restore_fl(unsigned long f) { asm volatile("pushl %0 ; popfl": /* no output */ :"g" (f) :"memory", "cc"); } static inline void native_irq_disable(void) { asm volatile("cli": : :"memory"); } static inline void native_irq_enable(void) { asm volatile("sti": : :"memory"); } static inline void native_safe_halt(void) { asm volatile("sti; hlt": : :"memory"); } static inline void native_halt(void) { asm volatile("hlt": : :"memory"); } #endif /* __ASSEMBLY__ */ #ifdef CONFIG_PARAVIRT #include <asm/paravirt.h> #else #ifndef __ASSEMBLY__ static inline unsigned long __raw_local_save_flags(void) { return native_save_fl(); } static inline void raw_local_irq_restore(unsigned long flags) { native_restore_fl(flags); } static inline void raw_local_irq_disable(void) { native_irq_disable(); } static inline void raw_local_irq_enable(void) { native_irq_enable(); } /* * Used in the idle loop; sti takes one instruction cycle * to complete: */ static inline void raw_safe_halt(void) { native_safe_halt(); } /* * Used when interrupts are already enabled or to * shutdown the processor: */ static inline void halt(void) { native_halt(); } /* * For spinlocks, etc: */ static inline unsigned long __raw_local_irq_save(void) { unsigned long flags = __raw_local_save_flags(); raw_local_irq_disable(); return flags; } #else #define DISABLE_INTERRUPTS(clobbers) cli #define ENABLE_INTERRUPTS(clobbers) sti #define ENABLE_INTERRUPTS_SYSEXIT sti; sysexit #define INTERRUPT_RETURN iret #define GET_CR0_INTO_EAX movl %cr0, %eax #endif /* __ASSEMBLY__ */ #endif /* CONFIG_PARAVIRT */ #ifndef __ASSEMBLY__ #define raw_local_save_flags(flags) \ do { (flags) = __raw_local_save_flags(); } while (0) #define raw_local_irq_save(flags) \ do { (flags) = __raw_local_irq_save(); } while (0) static inline int raw_irqs_disabled_flags(unsigned long flags) { return !(flags & X86_EFLAGS_IF); } static inline int raw_irqs_disabled(void) { unsigned long flags = __raw_local_save_flags(); return raw_irqs_disabled_flags(flags); } #endif /* __ASSEMBLY__ */ /* * Do the CPU's IRQ-state tracing from assembly code. We call a * C function, so save all the C-clobbered registers: */ #ifdef CONFIG_TRACE_IRQFLAGS # define TRACE_IRQS_ON \ pushl %eax; \ pushl %ecx; \ pushl %edx; \ call trace_hardirqs_on; \ popl %edx; \ popl %ecx; \ popl %eax; # define TRACE_IRQS_OFF \ pushl %eax; \ pushl %ecx; \ pushl %edx; \ call trace_hardirqs_off; \ popl %edx; \ popl %ecx; \ popl %eax; #else # define TRACE_IRQS_ON # define TRACE_IRQS_OFF #endif #ifdef CONFIG_DEBUG_LOCK_ALLOC # define LOCKDEP_SYS_EXIT \ pushl %eax; \ pushl %ecx; \ pushl %edx; \ call lockdep_sys_exit; \ popl %edx; \ popl %ecx; \ popl %eax; #else # define LOCKDEP_SYS_EXIT #endif #endif