diff options
Diffstat (limited to 'include/asm-x86/irqflags.h')
| -rw-r--r-- | include/asm-x86/irqflags.h | 246 |
1 files changed, 243 insertions, 3 deletions
diff --git a/include/asm-x86/irqflags.h b/include/asm-x86/irqflags.h index 1b695ff5268..92021c1ffa3 100644 --- a/include/asm-x86/irqflags.h +++ b/include/asm-x86/irqflags.h @@ -1,5 +1,245 @@ -#ifdef CONFIG_X86_32 -# include "irqflags_32.h" +#ifndef _X86_IRQFLAGS_H_ +#define _X86_IRQFLAGS_H_ + +#include <asm/processor-flags.h> + +#ifndef __ASSEMBLY__ +/* + * Interrupt control: + */ + +static inline unsigned long native_save_fl(void) +{ + unsigned long flags; + + __asm__ __volatile__( + "# __raw_save_flags\n\t" + "pushf ; pop %0" + : "=g" (flags) + : /* no input */ + : "memory" + ); + + return flags; +} + +static inline void native_restore_fl(unsigned long flags) +{ + __asm__ __volatile__( + "push %0 ; popf" + : /* no output */ + :"g" (flags) + :"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 + +#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 ENABLE_INTERRUPTS(x) sti +#define DISABLE_INTERRUPTS(x) cli + +#ifdef CONFIG_X86_64 +#define INTERRUPT_RETURN iretq +#define ENABLE_INTERRUPTS_SYSCALL_RET \ + movq %gs:pda_oldrsp, %rsp; \ + swapgs; \ + sysretq; +#else +#define INTERRUPT_RETURN iret +#define ENABLE_INTERRUPTS_SYSCALL_RET sti; sysexit +#define GET_CR0_INTO_EAX movl %cr0, %eax +#endif + + +#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); +} + +/* + * makes the traced hardirq state match with the machine state + * + * should be a rarely used function, only in places where its + * otherwise impossible to know the irq state, like in traps. + */ +static inline void trace_hardirqs_fixup_flags(unsigned long flags) +{ + if (raw_irqs_disabled_flags(flags)) + trace_hardirqs_off(); + else + trace_hardirqs_on(); +} + +static inline void trace_hardirqs_fixup(void) +{ + unsigned long flags = __raw_local_save_flags(); + + trace_hardirqs_fixup_flags(flags); +} + #else -# include "irqflags_64.h" + +#ifdef CONFIG_X86_64 +/* + * Currently paravirt can't handle swapgs nicely when we + * don't have a stack we can rely on (such as a user space + * stack). So we either find a way around these or just fault + * and emulate if a guest tries to call swapgs directly. + * + * Either way, this is a good way to document that we don't + * have a reliable stack. x86_64 only. + */ +#define SWAPGS_UNSAFE_STACK swapgs +#define ARCH_TRACE_IRQS_ON call trace_hardirqs_on_thunk +#define ARCH_TRACE_IRQS_OFF call trace_hardirqs_off_thunk +#define ARCH_LOCKDEP_SYS_EXIT call lockdep_sys_exit_thunk +#define ARCH_LOCKDEP_SYS_EXIT_IRQ \ + TRACE_IRQS_ON; \ + sti; \ + SAVE_REST; \ + LOCKDEP_SYS_EXIT; \ + RESTORE_REST; \ + cli; \ + TRACE_IRQS_OFF; + +#else +#define ARCH_TRACE_IRQS_ON \ + pushl %eax; \ + pushl %ecx; \ + pushl %edx; \ + call trace_hardirqs_on; \ + popl %edx; \ + popl %ecx; \ + popl %eax; + +#define ARCH_TRACE_IRQS_OFF \ + pushl %eax; \ + pushl %ecx; \ + pushl %edx; \ + call trace_hardirqs_off; \ + popl %edx; \ + popl %ecx; \ + popl %eax; + +#define ARCH_LOCKDEP_SYS_EXIT \ + pushl %eax; \ + pushl %ecx; \ + pushl %edx; \ + call lockdep_sys_exit; \ + popl %edx; \ + popl %ecx; \ + popl %eax; + +#define ARCH_LOCKDEP_SYS_EXIT_IRQ +#endif + +#ifdef CONFIG_TRACE_IRQFLAGS +# define TRACE_IRQS_ON ARCH_TRACE_IRQS_ON +# define TRACE_IRQS_OFF ARCH_TRACE_IRQS_OFF +#else +# define TRACE_IRQS_ON +# define TRACE_IRQS_OFF +#endif +#ifdef CONFIG_DEBUG_LOCK_ALLOC +# define LOCKDEP_SYS_EXIT ARCH_LOCKDEP_SYS_EXIT +# define LOCKDEP_SYS_EXIT_IRQ ARCH_LOCKDEP_SYS_EXIT_IRQ +# else +# define LOCKDEP_SYS_EXIT +# define LOCKDEP_SYS_EXIT_IRQ +# endif + +#endif /* __ASSEMBLY__ */ #endif |