![Ingo Molnar](/assets/img/avatar_default.png)
Conflicts: arch/x86/kernel/entry_32.S arch/x86/kernel/process_32.c arch/x86/kernel/process_64.c arch/x86/lib/Makefile include/asm-x86/irqflags.h kernel/Makefile kernel/sched.c Signed-off-by: Ingo Molnar <mingo@elte.hu>
233 lines
4.4 KiB
C
233 lines
4.4 KiB
C
#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 SWAPGS swapgs
|
|
/*
|
|
* 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 PARAVIRT_ADJUST_EXCEPTION_FRAME /* */
|
|
|
|
#define INTERRUPT_RETURN iretq
|
|
#define USERGS_SYSRET64 \
|
|
swapgs; \
|
|
sysretq;
|
|
#define USERGS_SYSRET32 \
|
|
swapgs; \
|
|
sysretl
|
|
#define ENABLE_INTERRUPTS_SYSEXIT32 \
|
|
swapgs; \
|
|
sti; \
|
|
sysexit
|
|
|
|
#else
|
|
#define INTERRUPT_RETURN iret
|
|
#define ENABLE_INTERRUPTS_SYSEXIT 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
|
|
|
|
#ifdef CONFIG_X86_64
|
|
#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_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 call trace_hardirqs_on_thunk;
|
|
# define TRACE_IRQS_OFF call trace_hardirqs_off_thunk;
|
|
#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
|