mirror of
https://github.com/torvalds/linux.git
synced 2024-11-15 08:31:55 +00:00
b4f4372f96
So that we can profile code even in a local_irq_disable() section, only write 14 (instead of 15) into the %pil register to disable IRQs. This allows PIL level 15 to serve as a pseudo NMI. Signed-off-by: David S. Miller <davem@davemloft.net>
92 lines
1.6 KiB
C
92 lines
1.6 KiB
C
/*
|
|
* include/asm/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/pil.h>
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
static inline unsigned long __raw_local_save_flags(void)
|
|
{
|
|
unsigned long flags;
|
|
|
|
__asm__ __volatile__(
|
|
"rdpr %%pil, %0"
|
|
: "=r" (flags)
|
|
);
|
|
|
|
return flags;
|
|
}
|
|
|
|
#define raw_local_save_flags(flags) \
|
|
do { (flags) = __raw_local_save_flags(); } while (0)
|
|
|
|
static inline void raw_local_irq_restore(unsigned long flags)
|
|
{
|
|
__asm__ __volatile__(
|
|
"wrpr %0, %%pil"
|
|
: /* no output */
|
|
: "r" (flags)
|
|
: "memory"
|
|
);
|
|
}
|
|
|
|
static inline void raw_local_irq_disable(void)
|
|
{
|
|
__asm__ __volatile__(
|
|
"wrpr %0, %%pil"
|
|
: /* no outputs */
|
|
: "i" (PIL_NORMAL_MAX)
|
|
: "memory"
|
|
);
|
|
}
|
|
|
|
static inline void raw_local_irq_enable(void)
|
|
{
|
|
__asm__ __volatile__(
|
|
"wrpr 0, %%pil"
|
|
: /* no outputs */
|
|
: /* no inputs */
|
|
: "memory"
|
|
);
|
|
}
|
|
|
|
static inline int raw_irqs_disabled_flags(unsigned long flags)
|
|
{
|
|
return (flags > 0);
|
|
}
|
|
|
|
static inline int raw_irqs_disabled(void)
|
|
{
|
|
unsigned long flags = __raw_local_save_flags();
|
|
|
|
return raw_irqs_disabled_flags(flags);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
#define raw_local_irq_save(flags) \
|
|
do { (flags) = __raw_local_irq_save(); } while (0)
|
|
|
|
#endif /* (__ASSEMBLY__) */
|
|
|
|
#endif /* !(_ASM_IRQFLAGS_H) */
|