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#ifndef _HACK_ASM_SYSTEM_H_
#define _HACK_ASM_SYSTEM_H_
#include <cthreads.h>
#include <sys/types.h>
/* This lock is held when "interrupts" are disabled. */
extern struct mutex global_interrupt_lock;
/* Save the "processor state" in the longword FLAGS. */
/* We define 1 to mean that global_interrupt_lock is held. */
#define save_flags(x) _real_save_flags (&x)
extern inline void
_real_save_flags (u_long *flagsword)
{
int locked;
locked = !mutex_try_lock (&global_interrupt_lock);
if (!locked)
mutex_unlock (&global_interrupt_lock);
*flagsword = locked;
}
/* Restore state saved in FLAGS. */
extern inline void
restore_flags (u_long flags)
{
if (flags)
mutex_try_lock (&global_interrupt_lock);
else
mutex_unlock (&global_interrupt_lock);
}
/* Prevent "interrupts" from happening. */
extern inline void
cli ()
{
mutex_try_lock (&global_interrupt_lock);
}
/* Permit "interrupts". */
extern inline void
sti ()
{
mutex_unlock (&global_interrupt_lock);
}
/* In threads set aside to be interrupt threads, they call this
before doing any real work, thus putting us into "interrupt"
mode. */
extern inline void
begin_interrupt ()
{
mutex_lock (&global_interrupt_lock);
/* Should we suspend the current "user thread"? */
}
/* And then this, at the end of the real work. */
extern inline void
end_interrupt ()
{
mutex_unlock (&global_interrupt_lock);
/* Likewise a resumption? */
}
#endif
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