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/* $OpenBSD: psl.h,v 1.8 1997/01/16 09:26:04 niklas Exp $ */
/* $NetBSD: psl.h,v 1.11 1996/11/30 00:33:49 is Exp $ */
#ifndef _MACHINE_PSL_H_
#define _MACHINE_PSL_H_
#include <m68k/psl.h>
#if defined(_KERNEL) && !defined(_LOCORE)
static __inline int splraise __P((int));
static __inline int splexact __P((int));
static __inline void splx __P((int));
static __inline int spllower __P((int));
static __inline int
splraise(npsl)
register int npsl;
{
register int opsl;
__asm __volatile ("clrl %0; movew sr,%0" : "&=d" (opsl) : : "cc");
if (npsl > (opsl & (PSL_S|PSL_IPL)))
__asm __volatile ("movew %0,sr" : : "di" (npsl) : "cc");
return opsl;
}
static __inline int
splexact(npsl)
register int npsl;
{
register int opsl;
__asm __volatile ("clrl %0; movew sr,%0; movew %1,sr" : "&=d" (opsl) :
"di" (npsl) : "cc");
return opsl;
}
#if !defined(IPL_REMAP_1) && !defined(IPL_REMAP_2)
static __inline void
splx(npsl)
register int npsl;
{
__asm __volatile ("movew %0,sr" : : "di" (npsl) : "cc");
}
#endif
#ifdef IPL_REMAP_1
extern int isr_exter_ipl;
extern void walk_ipls __P((int, int));
static __inline void
splx(npsl)
register int npsl;
{
/*
* XXX This is scary as hell. Actually removing this increases performance
* XXX while functionality remains. However fairness of service is altered.
* XXX Potential lower priority services gets serviced before higher ones.
*/
if ((isr_exter_ipl << 8) > (npsl & PSL_IPL))
walk_ipls(isr_exter_ipl, npsl);
__asm __volatile("movew %0,sr" : : "di" (npsl) : "cc");
}
#endif
#ifdef IPL_REMAP_2
extern int walk_ipls __P((int));
static __inline void
splx(npsl)
register int npsl;
{
/* We should maybe have a flag telling if this is needed. */
walk_ipls(npsl);
__asm __volatile("movew %0,sr" : : "di" (npsl) : "cc");
}
#endif
static __inline int
spllower(npsl)
register int npsl;
{
register int opsl;
__asm __volatile ("clrl %0; movew sr,%0" : "&=d" (opsl) : : "cc");
splx(npsl);
return opsl;
}
/*
* Shortcuts. For enhanced security use splraise instead of splexact.
*/
#define spl1() splexact(PSL_S|PSL_IPL1)
#define spl2() splexact(PSL_S|PSL_IPL2)
#define spl3() splexact(PSL_S|PSL_IPL3)
#define spl4() splexact(PSL_S|PSL_IPL4)
#define spl5() splexact(PSL_S|PSL_IPL5)
#define spl6() splexact(PSL_S|PSL_IPL6)
#define spl7() splexact(PSL_S|PSL_IPL7)
/*
* Hardware interrupt masks
*/
#define splbio() spl3()
#define splnet() spl3()
/*
* spltty hack, idea by Jason Thorpe.
* drivers which need it (at the present only drcom) raise the variable to
* spl5 (the idea being that only ser.c really wants it below 5, and ser
* and drcom will never be present at the same time).
*
* XXX ttyspl is statically initialized in drcom.c at the moment; should
* be some driver independent file.
*
* XXX should ttyspl be volatile? I think not; it is intended to be set only
* during xxx_attach() time, and will be used only later.
* -is
*/
extern u_int16_t amiga_ttyspl;
#define spltty() splexact(amiga_ttyspl)
#define splimp() spltty() /* XXX for the full story, see i386 */
#if defined(LEV6_DEFER) || defined(IPL_REMAP_1) || defined(IPL_REMAP_2)
#define splclock() spl4()
#else
#define splclock() spl6()
#endif
#define splstatclock() splclock()
/*
* Software interrupt masks
*
* NOTE: splsoftclock() is used by hardclock() to lower the priority from
* clock to softclock before it calls softclock().
*/
#define splsoftclock() spllower(PSL_S|PSL_IPL1)
#define splsoftnet() spl1()
#define splsofttty() spl1()
/*
* Miscellaneous
*/
/*
* When remapping high interrupts down we also pull down splhigh, so that
* the fast internal serial interrupt can get called allover. This is safe
* as this interrupt never goes outside of its own structures.
*/
#if defined(LEV6_DEFER) || defined(IPL_REMAP_1) || defined(IPL_REMAP_2)
#define splhigh() spl4()
#else
#define splhigh() spl7()
#endif
#define spl0() spllower(PSL_S|PSL_IPL0)
#endif /* KERNEL && !_LOCORE */
#endif /* _MACHINE_PSL_H_ */
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