contributed by Ralph Campbell

[unix-history] / usr / src / sys / pmax / include / cpu.h

/*
* Copyright (c) 1992 Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ralph Campbell.
*
* %sccs.include.redist.c%
*
*      @(#)cpu.h       7.1 (Berkeley) %G%
*/

#ifndef _CPU_H_
#define _CPU_H_

#include "machConst.h"

/*
* Exported definitions unique to pmax/mips cpu support.
*/

/*
* definitions of cpu-dependent requirements
* referenced in generic code
*/
#undef  COPY_SIGCODE            /* copy sigcode above user stack in exec */

/*
* function vs. inline configuration;
* these are defined to get generic functions
* rather than inline or machine-dependent implementations
*/
#define NEED_MINMAX             /* need {,i,l,ul}{min,max} functions */
#undef  NEED_FFS                /* don't need ffs function */
#undef  NEED_BCMP               /* don't need bcmp function */
#undef  NEED_STRLEN             /* don't need strlen function */

#define cpu_exec(p)     /* nothing */
#define cpu_wait(p)     /* nothing */

/*
* Arguments to hardclock, softclock and gatherstats
* encapsulate the previous machine state in an opaque
* clockframe;
*/
typedef struct intrframe {
       int     pc;
       int     ps;
} clockframe;

#define CLKF_USERMODE(framep)   ((framep)->ps & MACH_SR_KU_PREV)
#define CLKF_BASEPRI(framep)    \
       (((framep)->ps & (MACH_INT_MASK | MACH_SR_INT_ENA_PREV)) == \
       (MACH_INT_MASK | MACH_SR_INT_ENA_PREV))
#define CLKF_PC(framep)         ((framep)->pc)

/*
* Preempt the current process if in interrupt from user mode,
* or after the current trap/syscall if in system mode.
*/
#define need_resched()  { want_resched = 1; aston(); }

/*
* Give a profiling tick to the current process from the softclock
* interrupt.
*/
#define profile_tick(p, framep) \
       addupc((framep)->pc, &p->p_stats->p_prof, 1);

/*
* Notify the current process (p) that it has a signal pending,
* process as soon as possible.
*/
#define signotify(p)    aston()

#define aston()         (astpending = 1)

int     astpending;     /* need to trap before returning to user mode */
int     want_resched;   /* resched() was called */

/*
* CPU identification, from PRID register.
*/
union cpuprid {
       int     cpuprid;
       struct {
#if BYTE_ORDER == BIG_ENDIAN
               u_int   pad1:16;        /* reserved */
               u_int   cp_imp:8;       /* implementation identifier */
               u_int   cp_majrev:4;    /* major revision identifier */
               u_int   cp_minrev:4;    /* minor revision identifier */
#else
               u_int   cp_minrev:4;    /* minor revision identifier */
               u_int   cp_majrev:4;    /* major revision identifier */
               u_int   cp_imp:8;       /* implementation identifier */
               u_int   pad1:16;        /* reserved */
#endif
       } cpu;
};

/*
* MIPS CPU types (cp_imp).
*/
#define MIPS_R2000      2

/*
* MIPS FPU types
*/
#define MIPS_R2010      3

#ifdef KERNEL
union   cpuprid cpu;
union   cpuprid fpu;
u_int   machDataCacheSize;
u_int   machInstCacheSize;
#endif

/*
* Enable realtime clock (always enabled).
*/
#define enablertclock()

#endif /* _CPU_H_ */