/*
 * 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	7.3 (Berkeley) 02/29/92
 */

#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)	(p->p_md.md_ss_addr = 0) /* init single step */
#define	cpu_wait(p)	/* nothing */
#define cpu_setstack(p, ap) \
	(p)->p_md.md_regs[SP] = ap

/*
 * 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	0x02
#define	MIPS_R3000	0x03
#define	MIPS_R4000	0x04

/*
 * MIPS FPU types
 */
#define	MIPS_R2010	0x03
#define	MIPS_R3010	0x04
#define	MIPS_R4010	0x05

struct intr_tab {
	void	(*func)();	/* pointer to interrupt routine */
	int	unit;		/* logical unit number */
};

#ifdef KERNEL
union	cpuprid cpu;
union	cpuprid fpu;
u_int	machDataCacheSize;
u_int	machInstCacheSize;
extern	struct intr_tab intr_tab[];
#endif

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

#endif /* _CPU_H_ */