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       7.5 (Berkeley) %G%
 */

#ifndef _CPU_H_
#define _CPU_H_

#include <machine/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 */

#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 and gatherstats encapsulate the previous
 * machine state in an opaque clockframe.
 */
struct clockframe {
        int     pc;     /* program counter at time of interrupt */
        int     sr;     /* status register at time of interrupt */
};

#define CLKF_USERMODE(framep)   ((framep)->sr & MACH_SR_KU_PREV)
#define CLKF_BASEPRI(framep)    \
        ((~(framep)->sr & (MACH_INT_MASK | MACH_SR_INT_ENA_PREV)) == 0)
#define CLKF_PC(framep)         ((framep)->pc)
#define CLKF_INTR(framep)       (0)

/*
 * 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 when the user profiling
 * buffer pages are invalid.  On the PMAX, request an ast to send us
 * through trap, marking the proc as needing a profiling tick.
 */
#define need_proftick(p)        { (p)->p_flag |= SOWEUPC; aston(); }

/*
 * 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_ */