xref: /src/sys/arch/mips/include/locore.h

/* $NetBSD: locore.h,v 1.53.2.2 2002/01/10 19:46:01 thorpej Exp $ */

/*
 * Copyright 1996 The Board of Trustees of The Leland Stanford
 * Junior University. All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this
 * software and its documentation for any purpose and without
 * fee is hereby granted, provided that the above copyright
 * notice appear in all copies.  Stanford University
 * makes no representations about the suitability of this
 * software for any purpose.  It is provided "as is" without
 * express or implied warranty.
 */

/*
 * Jump table for MIPS cpu locore functions that are implemented
 * differently on different generations, or instruction-level
 * archtecture (ISA) level, the Mips family.
 *
 * We currently provide support for MIPS I and MIPS III.
 */

#ifndef _MIPS_LOCORE_H
#define  _MIPS_LOCORE_H

#ifndef _LKM
#include "opt_cputype.h"
#include "opt_mips_cache.h"
#endif

struct tlb;

/*
 * locore service routine for exception vectors. Used outside locore
 * only to print them by name in stack tracebacks
 */

u_int32_t mips_cp0_cause_read(void);
void	mips_cp0_cause_write(u_int32_t);
u_int32_t mips_cp0_status_read(void);
void	mips_cp0_status_write(u_int32_t);

void	mips1_SetPID(int);
void	mips1_TBIA(int);
void	mips1_TBIAP(int);
void	mips1_TBIS(vaddr_t);
int	mips1_TLBUpdate(u_int, u_int);
void	mips1_wbflush(void);
void	mips1_proc_trampoline(void);
void	mips1_cpu_switch_resume(void);

uint32_t tx3900_cp0_config_read(void);

void	mips3_SetPID(int);
void	mips3_TBIA(int);
void	mips3_TBIAP(int);
void	mips3_TBIS(vaddr_t);
int	mips3_TLBUpdate(u_int, u_int);
void	mips3_TLBRead(int, struct tlb *);
void	mips3_wbflush(void);
void	mips3_proc_trampoline(void);
void	mips3_cpu_switch_resume(void);

u_int32_t mips3_cp0_compare_read(void);
void	mips3_cp0_compare_write(u_int32_t);

u_int32_t mips3_cp0_config_read(void);
void	mips3_cp0_config_write(u_int32_t);

u_int32_t mips3_cp0_count_read(void);
void	mips3_cp0_count_write(u_int32_t);

u_int32_t mips3_cp0_wired_read(void);
void	mips3_cp0_wired_write(u_int32_t);

u_int64_t mips3_ld(u_int64_t *);
void	mips3_sd(u_int64_t *, u_int64_t);

/*
 * A vector with an entry for each mips-ISA-level dependent
 * locore function, and macros which jump through it.
 *
 * XXX the macro names are chosen to be compatible with the old
 * XXX Sprite coding-convention names used in 4.4bsd/pmax.
 */
typedef struct  {
	void (*setTLBpid)(int pid);
	void (*TBIAP)(int);
	void (*TBIS)(vaddr_t);
	int  (*tlbUpdate)(u_int highreg, u_int lowreg);
	void (*wbflush)(void);
} mips_locore_jumpvec_t;

/* Override writebuffer-drain method. */
void	mips_set_wbflush(void (*)(void));

/* stacktrace() -- print a stack backtrace to the console */
void	stacktrace(void);
/* logstacktrace() -- log a stack traceback to msgbuf */
void	logstacktrace(void);

/*
 * The "active" locore-fuction vector, and
 */
extern mips_locore_jumpvec_t mips_locore_jumpvec;
extern mips_locore_jumpvec_t r2000_locore_vec;
extern mips_locore_jumpvec_t r4000_locore_vec;
extern long *mips_locoresw[];

#if defined(MIPS3) && !defined(MIPS1)
#define MachSetPID		mips3_SetPID
#define MIPS_TBIAP()		mips3_TBIAP(mips_num_tlb_entries)
#define MIPS_TBIS		mips3_TBIS
#define MachTLBUpdate		mips3_TLBUpdate
#define wbflush()		mips3_wbflush()
#define proc_trampoline		mips3_proc_trampoline
#endif

#if !defined(MIPS3) && defined(MIPS1)
#define MachSetPID		mips1_SetPID
#define MIPS_TBIAP()		mips1_TBIAP(mips_num_tlb_entries)
#define MIPS_TBIS		mips1_TBIS
#define MachTLBUpdate		mips1_TLBUpdate
#define wbflush()		mips1_wbflush()
#define proc_trampoline		mips1_proc_trampoline
#endif

#if defined(MIPS3) && defined(MIPS1)
#define MachSetPID		(*(mips_locore_jumpvec.setTLBpid))
#define MIPS_TBIAP()		(*(mips_locore_jumpvec.TBIAP))(mips_num_tlb_entries)
#define MIPS_TBIS		(*(mips_locore_jumpvec.TBIS))
#define MachTLBUpdate		(*(mips_locore_jumpvec.tlbUpdate))
#define wbflush()		(*(mips_locore_jumpvec.wbflush))()
#define proc_trampoline		(mips_locoresw[1])
#endif

#define CPU_IDLE		(mips_locoresw[2])

/* cpu_switch_resume is called inside locore.S */

/*
 * CPU identification, from PRID register.
 */
typedef int mips_prid_t;

#define	MIPS_PRID_REV(x)	(((x) >>  0) & 0x00ff)
#define	MIPS_PRID_IMPL(x)	(((x) >>  8) & 0x00ff)

/* pre-MIPS32 */
#define	MIPS_PRID_RSVD(x)	(((x) >> 16) & 0xffff)
#define	MIPS_PRID_REV_MIN(x)	((MIPS_PRID_REV(x) >> 0) & 0x0f)
#define	MIPS_PRID_REV_MAJ(x)	((MIPS_PRID_REV(x) >> 4) & 0x0f)

/* MIPS32 */
#define	MIPS_PRID_CID(x)	(((x) >> 16) & 0x00ff)	/* Company ID */
#define	    MIPS_PRID_CID_PREHISTORIC	0x00	/* Not MIPS32 */
#define	    MIPS_PRID_CID_MTI		0x01	/* MIPS Technologies, Inc. */
#define	    MIPS_PRID_CID_ALCHEMY	0x03	/* Alchemy Semiconductor */
#define	    MIPS_PRID_CID_SIBYTE	0x04	/* SiByte */

#ifdef _KERNEL

/*
 * Global variables used to communicate CPU type, and parameters
 * such as cache size, from locore to higher-level code (e.g., pmap).
 */

extern mips_prid_t cpu_id;
extern mips_prid_t fpu_id;
extern int	mips_num_tlb_entries;

void mips_pagecopy(caddr_t dst, caddr_t src);
void mips_pagezero(caddr_t dst);

/*
 * trapframe argument passed to trap()
 */
struct trapframe {
	mips_reg_t tf_regs[17];
	mips_reg_t tf_ra;
	mips_reg_t tf_sr;
	mips_reg_t tf_mullo;
	mips_reg_t tf_mulhi;
	mips_reg_t tf_epc;		/* may be changed by trap() call */
	u_int32_t  tf_ppl;		/* previous priority level */
	int32_t    tf_pad;		/* for 8 byte aligned */
};

/*
 * Stack frame for kernel traps. four args passed in registers.
 * A trapframe is pointed to by the 5th arg, and a dummy sixth argument
 * is used to avoid alignment problems
 */

struct kernframe {
	register_t cf_args[4 + 1];
	register_t cf_pad;		/* (for 8 word alignment) */
	register_t cf_sp;
	register_t cf_ra;
	struct trapframe cf_frame;
};

#endif

#endif	/* _MIPS_LOCORE_H */