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

/*	$NetBSD: locore.h,v 1.30 2000/04/12 01:05:34 nisimura 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.
 * The following functions must be provided for each mips ISA level:
 *
 *
 *	MachFlushCache
 *	MachFlushDCache
 *	MachFlushICache
 *	MachForceCacheUpdate
 *	MachSetPID
 *	MachTLBFlush
 *	MachTLBFlushAddr
 *	MachTLBUpdate
 *	wbflush
 *	proc_trampoline()
 *	cpu_switch_resume()
 *
 * We currently provide support for:
 *
 *	r2000 and r3000 (mips ISA-I)
 *	r4000 and r4400 in 32-bit mode (mips ISA-III?)
 */

#ifndef _MIPS_LOCORE_H
#define  _MIPS_LOCORE_H

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

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

u_int32_t mips_read_causereg __P((void));
u_int32_t mips_read_statusreg __P((void));
void mips_idle __P((void));

void mips1_ConfigCache  __P((void));
void mips1_FlushCache  __P((void));
void mips1_FlushDCache  __P((vaddr_t addr, vsize_t len));
void mips1_FlushICache  __P((vaddr_t addr, vsize_t len));
void mips1_ForceCacheUpdate __P((void));

void mips1_SetPID   __P((int pid));
void mips1_TBIA __P((int));
void mips1_TBIAP __P((int));
void mips1_TBIS __P((vaddr_t));
int mips1_TLBUpdate __P((u_int, /*pt_entry_t*/ u_int));

void mips1_wbflush __P((void));
void mips1_proc_trampoline __P((void));
void mips1_cpu_switch_resume __P((void));

void mips3_ConfigCache __P((void));
void mips3_FlushCache  __P((void));
void mips3_FlushDCache __P((vaddr_t addr, vaddr_t len));
void mips3_FlushICache __P((vaddr_t addr, vaddr_t len));
void mips3_ForceCacheUpdate __P((void));
void mips3_HitFlushDCache __P((vaddr_t, int));

void mips3_SetPID  __P((int pid));
void mips3_TBIA __P((int));
void mips3_TBIAP __P((int));
void mips3_TBIS __P((vaddr_t));
int mips3_TLBUpdate __P((u_int, /*pt_entry_t*/ u_int));
struct tlb;
void mips3_TLBRead __P((int, struct tlb *));
#if 0
void mips3_TLBWriteIndexedVPS __P((u_int index, struct tlb *tlb));
void mips3_TLBWriteIndexed __P((u_int index, u_int high,
				u_int lo0, u_int lo1));
#endif
void mips3_SetWIRED __P((int));
void mips3_wbflush __P((void));
void mips3_proc_trampoline __P((void));
void mips3_cpu_switch_resume __P((void));

void mips5200_FlushCache  __P((void));
void mips5200_FlushDCache __P((vaddr_t addr, vaddr_t len));
void mips5200_HitFlushDCache __P((vaddr_t, int));
void mips5200_FlushICache __P((vaddr_t addr, vaddr_t len));

u_int32_t mips3_cycle_count __P((void));
u_int32_t mips3_write_count __P((u_int32_t));
u_int32_t mips3_read_compare __P((void));
u_int32_t mips3_read_config __P((void));
void mips3_write_compare __P((u_int32_t));
void mips3_write_xcontext_upper __P((u_int32_t));
void mips3_clearBEV __P((void));

/*
 *  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
 * Sprite  coding-convention names used in 4.4bsd/pmax.
 */
typedef struct  {
	void (*flushCache)  __P((void));
	void (*flushDCache) __P((vaddr_t addr, vsize_t len));
	void (*flushICache) __P((vaddr_t addr, vsize_t len));
	void (*forceCacheUpdate)  __P((void));
	void (*setTLBpid)  __P((int pid));
	void (*tlbFlush)  __P((int numtlb));
	void (*tlbFlushAddr)  __P((vaddr_t)); /* XXX Really pte highpart ? */
	int (*tlbUpdate)  __P((u_int highreg, u_int lowreg));
	void (*wbflush) __P((void));
	void (*proc_trampoline) __P((void));
	void (*cpu_switch_resume) __P((void));
	void (*cpu_idle) __P((void));
} mips_locore_jumpvec_t;

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


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

#if defined(MIPS3) && !defined (MIPS1)
#if	defined(MIPS3_L2CACHE_ABSENT) && defined(MIPS3_5200)
#define MachFlushCache		mips5200_FlushCache
#define MachFlushDCache		mips5200_FlushDCache
#define MachHitFlushDCache	mips5200_HitFlushDCache
#define MachFlushICache		mips5200_FlushICache
#else
#define MachFlushCache		mips3_FlushCache
#if	defined(MIPS3_L2CACHE_ABSENT) && defined(MIPS3_4100)
#define MachFlushDCache         mips3_FlushDCache		/* VR4100 */
#elif	!defined(MIPS3_L2CACHE_ABSENT) && defined(MIPS3_L2CACHE_PRESENT)
#define MachFlushDCache		mips3_FlushDCache
#else
#define MachFlushDCache		(*(mips_locore_jumpvec.flushDCache))
#endif
#define MachHitFlushDCache	mips3_HitFlushDCache
#define MachFlushICache		mips3_FlushICache
#endif
#define MachForceCacheUpdate	mips3_ForceCacheUpdate
#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 MachFlushCache		mips1_FlushCache
#define MachFlushDCache		mips1_FlushDCache
#define MachFlushICache		mips1_FlushICache
#define MachForceCacheUpdate	mips1_ForceCacheUpdate
#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 MachFlushCache		(*(mips_locore_jumpvec.flushCache))
#define MachFlushDCache		(*(mips_locore_jumpvec.flushDCache))
#define MachFlushICache		(*(mips_locore_jumpvec.flushICache))
#define MachForceCacheUpdate	(*(mips_locore_jumpvec.forceCacheUpdate))
#define MachSetPID		(*(mips_locore_jumpvec.setTLBpid))
#define MIPS_TBIAP()		(*(mips_locore_jumpvec.tlbFlush))(mips_num_tlb_entries)
#define MIPS_TBIS		(*(mips_locore_jumpvec.tlbFlushAddr))
#define MachTLBUpdate		(*(mips_locore_jumpvec.tlbUpdate))
#define wbflush()		(*(mips_locore_jumpvec.wbflush))()
#define proc_trampoline		(mips_locore_jumpvec.proc_trampoline)
#define MachHitFlushDCache	mips3_HitFlushDCache
#endif

/* cpu_switch_resume is called inside locore.S */

/*
 * 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;
};


#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 union	cpuprid cpu_id;
extern union	cpuprid fpu_id;
extern int	cpu_arch;
extern int	mips_num_tlb_entries;
extern u_int	mips_L1DCacheSize;
extern u_int	mips_L1ICacheSize;
extern u_int	mips_L1DCacheLSize;
extern u_int	mips_L1ICacheLSize;
extern int	mips_L2CachePresent;
extern u_int	mips_L2CacheLSize;
extern u_int	mips_CacheAliasMask;

#ifdef MIPS3
extern int	mips3_L1TwoWayCache;
extern int	mips3_cacheflush_bug;
#endif /* MIPS3 */

/*
 * 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 */
};

/*
 * 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 */