/*	$NetBSD: pte.h,v 1.24 2017/05/22 17:12:11 ragge Exp $	  */

/*
 * Copyright (c) 1994 Ludd, University of Lule}, Sweden.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _VAX_PTE_H_
#define _VAX_PTE_H_

#ifndef _LOCORE
/*
 * VAX page table entries
 */
struct pte {
	unsigned int	pg_pfn:21;	/* Page Frame Number or 0 */
	unsigned int	pg_illegal:2;	/* Don't use this bits */
	unsigned int	pg_sref:1;	/* Help for ref simulation */
	unsigned int	pg_w:1;		/* Wired bit */
	unsigned int	pg_z:1;		/* Zero DIGITAL = 0 */
	unsigned int	pg_m:1;		/* Modify DIGITAL */
	unsigned int	pg_prot:4;	/* reserved at zero */
	unsigned int	pg_v:1;		/* valid bit */
};


typedef struct pte	pt_entry_t;	/* Mach page table entry */

#endif /* _LOCORE */

#define PG_V		0x80000000
#define PG_NV		0x00000000
#define PG_PROT		0x78000000
#define PG_RW		0x20000000
#define PG_KW		0x10000000
#define PG_KR		0x18000000
#define PG_URKW		0x70000000
#define PG_RO		0x78000000
#define PG_NONE		0x00000000
#define PG_M		0x04000000
#define PG_W		0x01000000
#define PG_SREF		0x00800000
#define PG_ILLEGAL	0x00600000
#define PG_FRAME	0x001fffff
#define PG_PFNUM(x)	(((unsigned long)(x) & 0x3ffffe00) >> VAX_PGSHIFT)

#ifndef _LOCORE
extern pt_entry_t *Sysmap;
/*
 * Kernel virtual address to page table entry and to physical address.
 */
#endif

#ifdef __GNUC__
#define	kvtopte(va)	kvtopte0((vaddr_t) (va))
static inline struct pte *
kvtopte0(vaddr_t va)
{
	struct pte *pt;
#ifdef _RUMPKERNEL
	__asm(
		"extzv $9,$21,%1,%0\n\t"
		"moval %2[%0],%0\n\t"
	     : "=r"(pt)
	     : "g"(va), "o"(*Sysmap));
#else
	__asm(
		"extzv $9,$21,%1,%0\n\t"
		"moval *Sysmap[%0],%0\n\t"
	     : "=r"(pt)
	     : "g"(va));
#endif
	return pt;
}

#define	kvtophys(va)	kvtophys0((vaddr_t) (va))
static inline paddr_t
kvtophys0(vaddr_t va)
{
	paddr_t pa;
#ifdef _RUMPKERNEL
	__asm(
		"extzv $9,$21,%1,%0\n\t"
		"ashl $9,%2[%0],%0\n\t"
		"insv %1,$0,$9,%0\n\t"
	    : "=&r"(pa)
	    : "g"(va), "o"(*Sysmap) : "cc");
#else
	__asm(
		"extzv $9,$21,%1,%0\n\t"
		"ashl $9,*Sysmap[%0],%0\n\t"
		"insv %1,$0,$9,%0\n\t"
	    : "=&r"(pa)
	    : "g"(va) : "cc");
#endif
	return pa;
}
#else /* __GNUC__ */
#define kvtophys(va) \
	(((kvtopte(va))->pg_pfn << VAX_PGSHIFT) | ((paddr_t)(va) & VAX_PGOFSET))
#define kvtopte(va) (&Sysmap[PG_PFNUM(va)])
#endif /* __GNUC__ */
#define uvtopte(va, pcb) \
	(((vaddr_t)va < 0x40000000) ? \
	&(((pcb)->P0BR)[PG_PFNUM(va)]) : \
	&(((pcb)->P1BR)[PG_PFNUM(va)]))

#endif