xref: /illumos-gate/usr/src/uts/common/vm/seg_kpm.h (revision a31148363f598def767ac48c5d82e1572e44b935)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2003 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef	_VM_SEG_KPM_H
#define	_VM_SEG_KPM_H

#ifdef	__cplusplus
extern "C" {
#endif

/*
 * Kernel Physical Mapping (segkpm) segment driver.
 */

#include <vm/kpm.h>

struct segkpm_data {
	ushort_t *skd_va_select; /* page_create_va kpm vaddr bin count */
	short    skd_nvcolors;   /* VAC colors to deal with */
	uchar_t  skd_prot;
};

/*
 * segkpm create needs some platform knowledge
 */
struct segkpm_crargs {
	uint_t	prot;
	short	nvcolors;	/* VAC # virtual colors, 0 for PAC. */
};

extern struct seg *segkpm;
extern u_offset_t kpm_pgoff;
extern size_t	kpm_pgsz;
extern uint_t	kpm_pgshft;
extern uint_t	kpmp2pshft;
extern pgcnt_t	kpmpnpgs;

/* kpm controls */
extern int	kpm_enable;
extern int	kpm_smallpages;
extern int	segmap_kpm;

/*
 * kpm_page_t macros:
 * . bytes (b) to kpm pages (kpmp)
 * . pages (p) to kpm pages (kpmp), and back (with and without roundup)
 * . kpm page offset in bytes
 * . pages (p) modulo kpm pages (kpmp)
 */
#define	btokpmp(x)	((x) >> kpm_pgshft)
#define	btokpmpr(x)	(((x) + kpm_pgoff) >> kpm_pgshft)
#define	ptokpmp(x)	((x) >> kpmp2pshft)
#define	ptokpmpr(x)	(((x) + (kpmpnpgs - 1)) >> kpmp2pshft)
#define	kpmptop(x)	((x) << kpmp2pshft)
#define	kpmpageoff(x)	((x) & kpm_pgoff)
#define	pmodkpmp(x)	((x) & (kpmpnpgs - 1))

#ifdef	SEGKPM_SUPPORT

#define	IS_KPM_ADDR(addr) \
	((addr) >= segkpm->s_base && (addr) < (segkpm->s_base + segkpm->s_size))

#ifdef	__x86
/* x86 systems use neither kpm_page_t nor kpm_spage_t when supporting kpm. */
#define	KPMPAGE_T_SZ	(0)
#else	/* __x86 */
#define	KPMPAGE_T_SZ \
	((kpm_smallpages == 0) ? sizeof (kpm_page_t) : sizeof (kpm_spage_t))
#endif	/* __x86 */

#else	/* SEGKPM_SUPPORT */

#define	IS_KPM_ADDR(addr) (segkpm != NULL)
#define	KPMPAGE_T_SZ	(0)

#endif	/* SEGKPM_SUPPORT */

#ifdef _KERNEL
/*
 * Public seg_kpm segment operations.
 */
extern int		segkpm_create(struct seg *, void *);
extern faultcode_t	segkpm_fault(struct hat *, struct seg *, caddr_t,
				size_t, enum fault_type, enum seg_rw);

/*
 * Public seg_kpm interfaces.
 */
extern caddr_t	segkpm_create_va(u_offset_t);
extern void	segkpm_mapout_validkpme(struct kpme *);

#endif	/* _KERNEL */

#ifdef	__cplusplus
}
#endif

#endif	/* _VM_SEG_KPM_H */