106 lines
4.0 KiB
C
106 lines
4.0 KiB
C
/* $NetBSD: pmap.h,v 1.8 1995/04/12 01:55:35 mellon Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1987 Carnegie-Mellon University
|
|
* Copyright (c) 1992, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Ralph Campbell.
|
|
*
|
|
* 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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
|
|
*
|
|
* @(#)pmap.h 8.1 (Berkeley) 6/10/93
|
|
*/
|
|
|
|
#ifndef _PMAP_MACHINE_
|
|
#define _PMAP_MACHINE_
|
|
|
|
/*
|
|
* The user address space is 2Gb (0x0 - 0x80000000).
|
|
* User programs are laid out in memory as follows:
|
|
* address
|
|
* USRTEXT 0x00001000
|
|
* USRDATA USRTEXT + text_size
|
|
* USRSTACK 0x7FFFFFFF
|
|
*
|
|
* The user address space is mapped using a two level structure where
|
|
* virtual address bits 30..22 are used to index into a segment table which
|
|
* points to a page worth of PTEs (4096 page can hold 1024 PTEs).
|
|
* Bits 21..12 are then used to index a PTE which describes a page within
|
|
* a segment.
|
|
*
|
|
* The wired entries in the TLB will contain the following:
|
|
* 0-1 (UPAGES) for curproc user struct and kernel stack.
|
|
*
|
|
* Note: The kernel doesn't use the same data structures as user programs.
|
|
* All the PTE entries are stored in a single array in Sysmap which is
|
|
* dynamically allocated at boot time.
|
|
*/
|
|
|
|
#define pmax_trunc_seg(x) ((vm_offset_t)(x) & ~SEGOFSET)
|
|
#define pmax_round_seg(x) (((vm_offset_t)(x) + SEGOFSET) & ~SEGOFSET)
|
|
#define pmap_segmap(m, v) ((m)->pm_segtab->seg_tab[((v) >> SEGSHIFT)])
|
|
|
|
#define PMAP_SEGTABSIZE 512
|
|
|
|
union pt_entry;
|
|
|
|
struct segtab {
|
|
union pt_entry *seg_tab[PMAP_SEGTABSIZE];
|
|
};
|
|
|
|
/*
|
|
* Machine dependent pmap structure.
|
|
*/
|
|
typedef struct pmap {
|
|
int pm_count; /* pmap reference count */
|
|
simple_lock_data_t pm_lock; /* lock on pmap */
|
|
struct pmap_statistics pm_stats; /* pmap statistics */
|
|
int pm_tlbpid; /* address space tag */
|
|
u_int pm_tlbgen; /* TLB PID generation number */
|
|
struct segtab *pm_segtab; /* pointers to pages of PTEs */
|
|
} *pmap_t;
|
|
|
|
/*
|
|
* Defines for pmap_attributes[phys_mach_page];
|
|
*/
|
|
#define PMAP_ATTR_MOD 0x01 /* page has been modified */
|
|
#define PMAP_ATTR_REF 0x02 /* page has been referenced */
|
|
|
|
#ifdef _KERNEL
|
|
char *pmap_attributes; /* reference and modify bits */
|
|
struct pmap kernel_pmap_store;
|
|
|
|
#define pmap_wired_count(pmap) ((pmap)->pm_stats.wired_count)
|
|
#define pmap_kernel() (&kernel_pmap_store)
|
|
#endif /* _KERNEL */
|
|
|
|
#endif /* _PMAP_MACHINE_ */
|