NetBSD/sys/arch/mips/include/pmap.h

147 lines
5.2 KiB
C

/* $NetBSD: pmap.h,v 1.17 1998/02/25 23:26:41 thorpej 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 mips_trunc_seg(x) ((vm_offset_t)(x) & ~SEGOFSET)
#define mips_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;
/*
* For each vm_page_t, there is a list of all currently valid virtual
* mappings of that page. An entry is a pv_entry_t, the list is pv_table.
* XXX really should do this as a part of the higher level code.
*/
typedef struct pv_entry {
struct pv_entry *pv_next; /* next pv_entry */
struct pmap *pv_pmap; /* pmap where mapping lies */
vm_offset_t pv_va; /* virtual address for mapping */
int pv_flags; /* some flags for the mapping */
} *pv_entry_t;
#define PV_UNCACHED 0x0001 /* page is mapped uncached */
/*
* 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)
#define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count)
/*
* Bootstrap the system enough to run with virtual memory.
*/
void pmap_bootstrap __P((void));
/*
* pmap_prefer() helps reduce virtual-coherency exceptions in
* the virtually-indexed cache on mips3 CPUs.
*/
#ifdef MIPS3
#define PMAP_PREFER(pa, va) pmap_prefer((pa), (va))
void pmap_prefer __P((vm_offset_t, vm_offset_t *));
#endif /* MIPS3 */
#define PMAP_STEAL_MEMORY /* enable pmap_steal_memory() */
/*
* Kernel cache operations for the user-space API
*/
int mips_user_cacheflush __P((struct proc *p, vm_offset_t va, int nbytes,
int whichcache));
int mips_user_cachectl __P((struct proc *p, vm_offset_t va, int nbytes,
int ctl));
#endif /* _KERNEL */
#endif /* _PMAP_MACHINE_ */