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/* $OpenBSD: pmap.h,v 1.21 2010/11/24 20:59:17 miod 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. 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.
*
* from: @(#)pmap.h 8.1 (Berkeley) 6/10/93
*/
#ifndef _MIPS_PMAP_H_
#define _MIPS_PMAP_H_
#ifdef _KERNEL
#include <machine/pte.h>
/*
* The user address space is currently limited to 2Gb (0x0 - 0x80000000).
*
* 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.
*
* 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.
*/
/*
* Size of second level page structs (page tables, and segment table) used
* by this pmap.
*/
#define PMAP_L2SHIFT 12
#define PMAP_L2SIZE (1UL << PMAP_L2SHIFT)
/*
* Segment sizes
*/
/* -2 below is for log2(sizeof pt_entry_t) */
#define SEGSHIFT (PAGE_SHIFT + PMAP_L2SHIFT - 2)
#define NBSEG (1UL << SEGSHIFT)
#define SEGOFSET (NBSEG - 1)
#define mips_trunc_seg(x) ((vaddr_t)(x) & ~SEGOFSET)
#define mips_round_seg(x) (((vaddr_t)(x) + SEGOFSET) & ~SEGOFSET)
#define pmap_segmap(m, v) ((m)->pm_segtab->seg_tab[((v) >> SEGSHIFT)])
#define PMAP_SEGTABSIZE (PMAP_L2SIZE / sizeof(void *))
struct segtab {
pt_entry_t *seg_tab[PMAP_SEGTABSIZE];
};
struct pmap_asid_info {
u_int pma_asid; /* address space tag */
u_int pma_asidgen; /* TLB PID generation number */
};
/*
* 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 */
struct segtab *pm_segtab; /* pointers to pages of PTEs */
struct pmap_asid_info pm_asid[1]; /* ASID information */
} *pmap_t;
/*
* Compute the sizeof of a pmap structure. Subtract one because one
* ASID info structure is already included in the pmap structure itself.
*/
#define PMAP_SIZEOF(x) \
(ALIGN(sizeof(struct pmap) + \
(sizeof(struct pmap_asid_info) * ((x) - 1))))
/* flags for pv_entry */
#define PV_UNCACHED PG_PMAP0 /* Page is mapped unchached */
#define PV_CACHED PG_PMAP1 /* Page has been cached */
#define PV_ATTR_MOD PG_PMAP2
#define PV_ATTR_REF PG_PMAP3
#define PV_PRESERVE (PV_ATTR_MOD | PV_ATTR_REF)
extern struct pmap *const kernel_pmap_ptr;
#define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count)
#define pmap_wired_count(pmap) ((pmap)->pm_stats.wired_count)
#define pmap_kernel() (kernel_pmap_ptr)
#define pmap_phys_address(ppn) ptoa(ppn)
#define PMAP_STEAL_MEMORY /* Enable 'stealing' during boot */
#define PMAP_PREFER(pa, va) pmap_prefer(pa, va)
#define pmap_update(x) do { /* nothing */ } while (0)
void pmap_bootstrap(void);
int pmap_is_page_ro( pmap_t, vaddr_t, pt_entry_t);
void pmap_kenter_cache(vaddr_t va, paddr_t pa, vm_prot_t prot, int cache);
void pmap_prefer(vaddr_t, vaddr_t *);
void pmap_set_modify(vm_page_t);
void pmap_page_cache(vm_page_t, int);
#define pmap_collect(x) do { /* nothing */ } while (0)
#define pmap_unuse_final(p) do { /* nothing yet */ } while (0)
#define pmap_remove_holes(map) do { /* nothing */ } while (0)
void pmap_update_user_page(pmap_t, vaddr_t, pt_entry_t);
#ifdef MULTIPROCESSOR
void pmap_update_kernel_page(vaddr_t, pt_entry_t);
#else
#define pmap_update_kernel_page(va, entry) tlb_update(va, entry)
#endif
#endif /* _KERNEL */
#endif /* !_MIPS_PMAP_H_ */
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