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freebsd-dev/sys/mips/include/pmap.h
Alan Cox 3153e878dd Add support to the virtual memory system for configuring machine- 
dependent memory attributes:

Rename vm_cache_mode_t to vm_memattr_t.  The new name reflects the
fact that there are machine-dependent memory attributes that have
nothing to do with controlling the cache's behavior.

Introduce vm_object_set_memattr() for setting the default memory
attributes that will be given to an object's pages.

Introduce and use pmap_page_{get,set}_memattr() for getting and
setting a page's machine-dependent memory attributes.  Add full
support for these functions on amd64 and i386 and stubs for them on
the other architectures.  The function pmap_page_set_memattr() is also
responsible for any other machine-dependent aspects of changing a
page's memory attributes, such as flushing the cache or updating the
direct map.  The uses include kmem_alloc_contig(), vm_page_alloc(),
and the device pager:

  kmem_alloc_contig() can now be used to allocate kernel memory with
  non-default memory attributes on amd64 and i386.

  vm_page_alloc() and the device pager will set the memory attributes
  for the real or fictitious page according to the object's default
  memory attributes.

Update the various pmap functions on amd64 and i386 that map pages to
incorporate each page's memory attributes in the mapping.

Notes: (1) Inherent to this design are safety features that prevent
the specification of inconsistent memory attributes by different
mappings on amd64 and i386.  In addition, the device pager provides a
warning when a device driver creates a fictitious page with memory
attributes that are inconsistent with the real page that the
fictitious page is an alias for. (2) Storing the machine-dependent
memory attributes for amd64 and i386 as a dedicated "int" in "struct
md_page" represents a compromise between space efficiency and the ease
of MFCing these changes to RELENG_7.

In collaboration with: jhb

Approved by:	re (kib)
2009-07-12 23:31:20 +00:00

212 lines
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/*-
* Copyright (c) 1991 Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department and William Jolitz of UUNET Technologies Inc.
*
* 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.
* 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.
*
* Derived from hp300 version by Mike Hibler, this version by William
* Jolitz uses a recursive map [a pde points to the page directory] to
* map the page tables using the pagetables themselves. This is done to
* reduce the impact on kernel virtual memory for lots of sparse address
* space, and to reduce the cost of memory to each process.
*
* from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90
* from: @(#)pmap.h 7.4 (Berkeley) 5/12/91
* from: src/sys/i386/include/pmap.h,v 1.65.2.2 2000/11/30 01:54:42 peter
* JNPR: pmap.h,v 1.7.2.1 2007/09/10 07:44:12 girish
* $FreeBSD$
*/
#ifndef _MACHINE_PMAP_H_
#define _MACHINE_PMAP_H_
#include <machine/vmparam.h>
#include <machine/pte.h>
#define VADDR(pdi, pti) ((vm_offset_t)(((pdi)<<PDRSHIFT)|((pti)<<PAGE_SHIFT)))
#define NKPT 120 /* actual number of kernel page tables */
#ifndef NKPDE
#define NKPDE 255 /* addressable number of page tables/pde's */
#endif
#define KPTDI (VM_MIN_KERNEL_ADDRESS >> SEGSHIFT)
#define NUSERPGTBLS (VM_MAXUSER_ADDRESS >> SEGSHIFT)
#ifndef LOCORE
#include <sys/queue.h>
#include <sys/_lock.h>
#include <sys/_mutex.h>
/*
* Pmap stuff
*/
struct pv_entry;
struct md_page {
int pv_list_count;
int pv_flags;
TAILQ_HEAD(, pv_entry) pv_list;
};
#define PV_TABLE_MOD 0x01 /* modified */
#define PV_TABLE_REF 0x02 /* referenced */
#define ASID_BITS 8
#define ASIDGEN_BITS (32 - ASID_BITS)
#define ASIDGEN_MASK ((1 << ASIDGEN_BITS) - 1)
struct pmap {
pd_entry_t *pm_segtab; /* KVA of segment table */
TAILQ_HEAD(, pv_entry) pm_pvlist; /* list of mappings in
* pmap */
int pm_active; /* active on cpus */
struct {
u_int32_t asid:ASID_BITS; /* TLB address space tag */
u_int32_t gen:ASIDGEN_BITS; /* its generation number */
} pm_asid[MAXSMPCPU];
struct pmap_statistics pm_stats; /* pmap statistics */
struct vm_page *pm_ptphint; /* pmap ptp hint */
struct mtx pm_mtx;
};
typedef struct pmap *pmap_t;
#ifdef _KERNEL
pt_entry_t *pmap_pte(pmap_t, vm_offset_t);
pd_entry_t pmap_segmap(pmap_t pmap, vm_offset_t va);
vm_offset_t pmap_kextract(vm_offset_t va);
#define vtophys(va) pmap_kextract(((vm_offset_t) (va)))
extern struct pmap kernel_pmap_store;
#define kernel_pmap (&kernel_pmap_store)
#define PMAP_LOCK(pmap) mtx_lock(&(pmap)->pm_mtx)
#define PMAP_LOCK_ASSERT(pmap, type) mtx_assert(&(pmap)->pm_mtx, (type))
#define PMAP_LOCK_DESTROY(pmap) mtx_destroy(&(pmap)->pm_mtx)
#define PMAP_LOCK_INIT(pmap) mtx_init(&(pmap)->pm_mtx, "pmap", \
NULL, MTX_DEF)
#define PMAP_LOCKED(pmap) mtx_owned(&(pmap)->pm_mtx)
#define PMAP_MTX(pmap) (&(pmap)->pm_mtx)
#define PMAP_TRYLOCK(pmap) mtx_trylock(&(pmap)->pm_mtx)
#define PMAP_UNLOCK(pmap) mtx_unlock(&(pmap)->pm_mtx)
#define PMAP_LGMEM_LOCK_INIT(sysmap) mtx_init(&(sysmap)->lock, "pmap-lgmem", \
"per-cpu-map", (MTX_DEF| MTX_DUPOK))
#define PMAP_LGMEM_LOCK(sysmap) mtx_lock(&(sysmap)->lock)
#define PMAP_LGMEM_UNLOCK(sysmap) mtx_unlock(&(sysmap)->lock)
#define PMAP_LGMEM_DESTROY(sysmap) mtx_destroy(&(sysmap)->lock)
/*
* 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.
*/
typedef struct pv_entry {
pmap_t pv_pmap; /* pmap where mapping lies */
vm_offset_t pv_va; /* virtual address for mapping */
TAILQ_ENTRY(pv_entry) pv_list;
TAILQ_ENTRY(pv_entry) pv_plist;
vm_page_t pv_ptem; /* VM page for pte */
boolean_t pv_wired; /* whether this entry is wired */
} *pv_entry_t;
#if defined(DIAGNOSTIC)
#define PMAP_DIAGNOSTIC
#endif
extern vm_offset_t phys_avail[];
extern char *ptvmmap; /* poor name! */
extern vm_offset_t virtual_avail;
extern vm_offset_t virtual_end;
extern pd_entry_t *segbase;
extern vm_paddr_t mips_wired_tlb_physmem_start;
extern vm_paddr_t mips_wired_tlb_physmem_end;
extern u_int need_wired_tlb_page_pool;
#define pmap_page_get_memattr(m) VM_MEMATTR_DEFAULT
#define pmap_page_is_mapped(m) (!TAILQ_EMPTY(&(m)->md.pv_list))
#define pmap_page_set_memattr(m, ma) (void)0
void pmap_bootstrap(void);
void *pmap_mapdev(vm_offset_t, vm_size_t);
void pmap_unmapdev(vm_offset_t, vm_size_t);
vm_offset_t pmap_steal_memory(vm_size_t size);
void pmap_set_modified(vm_offset_t pa);
int page_is_managed(vm_offset_t pa);
void pmap_page_is_free(vm_page_t m);
void pmap_kenter(vm_offset_t va, vm_paddr_t pa);
void pmap_kremove(vm_offset_t va);
void *pmap_kenter_temporary(vm_paddr_t pa, int i);
void pmap_kenter_temporary_free(vm_paddr_t pa);
int pmap_compute_pages_to_dump(void);
void pmap_update_page(pmap_t pmap, vm_offset_t va, pt_entry_t pte);
/*
* floating virtual pages (FPAGES)
*
* These are the reserved virtual memory areas which can be
* mapped to any physical memory.
*/
#define FPAGES 2
#define FPAGES_SHARED 2
#define FSPACE ((FPAGES * MAXCPU + FPAGES_SHARED) * PAGE_SIZE)
#define PMAP_FPAGE1 0x00 /* Used by pmap_zero_page &
* pmap_copy_page */
#define PMAP_FPAGE2 0x01 /* Used by pmap_copy_page */
#define PMAP_FPAGE3 0x00 /* Used by pmap_zero_page_idle */
#define PMAP_FPAGE_KENTER_TEMP 0x01 /* Used by coredump */
struct fpage {
vm_offset_t kva;
u_int state;
};
struct sysmaps {
struct mtx lock;
struct fpage fp[FPAGES];
};
vm_offset_t
pmap_map_fpage(vm_paddr_t pa, struct fpage *fp,
boolean_t check_unmaped);
void pmap_unmap_fpage(vm_paddr_t pa, struct fpage *fp);
#endif /* _KERNEL */
#endif /* !LOCORE */
#endif /* !_MACHINE_PMAP_H_ */
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