416 lines
13 KiB
C++
416 lines
13 KiB
C++
/* $NetBSD: vm_page.h,v 1.34 1999/12/30 16:09:47 eeh Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* The Mach Operating System project at Carnegie-Mellon University.
|
|
*
|
|
* 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.
|
|
*
|
|
* @(#)vm_page.h 8.3 (Berkeley) 1/9/95
|
|
*
|
|
*
|
|
* Copyright (c) 1987, 1990 Carnegie-Mellon University.
|
|
* All rights reserved.
|
|
*
|
|
* Authors: Avadis Tevanian, Jr., Michael Wayne Young
|
|
*
|
|
* Permission to use, copy, modify and distribute this software and
|
|
* its documentation is hereby granted, provided that both the copyright
|
|
* notice and this permission notice appear in all copies of the
|
|
* software, derivative works or modified versions, and any portions
|
|
* thereof, and that both notices appear in supporting documentation.
|
|
*
|
|
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
|
|
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
|
|
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
|
|
*
|
|
* Carnegie Mellon requests users of this software to return to
|
|
*
|
|
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
|
|
* School of Computer Science
|
|
* Carnegie Mellon University
|
|
* Pittsburgh PA 15213-3890
|
|
*
|
|
* any improvements or extensions that they make and grant Carnegie the
|
|
* rights to redistribute these changes.
|
|
*/
|
|
|
|
/*
|
|
* Resident memory system definitions.
|
|
*/
|
|
#ifndef _VM_PAGE_
|
|
#define _VM_PAGE_
|
|
|
|
/*
|
|
* Management of resident (logical) pages.
|
|
*
|
|
* A small structure is kept for each resident
|
|
* page, indexed by page number. Each structure
|
|
* is an element of several lists:
|
|
*
|
|
* A hash table bucket used to quickly
|
|
* perform object/offset lookups
|
|
*
|
|
* A list of all pages for a given object,
|
|
* so they can be quickly deactivated at
|
|
* time of deallocation.
|
|
*
|
|
* An ordered list of pages due for pageout.
|
|
*
|
|
* In addition, the structure contains the object
|
|
* and offset to which this page belongs (for pageout),
|
|
* and sundry status bits.
|
|
*
|
|
* Fields in this structure are locked either by the lock on the
|
|
* object that the page belongs to (O) or by the lock on the page
|
|
* queues (P) [or both].
|
|
*/
|
|
|
|
/*
|
|
* locking note: the mach version of this data structure had bit
|
|
* fields for the flags, and the bit fields were divided into two
|
|
* items (depending on who locked what). some time, in BSD, the bit
|
|
* fields were dumped and all the flags were lumped into one short.
|
|
* that is fine for a single threaded uniprocessor OS, but bad if you
|
|
* want to actual make use of locking (simple_lock's). so, we've
|
|
* seperated things back out again.
|
|
*
|
|
* note the page structure has no lock of its own.
|
|
*/
|
|
|
|
#include <uvm/uvm_extern.h>
|
|
#include <vm/pglist.h>
|
|
|
|
struct vm_page {
|
|
TAILQ_ENTRY(vm_page) pageq; /* queue info for FIFO
|
|
* queue or free list (P) */
|
|
TAILQ_ENTRY(vm_page) hashq; /* hash table links (O)*/
|
|
TAILQ_ENTRY(vm_page) listq; /* pages in same object (O)*/
|
|
|
|
vaddr_t offset; /* offset into object (O,P) */
|
|
|
|
struct uvm_object *uobject; /* object (O,P) */
|
|
struct vm_anon *uanon; /* anon (O,P) */
|
|
u_short flags; /* object flags [O] */
|
|
u_short version; /* version count [O] */
|
|
u_short wire_count; /* wired down map refs [P] */
|
|
u_short pqflags; /* page queue flags [P] */
|
|
u_int loan_count; /* number of active loans
|
|
* to read: [O or P]
|
|
* to modify: [O _and_ P] */
|
|
paddr_t phys_addr; /* physical address of page */
|
|
#if defined(UVM_PAGE_TRKOWN)
|
|
/* debugging fields to track page ownership */
|
|
pid_t owner; /* proc that set PG_BUSY */
|
|
char *owner_tag; /* why it was set busy */
|
|
#endif
|
|
};
|
|
|
|
/*
|
|
* These are the flags defined for vm_page.
|
|
*
|
|
* Note: PG_FILLED and PG_DIRTY are added for the filesystems.
|
|
*/
|
|
|
|
/*
|
|
* locking rules:
|
|
* PG_ ==> locked by object lock
|
|
* PQ_ ==> lock by page queue lock
|
|
* PQ_FREE is locked by free queue lock and is mutex with all other PQs
|
|
*
|
|
* possible deadwood: PG_FAULTING, PQ_LAUNDRY
|
|
*/
|
|
#define PG_CLEAN 0x0008 /* page has not been modified */
|
|
#define PG_BUSY 0x0010 /* page is in transit */
|
|
#define PG_WANTED 0x0020 /* someone is waiting for page */
|
|
#define PG_TABLED 0x0040 /* page is in VP table */
|
|
#define PG_FAKE 0x0200 /* page is placeholder for pagein */
|
|
#define PG_FILLED 0x0400 /* client flag to set when filled */
|
|
#define PG_DIRTY 0x0800 /* client flag to set when dirty */
|
|
#define PG_RELEASED 0x1000 /* page released while paging */
|
|
#define PG_FAULTING 0x2000 /* page is being faulted in */
|
|
#define PG_CLEANCHK 0x4000 /* clean bit has been checked */
|
|
|
|
#define PQ_FREE 0x0001 /* page is on free list */
|
|
#define PQ_INACTIVE 0x0002 /* page is in inactive list */
|
|
#define PQ_ACTIVE 0x0004 /* page is in active list */
|
|
#define PQ_LAUNDRY 0x0008 /* page is being cleaned now */
|
|
#define PQ_ANON 0x0010 /* page is part of an anon, rather
|
|
than an uvm_object */
|
|
#define PQ_AOBJ 0x0020 /* page is part of an anonymous
|
|
uvm_object */
|
|
#define PQ_SWAPBACKED (PQ_ANON|PQ_AOBJ)
|
|
|
|
/*
|
|
* physical memory layout structure
|
|
*
|
|
* MD vmparam.h must #define:
|
|
* VM_PHYSEG_MAX = max number of physical memory segments we support
|
|
* (if this is "1" then we revert to a "contig" case)
|
|
* VM_PHYSSEG_STRAT: memory sort/search options (for VM_PHYSEG_MAX > 1)
|
|
* - VM_PSTRAT_RANDOM: linear search (random order)
|
|
* - VM_PSTRAT_BSEARCH: binary search (sorted by address)
|
|
* - VM_PSTRAT_BIGFIRST: linear search (sorted by largest segment first)
|
|
* - others?
|
|
* XXXCDC: eventually we should remove contig and old non-contig cases
|
|
* and purge all left-over global variables...
|
|
*/
|
|
#define VM_PSTRAT_RANDOM 1
|
|
#define VM_PSTRAT_BSEARCH 2
|
|
#define VM_PSTRAT_BIGFIRST 3
|
|
|
|
/*
|
|
* vm_physmemseg: describes one segment of physical memory
|
|
*/
|
|
struct vm_physseg {
|
|
paddr_t start; /* PF# of first page in segment */
|
|
paddr_t end; /* (PF# of last page in segment) + 1 */
|
|
paddr_t avail_start; /* PF# of first free page in segment */
|
|
paddr_t avail_end; /* (PF# of last free page in segment) +1 */
|
|
int free_list; /* which free list they belong on */
|
|
struct vm_page *pgs; /* vm_page structures (from start) */
|
|
struct vm_page *lastpg; /* vm_page structure for end */
|
|
struct pmap_physseg pmseg; /* pmap specific (MD) data */
|
|
};
|
|
|
|
#if defined(_KERNEL)
|
|
|
|
/*
|
|
* Each pageable resident page falls into one of three lists:
|
|
*
|
|
* free
|
|
* Available for allocation now.
|
|
* inactive
|
|
* Not referenced in any map, but still has an
|
|
* object/offset-page mapping, and may be dirty.
|
|
* This is the list of pages that should be
|
|
* paged out next.
|
|
* active
|
|
* A list of pages which have been placed in
|
|
* at least one physical map. This list is
|
|
* ordered, in LRU-like fashion.
|
|
*/
|
|
|
|
extern
|
|
struct pglist vm_page_queue_free; /* memory free queue */
|
|
extern
|
|
struct pglist vm_page_queue_active; /* active memory queue */
|
|
extern
|
|
struct pglist vm_page_queue_inactive; /* inactive memory queue */
|
|
|
|
|
|
/*
|
|
* physical memory config is stored in vm_physmem.
|
|
*/
|
|
|
|
extern struct vm_physseg vm_physmem[VM_PHYSSEG_MAX];
|
|
extern int vm_nphysseg;
|
|
|
|
/*
|
|
* prototypes
|
|
*/
|
|
|
|
static struct vm_page *PHYS_TO_VM_PAGE __P((paddr_t));
|
|
static int vm_physseg_find __P((paddr_t, int *));
|
|
|
|
/*
|
|
* macros and inlines
|
|
*/
|
|
#define VM_PAGE_TO_PHYS(entry) ((entry)->phys_addr)
|
|
|
|
/*
|
|
* when VM_PHYSSEG_MAX is 1, we can simplify these functions
|
|
*/
|
|
|
|
/*
|
|
* vm_physseg_find: find vm_physseg structure that belongs to a PA
|
|
*/
|
|
static __inline int
|
|
vm_physseg_find(pframe, offp)
|
|
paddr_t pframe;
|
|
int *offp;
|
|
{
|
|
#if VM_PHYSSEG_MAX == 1
|
|
|
|
/* 'contig' case */
|
|
if (pframe >= vm_physmem[0].start && pframe < vm_physmem[0].end) {
|
|
if (offp)
|
|
*offp = pframe - vm_physmem[0].start;
|
|
return(0);
|
|
}
|
|
return(-1);
|
|
|
|
#elif (VM_PHYSSEG_STRAT == VM_PSTRAT_BSEARCH)
|
|
/* binary search for it */
|
|
int start, len, try;
|
|
|
|
/*
|
|
* if try is too large (thus target is less than than try) we reduce
|
|
* the length to trunc(len/2) [i.e. everything smaller than "try"]
|
|
*
|
|
* if the try is too small (thus target is greater than try) then
|
|
* we set the new start to be (try + 1). this means we need to
|
|
* reduce the length to (round(len/2) - 1).
|
|
*
|
|
* note "adjust" below which takes advantage of the fact that
|
|
* (round(len/2) - 1) == trunc((len - 1) / 2)
|
|
* for any value of len we may have
|
|
*/
|
|
|
|
for (start = 0, len = vm_nphysseg ; len != 0 ; len = len / 2) {
|
|
try = start + (len / 2); /* try in the middle */
|
|
|
|
/* start past our try? */
|
|
if (pframe >= vm_physmem[try].start) {
|
|
/* was try correct? */
|
|
if (pframe < vm_physmem[try].end) {
|
|
if (offp)
|
|
*offp = pframe - vm_physmem[try].start;
|
|
return(try); /* got it */
|
|
}
|
|
start = try + 1; /* next time, start here */
|
|
len--; /* "adjust" */
|
|
} else {
|
|
/*
|
|
* pframe before try, just reduce length of
|
|
* region, done in "for" loop
|
|
*/
|
|
}
|
|
}
|
|
return(-1);
|
|
|
|
#else
|
|
/* linear search for it */
|
|
int lcv;
|
|
|
|
for (lcv = 0; lcv < vm_nphysseg; lcv++) {
|
|
if (pframe >= vm_physmem[lcv].start &&
|
|
pframe < vm_physmem[lcv].end) {
|
|
if (offp)
|
|
*offp = pframe - vm_physmem[lcv].start;
|
|
return(lcv); /* got it */
|
|
}
|
|
}
|
|
return(-1);
|
|
|
|
#endif
|
|
}
|
|
|
|
|
|
/*
|
|
* IS_VM_PHYSADDR: only used my mips/pmax/pica trap/pmap.
|
|
*/
|
|
|
|
#define IS_VM_PHYSADDR(PA) (vm_physseg_find(atop(PA), NULL) != -1)
|
|
|
|
/*
|
|
* PHYS_TO_VM_PAGE: find vm_page for a PA. used by MI code to get vm_pages
|
|
* back from an I/O mapping (ugh!). used in some MD code as well.
|
|
*/
|
|
static __inline struct vm_page *
|
|
PHYS_TO_VM_PAGE(pa)
|
|
paddr_t pa;
|
|
{
|
|
paddr_t pf = atop(pa);
|
|
int off;
|
|
int psi;
|
|
|
|
psi = vm_physseg_find(pf, &off);
|
|
if (psi != -1)
|
|
return(&vm_physmem[psi].pgs[off]);
|
|
return(NULL);
|
|
}
|
|
|
|
#define VM_PAGE_IS_FREE(entry) ((entry)->pqflags & PQ_FREE)
|
|
|
|
extern
|
|
simple_lock_data_t vm_page_queue_lock; /* lock on active and inactive
|
|
page queues */
|
|
extern /* lock on free page queue */
|
|
simple_lock_data_t vm_page_queue_free_lock;
|
|
|
|
#define PAGE_ASSERT_WAIT(m, interruptible) { \
|
|
(m)->flags |= PG_WANTED; \
|
|
assert_wait((m), (interruptible)); \
|
|
}
|
|
|
|
#define PAGE_WAKEUP(m) { \
|
|
(m)->flags &= ~PG_BUSY; \
|
|
if ((m)->flags & PG_WANTED) { \
|
|
(m)->flags &= ~PG_WANTED; \
|
|
wakeup((m)); \
|
|
} \
|
|
}
|
|
|
|
#define vm_page_lock_queues() simple_lock(&vm_page_queue_lock)
|
|
#define vm_page_unlock_queues() simple_unlock(&vm_page_queue_lock)
|
|
|
|
#define vm_page_set_modified(m) { (m)->flags &= ~PG_CLEAN; }
|
|
|
|
#define VM_PAGE_INIT(mem, obj, offset) { \
|
|
(mem)->flags = PG_BUSY | PG_CLEAN | PG_FAKE; \
|
|
if (obj) \
|
|
vm_page_insert((mem), (obj), (offset)); \
|
|
else \
|
|
(mem)->object = NULL; \
|
|
(mem)->wire_count = 0; \
|
|
}
|
|
|
|
#if VM_PAGE_DEBUG
|
|
|
|
/*
|
|
* VM_PAGE_CHECK: debugging check of a vm_page structure
|
|
*/
|
|
static __inline void
|
|
VM_PAGE_CHECK(mem)
|
|
struct vm_page *mem;
|
|
{
|
|
int lcv;
|
|
|
|
for (lcv = 0 ; lcv < vm_nphysseg ; lcv++) {
|
|
if ((unsigned int) mem >= (unsigned int) vm_physmem[lcv].pgs &&
|
|
(unsigned int) mem <= (unsigned int) vm_physmem[lcv].lastpg)
|
|
break;
|
|
}
|
|
if (lcv == vm_nphysseg ||
|
|
(mem->flags & (PG_ACTIVE|PG_INACTIVE)) == (PG_ACTIVE|PG_INACTIVE))
|
|
panic("vm_page_check: not valid!");
|
|
return;
|
|
}
|
|
|
|
#else /* VM_PAGE_DEBUG */
|
|
#define VM_PAGE_CHECK(mem)
|
|
#endif /* VM_PAGE_DEBUG */
|
|
|
|
#endif /* _KERNEL */
|
|
#endif /* !_VM_PAGE_ */
|