cdd7357cc5
advantages. First, PV entries are roughly half the size. Second, this allocator doesn't access the paging queues, and thus it allows for the removal of the page queues lock from this pmap. Replace all uses of the page queues lock by a R/W lock that is private to this pmap. Tested by: marcel
153 lines
5.1 KiB
C
153 lines
5.1 KiB
C
/*-
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* Copyright (c) 1991 Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department and William Jolitz of UUNET Technologies Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Derived from hp300 version by Mike Hibler, this version by William
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* Jolitz uses a recursive map [a pde points to the page directory] to
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* map the page tables using the pagetables themselves. This is done to
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* reduce the impact on kernel virtual memory for lots of sparse address
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* space, and to reduce the cost of memory to each process.
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*
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* from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90
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* from: @(#)pmap.h 7.4 (Berkeley) 5/12/91
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* from: i386 pmap.h,v 1.54 1997/11/20 19:30:35 bde Exp
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* $FreeBSD$
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*/
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#ifndef _MACHINE_PMAP_H_
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#define _MACHINE_PMAP_H_
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#include <sys/queue.h>
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#include <sys/_lock.h>
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#include <sys/_mutex.h>
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#include <machine/atomic.h>
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#include <machine/pte.h>
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#include <machine/vmparam.h>
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#ifdef _KERNEL
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#define MAXKPT (PAGE_SIZE/sizeof(vm_offset_t))
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#define vtophys(va) pmap_kextract((vm_offset_t)(va))
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#endif /* _KERNEL */
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/*
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* Pmap stuff
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*/
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struct pv_entry;
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struct pv_chunk;
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struct md_page {
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TAILQ_HEAD(,pv_entry) pv_list;
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vm_memattr_t memattr;
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};
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struct pmap {
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struct mtx pm_mtx;
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TAILQ_HEAD(,pv_chunk) pm_pvchunk; /* list of mappings in pmap */
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uint32_t pm_rid[IA64_VM_MINKERN_REGION];
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struct pmap_statistics pm_stats; /* pmap statistics */
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};
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typedef struct pmap *pmap_t;
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#ifdef _KERNEL
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extern struct pmap kernel_pmap_store;
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#define kernel_pmap (&kernel_pmap_store)
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#define PMAP_LOCK(pmap) mtx_lock(&(pmap)->pm_mtx)
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#define PMAP_LOCK_ASSERT(pmap, type) \
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mtx_assert(&(pmap)->pm_mtx, (type))
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#define PMAP_LOCK_DESTROY(pmap) mtx_destroy(&(pmap)->pm_mtx)
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#define PMAP_LOCK_INIT(pmap) mtx_init(&(pmap)->pm_mtx, "pmap", \
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NULL, MTX_DEF)
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#define PMAP_LOCKED(pmap) mtx_owned(&(pmap)->pm_mtx)
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#define PMAP_MTX(pmap) (&(pmap)->pm_mtx)
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#define PMAP_TRYLOCK(pmap) mtx_trylock(&(pmap)->pm_mtx)
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#define PMAP_UNLOCK(pmap) mtx_unlock(&(pmap)->pm_mtx)
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#endif
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/*
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* For each vm_page_t, there is a list of all currently valid virtual
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* mappings of that page. An entry is a pv_entry_t, the list is pv_list.
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*/
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typedef struct pv_entry {
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vm_offset_t pv_va; /* virtual address for mapping */
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TAILQ_ENTRY(pv_entry) pv_list;
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} *pv_entry_t;
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/*
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* pv_entries are allocated in chunks per-process. This avoids the
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* need to track per-pmap assignments.
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*/
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#define _NPCM 6
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#define _NPCPV 337
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struct pv_chunk {
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pmap_t pc_pmap;
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TAILQ_ENTRY(pv_chunk) pc_list;
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u_long pc_map[_NPCM]; /* bitmap; 1 = free */
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TAILQ_ENTRY(pv_chunk) pc_lru;
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u_long pc_spare[2];
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struct pv_entry pc_pventry[_NPCPV];
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};
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#ifdef _KERNEL
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extern vm_paddr_t phys_avail[];
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extern vm_offset_t virtual_avail;
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extern vm_offset_t virtual_end;
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extern uint64_t pmap_vhpt_base[];
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extern int pmap_vhpt_log2size;
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#define pmap_page_get_memattr(m) ((m)->md.memattr)
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#define pmap_page_is_mapped(m) (!TAILQ_EMPTY(&(m)->md.pv_list))
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#define pmap_page_is_write_mapped(m) (((m)->aflags & PGA_WRITEABLE) != 0)
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#define pmap_mapbios(pa, sz) pmap_mapdev(pa, sz)
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#define pmap_unmapbios(va, sz) pmap_unmapdev(va, sz)
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vm_offset_t pmap_alloc_vhpt(void);
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void pmap_bootstrap(void);
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void pmap_kenter(vm_offset_t va, vm_offset_t pa);
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vm_paddr_t pmap_kextract(vm_offset_t va);
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void pmap_kremove(vm_offset_t);
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void *pmap_mapdev(vm_paddr_t, vm_size_t);
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void pmap_page_set_memattr(vm_page_t, vm_memattr_t);
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vm_offset_t pmap_page_to_va(vm_page_t);
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vm_offset_t pmap_steal_memory(vm_size_t);
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struct pmap *pmap_switch(struct pmap *pmap);
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void pmap_unmapdev(vm_offset_t, vm_size_t);
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#endif /* _KERNEL */
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#endif /* !_MACHINE_PMAP_H_ */
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