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/* $OpenBSD: uvm_pglist.c,v 1.30 2009/06/01 17:42:33 ariane Exp $ */
/* $NetBSD: uvm_pglist.c,v 1.13 2001/02/18 21:19:08 chs Exp $ */
/*-
* Copyright (c) 1997 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* uvm_pglist.c: pglist functions
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <uvm/uvm.h>
#ifdef VM_PAGE_ALLOC_MEMORY_STATS
#define STAT_INCR(v) (v)++
#define STAT_DECR(v) do { \
if ((v) == 0) \
printf("%s:%d -- Already 0!\n", __FILE__, __LINE__); \
else \
(v)--; \
} while (0)
u_long uvm_pglistalloc_npages;
#else
#define STAT_INCR(v)
#define STAT_DECR(v)
#endif
/*
* uvm_pglistalloc: allocate a list of pages
*
* => allocated pages are placed at the tail of rlist. rlist is
* assumed to be properly initialized by caller.
* => returns 0 on success or errno on failure
* => XXX: implementation allocates only a single segment, also
* might be able to better advantage of vm_physeg[].
* => doesn't take into account clean non-busy pages on inactive list
* that could be used(?)
* => params:
* size the size of the allocation, rounded to page size.
* low the low address of the allowed allocation range.
* high the high address of the allowed allocation range.
* alignment memory must be aligned to this power-of-two boundary.
* boundary no segment in the allocation may cross this
* power-of-two boundary (relative to zero).
* => flags:
* UVM_PLA_NOWAIT fail if allocation fails
* UVM_PLA_WAITOK wait for memory to become avail if allocation fails
* UVM_PLA_ZERO return zeroed memory
* UVM_PLA_TRY_CONTIG device prefers p-lineair mem
*/
int
uvm_pglistalloc(psize_t size, paddr_t low, paddr_t high, paddr_t alignment,
paddr_t boundary, struct pglist *rlist, int nsegs, int flags)
{
UVMHIST_FUNC("uvm_pglistalloc"); UVMHIST_CALLED(pghist);
KASSERT((alignment & (alignment - 1)) == 0);
KASSERT((boundary & (boundary - 1)) == 0);
KASSERT(!(flags & UVM_PLA_WAITOK) ^ !(flags & UVM_PLA_NOWAIT));
if (size == 0)
return (EINVAL);
/*
* Convert byte addresses to page numbers.
*/
if (alignment < PAGE_SIZE)
alignment = PAGE_SIZE;
low = atop(roundup(low, alignment));
/* Allows for overflow: 0xffff + 1 = 0x0000 */
if ((high & PAGE_MASK) == PAGE_MASK)
high = atop(high) + 1;
else
high = atop(high);
size = atop(round_page(size));
alignment = atop(alignment);
if (boundary < PAGE_SIZE && boundary != 0)
boundary = PAGE_SIZE;
boundary = atop(boundary);
return uvm_pmr_getpages(size, low, high, alignment, boundary, nsegs,
flags, rlist);
}
/*
* uvm_pglistfree: free a list of pages
*
* => pages should already be unmapped
*/
void
uvm_pglistfree(struct pglist *list)
{
struct vm_page *m;
UVMHIST_FUNC("uvm_pglistfree"); UVMHIST_CALLED(pghist);
TAILQ_FOREACH(m, list, pageq) {
KASSERT((m->pg_flags & (PQ_ACTIVE|PQ_INACTIVE)) == 0);
#ifdef DEBUG
if (m->uobject == (void *)0xdeadbeef &&
m->uanon == (void *)0xdeadbeef) {
panic("uvm_pglistfree: freeing free page %p", m);
}
m->uobject = (void *)0xdeadbeef;
m->offset = 0xdeadbeef;
m->uanon = (void *)0xdeadbeef;
#endif
atomic_clearbits_int(&m->pg_flags, PQ_MASK);
}
uvm_pmr_freepageq(list);
}
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