File: [local] / sys / uvm / uvm_pglist.c (download)
Revision 1.1.1.1 (vendor branch), Tue Mar 4 16:15:24 2008 UTC (16 years, 6 months ago) by nbrk
Branch: OPENBSD_4_2_BASE, MAIN
CVS Tags: jornada-partial-support-wip, HEAD Changes since 1.1: +0 -0 lines
Import of OpenBSD 4.2 release kernel tree with initial code to support
Jornada 720/728, StrongARM 1110-based handheld PC.
At this point kernel roots on NFS and boots into vfs_mountroot() and traps.
What is supported:
- glass console, Jornada framebuffer (jfb) works in 16bpp direct color mode
(needs some palette tweaks for non black/white/blue colors, i think)
- saic, SA11x0 interrupt controller (needs cleanup)
- sacom, SA11x0 UART (supported only as boot console for now)
- SA11x0 GPIO controller fully supported (but can't handle multiple interrupt
handlers on one gpio pin)
- sassp, SSP port on SA11x0 that attaches spibus
- Jornada microcontroller (jmcu) to control kbd, battery, etc throught
the SPI bus (wskbd attaches on jmcu, but not tested)
- tod functions seem work
- initial code for SA-1111 (chip companion) : this is TODO
Next important steps, i think:
- gpio and intc on sa1111
- pcmcia support for sa11x0 (and sa1111 help logic)
- REAL root on nfs when we have PCMCIA support (we may use any of supported pccard NICs)
- root on wd0! (using already supported PCMCIA-ATA)
|
/* $OpenBSD: uvm_pglist.c,v 1.20 2007/04/13 18:57:49 art 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation 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 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
int uvm_pglistalloc_simple(psize_t, paddr_t, paddr_t, struct pglist *);
int
uvm_pglistalloc_simple(psize_t size, paddr_t low, paddr_t high,
struct pglist *rlist)
{
psize_t try;
int psi;
struct vm_page *pg;
int s, todo, idx, pgflidx, error, free_list;
UVMHIST_FUNC("uvm_pglistalloc_simple"); UVMHIST_CALLED(pghist);
#ifdef DEBUG
vm_page_t tp;
#endif
/* Default to "lose". */
error = ENOMEM;
todo = size / PAGE_SIZE;
/*
* Block all memory allocation and lock the free list.
*/
s = uvm_lock_fpageq();
/* Are there even any free pages? */
if (uvmexp.free <= (uvmexp.reserve_pagedaemon + uvmexp.reserve_kernel))
goto out;
for (try = low; try < high; try += PAGE_SIZE) {
/*
* Make sure this is a managed physical page.
*/
if ((psi = vm_physseg_find(atop(try), &idx)) == -1)
continue; /* managed? */
pg = &vm_physmem[psi].pgs[idx];
if (VM_PAGE_IS_FREE(pg) == 0)
continue;
free_list = uvm_page_lookup_freelist(pg);
pgflidx = (pg->pg_flags & PG_ZERO) ? PGFL_ZEROS : PGFL_UNKNOWN;
#ifdef DEBUG
for (tp = TAILQ_FIRST(&uvm.page_free[free_list].pgfl_queues[pgflidx]);
tp != NULL;
tp = TAILQ_NEXT(tp, pageq)) {
if (tp == pg)
break;
}
if (tp == NULL)
panic("uvm_pglistalloc_simple: page not on freelist");
#endif
TAILQ_REMOVE(&uvm.page_free[free_list].pgfl_queues[pgflidx], pg, pageq);
uvmexp.free--;
if (pg->pg_flags & PG_ZERO)
uvmexp.zeropages--;
pg->pg_flags = PG_CLEAN;
pg->uobject = NULL;
pg->uanon = NULL;
pg->pg_version++;
TAILQ_INSERT_TAIL(rlist, pg, pageq);
STAT_INCR(uvm_pglistalloc_npages);
if (--todo == 0) {
error = 0;
goto out;
}
}
out:
/*
* check to see if we need to generate some free pages waking
* the pagedaemon.
*/
if (!error && (uvmexp.free + uvmexp.paging < uvmexp.freemin ||
(uvmexp.free + uvmexp.paging < uvmexp.freetarg &&
uvmexp.inactive < uvmexp.inactarg))) {
wakeup(&uvm.pagedaemon);
}
uvm_unlock_fpageq(s);
if (error)
uvm_pglistfree(rlist);
return (error);
}
/*
* 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).
*/
int
uvm_pglistalloc(size, low, high, alignment, boundary, rlist, nsegs, waitok)
psize_t size;
paddr_t low, high, alignment, boundary;
struct pglist *rlist;
int nsegs, waitok;
{
paddr_t try, idxpa, lastidxpa;
int psi;
struct vm_page *pgs;
int s, tryidx, idx, pgflidx, end, error, free_list;
vm_page_t m;
u_long pagemask;
#ifdef DEBUG
vm_page_t tp;
#endif
UVMHIST_FUNC("uvm_pglistalloc"); UVMHIST_CALLED(pghist);
KASSERT((alignment & (alignment - 1)) == 0);
KASSERT((boundary & (boundary - 1)) == 0);
/*
* Our allocations are always page granularity, so our alignment
* must be, too.
*/
if (alignment < PAGE_SIZE)
alignment = PAGE_SIZE;
if (size == 0)
return (EINVAL);
size = round_page(size);
try = roundup(low, alignment);
if ((nsegs >= size / PAGE_SIZE) && (alignment == PAGE_SIZE) &&
(boundary == 0))
return (uvm_pglistalloc_simple(size, try, high, rlist));
if (boundary != 0 && boundary < size)
return (EINVAL);
pagemask = ~(boundary - 1);
/* Default to "lose". */
error = ENOMEM;
/*
* Block all memory allocation and lock the free list.
*/
s = uvm_lock_fpageq();
/* Are there even any free pages? */
if (uvmexp.free <= (uvmexp.reserve_pagedaemon + uvmexp.reserve_kernel))
goto out;
for (;; try += alignment) {
if (try + size > high) {
/*
* We've run past the allowable range.
*/
goto out;
}
/*
* Make sure this is a managed physical page.
*/
if ((psi = vm_physseg_find(atop(try), &idx)) == -1)
continue; /* managed? */
if (vm_physseg_find(atop(try + size), NULL) != psi)
continue; /* end must be in this segment */
tryidx = idx;
end = idx + (size / PAGE_SIZE);
pgs = vm_physmem[psi].pgs;
/*
* Found a suitable starting page. See of the range is free.
*/
for (; idx < end; idx++) {
if (VM_PAGE_IS_FREE(&pgs[idx]) == 0) {
break;
}
idxpa = VM_PAGE_TO_PHYS(&pgs[idx]);
if (idx > tryidx) {
lastidxpa = VM_PAGE_TO_PHYS(&pgs[idx - 1]);
if ((lastidxpa + PAGE_SIZE) != idxpa) {
/*
* Region not contiguous.
*/
break;
}
if (boundary != 0 &&
((lastidxpa ^ idxpa) & pagemask) != 0) {
/*
* Region crosses boundary.
*/
break;
}
}
}
if (idx == end) {
break;
}
}
#if PGFL_NQUEUES != 2
#error uvm_pglistalloc needs to be updated
#endif
/*
* we have a chunk of memory that conforms to the requested constraints.
*/
idx = tryidx;
while (idx < end) {
m = &pgs[idx];
free_list = uvm_page_lookup_freelist(m);
pgflidx = (m->pg_flags & PG_ZERO) ? PGFL_ZEROS : PGFL_UNKNOWN;
#ifdef DEBUG
for (tp = TAILQ_FIRST(&uvm.page_free[
free_list].pgfl_queues[pgflidx]);
tp != NULL;
tp = TAILQ_NEXT(tp, pageq)) {
if (tp == m)
break;
}
if (tp == NULL)
panic("uvm_pglistalloc: page not on freelist");
#endif
TAILQ_REMOVE(&uvm.page_free[free_list].pgfl_queues[pgflidx],
m, pageq);
uvmexp.free--;
if (m->pg_flags & PG_ZERO)
uvmexp.zeropages--;
m->pg_flags = PG_CLEAN;
m->uobject = NULL;
m->uanon = NULL;
m->pg_version++;
TAILQ_INSERT_TAIL(rlist, m, pageq);
idx++;
STAT_INCR(uvm_pglistalloc_npages);
}
error = 0;
out:
/*
* check to see if we need to generate some free pages waking
* the pagedaemon.
*/
if (uvmexp.free + uvmexp.paging < uvmexp.freemin ||
(uvmexp.free + uvmexp.paging < uvmexp.freetarg &&
uvmexp.inactive < uvmexp.inactarg)) {
wakeup(&uvm.pagedaemon);
}
uvm_unlock_fpageq(s);
return (error);
}
/*
* uvm_pglistfree: free a list of pages
*
* => pages should already be unmapped
*/
void
uvm_pglistfree(struct pglist *list)
{
struct vm_page *m;
int s;
UVMHIST_FUNC("uvm_pglistfree"); UVMHIST_CALLED(pghist);
/*
* Block all memory allocation and lock the free list.
*/
s = uvm_lock_fpageq();
while ((m = TAILQ_FIRST(list)) != NULL) {
KASSERT((m->pg_flags & (PQ_ACTIVE|PQ_INACTIVE)) == 0);
TAILQ_REMOVE(list, m, pageq);
#ifdef DEBUG
if (m->uobject == (void *)0xdeadbeef &&
m->uanon == (void *)0xdeadbeef) {
panic("uvm_pagefree: 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);
atomic_setbits_int(&m->pg_flags, PQ_FREE);
TAILQ_INSERT_TAIL(&uvm.page_free[
uvm_page_lookup_freelist(m)].pgfl_queues[PGFL_UNKNOWN],
m, pageq);
uvmexp.free++;
if (uvmexp.zeropages < UVM_PAGEZERO_TARGET)
uvm.page_idle_zero = vm_page_zero_enable;
STAT_DECR(uvm_pglistalloc_npages);
}
uvm_unlock_fpageq(s);
}