ab73970649
UMA segments at their physical addresses instead of into KVA. This emulates the direct mapping behavior of OEA32 in an ad-hoc way. To make this work properly required sharing the entire kernel PMAP with Open Firmware, so ofw_pmap is transformed into a stub on 64-bit CPUs. Also implement some more tweaks to get more mileage out of our limited amount of KVA, principally by extending KVA into segment 16 until the beginning of the first OFW mapping. Reported by: linimon
104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
/*-
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* Copyright (c) 2003 The FreeBSD Project
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* All rights reserved.
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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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*
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <vm/vm.h>
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#include <vm/vm_page.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_pageout.h>
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#include <vm/vm_extern.h>
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#include <vm/uma.h>
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#include <vm/uma.h>
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#include <vm/uma_int.h>
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#include <machine/md_var.h>
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#include <machine/vmparam.h>
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static int hw_uma_mdpages;
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SYSCTL_INT(_hw, OID_AUTO, uma_mdpages, CTLFLAG_RD, &hw_uma_mdpages, 0,
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"UMA MD pages in use");
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void *
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uma_small_alloc(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
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{
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static vm_pindex_t color;
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void *va;
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vm_page_t m;
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int pflags;
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*flags = UMA_SLAB_PRIV;
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if ((wait & (M_NOWAIT|M_USE_RESERVE)) == M_NOWAIT)
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pflags = VM_ALLOC_INTERRUPT | VM_ALLOC_WIRED;
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else
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pflags = VM_ALLOC_SYSTEM | VM_ALLOC_WIRED;
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if (wait & M_ZERO)
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pflags |= VM_ALLOC_ZERO;
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for (;;) {
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m = vm_page_alloc(NULL, color++, pflags | VM_ALLOC_NOOBJ);
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if (m == NULL) {
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if (wait & M_NOWAIT)
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return (NULL);
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VM_WAIT;
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} else
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break;
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}
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va = (void *) VM_PAGE_TO_PHYS(m);
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if (!hw_direct_map)
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pmap_kenter((vm_offset_t)va, VM_PAGE_TO_PHYS(m));
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if ((wait & M_ZERO) && (m->flags & PG_ZERO) == 0)
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bzero(va, PAGE_SIZE);
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atomic_add_int(&hw_uma_mdpages, 1);
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return (va);
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}
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void
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uma_small_free(void *mem, int size, u_int8_t flags)
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{
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vm_page_t m;
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if (!hw_direct_map)
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pmap_remove(kernel_pmap,(vm_offset_t)mem,
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(vm_offset_t)mem + PAGE_SIZE);
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m = PHYS_TO_VM_PAGE((vm_offset_t)mem);
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m->wire_count--;
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vm_page_free(m);
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atomic_subtract_int(&cnt.v_wire_count, 1);
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atomic_subtract_int(&hw_uma_mdpages, 1);
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}
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