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Optimize vmapbuf().

This commit is contained in:
mycroft 1994-06-29 02:32:56 +00:00
parent 88c2dbd163
commit 91e5666a46
1 changed files with 12 additions and 13 deletions
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25
sys/arch/i386/i386/vm_machdep.c
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@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91
* $Id: vm_machdep.c,v 1.28 1994/06/29 01:54:09 mycroft Exp $
* $Id: vm_machdep.c,v 1.29 1994/06/29 02:32:56 mycroft Exp $
*/
/*
@ -370,12 +370,12 @@ extern vm_map_t phys_map;
* (a name with only slightly more meaning than "kernelmap")
*/
vmapbuf(bp, len)
register struct buf *bp;
struct buf *bp;
vm_size_t len;
{
vm_offset_t faddr, taddr, off;
struct pmap *fpmap, *tpmap;
register vm_offset_t pa;
struct pte *fpte, *tpte;
struct pte *pmap_pte __P((pmap_t, vm_offset_t));
if ((bp->b_flags & B_PHYS) == 0)
panic("vmapbuf");
@ -384,15 +384,14 @@ vmapbuf(bp, len)
len = round_page(off + len);
taddr = kmem_alloc_wait(phys_map, len);
bp->b_data = (caddr_t)(taddr + off);
fpmap = vm_map_pmap(&bp->b_proc->p_vmspace->vm_map);
tpmap = vm_map_pmap(phys_map);
/*
* The region is locked, so we expect that pmap_pte() will return
* non-NULL.
*/
fpte = pmap_pte(vm_map_pmap(&bp->b_proc->p_vmspace->vm_map), faddr);
tpte = pmap_pte(vm_map_pmap(phys_map), taddr);
do {
pa = pmap_extract(fpmap, faddr);
if (pa == 0)
panic("vmapbuf: null page frame");
pmap_enter(tpmap, taddr, pa, VM_PROT_READ|VM_PROT_WRITE, TRUE);
faddr += PAGE_SIZE;
taddr += PAGE_SIZE;
*tpte++ = *fpte++;
len -= PAGE_SIZE;
} while (len);
}
@ -402,7 +401,7 @@ vmapbuf(bp, len)
* We also invalidate the TLB entries and restore the original b_addr.
*/
vunmapbuf(bp, len)
register struct buf *bp;
struct buf *bp;
vm_size_t len;
{
vm_offset_t addr, off;