Author: alc
Date: Wed Dec 14 23:57:47 2011
New Revision: 228513
URL: http://svn.freebsd.org/changeset/base/228513
Log:
Create large page mappings in pmap_map().
MFC after: 6 weeks
Modified:
head/sys/i386/i386/pmap.c
Modified: head/sys/i386/i386/pmap.c
==============================================================================
--- head/sys/i386/i386/pmap.c Wed Dec 14 23:26:48 2011 (r228512)
+++ head/sys/i386/i386/pmap.c Wed Dec 14 23:57:47 2011 (r228513)
@@ -1450,12 +1450,40 @@ vm_offset_t
pmap_map(vm_offset_t *virt, vm_paddr_t start, vm_paddr_t end, int prot)
{
vm_offset_t va, sva;
+ vm_paddr_t superpage_offset;
+ pd_entry_t newpde;
- va = sva = *virt;
+ va = *virt;
+ /*
+ * Does the physical address range's size and alignment permit at
+ * least one superpage mapping to be created?
+ */
+ superpage_offset = start & PDRMASK;
+ if ((end - start) - ((NBPDR - superpage_offset) & PDRMASK) >= NBPDR) {
+ /*
+ * Increase the starting virtual address so that its alignment
+ * does not preclude the use of superpage mappings.
+ */
+ if ((va & PDRMASK) < superpage_offset)
+ va = (va & ~PDRMASK) + superpage_offset;
+ else if ((va & PDRMASK) > superpage_offset)
+ va = ((va + PDRMASK) & ~PDRMASK) + superpage_offset;
+ }
+ sva = va;
while (start < end) {
- pmap_kenter(va, start);
- va += PAGE_SIZE;
- start += PAGE_SIZE;
+ if ((start & PDRMASK) == 0 && end - start >= NBPDR &&
+ pseflag) {
+ KASSERT((va & PDRMASK) == 0,
+ ("pmap_map: misaligned va %#x", va));
+ newpde = start | PG_PS | pgeflag | PG_RW | PG_V;
+ pmap_kenter_pde(va, newpde);
+ va += NBPDR;
+ start += NBPDR;
+ } else {
+ pmap_kenter(va, start);
+ va += PAGE_SIZE;
+ start += PAGE_SIZE;
+ }
}
pmap_invalidate_range(kernel_pmap, sva, va);
*virt = va;
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