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Update pmap_extract() to handle 1GB page mappings. Some device drivers

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use pmap_extract() rather than pmap_kextract() on direct map addresses.
Thus, pmap_extract() needs to be able to deal with 1GB page mappings if
we are to use 1GB page mappings for the direct map.  (See r197580.)
This commit is contained in:
Alan Cox 2010-10-15 15:23:34 +00:00
parent b56f1ea9d4
commit 353b642ced
1 changed files with 20 additions and 13 deletions
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33
sys/amd64/amd64/pmap.c
View file

@ -1163,26 +1163,33 @@ pmap_is_current(pmap_t pmap)
vm_paddr_t
pmap_extract(pmap_t pmap, vm_offset_t va)
{
vm_paddr_t rtval;
pdp_entry_t *pdpe;
pd_entry_t *pde;
pt_entry_t *pte;
pd_entry_t pde, *pdep;
vm_paddr_t pa;
rtval = 0;
pa = 0;
PMAP_LOCK(pmap);
pdep = pmap_pde(pmap, va);
if (pdep != NULL) {
pde = *pdep;
if (pde) {
if ((pde & PG_PS) != 0)
rtval = (pde & PG_PS_FRAME) | (va & PDRMASK);
else {
pte = pmap_pde_to_pte(pdep, va);
rtval = (*pte & PG_FRAME) | (va & PAGE_MASK);
pdpe = pmap_pdpe(pmap, va);
if (pdpe != NULL && (*pdpe & PG_V) != 0) {
if ((*pdpe & PG_PS) != 0)
pa = (*pdpe & PG_PS_FRAME) | (va & PDPMASK);
else {
pde = pmap_pdpe_to_pde(pdpe, va);
if ((*pde & PG_V) != 0) {
if ((*pde & PG_PS) != 0) {
pa = (*pde & PG_PS_FRAME) |
(va & PDRMASK);
} else {
pte = pmap_pde_to_pte(pde, va);
pa = (*pte & PG_FRAME) |
(va & PAGE_MASK);
}
}
}
}
PMAP_UNLOCK(pmap);
return (rtval);
return (pa);
}
/*