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Introduce pmap_change_attr_locked().

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This commit is contained in:
alc 2008-08-07 04:56:29 +00:00
parent b5d4cdc75b
commit a08d055d40
1 changed files with 18 additions and 17 deletions
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35
sys/amd64/amd64/pmap.c
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@ -221,6 +221,7 @@ static pv_entry_t pmap_pvh_remove(struct md_page *pvh, pmap_t pmap,
vm_offset_t va);
static int pmap_pvh_wired_mappings(struct md_page *pvh, int count);
static int pmap_change_attr_locked(vm_offset_t va, vm_size_t size, int mode);
static boolean_t pmap_demote_pde(pmap_t pmap, pd_entry_t *pde, vm_offset_t va);
static boolean_t pmap_demote_pdpe(pmap_t pmap, pdp_entry_t *pdpe,
vm_offset_t va);
@ -4418,6 +4419,17 @@ pmap_demote_pdpe(pmap_t pmap, pdp_entry_t *pdpe, vm_offset_t va)
int
pmap_change_attr(vm_offset_t va, vm_size_t size, int mode)
{
int error;
PMAP_LOCK(kernel_pmap);
error = pmap_change_attr_locked(va, size, mode);
PMAP_UNLOCK(kernel_pmap);
return (error);
}
static int
pmap_change_attr_locked(vm_offset_t va, vm_size_t size, int mode)
{
vm_offset_t base, offset, tmpva;
pdp_entry_t *pdpe;
@ -4426,6 +4438,7 @@ pmap_change_attr(vm_offset_t va, vm_size_t size, int mode)
int cache_bits_pte, cache_bits_pde;
boolean_t changed;
PMAP_LOCK_ASSERT(kernel_pmap, MA_OWNED);
base = trunc_page(va);
offset = va & PAGE_MASK;
size = roundup(offset + size, PAGE_SIZE);
@ -4444,13 +4457,10 @@ pmap_change_attr(vm_offset_t va, vm_size_t size, int mode)
* Pages that aren't mapped aren't supported. Also break down 2MB pages
* into 4KB pages if required.
*/
PMAP_LOCK(kernel_pmap);
for (tmpva = base; tmpva < base + size; ) {
pdpe = pmap_pdpe(kernel_pmap, tmpva);
if (*pdpe == 0) {
PMAP_UNLOCK(kernel_pmap);
if (*pdpe == 0)
return (EINVAL);
}
if (*pdpe & PG_PS) {
/*
* If the current 1GB page already has the required
@ -4474,16 +4484,12 @@ pmap_change_attr(vm_offset_t va, vm_size_t size, int mode)
tmpva += NBPDP;
continue;
}
if (!pmap_demote_pdpe(kernel_pmap, pdpe, tmpva)) {
PMAP_UNLOCK(kernel_pmap);
if (!pmap_demote_pdpe(kernel_pmap, pdpe, tmpva))
return (ENOMEM);
}
}
pde = pmap_pdpe_to_pde(pdpe, tmpva);
if (*pde == 0) {
PMAP_UNLOCK(kernel_pmap);
if (*pde == 0)
return (EINVAL);
}
if (*pde & PG_PS) {
/*
* If the current 2MB page already has the required
@ -4507,19 +4513,14 @@ pmap_change_attr(vm_offset_t va, vm_size_t size, int mode)
tmpva += NBPDR;
continue;
}
if (!pmap_demote_pde(kernel_pmap, pde, tmpva)) {
PMAP_UNLOCK(kernel_pmap);
if (!pmap_demote_pde(kernel_pmap, pde, tmpva))
return (ENOMEM);
}
}
pte = vtopte(tmpva);
if (*pte == 0) {
PMAP_UNLOCK(kernel_pmap);
if (*pte == 0)
return (EINVAL);
}
tmpva += PAGE_SIZE;
}
PMAP_UNLOCK(kernel_pmap);
/*
* Ok, all the pages exist, so run through them updating their