/*
* Free page tables according to isp start virtual address and end virtual
* address.
*/
static void free_mmu_map(struct isp_mmu *mmu, unsigned int start_isp_virt,
unsigned int end_isp_virt)
{
unsigned int pgnr;
unsigned int start, end;
start = (start_isp_virt) & ISP_PAGE_MASK;
end = (end_isp_virt) & ISP_PAGE_MASK;
pgnr = (end - start) >> ISP_PAGE_OFFSET;
mmu_unmap(mmu, start, pgnr);
}
/*
* vm_object_setsize: change the size of a vm_object.
*/
int
vm_object_setsize(struct addrspace *as, struct vm_object *vmo, unsigned npages)
{
int result;
unsigned i;
struct lpage *lp;
KASSERT(vmo != NULL);
KASSERT(vmo->vmo_lpages != NULL);
if (npages < lpage_array_num(vmo->vmo_lpages)) {
for (i=npages; i<lpage_array_num(vmo->vmo_lpages); i++) {
lp = lpage_array_get(vmo->vmo_lpages, i);
if (lp != NULL) {
KASSERT(as != NULL);
/* remove any tlb entry for this mapping */
mmu_unmap(as, vmo->vmo_base+PAGE_SIZE*i);
lpage_destroy(lp);
}
else {
swap_unreserve(1);
}
}
result = lpage_array_setsize(vmo->vmo_lpages, npages);
/* shrinking an array shouldn't fail */
KASSERT(result==0);
}
else if (npages > lpage_array_num(vmo->vmo_lpages)) {
int oldsize = lpage_array_num(vmo->vmo_lpages);
unsigned newpages = npages - oldsize;
result = swap_reserve(newpages);
if (result) {
return result;
}
result = lpage_array_setsize(vmo->vmo_lpages, npages);
if (result) {
swap_unreserve(newpages);
return result;
}
for (i=oldsize; i<npages; i++) {
lpage_array_set(vmo->vmo_lpages, i, NULL);
}
}
return 0;
}
void isp_mmu_unmap(struct isp_mmu *mmu, unsigned int isp_virt,
unsigned int pgnr)
{
mmu_unmap(mmu, isp_virt, pgnr);
}
