/* ARGSUSED */
int
sys_mincore(struct lwp *l, const struct sys_mincore_args *uap,
register_t *retval)
{
/* {
syscallarg(void *) addr;
syscallarg(size_t) len;
syscallarg(char *) vec;
} */
struct proc *p = l->l_proc;
struct vm_page *pg;
char *vec, pgi;
struct uvm_object *uobj;
struct vm_amap *amap;
struct vm_anon *anon;
struct vm_map_entry *entry;
vaddr_t start, end, lim;
struct vm_map *map;
vsize_t len;
int error = 0, npgs;
map = &p->p_vmspace->vm_map;
start = (vaddr_t)SCARG(uap, addr);
len = SCARG(uap, len);
vec = SCARG(uap, vec);
if (start & PAGE_MASK)
return EINVAL;
len = round_page(len);
end = start + len;
if (end <= start)
return EINVAL;
/*
* Lock down vec, so our returned status isn't outdated by
* storing the status byte for a page.
*/
npgs = len >> PAGE_SHIFT;
error = uvm_vslock(p->p_vmspace, vec, npgs, VM_PROT_WRITE);
if (error) {
return error;
}
vm_map_lock_read(map);
if (uvm_map_lookup_entry(map, start, &entry) == false) {
error = ENOMEM;
goto out;
}
for (/* nothing */;
entry != &map->header && entry->start < end;
entry = entry->next) {
KASSERT(!UVM_ET_ISSUBMAP(entry));
KASSERT(start >= entry->start);
/* Make sure there are no holes. */
if (entry->end < end &&
(entry->next == &map->header ||
entry->next->start > entry->end)) {
error = ENOMEM;
goto out;
}
lim = end < entry->end ? end : entry->end;
/*
* Special case for objects with no "real" pages. Those
* are always considered resident (mapped devices).
*/
if (UVM_ET_ISOBJ(entry)) {
KASSERT(!UVM_OBJ_IS_KERN_OBJECT(entry->object.uvm_obj));
if (UVM_OBJ_IS_DEVICE(entry->object.uvm_obj)) {
for (/* nothing */; start < lim;
start += PAGE_SIZE, vec++)
subyte(vec, 1);
continue;
}
}
amap = entry->aref.ar_amap; /* upper layer */
uobj = entry->object.uvm_obj; /* lower layer */
if (amap != NULL)
amap_lock(amap);
if (uobj != NULL)
mutex_enter(uobj->vmobjlock);
for (/* nothing */; start < lim; start += PAGE_SIZE, vec++) {
pgi = 0;
if (amap != NULL) {
/* Check the upper layer first. */
anon = amap_lookup(&entry->aref,
start - entry->start);
/* Don't need to lock anon here. */
if (anon != NULL && anon->an_page != NULL) {
/*
* Anon has the page for this entry
* offset.
*/
pgi = 1;
}
}
if (uobj != NULL && pgi == 0) {
/* Check the lower layer. */
pg = uvm_pagelookup(uobj,
entry->offset + (start - entry->start));
if (pg != NULL) {
/*
* Object has the page for this entry
* offset.
*/
pgi = 1;
}
}
(void) subyte(vec, pgi);
}
if (uobj != NULL)
mutex_exit(uobj->vmobjlock);
if (amap != NULL)
amap_unlock(amap);
}
out:
vm_map_unlock_read(map);
uvm_vsunlock(p->p_vmspace, SCARG(uap, vec), npgs);
return error;
}
/* ARGSUSED */
int
sys_mincore(struct proc *p, void *v, register_t *retval)
{
struct sys_mincore_args /* {
syscallarg(void *) addr;
syscallarg(size_t) len;
syscallarg(char *) vec;
} */ *uap = v;
vm_page_t m;
char *vec, pgi;
struct uvm_object *uobj;
struct vm_amap *amap;
struct vm_anon *anon;
vm_map_entry_t entry;
vaddr_t start, end, lim;
vm_map_t map;
vsize_t len, npgs;
int error = 0;
map = &p->p_vmspace->vm_map;
start = (vaddr_t)SCARG(uap, addr);
len = SCARG(uap, len);
vec = SCARG(uap, vec);
if (start & PAGE_MASK)
return (EINVAL);
len = round_page(len);
end = start + len;
if (end <= start)
return (EINVAL);
npgs = len >> PAGE_SHIFT;
/*
* Lock down vec, so our returned status isn't outdated by
* storing the status byte for a page.
*/
if ((error = uvm_vslock(p, vec, npgs, VM_PROT_WRITE)) != 0)
return (error);
vm_map_lock_read(map);
if (uvm_map_lookup_entry(map, start, &entry) == FALSE) {
error = ENOMEM;
goto out;
}
for (/* nothing */;
entry != &map->header && entry->start < end;
entry = entry->next) {
KASSERT(!UVM_ET_ISSUBMAP(entry));
KASSERT(start >= entry->start);
/* Make sure there are no holes. */
if (entry->end < end &&
(entry->next == &map->header ||
entry->next->start > entry->end)) {
error = ENOMEM;
goto out;
}
lim = end < entry->end ? end : entry->end;
/*
* Special case for objects with no "real" pages. Those
* are always considered resident (mapped devices).
*/
if (UVM_ET_ISOBJ(entry)) {
KASSERT(!UVM_OBJ_IS_KERN_OBJECT(entry->object.uvm_obj));
if (entry->object.uvm_obj->pgops->pgo_releasepg
== NULL) {
pgi = 1;
for (/* nothing */; start < lim;
start += PAGE_SIZE, vec++)
copyout(&pgi, vec, sizeof(char));
continue;
}
}
amap = entry->aref.ar_amap; /* top layer */
uobj = entry->object.uvm_obj; /* bottom layer */
if (uobj != NULL)
simple_lock(&uobj->vmobjlock);
for (/* nothing */; start < lim; start += PAGE_SIZE, vec++) {
pgi = 0;
if (amap != NULL) {
/* Check the top layer first. */
anon = amap_lookup(&entry->aref,
start - entry->start);
/* Don't need to lock anon here. */
if (anon != NULL && anon->an_page != NULL) {
/*
* Anon has the page for this entry
* offset.
*/
pgi = 1;
}
}
if (uobj != NULL && pgi == 0) {
/* Check the bottom layer. */
m = uvm_pagelookup(uobj,
entry->offset + (start - entry->start));
if (m != NULL) {
/*
* Object has the page for this entry
* offset.
*/
pgi = 1;
}
}
copyout(&pgi, vec, sizeof(char));
}
if (uobj != NULL)
simple_unlock(&uobj->vmobjlock);
}
out:
vm_map_unlock_read(map);
uvm_vsunlock(p, SCARG(uap, vec), npgs);
return (error);
}