kernel/vm: Add page_get and make _page_get static

Fixes: phoenix-rtos/phoenix-rtos-project#1074

vm/map.c

@@ -945,8 +945,9 @@ void vm_mapDestroy(process_t *p, vm_map_t *map)
 	rbnode_t *n;
 	int i = 0;
 
-	while ((a = pmap_destroy(&map->pmap, &i)))
-		vm_pageFree(_page_get(a));
+	while ((a = pmap_destroy(&map->pmap, &i))) {
+		vm_pageFree(page_get(a));
+	}
 
 	vm_munmap(map_common.kmap, map->pmap.pmapv, SIZE_PDIR);
 	vm_pageFree(map->pmap.pmapp);

vm/object.c

@@ -197,8 +197,9 @@ page_t *vm_objectPage(vm_map_t *map, amap_t **amap, vm_object_t *o, void *vaddr,
 	if (o == NULL)
 		return vm_pageAlloc(SIZE_PAGE, PAGE_OWNER_APP);
 
-	if (o == (void *)-1)
-		return _page_get(offs);
+	if (o == (void *)-1) {
+		return page_get(offs);
+	}
 
 	proc_lockSet(&object_common.lock);
 

vm/page-nommu.c

@@ -118,7 +118,13 @@ int page_map(pmap_t *pmap, void *vaddr, addr_t pa, int attr)
 }
 
 
-page_t *_page_get(addr_t addr)
+static page_t *_page_get(addr_t addr)
+{
+	return NULL;
+}
+
+
+page_t *page_get(addr_t addr)
 {
 	return NULL;
 }

vm/page.c

@@ -174,7 +174,7 @@ static int _page_get_cmp(void *key, void *item)
 }
 
 
-page_t *_page_get(addr_t addr)
+static page_t *_page_get(addr_t addr)
 {
 	page_t *p;
 	size_t np = (pages.freesz + pages.allocsz) / SIZE_PAGE;
@@ -186,6 +186,16 @@ page_t *_page_get(addr_t addr)
 }
 
 
+page_t *page_get(addr_t addr)
+{
+	page_t *p;
+	proc_lockSet(&pages.lock);
+	p = _page_get(addr);
+	proc_lockClear(&pages.lock);
+	return p;
+}
+
+
 void vm_pageFreeAt(pmap_t *pmap, void *vaddr)
 {
 	proc_lockSet(&pages.lock);

vm/page.h

@@ -30,7 +30,7 @@ extern void _page_free(page_t *lh);
 extern void vm_pageFree(page_t *lh);
 
 
-extern page_t *_page_get(addr_t addr);
+extern page_t *page_get(addr_t addr);
 
 
 extern void vm_pageFreeAt(pmap_t *pmap, void *vaddr);