vm_object.c

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#include <core/system.h>
#include <core/arch.h>
#include <core/panic.h>
#include <mm/mm.h>
#include <mm/vm.h>
#include <ds/queue.h>
#include <ds/hashmap.h>
#include <fs/vfs.h>
 
MALLOC_DEFINE(M_VM_OBJECT, "vm-object", "virtual memory object");

void vm_object_incref(struct vm_object *vm_object)
{
    if (!vm_object->ref++ && vm_object->type == VMOBJ_FILE)
        ((struct vnode *) vm_object->p)->ref++;
}

void vm_object_decref(struct vm_object *vm_object)
{
    if (!--vm_object->ref && vm_object->type == VMOBJ_FILE)
        vfs_close((struct vnode *) vm_object->p);
}

int vm_object_page_insert(struct vm_object *vm_object, struct vm_page *vm_page)
{
    size_t off = vm_page->off;
    hash_t hash = hashmap_digest(&off, sizeof(off));
    return hashmap_insert(vm_object->pages, hash, vm_page) ? -ENOMEM : 0;
}