sambuc/codezero
1
0
Fork 0
mirror of https://github.com/drasko/codezero.git synced 2026-04-18 01:39:05 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity

Towards implementing fork.

Browse Source 
Issue is that shadow object references from original objects are into
the links rather than the objects.
This commit is contained in:
Bahadir Balban
2008-08-19 18:03:23 +03:00
parent f436b44e81
commit 69db3a04c0
11 changed files with 258 additions and 93 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
tasks/mm0/include/task.h
View File

@@ -87,6 +87,7 @@ struct tcb *find_task(int tid);
struct initdata;
void init_pm(struct initdata *initdata);
struct tcb *task_create(struct task_ids *ids, unsigned int flags);
int send_task_data(l4id_t requester);
#endif /* __TASK_H__ */

13
tasks/mm0/include/vm_area.h
View File

@@ -122,7 +122,7 @@ struct vm_pager {
struct vm_object {
int npages; /* Number of pages in memory */
int refcnt; /* Number of shadows (or vmas) that refer */
struct list_head shadowers; /* List of vm objects that shadow this one */
struct list_head shadowers; /* List of links to the vm object that shadows this one */
struct vm_object *orig_obj; /* Original object that this one shadows */
unsigned int flags; /* Defines the type and flags of the object */
struct list_head list; /* List of all vm objects in memory */
@@ -142,7 +142,13 @@ struct vm_file {
/* To create per-vma vm_object lists */
struct vm_obj_link {
struct list_head list;
struct list_head shref; /* Ref to shadowers by original objects */
/*
* Ref to shadowers by original objects. This could be in the shadow
* object itself, but then we would not be able to reach its link
* when trying to free it.
*/
struct list_head shref;
struct vm_object *obj;
};
@@ -218,6 +224,9 @@ struct page *task_virt_to_page(struct tcb *t, unsigned long virtual);
int validate_task_range(struct tcb *t, unsigned long start,
unsigned long end, unsigned int vmflags);
/* Changes all shadows and their ptes to read-only */
int vm_freeze_shadows(struct tcb *task);
/* Main page fault entry point */
int page_fault_handler(l4id_t tid, fault_kdata_t *fkdata);