diff options
Diffstat (limited to 'sys/vm/vm_glue.c')
| -rw-r--r-- | sys/vm/vm_glue.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/sys/vm/vm_glue.c b/sys/vm/vm_glue.c index ec15d96..2145c0c 100644 --- a/sys/vm/vm_glue.c +++ b/sys/vm/vm_glue.c @@ -388,6 +388,37 @@ retry: #endif /* + * Set up a variable-sized alternate kstack. + */ +void +vm_thread_new_altkstack(struct thread *td, int pages) +{ + + td->td_altkstack = td->td_kstack; + td->td_altkstack_obj = td->td_kstack_obj; + td->td_altkstack_pages = td->td_kstack_pages; + + pmap_new_thread(td, pages); +} + +/* + * Restore the original kstack. + */ +void +vm_thread_dispose_altkstack(struct thread *td) +{ + + pmap_dispose_thread(td); + + td->td_kstack = td->td_altkstack; + td->td_kstack_obj = td->td_altkstack_obj; + td->td_kstack_pages = td->td_altkstack_pages; + td->td_altkstack = 0; + td->td_altkstack_obj = NULL; + td->td_altkstack_pages = 0; +} + +/* * Implement fork's actions on an address space. * Here we arrange for the address space to be copied or referenced, * allocate a user struct (pcb and kernel stack), then call the |
