diff options
Diffstat (limited to 'xen/include/xen/xencomm.h')
| -rw-r--r-- | xen/include/xen/xencomm.h | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/xen/include/xen/xencomm.h b/xen/include/xen/xencomm.h index 730da7c1f2..3426b8a136 100644 --- a/xen/include/xen/xencomm.h +++ b/xen/include/xen/xencomm.h @@ -66,11 +66,31 @@ static inline unsigned long xencomm_inline_addr(const void *handle) /* Cast a guest handle to the specified type of handle. */ #define guest_handle_cast(hnd, type) ({ \ type *_x = (hnd).p; \ - XEN_GUEST_HANDLE(type) _y; \ + XEN_GUEST_HANDLE_PARAM(type) _y; \ set_xen_guest_handle(_y, _x); \ _y; \ }) +/* Cast a XEN_GUEST_HANDLE to XEN_GUEST_HANDLE_PARAM */ +#define guest_handle_to_param(hnd, type) ({ \ + /* type checking: make sure that the pointers inside \ + * XEN_GUEST_HANDLE and XEN_GUEST_HANDLE_PARAM are of \ + * the same type, then return hnd */ \ + (void)((typeof(&(hnd).p)) 0 == \ + (typeof(&((XEN_GUEST_HANDLE_PARAM(type)) {}).p)) 0); \ + (hnd); \ +}) + +/* Cast a XEN_GUEST_HANDLE_PARAM to XEN_GUEST_HANDLE */ +#define guest_handle_from_param(hnd, type) ({ \ + /* type checking: make sure that the pointers inside \ + * XEN_GUEST_HANDLE and XEN_GUEST_HANDLE_PARAM are of \ + * the same type, then return hnd */ \ + (void)((typeof(&(hnd).p)) 0 == \ + (typeof(&((XEN_GUEST_HANDLE_PARAM(type)) {}).p)) 0); \ + (hnd); \ +}) + /* Since we run in real mode, we can safely access all addresses. That also * means our __routines are identical to our "normal" routines. */ #define guest_handle_okay(hnd, nr) 1 |