Line data    Source code

       1           0 : /*
       2             :  * Copyright (c) 2021 EPAM Systems
       3             :  *
       4             :  * SPDX-License-Identifier: Apache-2.0
       5             :  */
       6             : #ifndef __XEN_GENERIC_H__
       7             : #define __XEN_GENERIC_H__
       8             : 
       9             : #include <zephyr/xen/public/xen.h>
      10             : 
      11           0 : #define XEN_PAGE_SIZE           4096
      12           0 : #define XEN_PAGE_SHIFT          12
      13             : 
      14           0 : #define XEN_PFN_UP(x)           (unsigned long)(((x) + XEN_PAGE_SIZE-1) >> XEN_PAGE_SHIFT)
      15           0 : #define XEN_PFN_DOWN(x)         (unsigned long)((x) >> XEN_PAGE_SHIFT)
      16           0 : #define XEN_PFN_PHYS(x)         ((unsigned long)(x) << XEN_PAGE_SHIFT)
      17           0 : #define XEN_PHYS_PFN(x)         (unsigned long)((x) >> XEN_PAGE_SHIFT)
      18             : 
      19           0 : #define xen_to_phys(x)          ((unsigned long) (x))
      20           0 : #define xen_to_virt(x)          ((void *) (x))
      21             : 
      22           0 : #define xen_virt_to_gfn(_virt)  (XEN_PFN_DOWN(xen_to_phys(_virt)))
      23           0 : #define xen_gfn_to_virt(_gfn)   (xen_to_virt(XEN_PFN_PHYS(_gfn)))
      24             : 
      25             : /*
      26             :  * Atomically exchange value on "ptr" position. If value on "ptr" contains
      27             :  * "old", then store and return "new". Otherwise, return the "old" value.
      28             :  */
      29           0 : #define synch_cmpxchg(ptr, old, new) \
      30             : ({ __typeof__(*ptr) stored = old; \
      31             :         __atomic_compare_exchange_n(ptr, &stored, new, 0, __ATOMIC_SEQ_CST, \
      32             :                                 __ATOMIC_SEQ_CST) ? new : old; \
      33             : })
      34             : 
      35             : #endif /* __XEN_GENERIC_H__ */