1 /* 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 #define XEN_PAGE_SIZE 4096 12 #define XEN_PAGE_SHIFT 12 13 14 #define XEN_PFN_UP(x) (unsigned long)(((x) + XEN_PAGE_SIZE-1) >> XEN_PAGE_SHIFT) 15 #define XEN_PFN_DOWN(x) (unsigned long)((x) >> XEN_PAGE_SHIFT) 16 #define XEN_PFN_PHYS(x) ((unsigned long)(x) << XEN_PAGE_SHIFT) 17 #define XEN_PHYS_PFN(x) (unsigned long)((x) >> XEN_PAGE_SHIFT) 18 19 #define xen_to_phys(x) ((unsigned long) (x)) 20 #define xen_to_virt(x) ((void *) (x)) 21 22 #define xen_virt_to_gfn(_virt) (XEN_PFN_DOWN(xen_to_phys(_virt))) 23 #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 #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__ */ 36
