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__ */
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