Zephyr API Documentation
4.0.0-rc2
A Scalable Open Source RTOS
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generic.h
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/*
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* Copyright (c) 2021 EPAM Systems
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef __XEN_GENERIC_H__
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#define __XEN_GENERIC_H__
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#include <
zephyr/xen/public/xen.h
>
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#define XEN_PAGE_SIZE 4096
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#define XEN_PAGE_SHIFT 12
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#define XEN_PFN_UP(x) (unsigned long)(((x) + XEN_PAGE_SIZE-1) >> XEN_PAGE_SHIFT)
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#define XEN_PFN_DOWN(x) (unsigned long)((x) >> XEN_PAGE_SHIFT)
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#define XEN_PFN_PHYS(x) ((unsigned long)(x) << XEN_PAGE_SHIFT)
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#define XEN_PHYS_PFN(x) (unsigned long)((x) >> XEN_PAGE_SHIFT)
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#define xen_to_phys(x) ((unsigned long) (x))
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#define xen_to_virt(x) ((void *) (x))
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#define xen_virt_to_gfn(_virt) (XEN_PFN_DOWN(xen_to_phys(_virt)))
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#define xen_gfn_to_virt(_gfn) (xen_to_virt(XEN_PFN_PHYS(_gfn)))
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/*
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* Atomically exchange value on "ptr" position. If value on "ptr" contains
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* "old", then store and return "new". Otherwise, return the "old" value.
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*/
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#define synch_cmpxchg(ptr, old, new) \
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({ __typeof__(*ptr) stored = old; \
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__atomic_compare_exchange_n(ptr, &stored, new, 0, __ATOMIC_SEQ_CST, \
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__ATOMIC_SEQ_CST) ? new : old; \
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})
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#endif
/* __XEN_GENERIC_H__ */
xen.h
zephyr
xen
generic.h
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