32 lines
812 B
C
32 lines
812 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __VDSO_PAGE_H
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#define __VDSO_PAGE_H
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#include <uapi/linux/const.h>
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/*
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* PAGE_SHIFT determines the page size.
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*
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* Note: This definition is required because PAGE_SHIFT is used
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* in several places throuout the codebase.
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*/
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#define PAGE_SHIFT CONFIG_PAGE_SHIFT
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#define PAGE_SIZE (_AC(1,UL) << CONFIG_PAGE_SHIFT)
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#if !defined(CONFIG_64BIT)
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/*
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* Applies only to 32-bit architectures.
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*
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* Subtle: (1 << CONFIG_PAGE_SHIFT) is an int, not an unsigned long.
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* So if we assign PAGE_MASK to a larger type it gets extended the
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* way we want (i.e. with 1s in the high bits) while masking a
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* 64-bit value such as phys_addr_t.
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*/
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#define PAGE_MASK (~((1 << CONFIG_PAGE_SHIFT) - 1))
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#else
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#define PAGE_MASK (~(PAGE_SIZE - 1))
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#endif
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#endif /* __VDSO_PAGE_H */
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