| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef __VDSO_PAGE_H |
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| 3 | #define __VDSO_PAGE_H |
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| 4 | |
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| 5 | #include <uapi/linux/const.h> |
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| 6 | |
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| 7 | /* |
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| 8 | * PAGE_SHIFT determines the page size. |
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| 9 | * |
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| 10 | * Note: This definition is required because PAGE_SHIFT is used |
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| 11 | * in several places throughout the codebase. |
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| 12 | */ |
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| 13 | #define PAGE_SHIFT CONFIG_PAGE_SHIFT |
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| 14 | |
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| 15 | #define PAGE_SIZE (_AC(1,UL) << CONFIG_PAGE_SHIFT) |
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| 16 | |
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| 17 | #if !defined(CONFIG_64BIT) |
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| 18 | /* |
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| 19 | * Applies only to 32-bit architectures. |
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| 20 | * |
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| 21 | * Subtle: (1 << CONFIG_PAGE_SHIFT) is an int, not an unsigned long. |
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| 22 | * So if we assign PAGE_MASK to a larger type it gets extended the |
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| 23 | * way we want (i.e. with 1s in the high bits) while masking a |
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| 24 | * 64-bit value such as phys_addr_t. |
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| 25 | */ |
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| 26 | #define PAGE_MASK (~((1 << CONFIG_PAGE_SHIFT) - 1)) |
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| 27 | #else |
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| 28 | #define PAGE_MASK (~(PAGE_SIZE - 1)) |
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| 29 | #endif |
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| 30 | |
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| 31 | #endif /* __VDSO_PAGE_H */ |
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| 32 | |
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