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arm64: Add contiguous page flag shifts and constants 

Add the number of pages required to form a contiguous range,
as well as some supporting constants.

Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Jeremy Linton 2015-10-07 12:00:19 -05:00 committed by Catalin Marinas
parent 70e238df1d
commit 2ff4439bb4
1 changed files with 7 additions and 1 deletions
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8
arch/arm64/include/asm/page.h
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@ -20,14 +20,20 @@
#define __ASM_PAGE_H
/* PAGE_SHIFT determines the page size */
/* CONT_SHIFT determines the number of pages which can be tracked together */
#ifdef CONFIG_ARM64_64K_PAGES
#define PAGE_SHIFT 16
#define CONT_SHIFT 5
#else
#define PAGE_SHIFT 12
#define CONT_SHIFT 4
#endif
#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))
#define CONT_SIZE (_AC(1, UL) << (CONT_SHIFT + PAGE_SHIFT))
#define CONT_MASK (~(CONT_SIZE-1))
/*
* The idmap and swapper page tables need some space reserved in the kernel
* image. Both require pgd, pud (4 levels only) and pmd tables to (section)