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arm64: Introduce VA_BITS and translation level options

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This patch adds virtual address space size and a level of translation
tables to kernel configuration. It facilicates introduction of
different MMU options, such as 4KB + 4 levels, 16KB + 4 levels and
64KB + 3 levels, easily.

The idea is based on the discussion with Catalin Marinas:
http://www.spinics.net/linux/lists/arm-kernel/msg319552.html

Signed-off-by: Jungseok Lee <jays.lee@samsung.com>
Reviewed-by: Sungjinn Chung <sungjinn.chung@samsung.com>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Jungseok Lee <jungseoklee85@gmail.com>
This commit is contained in:
Jungseok Lee
2014-05-12 10:40:38 +01:00
committed by Catalin Marinas
parent 7edd88ad7e
commit e41ceed035
7 changed files with 54 additions and 15 deletions
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4
arch/arm64/include/asm/pgalloc.h
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@@ -26,7 +26,7 @@
#define check_pgt_cache() do { } while (0)
#ifndef CONFIG_ARM64_64K_PAGES
#ifndef CONFIG_ARM64_2_LEVELS
static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
{
@@ -44,7 +44,7 @@ static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE));
}
#endif /* CONFIG_ARM64_64K_PAGES */
#endif /* CONFIG_ARM64_2_LEVELS */
extern pgd_t *pgd_alloc(struct mm_struct *mm);
extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);