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sh: Abstract the number of page table levels 

Keep the dimensions of the page tables in a separate header file in
preparation for allowing a three level page table structure.

Signed-off-by: Matt Fleming <matt@console-pimps.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
hifive-unleashed-5.1
Matt Fleming 2009-11-25 22:00:08 +00:00 committed by Paul Mundt
parent 2f7bb2dfed
commit b73c806341
4 changed files with 56 additions and 38 deletions
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24
arch/sh/include/asm/pgalloc.h
View File

@ -4,9 +4,10 @@
#include <linux/quicklist.h>
#include <asm/page.h>
#define QUICK_PGD 0 /* We preserve special mappings over free */
#define QUICK_PT 1 /* Other page table pages that are zero on free */
#include <asm/pgalloc_nopmd.h>
static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
pte_t *pte)
{
@ -20,28 +21,9 @@ static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
}
#define pmd_pgtable(pmd) pmd_page(pmd)
static inline void pgd_ctor(void *x)
{
pgd_t *pgd = x;
memcpy(pgd + USER_PTRS_PER_PGD,
swapper_pg_dir + USER_PTRS_PER_PGD,
(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
}
/*
* Allocate and free page tables.
*/
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
return quicklist_alloc(QUICK_PGD, GFP_KERNEL | __GFP_REPEAT, pgd_ctor);
}
static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
quicklist_free(QUICK_PGD, NULL, pgd);
}
static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
unsigned long address)
{
@ -81,7 +63,7 @@ do { \
static inline void check_pgt_cache(void)
{
quicklist_trim(QUICK_PGD, NULL, 25, 16);
__check_pgt_cache();
quicklist_trim(QUICK_PT, NULL, 25, 16);
}

30
arch/sh/include/asm/pgalloc_nopmd.h 100644
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@ -0,0 +1,30 @@
#ifndef __ASM_SH_PGALLOC_NOPMD_H
#define __ASM_SH_PGALLOC_NOPMD_H
#define QUICK_PGD 0 /* We preserve special mappings over free */
static inline void pgd_ctor(void *x)
{
pgd_t *pgd = x;
memcpy(pgd + USER_PTRS_PER_PGD,
swapper_pg_dir + USER_PTRS_PER_PGD,
(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
}
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
return quicklist_alloc(QUICK_PGD, GFP_KERNEL | __GFP_REPEAT, pgd_ctor);
}
static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
quicklist_free(QUICK_PGD, NULL, pgd);
}
static inline void __check_pgt_cache(void)
{
quicklist_trim(QUICK_PGD, NULL, 25, 16);
}
#endif /* __ASM_SH_PGALLOC_NOPMD_H */

18
arch/sh/include/asm/pgtable.h
View File

@ -12,7 +12,7 @@
#ifndef __ASM_SH_PGTABLE_H
#define __ASM_SH_PGTABLE_H
#include <asm-generic/pgtable-nopmd.h>
#include <asm/pgtable_nopmd.h>
#include <asm/page.h>
#ifndef __ASSEMBLY__
@ -51,28 +51,12 @@ static inline unsigned long long neff_sign_extend(unsigned long val)
#define NPHYS_SIGN (1LL << (NPHYS - 1))
#define NPHYS_MASK (-1LL << NPHYS)
/*
* traditional two-level paging structure
*/
/* PTE bits */
#if defined(CONFIG_X2TLB) || defined(CONFIG_SUPERH64)
# define PTE_MAGNITUDE 3 /* 64-bit PTEs on extended mode SH-X2 TLB */
#else
# define PTE_MAGNITUDE 2 /* 32-bit PTEs */
#endif
#define PTE_SHIFT PAGE_SHIFT
#define PTE_BITS (PTE_SHIFT - PTE_MAGNITUDE)
/* PGD bits */
#define PGDIR_SHIFT (PTE_SHIFT + PTE_BITS)
#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE-1))
/* Entries per level */
#define PTRS_PER_PTE (PAGE_SIZE / (1 << PTE_MAGNITUDE))
#define PTRS_PER_PGD (PAGE_SIZE / sizeof(pgd_t))
#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
#define FIRST_USER_ADDRESS 0
#define PHYS_ADDR_MASK29 0x1fffffff

22
arch/sh/include/asm/pgtable_nopmd.h 100644
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@ -0,0 +1,22 @@
#ifndef __ASM_SH_PGTABLE_NOPMD_H
#define __ASM_SH_PGTABLE_NOPMD_H
#include <asm-generic/pgtable-nopmd.h>
/*
* traditional two-level paging structure
*/
/* PTE bits */
#define PTE_MAGNITUDE 2 /* 32-bit PTEs */
#define PTE_SHIFT PAGE_SHIFT
#define PTE_BITS (PTE_SHIFT - PTE_MAGNITUDE)
/* PGD bits */
#define PGDIR_SHIFT (PTE_SHIFT + PTE_BITS)
#define PTRS_PER_PGD (PAGE_SIZE / (1 << PTE_MAGNITUDE))
#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
#endif /* __ASM_SH_PGTABLE_NOPMD_H */