140 lines
3.8 KiB
C
Executable file
140 lines
3.8 KiB
C
Executable file
/*
|
|
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* vineetg: June 2011
|
|
* -"/proc/meminfo | grep PageTables" kept on increasing
|
|
* Recently added pgtable dtor was not getting called.
|
|
*
|
|
* vineetg: May 2011
|
|
* -Variable pg-sz means that Page Tables could be variable sized themselves
|
|
* So calculate it based on addr traversal split [pgd-bits:pte-bits:xxx]
|
|
* -Page Table size capped to max 1 to save memory - hence verified.
|
|
* -Since these deal with constants, gcc compile-time optimizes them.
|
|
*
|
|
* vineetg: Nov 2010
|
|
* -Added pgtable ctor/dtor used for pgtable mem accounting
|
|
*
|
|
* vineetg: April 2010
|
|
* -Switched pgtable_t from being struct page * to unsigned long
|
|
* =Needed so that Page Table allocator (pte_alloc_one) is not forced to
|
|
* to deal with struct page. Thay way in future we can make it allocate
|
|
* multiple PG Tbls in one Page Frame
|
|
* =sweet side effect is avoiding calls to ugly page_address( ) from the
|
|
* pg-tlb allocator sub-sys (pte_alloc_one, ptr_free, pmd_populate
|
|
*
|
|
* Amit Bhor, Sameer Dhavale: Codito Technologies 2004
|
|
*/
|
|
|
|
#ifndef _ASM_ARC_PGALLOC_H
|
|
#define _ASM_ARC_PGALLOC_H
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/log2.h>
|
|
|
|
static inline void
|
|
pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
|
|
{
|
|
pmd_set(pmd, pte);
|
|
}
|
|
|
|
static inline void
|
|
pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t ptep)
|
|
{
|
|
pmd_set(pmd, (pte_t *) ptep);
|
|
}
|
|
|
|
static inline int __get_order_pgd(void)
|
|
{
|
|
return get_order(PTRS_PER_PGD * sizeof(pgd_t));
|
|
}
|
|
|
|
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
|
|
{
|
|
int num, num2;
|
|
pgd_t *ret = (pgd_t *) __get_free_pages(GFP_KERNEL, __get_order_pgd());
|
|
|
|
if (ret) {
|
|
num = USER_PTRS_PER_PGD + USER_KERNEL_GUTTER / PGDIR_SIZE;
|
|
memzero(ret, num * sizeof(pgd_t));
|
|
|
|
num2 = VMALLOC_SIZE / PGDIR_SIZE;
|
|
memcpy(ret + num, swapper_pg_dir + num, num2 * sizeof(pgd_t));
|
|
|
|
memzero(ret + num + num2,
|
|
(PTRS_PER_PGD - num - num2) * sizeof(pgd_t));
|
|
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
|
|
{
|
|
free_pages((unsigned long)pgd, __get_order_pgd());
|
|
}
|
|
|
|
|
|
/*
|
|
* With software-only page-tables, addr-split for traversal is tweakable and
|
|
* that directly governs how big tables would be at each level.
|
|
* Further, the MMU page size is configurable.
|
|
* Thus we need to programatically assert the size constraint
|
|
* All of this is const math, allowing gcc to do constant folding/propagation.
|
|
*/
|
|
|
|
static inline int __get_order_pte(void)
|
|
{
|
|
return get_order(PTRS_PER_PTE * sizeof(pte_t));
|
|
}
|
|
|
|
static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
|
|
unsigned long address)
|
|
{
|
|
pte_t *pte;
|
|
|
|
pte = (pte_t *) __get_free_pages(GFP_KERNEL | __GFP_ZERO,
|
|
__get_order_pte());
|
|
|
|
return pte;
|
|
}
|
|
|
|
static inline pgtable_t
|
|
pte_alloc_one(struct mm_struct *mm, unsigned long address)
|
|
{
|
|
pgtable_t pte_pg;
|
|
struct page *page;
|
|
|
|
pte_pg = (pgtable_t)__get_free_pages(GFP_KERNEL, __get_order_pte());
|
|
if (!pte_pg)
|
|
return 0;
|
|
memzero((void *)pte_pg, PTRS_PER_PTE * sizeof(pte_t));
|
|
page = virt_to_page(pte_pg);
|
|
if (!pgtable_page_ctor(page)) {
|
|
__free_page(page);
|
|
return 0;
|
|
}
|
|
|
|
return pte_pg;
|
|
}
|
|
|
|
static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
|
|
{
|
|
free_pages((unsigned long)pte, __get_order_pte()); /* takes phy addr */
|
|
}
|
|
|
|
static inline void pte_free(struct mm_struct *mm, pgtable_t ptep)
|
|
{
|
|
pgtable_page_dtor(virt_to_page(ptep));
|
|
free_pages((unsigned long)ptep, __get_order_pte());
|
|
}
|
|
|
|
#define __pte_free_tlb(tlb, pte, addr) pte_free((tlb)->mm, pte)
|
|
|
|
#define check_pgt_cache() do { } while (0)
|
|
#define pmd_pgtable(pmd) ((pgtable_t) pmd_page_vaddr(pmd))
|
|
|
|
#endif /* _ASM_ARC_PGALLOC_H */
|