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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*
* 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
* deal with struct page. That 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)
{
/*
* The cast to long below is OK in 32-bit PAE40 regime with long long pte
* Despite "wider" pte, the pte table needs to be in non-PAE low memory
* as all higher levels can only hold long pointers.
*
* The cast itself is needed given simplistic definition of set_pmd()
*/
set_pmd(pmd, __pmd((unsigned long)pte));
}
static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t pte_page)
{
set_pmd(pmd, __pmd((unsigned long)page_address(pte_page)));
}
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
pgd_t *ret = (pgd_t *) __get_free_page(GFP_KERNEL);
if (ret) {
int num, num2;
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_page((unsigned long)pgd);
}
static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
{
pte_t *pte;
pte = (pte_t *) __get_free_page(GFP_KERNEL | __GFP_ZERO);
return pte;
}
static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
{
struct page *page;
page = (pgtable_t)alloc_page(GFP_KERNEL | __GFP_ZERO | __GFP_ACCOUNT);
if (!page)
return NULL;
if (!pgtable_pte_page_ctor(page)) {
__free_page(page);
return NULL;
}
return page;
}
static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
{
free_page((unsigned long)pte);
}
static inline void pte_free(struct mm_struct *mm, pgtable_t pte_page)
{
pgtable_pte_page_dtor(pte_page);
__free_page(pte_page);
}
#define __pte_free_tlb(tlb, pte, addr) pte_free((tlb)->mm, pte)
#endif /* _ASM_ARC_PGALLOC_H */
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