78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* include/asm-xtensa/pgalloc.h
|
|
*
|
|
* Copyright (C) 2001-2007 Tensilica Inc.
|
|
*/
|
|
|
|
#ifndef _XTENSA_PGALLOC_H
|
|
#define _XTENSA_PGALLOC_H
|
|
|
|
#include <linux/highmem.h>
|
|
#include <linux/slab.h>
|
|
|
|
/*
|
|
* Allocating and freeing a pmd is trivial: the 1-entry pmd is
|
|
* inside the pgd, so has no extra memory associated with it.
|
|
*/
|
|
|
|
#define pmd_populate_kernel(mm, pmdp, ptep) \
|
|
(pmd_val(*(pmdp)) = ((unsigned long)ptep))
|
|
#define pmd_populate(mm, pmdp, page) \
|
|
(pmd_val(*(pmdp)) = ((unsigned long)page_to_virt(page)))
|
|
#define pmd_pgtable(pmd) pmd_page(pmd)
|
|
|
|
static inline pgd_t*
|
|
pgd_alloc(struct mm_struct *mm)
|
|
{
|
|
return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER);
|
|
}
|
|
|
|
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 *ptep;
|
|
int i;
|
|
|
|
ptep = (pte_t *)__get_free_page(GFP_KERNEL);
|
|
if (!ptep)
|
|
return NULL;
|
|
for (i = 0; i < 1024; i++)
|
|
pte_clear(NULL, 0, ptep + i);
|
|
return ptep;
|
|
}
|
|
|
|
static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
|
|
{
|
|
pte_t *pte;
|
|
struct page *page;
|
|
|
|
pte = pte_alloc_one_kernel(mm);
|
|
if (!pte)
|
|
return NULL;
|
|
page = virt_to_page(pte);
|
|
if (!pgtable_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)
|
|
{
|
|
pgtable_page_dtor(pte);
|
|
__free_page(pte);
|
|
}
|
|
#define pmd_pgtable(pmd) pmd_page(pmd)
|
|
|
|
#endif /* _XTENSA_PGALLOC_H */
|