pgalloc.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _ASM_PGALLOC_H
 3#define _ASM_PGALLOC_H
 4
 5#include <linux/gfp.h>
 6#include <linux/mm.h>
 7#include <linux/threads.h>
 8#include <asm/processor.h>
 9#include <asm/fixmap.h>
10
11#include <asm/cache.h>
12
13#define __HAVE_ARCH_PMD_ALLOC_ONE
14#include <asm-generic/pgalloc.h>
15
16/* Allocate the top level pgd (page directory) */
17static inline pgd_t *pgd_alloc(struct mm_struct *mm)
18{
19	return __pgd_alloc(mm, PGD_TABLE_ORDER);
20}
21
22#if CONFIG_PGTABLE_LEVELS == 3
23
24/* Three Level Page Table Support for pmd's */
25
26static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
27{
28	set_pud(pud, __pud((PxD_FLAG_PRESENT | PxD_FLAG_VALID) +
29			(__u32)(__pa((unsigned long)pmd) >> PxD_VALUE_SHIFT)));
30}
31
32static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
33{
34	struct ptdesc *ptdesc;
35	gfp_t gfp = GFP_PGTABLE_USER;
36
37	if (mm == &init_mm)
38		gfp = GFP_PGTABLE_KERNEL;
39	ptdesc = pagetable_alloc(gfp, PMD_TABLE_ORDER);
40	if (!ptdesc)
41		return NULL;
42	if (!pagetable_pmd_ctor(mm, ptdesc)) {
43		pagetable_free(ptdesc);
44		return NULL;
45	}
46	return ptdesc_address(ptdesc);
47}
48#endif
49
50static inline void
51pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
52{
53	set_pmd(pmd, __pmd((PxD_FLAG_PRESENT | PxD_FLAG_VALID)
54		+ (__u32)(__pa((unsigned long)pte) >> PxD_VALUE_SHIFT)));
55}
56
57#define pmd_populate(mm, pmd, pte_page) \
58	pmd_populate_kernel(mm, pmd, page_address(pte_page))
59
60#endif