mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-30 14:06:51 +07:00
116 lines
2.3 KiB
C
116 lines
2.3 KiB
C
/*
|
|
* linux/arch/arm/mm/pgd.c
|
|
*
|
|
* Copyright (C) 1998-2005 Russell King
|
|
*
|
|
* 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.
|
|
*/
|
|
#include <linux/mm.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/highmem.h>
|
|
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/page.h>
|
|
#include <asm/tlbflush.h>
|
|
|
|
#include "mm.h"
|
|
|
|
/*
|
|
* need to get a 16k page for level 1
|
|
*/
|
|
pgd_t *pgd_alloc(struct mm_struct *mm)
|
|
{
|
|
pgd_t *new_pgd, *init_pgd;
|
|
pud_t *new_pud, *init_pud;
|
|
pmd_t *new_pmd, *init_pmd;
|
|
pte_t *new_pte, *init_pte;
|
|
|
|
new_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL, 2);
|
|
if (!new_pgd)
|
|
goto no_pgd;
|
|
|
|
memset(new_pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
|
|
|
|
/*
|
|
* Copy over the kernel and IO PGD entries
|
|
*/
|
|
init_pgd = pgd_offset_k(0);
|
|
memcpy(new_pgd + USER_PTRS_PER_PGD, init_pgd + USER_PTRS_PER_PGD,
|
|
(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
|
|
|
|
clean_dcache_area(new_pgd, PTRS_PER_PGD * sizeof(pgd_t));
|
|
|
|
if (!vectors_high()) {
|
|
/*
|
|
* On ARM, first page must always be allocated since it
|
|
* contains the machine vectors.
|
|
*/
|
|
new_pud = pud_alloc(mm, new_pgd, 0);
|
|
if (!new_pud)
|
|
goto no_pud;
|
|
|
|
new_pmd = pmd_alloc(mm, new_pud, 0);
|
|
if (!new_pmd)
|
|
goto no_pmd;
|
|
|
|
new_pte = pte_alloc_map(mm, NULL, new_pmd, 0);
|
|
if (!new_pte)
|
|
goto no_pte;
|
|
|
|
init_pud = pud_offset(init_pgd, 0);
|
|
init_pmd = pmd_offset(init_pud, 0);
|
|
init_pte = pte_offset_map(init_pmd, 0);
|
|
set_pte_ext(new_pte, *init_pte, 0);
|
|
pte_unmap(init_pte);
|
|
pte_unmap(new_pte);
|
|
}
|
|
|
|
return new_pgd;
|
|
|
|
no_pte:
|
|
pmd_free(mm, new_pmd);
|
|
no_pmd:
|
|
pud_free(mm, new_pud);
|
|
no_pud:
|
|
free_pages((unsigned long)new_pgd, 2);
|
|
no_pgd:
|
|
return NULL;
|
|
}
|
|
|
|
void pgd_free(struct mm_struct *mm, pgd_t *pgd_base)
|
|
{
|
|
pgd_t *pgd;
|
|
pud_t *pud;
|
|
pmd_t *pmd;
|
|
pgtable_t pte;
|
|
|
|
if (!pgd_base)
|
|
return;
|
|
|
|
pgd = pgd_base + pgd_index(0);
|
|
if (pgd_none_or_clear_bad(pgd))
|
|
goto no_pgd;
|
|
|
|
pud = pud_offset(pgd, 0);
|
|
if (pud_none_or_clear_bad(pud))
|
|
goto no_pud;
|
|
|
|
pmd = pmd_offset(pud, 0);
|
|
if (pmd_none_or_clear_bad(pmd))
|
|
goto no_pmd;
|
|
|
|
pte = pmd_pgtable(*pmd);
|
|
pmd_clear(pmd);
|
|
pte_free(mm, pte);
|
|
no_pmd:
|
|
pud_clear(pud);
|
|
pmd_free(mm, pmd);
|
|
no_pud:
|
|
pgd_clear(pgd);
|
|
pud_free(mm, pud);
|
|
no_pgd:
|
|
free_pages((unsigned long) pgd_base, 2);
|
|
}
|