mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 02:50:53 +07:00
59fd53cd5c
This patch includes memory initializations and highmem supporting. Signed-off-by: Vincent Chen <vincentc@andestech.com> Signed-off-by: Greentime Hu <greentime@andestech.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
91 lines
1.8 KiB
C
91 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
// Copyright (C) 2005-2017 Andes Technology Corporation
|
|
|
|
#include <linux/init_task.h>
|
|
#include <asm/pgalloc.h>
|
|
|
|
#define FIRST_KERNEL_PGD_NR (USER_PTRS_PER_PGD)
|
|
|
|
/*
|
|
* need to get a page for level 1
|
|
*/
|
|
|
|
pgd_t *pgd_alloc(struct mm_struct *mm)
|
|
{
|
|
pgd_t *new_pgd, *init_pgd;
|
|
int i;
|
|
|
|
new_pgd = (pgd_t *) __get_free_pages(GFP_KERNEL, 0);
|
|
if (!new_pgd)
|
|
return NULL;
|
|
for (i = 0; i < PTRS_PER_PGD; i++) {
|
|
(*new_pgd) = 1;
|
|
new_pgd++;
|
|
}
|
|
new_pgd -= PTRS_PER_PGD;
|
|
|
|
init_pgd = pgd_offset_k(0);
|
|
|
|
memcpy(new_pgd + FIRST_KERNEL_PGD_NR, init_pgd + FIRST_KERNEL_PGD_NR,
|
|
(PTRS_PER_PGD - FIRST_KERNEL_PGD_NR) * sizeof(pgd_t));
|
|
|
|
cpu_dcache_wb_range((unsigned long)new_pgd,
|
|
(unsigned long)new_pgd +
|
|
PTRS_PER_PGD * sizeof(pgd_t));
|
|
inc_zone_page_state(virt_to_page((unsigned long *)new_pgd),
|
|
NR_PAGETABLE);
|
|
|
|
return new_pgd;
|
|
}
|
|
|
|
void pgd_free(struct mm_struct *mm, pgd_t * pgd)
|
|
{
|
|
pmd_t *pmd;
|
|
struct page *pte;
|
|
|
|
if (!pgd)
|
|
return;
|
|
|
|
pmd = (pmd_t *) pgd;
|
|
if (pmd_none(*pmd))
|
|
goto free;
|
|
if (pmd_bad(*pmd)) {
|
|
pmd_ERROR(*pmd);
|
|
pmd_clear(pmd);
|
|
goto free;
|
|
}
|
|
|
|
pte = pmd_page(*pmd);
|
|
pmd_clear(pmd);
|
|
dec_zone_page_state(virt_to_page((unsigned long *)pgd), NR_PAGETABLE);
|
|
pte_free(mm, pte);
|
|
mm_dec_nr_ptes(mm);
|
|
pmd_free(mm, pmd);
|
|
free:
|
|
free_pages((unsigned long)pgd, 0);
|
|
}
|
|
|
|
/*
|
|
* In order to soft-boot, we need to insert a 1:1 mapping in place of
|
|
* the user-mode pages. This will then ensure that we have predictable
|
|
* results when turning the mmu off
|
|
*/
|
|
void setup_mm_for_reboot(char mode)
|
|
{
|
|
unsigned long pmdval;
|
|
pgd_t *pgd;
|
|
pmd_t *pmd;
|
|
int i;
|
|
|
|
if (current->mm && current->mm->pgd)
|
|
pgd = current->mm->pgd;
|
|
else
|
|
pgd = init_mm.pgd;
|
|
|
|
for (i = 0; i < USER_PTRS_PER_PGD; i++) {
|
|
pmdval = (i << PGDIR_SHIFT);
|
|
pmd = pmd_offset(pgd + i, i << PGDIR_SHIFT);
|
|
set_pmd(pmd, __pmd(pmdval));
|
|
}
|
|
}
|