/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* OpenRISC Linux
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* OpenRISC implementation:
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
* et al.
*/
#ifndef __ASM_OPENRISC_PGALLOC_H
#define __ASM_OPENRISC_PGALLOC_H
#include <
asm/page.h>
#include <linux/threads.h>
#include <linux/mm.h>
#include <linux/memblock.h>
#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
#include <asm-generic/pgalloc.h>
extern int mem_init_done;
#define pmd_populate_kernel(mm, pmd, pte) \
set_pmd(pmd, __pmd(_KERNPG_TABLE + __pa(pte)))
static inline void pmd_populate(
struct mm_struct *mm, pmd_t *pmd,
struct page *pte)
{
set_pmd(pmd, __pmd(_KERNPG_TABLE +
((
unsigned long)page_to_pfn(pte) <<
(
unsigned long) PAGE_SHIFT)));
}
/*
* Allocate and free page tables.
*/
static inline pgd_t *pgd_alloc(
struct mm_struct *mm)
{
pgd_t *ret = __pgd_alloc(mm, 0);
if (ret)
memcpy(ret + USER_PTRS_PER_PGD,
swapper_pg_dir + USER_PTRS_PER_PGD,
(PTRS_PER_PGD - USER_PTRS_PER_PGD) *
sizeof(pgd_t));
return ret;
}
#if 0
/* FIXME: This seems to be the preferred style, but we are using
* current_pgd (from mm->pgd) to load kernel pages so we need it
* initialized. This needs to be looked into.
*/
extern inline pgd_t *pgd_alloc(
struct mm_struct *mm)
{
return (pgd_t *)get_zeroed_page(GFP_KERNEL);
}
#endif
extern pte_t *pte_alloc_one_kernel(
struct mm_struct *mm);
#define __pte_free_tlb(tlb, pte, addr) \
tlb_remove_ptdesc((tlb), page_ptdesc(pte))
#endif
