105 lines
2.3 KiB
C
105 lines
2.3 KiB
C
|
/* 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>
|
||
|
|
|
||
|
|
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_t *)__get_free_page(GFP_KERNEL);
|
||
|
|
|
||
|
|
if (ret) {
|
||
|
|
memset(ret, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
|
||
|
|
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
|
||
|
|
|
||
|
|
static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
|
||
|
|
{
|
||
|
|
free_page((unsigned long)pgd);
|
||
|
|
}
|
||
|
|
|
||
|
|
extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm);
|
||
|
|
|
||
|
|
static inline struct page *pte_alloc_one(struct mm_struct *mm)
|
||
|
|
{
|
||
|
|
struct page *pte;
|
||
|
|
pte = alloc_pages(GFP_KERNEL, 0);
|
||
|
|
if (!pte)
|
||
|
|
return NULL;
|
||
|
|
clear_page(page_address(pte));
|
||
|
|
if (!pgtable_pte_page_ctor(pte)) {
|
||
|
|
__free_page(pte);
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
return pte;
|
||
|
|
}
|
||
|
|
|
||
|
|
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, struct page *pte)
|
||
|
|
{
|
||
|
|
pgtable_pte_page_dtor(pte);
|
||
|
|
__free_page(pte);
|
||
|
|
}
|
||
|
|
|
||
|
|
#define __pte_free_tlb(tlb, pte, addr) \
|
||
|
|
do { \
|
||
|
|
pgtable_pte_page_dtor(pte); \
|
||
|
|
tlb_remove_page((tlb), (pte)); \
|
||
|
|
} while (0)
|
||
|
|
|
||
|
|
#define pmd_pgtable(pmd) pmd_page(pmd)
|
||
|
|
|
||
|
|
#endif
|