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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
* Copyright (C) 2012 Regents of the University of California
*/
#ifndef _ASM_RISCV_PGALLOC_H
#define _ASM_RISCV_PGALLOC_H
#include <linux/mm.h>
#include <asm/tlb.h>
#ifdef CONFIG_MMU
#define __HAVE_ARCH_PUD_ALLOC_ONE
#define __HAVE_ARCH_PUD_FREE
#include <asm-generic/pgalloc.h>
static inline void pmd_populate_kernel(struct mm_struct *mm,
pmd_t *pmd, pte_t *pte)
{
unsigned long pfn = virt_to_pfn(pte);
set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
}
static inline void pmd_populate(struct mm_struct *mm,
pmd_t *pmd, pgtable_t pte)
{
unsigned long pfn = virt_to_pfn(page_address(pte));
set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
}
#ifndef __PAGETABLE_PMD_FOLDED
static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{
unsigned long pfn = virt_to_pfn(pmd);
set_pud(pud, __pud((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
}
static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
{
if (pgtable_l4_enabled) {
unsigned long pfn = virt_to_pfn(pud);
set_p4d(p4d, __p4d((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
}
}
static inline void p4d_populate_safe(struct mm_struct *mm, p4d_t *p4d,
pud_t *pud)
{
if (pgtable_l4_enabled) {
unsigned long pfn = virt_to_pfn(pud);
set_p4d_safe(p4d,
__p4d((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
}
}
static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
{
if (pgtable_l5_enabled) {
unsigned long pfn = virt_to_pfn(p4d);
set_pgd(pgd, __pgd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
}
}
static inline void pgd_populate_safe(struct mm_struct *mm, pgd_t *pgd,
p4d_t *p4d)
{
if (pgtable_l5_enabled) {
unsigned long pfn = virt_to_pfn(p4d);
set_pgd_safe(pgd,
__pgd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
}
}
#define pud_alloc_one pud_alloc_one
static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
if (pgtable_l4_enabled)
return __pud_alloc_one(mm, addr);
return NULL;
}
#define pud_free pud_free
static inline void pud_free(struct mm_struct *mm, pud_t *pud)
{
if (pgtable_l4_enabled)
__pud_free(mm, pud);
}
#define __pud_free_tlb(tlb, pud, addr) pud_free((tlb)->mm, pud)
#define p4d_alloc_one p4d_alloc_one
static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr)
{
if (pgtable_l5_enabled) {
gfp_t gfp = GFP_PGTABLE_USER;
if (mm == &init_mm)
gfp = GFP_PGTABLE_KERNEL;
return (p4d_t *)get_zeroed_page(gfp);
}
return NULL;
}
static inline void __p4d_free(struct mm_struct *mm, p4d_t *p4d)
{
BUG_ON((unsigned long)p4d & (PAGE_SIZE-1));
free_page((unsigned long)p4d);
}
#define p4d_free p4d_free
static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
{
if (pgtable_l5_enabled)
__p4d_free(mm, p4d);
}
#define __p4d_free_tlb(tlb, p4d, addr) p4d_free((tlb)->mm, p4d)
#endif /* __PAGETABLE_PMD_FOLDED */
static inline void sync_kernel_mappings(pgd_t *pgd)
{
memcpy(pgd + USER_PTRS_PER_PGD,
init_mm.pgd + USER_PTRS_PER_PGD,
(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
}
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
pgd_t *pgd;
pgd = (pgd_t *)__get_free_page(GFP_KERNEL);
if (likely(pgd != NULL)) {
memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
/* Copy kernel mappings */
sync_kernel_mappings(pgd);
}
return pgd;
}
#ifndef __PAGETABLE_PMD_FOLDED
#define __pmd_free_tlb(tlb, pmd, addr) pmd_free((tlb)->mm, pmd)
#endif /* __PAGETABLE_PMD_FOLDED */
#define __pte_free_tlb(tlb, pte, buf) \
do { \
pagetable_pte_dtor(page_ptdesc(pte)); \
tlb_remove_page_ptdesc((tlb), page_ptdesc(pte));\
} while (0)
#endif /* CONFIG_MMU */
#endif /* _ASM_RISCV_PGALLOC_H */
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