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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Based on arch/arm/include/asm/pgalloc.h
*
* Copyright (C) 2000-2001 Russell King
* Copyright (C) 2012 ARM Ltd.
*/
#ifndef __ASM_PGALLOC_H
#define __ASM_PGALLOC_H
#include <asm/pgtable-hwdef.h>
#include <asm/processor.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#define __HAVE_ARCH_PGD_FREE
#define __HAVE_ARCH_PUD_FREE
#include <asm-generic/pgalloc.h>
#define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t))
#if CONFIG_PGTABLE_LEVELS > 2
static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
{
set_pud(pudp, __pud(__phys_to_pud_val(pmdp) | prot));
}
static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp)
{
pudval_t pudval = PUD_TYPE_TABLE;
pudval |= (mm == &init_mm) ? PUD_TABLE_UXN : PUD_TABLE_PXN;
__pud_populate(pudp, __pa(pmdp), pudval);
}
#else
static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
{
BUILD_BUG();
}
#endif /* CONFIG_PGTABLE_LEVELS > 2 */
#if CONFIG_PGTABLE_LEVELS > 3
static inline void __p4d_populate(p4d_t *p4dp, phys_addr_t pudp, p4dval_t prot)
{
if (pgtable_l4_enabled())
set_p4d(p4dp, __p4d(__phys_to_p4d_val(pudp) | prot));
}
static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4dp, pud_t *pudp)
{
p4dval_t p4dval = P4D_TYPE_TABLE;
p4dval |= (mm == &init_mm) ? P4D_TABLE_UXN : P4D_TABLE_PXN;
__p4d_populate(p4dp, __pa(pudp), p4dval);
}
static inline void pud_free(struct mm_struct *mm, pud_t *pud)
{
if (!pgtable_l4_enabled())
return;
BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
free_page((unsigned long)pud);
}
#else
static inline void __p4d_populate(p4d_t *p4dp, phys_addr_t pudp, p4dval_t prot)
{
BUILD_BUG();
}
#endif /* CONFIG_PGTABLE_LEVELS > 3 */
#if CONFIG_PGTABLE_LEVELS > 4
static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t p4dp, pgdval_t prot)
{
if (pgtable_l5_enabled())
set_pgd(pgdp, __pgd(__phys_to_pgd_val(p4dp) | prot));
}
static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgdp, p4d_t *p4dp)
{
pgdval_t pgdval = PGD_TYPE_TABLE;
pgdval |= (mm == &init_mm) ? PGD_TABLE_UXN : PGD_TABLE_PXN;
__pgd_populate(pgdp, __pa(p4dp), pgdval);
}
static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr)
{
gfp_t gfp = GFP_PGTABLE_USER;
if (mm == &init_mm)
gfp = GFP_PGTABLE_KERNEL;
return (p4d_t *)get_zeroed_page(gfp);
}
static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
{
if (!pgtable_l5_enabled())
return;
BUG_ON((unsigned long)p4d & (PAGE_SIZE-1));
free_page((unsigned long)p4d);
}
#define __p4d_free_tlb(tlb, p4d, addr) p4d_free((tlb)->mm, p4d)
#else
static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t p4dp, pgdval_t prot)
{
BUILD_BUG();
}
#endif /* CONFIG_PGTABLE_LEVELS > 4 */
extern pgd_t *pgd_alloc(struct mm_struct *mm);
extern void pgd_free(struct mm_struct *mm, pgd_t *pgdp);
static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t ptep,
pmdval_t prot)
{
set_pmd(pmdp, __pmd(__phys_to_pmd_val(ptep) | prot));
}
/*
* Populate the pmdp entry with a pointer to the pte. This pmd is part
* of the mm address space.
*/
static inline void
pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
{
VM_BUG_ON(mm && mm != &init_mm);
__pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE | PMD_TABLE_UXN);
}
static inline void
pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
{
VM_BUG_ON(mm == &init_mm);
__pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE | PMD_TABLE_PXN);
}
#endif
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