arch/riscv/include/asm/pgtable-64.h - linux - Git at Google

 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * Copyright (C) 2012 Regents of the University of California
  */

 #ifndef _ASM_RISCV_PGTABLE_64_H
 #define _ASM_RISCV_PGTABLE_64_H

 #include <linux/bits.h>
 #include <linux/const.h>
 #include <asm/errata_list.h>

 extern bool pgtable_l4_enabled;
 extern bool pgtable_l5_enabled;

 #define PGDIR_SHIFT_L3  30
 #define PGDIR_SHIFT_L4  39
 #define PGDIR_SHIFT_L5  48
 #define PGDIR_SIZE_L3   (_AC(1, UL) << PGDIR_SHIFT_L3)

 #define PGDIR_SHIFT     (pgtable_l5_enabled ? PGDIR_SHIFT_L5 : \
 		(pgtable_l4_enabled ? PGDIR_SHIFT_L4 : PGDIR_SHIFT_L3))
 /* Size of region mapped by a page global directory */
 #define PGDIR_SIZE      (_AC(1, UL) << PGDIR_SHIFT)
 #define PGDIR_MASK      (~(PGDIR_SIZE - 1))

 /* p4d is folded into pgd in case of 4-level page table */
 #define P4D_SHIFT      39
 #define P4D_SIZE       (_AC(1, UL) << P4D_SHIFT)
 #define P4D_MASK       (~(P4D_SIZE - 1))

 /* pud is folded into pgd in case of 3-level page table */
 #define PUD_SHIFT      30
 #define PUD_SIZE       (_AC(1, UL) << PUD_SHIFT)
 #define PUD_MASK       (~(PUD_SIZE - 1))

 #define PMD_SHIFT       21
 /* Size of region mapped by a page middle directory */
 #define PMD_SIZE        (_AC(1, UL) << PMD_SHIFT)
 #define PMD_MASK        (~(PMD_SIZE - 1))

 /* Page 4th Directory entry */
 typedef struct {
 	unsigned long p4d;
 } p4d_t;

 #define p4d_val(x)	((x).p4d)
 #define __p4d(x)	((p4d_t) { (x) })
 #define PTRS_PER_P4D	(PAGE_SIZE / sizeof(p4d_t))

 /* Page Upper Directory entry */
 typedef struct {
 	unsigned long pud;
 } pud_t;

 #define pud_val(x)      ((x).pud)
 #define __pud(x)        ((pud_t) { (x) })
 #define PTRS_PER_PUD    (PAGE_SIZE / sizeof(pud_t))

 /* Page Middle Directory entry */
 typedef struct {
 	unsigned long pmd;
 } pmd_t;

 #define pmd_val(x)      ((x).pmd)
 #define __pmd(x)        ((pmd_t) { (x) })

 #define PTRS_PER_PMD    (PAGE_SIZE / sizeof(pmd_t))

 /*
  * rv64 PTE format:
  * | 63 | 62 61 | 60 54 | 53  10 | 9             8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0
  *   N      MT     RSV    PFN      reserved for SW   D   A   G   U   X   W   R   V
  */
 #define _PAGE_PFN_MASK  GENMASK(53, 10)

 /*
  * [62:61] Svpbmt Memory Type definitions:
  *
  *  00 - PMA    Normal Cacheable, No change to implied PMA memory type
  *  01 - NC     Non-cacheable, idempotent, weakly-ordered Main Memory
  *  10 - IO     Non-cacheable, non-idempotent, strongly-ordered I/O memory
  *  11 - Rsvd   Reserved for future standard use
  */
 #define _PAGE_NOCACHE_SVPBMT	(1UL << 61)
 #define _PAGE_IO_SVPBMT		(1UL << 62)
 #define _PAGE_MTMASK_SVPBMT	(_PAGE_NOCACHE_SVPBMT | _PAGE_IO_SVPBMT)

 /*
  * [63:59] T-Head Memory Type definitions:
  *
  * 00000 - NC   Weakly-ordered, Non-cacheable, Non-bufferable, Non-shareable, Non-trustable
  * 01110 - PMA  Weakly-ordered, Cacheable, Bufferable, Shareable, Non-trustable
  * 10000 - IO   Strongly-ordered, Non-cacheable, Non-bufferable, Non-shareable, Non-trustable
  */
 #define _PAGE_PMA_THEAD		((1UL << 62) | (1UL << 61) | (1UL << 60))
 #define _PAGE_NOCACHE_THEAD	0UL
 #define _PAGE_IO_THEAD		(1UL << 63)
 #define _PAGE_MTMASK_THEAD	(_PAGE_PMA_THEAD | _PAGE_IO_THEAD | (1UL << 59))

 static inline u64 riscv_page_mtmask(void)
 {
 	u64 val;

 	ALT_SVPBMT(val, _PAGE_MTMASK);
 	return val;
 }

 static inline u64 riscv_page_nocache(void)
 {
 	u64 val;

 	ALT_SVPBMT(val, _PAGE_NOCACHE);
 	return val;
 }

 static inline u64 riscv_page_io(void)
 {
 	u64 val;

 	ALT_SVPBMT(val, _PAGE_IO);
 	return val;
 }

 #define _PAGE_NOCACHE		riscv_page_nocache()
 #define _PAGE_IO		riscv_page_io()
 #define _PAGE_MTMASK		riscv_page_mtmask()

 /* Set of bits to preserve across pte_modify() */
 #define _PAGE_CHG_MASK  (~(unsigned long)(_PAGE_PRESENT | _PAGE_READ |	\
 					  _PAGE_WRITE | _PAGE_EXEC |	\
 					  _PAGE_USER | _PAGE_GLOBAL |	\
 					  _PAGE_MTMASK))

 static inline int pud_present(pud_t pud)
 {
 	return (pud_val(pud) & _PAGE_PRESENT);
 }

 static inline int pud_none(pud_t pud)
 {
 	return (pud_val(pud) == 0);
 }

 static inline int pud_bad(pud_t pud)
 {
 	return !pud_present(pud);
 }

 #define pud_leaf	pud_leaf
 static inline int pud_leaf(pud_t pud)
 {
 	return pud_present(pud) && (pud_val(pud) & _PAGE_LEAF);
 }

 static inline int pud_user(pud_t pud)
 {
 	return pud_val(pud) & _PAGE_USER;
 }

 static inline void set_pud(pud_t *pudp, pud_t pud)
 {
 	*pudp = pud;
 }

 static inline void pud_clear(pud_t *pudp)
 {
 	set_pud(pudp, __pud(0));
 }

 static inline pud_t pfn_pud(unsigned long pfn, pgprot_t prot)
 {
 	return __pud((pfn << _PAGE_PFN_SHIFT) | pgprot_val(prot));
 }

 static inline unsigned long _pud_pfn(pud_t pud)
 {
 	return pud_val(pud) >> _PAGE_PFN_SHIFT;
 }

 static inline pmd_t *pud_pgtable(pud_t pud)
 {
 	return (pmd_t *)pfn_to_virt(__page_val_to_pfn(pud_val(pud)));
 }

 static inline struct page *pud_page(pud_t pud)
 {
 	return pfn_to_page(__page_val_to_pfn(pud_val(pud)));
 }

 #define mm_p4d_folded  mm_p4d_folded
 static inline bool mm_p4d_folded(struct mm_struct *mm)
 {
 	if (pgtable_l5_enabled)
 		return false;

 	return true;
 }

 #define mm_pud_folded  mm_pud_folded
 static inline bool mm_pud_folded(struct mm_struct *mm)
 {
 	if (pgtable_l4_enabled)
 		return false;

 	return true;
 }

 #define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))

 static inline pmd_t pfn_pmd(unsigned long pfn, pgprot_t prot)
 {
 	unsigned long prot_val = pgprot_val(prot);

 	ALT_THEAD_PMA(prot_val);

 	return __pmd((pfn << _PAGE_PFN_SHIFT) | prot_val);
 }

 static inline unsigned long _pmd_pfn(pmd_t pmd)
 {
 	return __page_val_to_pfn(pmd_val(pmd));
 }

 #define mk_pmd(page, prot)    pfn_pmd(page_to_pfn(page), prot)

 #define pmd_ERROR(e) \
 	pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))

 #define pud_ERROR(e)   \
 	pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e))

 #define p4d_ERROR(e)   \
 	pr_err("%s:%d: bad p4d %016lx.\n", __FILE__, __LINE__, p4d_val(e))

 static inline void set_p4d(p4d_t *p4dp, p4d_t p4d)
 {
 	if (pgtable_l4_enabled)
 		*p4dp = p4d;
 	else
 		set_pud((pud_t *)p4dp, (pud_t){ p4d_val(p4d) });
 }

 static inline int p4d_none(p4d_t p4d)
 {
 	if (pgtable_l4_enabled)
 		return (p4d_val(p4d) == 0);

 	return 0;
 }

 static inline int p4d_present(p4d_t p4d)
 {
 	if (pgtable_l4_enabled)
 		return (p4d_val(p4d) & _PAGE_PRESENT);

 	return 1;
 }

 static inline int p4d_bad(p4d_t p4d)
 {
 	if (pgtable_l4_enabled)
 		return !p4d_present(p4d);

 	return 0;
 }

 static inline void p4d_clear(p4d_t *p4d)
 {
 	if (pgtable_l4_enabled)
 		set_p4d(p4d, __p4d(0));
 }

 static inline p4d_t pfn_p4d(unsigned long pfn, pgprot_t prot)
 {
 	return __p4d((pfn << _PAGE_PFN_SHIFT) | pgprot_val(prot));
 }

 static inline unsigned long _p4d_pfn(p4d_t p4d)
 {
 	return p4d_val(p4d) >> _PAGE_PFN_SHIFT;
 }

 static inline pud_t *p4d_pgtable(p4d_t p4d)
 {
 	if (pgtable_l4_enabled)
 		return (pud_t *)pfn_to_virt(p4d_val(p4d) >> _PAGE_PFN_SHIFT);

 	return (pud_t *)pud_pgtable((pud_t) { p4d_val(p4d) });
 }
 #define p4d_page_vaddr(p4d)	((unsigned long)p4d_pgtable(p4d))

 static inline struct page *p4d_page(p4d_t p4d)
 {
 	return pfn_to_page(p4d_val(p4d) >> _PAGE_PFN_SHIFT);
 }

 #define pud_index(addr) (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))

 #define pud_offset pud_offset
 static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
 {
 	if (pgtable_l4_enabled)
 		return p4d_pgtable(*p4d) + pud_index(address);

 	return (pud_t *)p4d;
 }

 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
 {
 	if (pgtable_l5_enabled)
 		*pgdp = pgd;
 	else
 		set_p4d((p4d_t *)pgdp, (p4d_t){ pgd_val(pgd) });
 }

 static inline int pgd_none(pgd_t pgd)
 {
 	if (pgtable_l5_enabled)
 		return (pgd_val(pgd) == 0);

 	return 0;
 }

 static inline int pgd_present(pgd_t pgd)
 {
 	if (pgtable_l5_enabled)
 		return (pgd_val(pgd) & _PAGE_PRESENT);

 	return 1;
 }

 static inline int pgd_bad(pgd_t pgd)
 {
 	if (pgtable_l5_enabled)
 		return !pgd_present(pgd);

 	return 0;
 }

 static inline void pgd_clear(pgd_t *pgd)
 {
 	if (pgtable_l5_enabled)
 		set_pgd(pgd, __pgd(0));
 }

 static inline p4d_t *pgd_pgtable(pgd_t pgd)
 {
 	if (pgtable_l5_enabled)
 		return (p4d_t *)pfn_to_virt(pgd_val(pgd) >> _PAGE_PFN_SHIFT);

 	return (p4d_t *)p4d_pgtable((p4d_t) { pgd_val(pgd) });
 }
 #define pgd_page_vaddr(pgd)	((unsigned long)pgd_pgtable(pgd))

 static inline struct page *pgd_page(pgd_t pgd)
 {
 	return pfn_to_page(pgd_val(pgd) >> _PAGE_PFN_SHIFT);
 }
 #define pgd_page(pgd)	pgd_page(pgd)

 #define p4d_index(addr) (((addr) >> P4D_SHIFT) & (PTRS_PER_P4D - 1))

 #define p4d_offset p4d_offset
 static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
 {
 	if (pgtable_l5_enabled)
 		return pgd_pgtable(*pgd) + p4d_index(address);

 	return (p4d_t *)pgd;
 }

 #endif /* _ASM_RISCV_PGTABLE_64_H */
	/* SPDX-License-Identifier: GPL-2.0-only */
	/*
	* Copyright (C) 2012 Regents of the University of California
	*/

	#ifndef _ASM_RISCV_PGTABLE_64_H
	#define _ASM_RISCV_PGTABLE_64_H

	#include <linux/bits.h>
	#include <linux/const.h>
	#include <asm/errata_list.h>

	extern bool pgtable_l4_enabled;
	extern bool pgtable_l5_enabled;

	#define PGDIR_SHIFT_L3 30
	#define PGDIR_SHIFT_L4 39
	#define PGDIR_SHIFT_L5 48
	#define PGDIR_SIZE_L3 (_AC(1, UL) << PGDIR_SHIFT_L3)

	#define PGDIR_SHIFT (pgtable_l5_enabled ? PGDIR_SHIFT_L5 : \
	(pgtable_l4_enabled ? PGDIR_SHIFT_L4 : PGDIR_SHIFT_L3))
	/* Size of region mapped by a page global directory */
	#define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT)
	#define PGDIR_MASK (~(PGDIR_SIZE - 1))

	/* p4d is folded into pgd in case of 4-level page table */
	#define P4D_SHIFT 39
	#define P4D_SIZE (_AC(1, UL) << P4D_SHIFT)
	#define P4D_MASK (~(P4D_SIZE - 1))

	/* pud is folded into pgd in case of 3-level page table */
	#define PUD_SHIFT 30
	#define PUD_SIZE (_AC(1, UL) << PUD_SHIFT)
	#define PUD_MASK (~(PUD_SIZE - 1))

	#define PMD_SHIFT 21
	/* Size of region mapped by a page middle directory */
	#define PMD_SIZE (_AC(1, UL) << PMD_SHIFT)
	#define PMD_MASK (~(PMD_SIZE - 1))

	/* Page 4th Directory entry */
	typedef struct {
	unsigned long p4d;
	} p4d_t;

	#define p4d_val(x) ((x).p4d)
	#define __p4d(x) ((p4d_t) { (x) })
	#define PTRS_PER_P4D (PAGE_SIZE / sizeof(p4d_t))

	/* Page Upper Directory entry */
	typedef struct {
	unsigned long pud;
	} pud_t;

	#define pud_val(x) ((x).pud)
	#define __pud(x) ((pud_t) { (x) })
	#define PTRS_PER_PUD (PAGE_SIZE / sizeof(pud_t))

	/* Page Middle Directory entry */
	typedef struct {
	unsigned long pmd;
	} pmd_t;

	#define pmd_val(x) ((x).pmd)
	#define __pmd(x) ((pmd_t) { (x) })

	#define PTRS_PER_PMD (PAGE_SIZE / sizeof(pmd_t))

	/*
	* rv64 PTE format:
	* \| 63 \| 62 61 \| 60 54 \| 53 10 \| 9 8 \| 7 \| 6 \| 5 \| 4 \| 3 \| 2 \| 1 \| 0
	* N MT RSV PFN reserved for SW D A G U X W R V
	*/
	#define _PAGE_PFN_MASK GENMASK(53, 10)

	/*
	* [62:61] Svpbmt Memory Type definitions:
	*
	* 00 - PMA Normal Cacheable, No change to implied PMA memory type
	* 01 - NC Non-cacheable, idempotent, weakly-ordered Main Memory
	* 10 - IO Non-cacheable, non-idempotent, strongly-ordered I/O memory
	* 11 - Rsvd Reserved for future standard use
	*/
	#define _PAGE_NOCACHE_SVPBMT (1UL << 61)
	#define _PAGE_IO_SVPBMT (1UL << 62)
	#define _PAGE_MTMASK_SVPBMT (_PAGE_NOCACHE_SVPBMT \| _PAGE_IO_SVPBMT)

	/*
	* [63:59] T-Head Memory Type definitions:
	*
	* 00000 - NC Weakly-ordered, Non-cacheable, Non-bufferable, Non-shareable, Non-trustable
	* 01110 - PMA Weakly-ordered, Cacheable, Bufferable, Shareable, Non-trustable
	* 10000 - IO Strongly-ordered, Non-cacheable, Non-bufferable, Non-shareable, Non-trustable
	*/
	#define _PAGE_PMA_THEAD ((1UL << 62) \| (1UL << 61) \| (1UL << 60))
	#define _PAGE_NOCACHE_THEAD 0UL
	#define _PAGE_IO_THEAD (1UL << 63)
	#define _PAGE_MTMASK_THEAD (_PAGE_PMA_THEAD \| _PAGE_IO_THEAD \| (1UL << 59))

	static inline u64 riscv_page_mtmask(void)
	{
	u64 val;

	ALT_SVPBMT(val, _PAGE_MTMASK);
	return val;
	}

	static inline u64 riscv_page_nocache(void)
	{
	u64 val;

	ALT_SVPBMT(val, _PAGE_NOCACHE);
	return val;
	}

	static inline u64 riscv_page_io(void)
	{
	u64 val;

	ALT_SVPBMT(val, _PAGE_IO);
	return val;
	}

	#define _PAGE_NOCACHE riscv_page_nocache()
	#define _PAGE_IO riscv_page_io()
	#define _PAGE_MTMASK riscv_page_mtmask()

	/* Set of bits to preserve across pte_modify() */
	#define _PAGE_CHG_MASK (~(unsigned long)(_PAGE_PRESENT \| _PAGE_READ \| \
	_PAGE_WRITE \| _PAGE_EXEC \| \
	_PAGE_USER \| _PAGE_GLOBAL \| \
	_PAGE_MTMASK))

	static inline int pud_present(pud_t pud)
	{
	return (pud_val(pud) & _PAGE_PRESENT);
	}

	static inline int pud_none(pud_t pud)
	{
	return (pud_val(pud) == 0);
	}

	static inline int pud_bad(pud_t pud)
	{
	return !pud_present(pud);
	}

	#define pud_leaf pud_leaf
	static inline int pud_leaf(pud_t pud)
	{
	return pud_present(pud) && (pud_val(pud) & _PAGE_LEAF);
	}

	static inline int pud_user(pud_t pud)
	{
	return pud_val(pud) & _PAGE_USER;
	}

	static inline void set_pud(pud_t *pudp, pud_t pud)
	{
	*pudp = pud;
	}

	static inline void pud_clear(pud_t *pudp)
	{
	set_pud(pudp, __pud(0));
	}

	static inline pud_t pfn_pud(unsigned long pfn, pgprot_t prot)
	{
	return __pud((pfn << _PAGE_PFN_SHIFT) \| pgprot_val(prot));
	}

	static inline unsigned long _pud_pfn(pud_t pud)
	{
	return pud_val(pud) >> _PAGE_PFN_SHIFT;
	}

	static inline pmd_t *pud_pgtable(pud_t pud)
	{
	return (pmd_t *)pfn_to_virt(__page_val_to_pfn(pud_val(pud)));
	}

	static inline struct page *pud_page(pud_t pud)
	{
	return pfn_to_page(__page_val_to_pfn(pud_val(pud)));
	}

	#define mm_p4d_folded mm_p4d_folded
	static inline bool mm_p4d_folded(struct mm_struct *mm)
	{
	if (pgtable_l5_enabled)
	return false;

	return true;
	}

	#define mm_pud_folded mm_pud_folded
	static inline bool mm_pud_folded(struct mm_struct *mm)
	{
	if (pgtable_l4_enabled)
	return false;

	return true;
	}

	#define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))

	static inline pmd_t pfn_pmd(unsigned long pfn, pgprot_t prot)
	{
	unsigned long prot_val = pgprot_val(prot);

	ALT_THEAD_PMA(prot_val);

	return __pmd((pfn << _PAGE_PFN_SHIFT) \| prot_val);
	}

	static inline unsigned long _pmd_pfn(pmd_t pmd)
	{
	return __page_val_to_pfn(pmd_val(pmd));
	}

	#define mk_pmd(page, prot) pfn_pmd(page_to_pfn(page), prot)

	#define pmd_ERROR(e) \
	pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))

	#define pud_ERROR(e) \
	pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e))

	#define p4d_ERROR(e) \
	pr_err("%s:%d: bad p4d %016lx.\n", __FILE__, __LINE__, p4d_val(e))

	static inline void set_p4d(p4d_t *p4dp, p4d_t p4d)
	{
	if (pgtable_l4_enabled)
	*p4dp = p4d;
	else
	set_pud((pud_t *)p4dp, (pud_t){ p4d_val(p4d) });
	}

	static inline int p4d_none(p4d_t p4d)
	{
	if (pgtable_l4_enabled)
	return (p4d_val(p4d) == 0);

	return 0;
	}

	static inline int p4d_present(p4d_t p4d)
	{
	if (pgtable_l4_enabled)
	return (p4d_val(p4d) & _PAGE_PRESENT);

	return 1;
	}

	static inline int p4d_bad(p4d_t p4d)
	{
	if (pgtable_l4_enabled)
	return !p4d_present(p4d);

	return 0;
	}

	static inline void p4d_clear(p4d_t *p4d)
	{
	if (pgtable_l4_enabled)
	set_p4d(p4d, __p4d(0));
	}

	static inline p4d_t pfn_p4d(unsigned long pfn, pgprot_t prot)
	{
	return __p4d((pfn << _PAGE_PFN_SHIFT) \| pgprot_val(prot));
	}

	static inline unsigned long _p4d_pfn(p4d_t p4d)
	{
	return p4d_val(p4d) >> _PAGE_PFN_SHIFT;
	}

	static inline pud_t *p4d_pgtable(p4d_t p4d)
	{
	if (pgtable_l4_enabled)
	return (pud_t *)pfn_to_virt(p4d_val(p4d) >> _PAGE_PFN_SHIFT);

	return (pud_t *)pud_pgtable((pud_t) { p4d_val(p4d) });
	}
	#define p4d_page_vaddr(p4d) ((unsigned long)p4d_pgtable(p4d))

	static inline struct page *p4d_page(p4d_t p4d)
	{
	return pfn_to_page(p4d_val(p4d) >> _PAGE_PFN_SHIFT);
	}

	#define pud_index(addr) (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))

	#define pud_offset pud_offset
	static inline pud_t pud_offset(p4d_t p4d, unsigned long address)
	{
	if (pgtable_l4_enabled)
	return p4d_pgtable(*p4d) + pud_index(address);

	return (pud_t *)p4d;
	}

	static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
	{
	if (pgtable_l5_enabled)
	*pgdp = pgd;
	else
	set_p4d((p4d_t *)pgdp, (p4d_t){ pgd_val(pgd) });
	}

	static inline int pgd_none(pgd_t pgd)
	{
	if (pgtable_l5_enabled)
	return (pgd_val(pgd) == 0);

	return 0;
	}

	static inline int pgd_present(pgd_t pgd)
	{
	if (pgtable_l5_enabled)
	return (pgd_val(pgd) & _PAGE_PRESENT);

	return 1;
	}

	static inline int pgd_bad(pgd_t pgd)
	{
	if (pgtable_l5_enabled)
	return !pgd_present(pgd);

	return 0;
	}

	static inline void pgd_clear(pgd_t *pgd)
	{
	if (pgtable_l5_enabled)
	set_pgd(pgd, __pgd(0));
	}

	static inline p4d_t *pgd_pgtable(pgd_t pgd)
	{
	if (pgtable_l5_enabled)
	return (p4d_t *)pfn_to_virt(pgd_val(pgd) >> _PAGE_PFN_SHIFT);

	return (p4d_t *)p4d_pgtable((p4d_t) { pgd_val(pgd) });
	}
	#define pgd_page_vaddr(pgd) ((unsigned long)pgd_pgtable(pgd))

	static inline struct page *pgd_page(pgd_t pgd)
	{
	return pfn_to_page(pgd_val(pgd) >> _PAGE_PFN_SHIFT);
	}
	#define pgd_page(pgd) pgd_page(pgd)

	#define p4d_index(addr) (((addr) >> P4D_SHIFT) & (PTRS_PER_P4D - 1))

	#define p4d_offset p4d_offset
	static inline p4d_t p4d_offset(pgd_t pgd, unsigned long address)
	{
	if (pgtable_l5_enabled)
	return pgd_pgtable(*pgd) + p4d_index(address);

	return (p4d_t *)pgd;
	}

	#endif /* _ASM_RISCV_PGTABLE_64_H */