[mirror_ubuntu-jammy-kernel.git] / include / asm-generic / pgtable-nop4d.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _PGTABLE_NOP4D_H
#define _PGTABLE_NOP4D_H

#ifndef __ASSEMBLY__

#define __PAGETABLE_P4D_FOLDED

typedef struct { pgd_t pgd; } p4d_t;

#define P4D_SHIFT		PGDIR_SHIFT
#define MAX_PTRS_PER_P4D	1
#define PTRS_PER_P4D		1
#define P4D_SIZE		(1UL << P4D_SHIFT)
#define P4D_MASK		(~(P4D_SIZE-1))

/*
 * The "pgd_xxx()" functions here are trivial for a folded two-level
 * setup: the p4d is never bad, and a p4d always exists (as it's folded
 * into the pgd entry)
 */
static inline int pgd_none(pgd_t pgd)		{ return 0; }
static inline int pgd_bad(pgd_t pgd)		{ return 0; }
static inline int pgd_present(pgd_t pgd)	{ return 1; }
static inline void pgd_clear(pgd_t *pgd)	{ }
#define p4d_ERROR(p4d)				(pgd_ERROR((p4d).pgd))

#define pgd_populate(mm, pgd, p4d)		do { } while (0)
/*
 * (p4ds are folded into pgds so this doesn't get actually called,
 * but the define is needed for a generic inline function.)
 */
#define set_pgd(pgdptr, pgdval)	set_p4d((p4d_t *)(pgdptr), (p4d_t) { pgdval })

static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
{
	return (p4d_t *)pgd;
}

#define p4d_val(x)				(pgd_val((x).pgd))
#define __p4d(x)				((p4d_t) { __pgd(x) })

#define pgd_page(pgd)				(p4d_page((p4d_t){ pgd }))
#define pgd_page_vaddr(pgd)			(p4d_page_vaddr((p4d_t){ pgd }))

/*
 * allocating and freeing a p4d is trivial: the 1-entry p4d is
 * inside the pgd, so has no extra memory associated with it.
 */
#define p4d_alloc_one(mm, address)		NULL
#define p4d_free(mm, x)				do { } while (0)
#define __p4d_free_tlb(tlb, x, a)		do { } while (0)

#undef  p4d_addr_end
#define p4d_addr_end(addr, end)			(end)

#endif /* __ASSEMBLY__ */
#endif /* _PGTABLE_NOP4D_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
048456dc KS	2	#ifndef _PGTABLE_NOP4D_H
	3	#define _PGTABLE_NOP4D_H
	4
	5	#ifndef __ASSEMBLY__
	6
	7	#define __PAGETABLE_P4D_FOLDED
	8
	9	typedef struct { pgd_t pgd; } p4d_t;
	10
c65e774f KS	11	#define P4D_SHIFT PGDIR_SHIFT
	12	#define MAX_PTRS_PER_P4D 1
	13	#define PTRS_PER_P4D 1
	14	#define P4D_SIZE (1UL << P4D_SHIFT)
	15	#define P4D_MASK (~(P4D_SIZE-1))
048456dc KS	16
	17	/*
	18	* The "pgd_xxx()" functions here are trivial for a folded two-level
	19	* setup: the p4d is never bad, and a p4d always exists (as it's folded
	20	* into the pgd entry)
	21	*/
	22	static inline int pgd_none(pgd_t pgd) { return 0; }
	23	static inline int pgd_bad(pgd_t pgd) { return 0; }
	24	static inline int pgd_present(pgd_t pgd) { return 1; }
	25	static inline void pgd_clear(pgd_t *pgd) { }
	26	#define p4d_ERROR(p4d) (pgd_ERROR((p4d).pgd))
	27
	28	#define pgd_populate(mm, pgd, p4d) do { } while (0)
	29	/*
	30	* (p4ds are folded into pgds so this doesn't get actually called,
	31	* but the define is needed for a generic inline function.)
	32	*/
	33	#define set_pgd(pgdptr, pgdval) set_p4d((p4d_t *)(pgdptr), (p4d_t) { pgdval })
	34
	35	static inline p4d_t p4d_offset(pgd_t pgd, unsigned long address)
	36	{
	37	return (p4d_t *)pgd;
	38	}
	39
	40	#define p4d_val(x) (pgd_val((x).pgd))
	41	#define __p4d(x) ((p4d_t) { __pgd(x) })
	42
	43	#define pgd_page(pgd) (p4d_page((p4d_t){ pgd }))
	44	#define pgd_page_vaddr(pgd) (p4d_page_vaddr((p4d_t){ pgd }))
	45
	46	/*
	47	* allocating and freeing a p4d is trivial: the 1-entry p4d is
	48	* inside the pgd, so has no extra memory associated with it.
	49	*/
	50	#define p4d_alloc_one(mm, address) NULL
	51	#define p4d_free(mm, x) do { } while (0)
	52	#define __p4d_free_tlb(tlb, x, a) do { } while (0)
	53
	54	#undef p4d_addr_end
	55	#define p4d_addr_end(addr, end) (end)
	56
	57	#endif /* __ASSEMBLY__ */
	58	#endif /* _PGTABLE_NOP4D_H */