[linux-2.6-block.git] / include / asm-generic / pgtable-nop4d-hack.h

#ifndef _PGTABLE_NOP4D_HACK_H
#define _PGTABLE_NOP4D_HACK_H

#ifndef __ASSEMBLY__
#include <asm-generic/5level-fixup.h>

#define __PAGETABLE_PUD_FOLDED

/*
 * Having the pud type consist of a pgd gets the size right, and allows
 * us to conceptually access the pgd entry that this pud is folded into
 * without casting.
 */
typedef struct { pgd_t pgd; } pud_t;

#define PUD_SHIFT	PGDIR_SHIFT
#define PTRS_PER_PUD	1
#define PUD_SIZE	(1UL << PUD_SHIFT)
#define PUD_MASK	(~(PUD_SIZE-1))

/*
 * The "pgd_xxx()" functions here are trivial for a folded two-level
 * setup: the pud is never bad, and a pud 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 pud_ERROR(pud)				(pgd_ERROR((pud).pgd))

#define pgd_populate(mm, pgd, pud)		do { } while (0)
/*
 * (puds 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_pud((pud_t *)(pgdptr), (pud_t) { pgdval })

static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
{
	return (pud_t *)pgd;
}

#define pud_val(x)				(pgd_val((x).pgd))
#define __pud(x)				((pud_t) { __pgd(x) })

#define pgd_page(pgd)				(pud_page((pud_t){ pgd }))
#define pgd_page_vaddr(pgd)			(pud_page_vaddr((pud_t){ pgd }))

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

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

#endif /* __ASSEMBLY__ */
#endif /* _PGTABLE_NOP4D_HACK_H */
Commit	Line	Data
30ec8426 KS	1	#ifndef _PGTABLE_NOP4D_HACK_H
	2	#define _PGTABLE_NOP4D_HACK_H
	3
	4	#ifndef __ASSEMBLY__
	5	#include <asm-generic/5level-fixup.h>
	6
	7	#define __PAGETABLE_PUD_FOLDED
	8
	9	/*
	10	* Having the pud type consist of a pgd gets the size right, and allows
	11	* us to conceptually access the pgd entry that this pud is folded into
	12	* without casting.
	13	*/
	14	typedef struct { pgd_t pgd; } pud_t;
	15
	16	#define PUD_SHIFT PGDIR_SHIFT
	17	#define PTRS_PER_PUD 1
	18	#define PUD_SIZE (1UL << PUD_SHIFT)
	19	#define PUD_MASK (~(PUD_SIZE-1))
	20
	21	/*
	22	* The "pgd_xxx()" functions here are trivial for a folded two-level
	23	* setup: the pud is never bad, and a pud always exists (as it's folded
	24	* into the pgd entry)
	25	*/
	26	static inline int pgd_none(pgd_t pgd) { return 0; }
	27	static inline int pgd_bad(pgd_t pgd) { return 0; }
	28	static inline int pgd_present(pgd_t pgd) { return 1; }
	29	static inline void pgd_clear(pgd_t *pgd) { }
	30	#define pud_ERROR(pud) (pgd_ERROR((pud).pgd))
	31
	32	#define pgd_populate(mm, pgd, pud) do { } while (0)
	33	/*
	34	* (puds are folded into pgds so this doesn't get actually called,
	35	* but the define is needed for a generic inline function.)
	36	*/
	37	#define set_pgd(pgdptr, pgdval) set_pud((pud_t *)(pgdptr), (pud_t) { pgdval })
	38
	39	static inline pud_t pud_offset(pgd_t pgd, unsigned long address)
	40	{
	41	return (pud_t *)pgd;
	42	}
	43
	44	#define pud_val(x) (pgd_val((x).pgd))
	45	#define __pud(x) ((pud_t) { __pgd(x) })
	46
	47	#define pgd_page(pgd) (pud_page((pud_t){ pgd }))
	48	#define pgd_page_vaddr(pgd) (pud_page_vaddr((pud_t){ pgd }))
	49
	50	/*
	51	* allocating and freeing a pud is trivial: the 1-entry pud is
	52	* inside the pgd, so has no extra memory associated with it.
	53	*/
	54	#define pud_alloc_one(mm, address) NULL
	55	#define pud_free(mm, x) do { } while (0)
	56	#define __pud_free_tlb(tlb, x, a) do { } while (0)
	57
	58	#undef pud_addr_end
	59	#define pud_addr_end(addr, end) (end)
	60
	61	#endif /* __ASSEMBLY__ */
	62	#endif /* _PGTABLE_NOP4D_HACK_H */