[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / asm-powerpc / pgtable-4k.h

/*
 * Entries per page directory level.  The PTE level must use a 64b record
 * for each page table entry.  The PMD and PGD level use a 32b record for
 * each entry by assuming that each entry is page aligned.
 */
#define PTE_INDEX_SIZE  9
#define PMD_INDEX_SIZE  7
#define PUD_INDEX_SIZE  7
#define PGD_INDEX_SIZE  9

#define PTE_TABLE_SIZE	(sizeof(pte_t) << PTE_INDEX_SIZE)
#define PMD_TABLE_SIZE	(sizeof(pmd_t) << PMD_INDEX_SIZE)
#define PUD_TABLE_SIZE	(sizeof(pud_t) << PUD_INDEX_SIZE)
#define PGD_TABLE_SIZE	(sizeof(pgd_t) << PGD_INDEX_SIZE)

#define PTRS_PER_PTE	(1 << PTE_INDEX_SIZE)
#define PTRS_PER_PMD	(1 << PMD_INDEX_SIZE)
#define PTRS_PER_PUD	(1 << PMD_INDEX_SIZE)
#define PTRS_PER_PGD	(1 << PGD_INDEX_SIZE)

/* PMD_SHIFT determines what a second-level page table entry can map */
#define PMD_SHIFT	(PAGE_SHIFT + PTE_INDEX_SIZE)
#define PMD_SIZE	(1UL << PMD_SHIFT)
#define PMD_MASK	(~(PMD_SIZE-1))

/* With 4k base page size, hugepage PTEs go at the PMD level */
#define MIN_HUGEPTE_SHIFT	PMD_SHIFT

/* PUD_SHIFT determines what a third-level page table entry can map */
#define PUD_SHIFT	(PMD_SHIFT + PMD_INDEX_SIZE)
#define PUD_SIZE	(1UL << PUD_SHIFT)
#define PUD_MASK	(~(PUD_SIZE-1))

/* PGDIR_SHIFT determines what a fourth-level page table entry can map */
#define PGDIR_SHIFT	(PUD_SHIFT + PUD_INDEX_SIZE)
#define PGDIR_SIZE	(1UL << PGDIR_SHIFT)
#define PGDIR_MASK	(~(PGDIR_SIZE-1))

/* PTE bits */
#define _PAGE_SECONDARY 0x8000 /* software: HPTE is in secondary group */
#define _PAGE_GROUP_IX  0x7000 /* software: HPTE index within group */
#define _PAGE_F_SECOND  _PAGE_SECONDARY
#define _PAGE_F_GIX     _PAGE_GROUP_IX

/* PTE flags to conserve for HPTE identification */
#define _PAGE_HPTEFLAGS (_PAGE_BUSY | _PAGE_HASHPTE | \
			 _PAGE_SECONDARY | _PAGE_GROUP_IX)

/* PAGE_MASK gives the right answer below, but only by accident */
/* It should be preserving the high 48 bits and then specifically */
/* preserving _PAGE_SECONDARY | _PAGE_GROUP_IX */
#define _PAGE_CHG_MASK	(PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | \
                         _PAGE_HPTEFLAGS)

/* Bits to mask out from a PMD to get to the PTE page */
#define PMD_MASKED_BITS		0
/* Bits to mask out from a PUD to get to the PMD page */
#define PUD_MASKED_BITS		0
/* Bits to mask out from a PGD to get to the PUD page */
#define PGD_MASKED_BITS		0

/* shift to put page number into pte */
#define PTE_RPN_SHIFT	(17)

#ifdef STRICT_MM_TYPECHECKS
#define __real_pte(e,p)		((real_pte_t){(e)})
#define __rpte_to_pte(r)	((r).pte)
#else
#define __real_pte(e,p)		(e)
#define __rpte_to_pte(r)	(__pte(r))
#endif
#define __rpte_to_hidx(r,index)	(pte_val(__rpte_to_pte(r)) >> 12)

#define pte_iterate_hashed_subpages(rpte, psize, va, index, shift)       \
	do {							         \
		index = 0;					         \
		shift = mmu_psize_defs[psize].shift;		         \

#define pte_iterate_hashed_end() } while(0)

#define pte_pagesize_index(pte)	MMU_PAGE_4K

/*
 * 4-level page tables related bits
 */

#define pgd_none(pgd)		(!pgd_val(pgd))
#define pgd_bad(pgd)		(pgd_val(pgd) == 0)
#define pgd_present(pgd)	(pgd_val(pgd) != 0)
#define pgd_clear(pgdp)		(pgd_val(*(pgdp)) = 0)
#define pgd_page_vaddr(pgd)	(pgd_val(pgd) & ~PGD_MASKED_BITS)
#define pgd_page(pgd)		virt_to_page(pgd_page_vaddr(pgd))

#define pud_offset(pgdp, addr)	\
  (((pud_t *) pgd_page_vaddr(*(pgdp))) + \
    (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)))

#define pud_ERROR(e) \
	printk("%s:%d: bad pud %08lx.\n", __FILE__, __LINE__, pud_val(e))
Commit	Line	Data
3c726f8d BH	1	/*
	2	* Entries per page directory level. The PTE level must use a 64b record
	3	* for each page table entry. The PMD and PGD level use a 32b record for
	4	* each entry by assuming that each entry is page aligned.
	5	*/
	6	#define PTE_INDEX_SIZE 9
	7	#define PMD_INDEX_SIZE 7
	8	#define PUD_INDEX_SIZE 7
	9	#define PGD_INDEX_SIZE 9
	10
	11	#define PTE_TABLE_SIZE (sizeof(pte_t) << PTE_INDEX_SIZE)
	12	#define PMD_TABLE_SIZE (sizeof(pmd_t) << PMD_INDEX_SIZE)
	13	#define PUD_TABLE_SIZE (sizeof(pud_t) << PUD_INDEX_SIZE)
	14	#define PGD_TABLE_SIZE (sizeof(pgd_t) << PGD_INDEX_SIZE)
	15
	16	#define PTRS_PER_PTE (1 << PTE_INDEX_SIZE)
	17	#define PTRS_PER_PMD (1 << PMD_INDEX_SIZE)
	18	#define PTRS_PER_PUD (1 << PMD_INDEX_SIZE)
	19	#define PTRS_PER_PGD (1 << PGD_INDEX_SIZE)
	20
	21	/* PMD_SHIFT determines what a second-level page table entry can map */
	22	#define PMD_SHIFT (PAGE_SHIFT + PTE_INDEX_SIZE)
	23	#define PMD_SIZE (1UL << PMD_SHIFT)
	24	#define PMD_MASK (~(PMD_SIZE-1))
	25
7d24f0b8 DG	26	/* With 4k base page size, hugepage PTEs go at the PMD level */
	27	#define MIN_HUGEPTE_SHIFT PMD_SHIFT
	28
3c726f8d BH	29	/* PUD_SHIFT determines what a third-level page table entry can map */
	30	#define PUD_SHIFT (PMD_SHIFT + PMD_INDEX_SIZE)
	31	#define PUD_SIZE (1UL << PUD_SHIFT)
	32	#define PUD_MASK (~(PUD_SIZE-1))
	33
	34	/* PGDIR_SHIFT determines what a fourth-level page table entry can map */
	35	#define PGDIR_SHIFT (PUD_SHIFT + PUD_INDEX_SIZE)
	36	#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
	37	#define PGDIR_MASK (~(PGDIR_SIZE-1))
	38
	39	/* PTE bits */
	40	#define _PAGE_SECONDARY 0x8000 /* software: HPTE is in secondary group */
	41	#define _PAGE_GROUP_IX 0x7000 /* software: HPTE index within group */
	42	#define _PAGE_F_SECOND _PAGE_SECONDARY
	43	#define _PAGE_F_GIX _PAGE_GROUP_IX
	44
	45	/* PTE flags to conserve for HPTE identification */
	46	#define _PAGE_HPTEFLAGS (_PAGE_BUSY \| _PAGE_HASHPTE \| \
	47	_PAGE_SECONDARY \| _PAGE_GROUP_IX)
	48
	49	/* PAGE_MASK gives the right answer below, but only by accident */
	50	/* It should be preserving the high 48 bits and then specifically */
	51	/* preserving _PAGE_SECONDARY \| _PAGE_GROUP_IX */
	52	#define _PAGE_CHG_MASK (PAGE_MASK \| _PAGE_ACCESSED \| _PAGE_DIRTY \| \
	53	_PAGE_HPTEFLAGS)
	54
	55	/* Bits to mask out from a PMD to get to the PTE page */
	56	#define PMD_MASKED_BITS 0
	57	/* Bits to mask out from a PUD to get to the PMD page */
	58	#define PUD_MASKED_BITS 0
	59	/* Bits to mask out from a PGD to get to the PUD page */
	60	#define PGD_MASKED_BITS 0
	61
	62	/* shift to put page number into pte */
	63	#define PTE_RPN_SHIFT (17)
	64
20f4eb3e DG	65	#ifdef STRICT_MM_TYPECHECKS
	66	#define __real_pte(e,p) ((real_pte_t){(e)})
	67	#define __rpte_to_pte(r) ((r).pte)
	68	#else
	69	#define __real_pte(e,p) (e)
	70	#define __rpte_to_pte(r) (__pte(r))
	71	#endif
	72	#define __rpte_to_hidx(r,index) (pte_val(__rpte_to_pte(r)) >> 12)
3c726f8d BH	73
	74	#define pte_iterate_hashed_subpages(rpte, psize, va, index, shift) \
	75	do { \
	76	index = 0; \
	77	shift = mmu_psize_defs[psize].shift; \
	78
	79	#define pte_iterate_hashed_end() } while(0)
	80
bf72aeba PM	81	#define pte_pagesize_index(pte) MMU_PAGE_4K
bf72aeba PM	82
3c726f8d BH	83	/*
	84	* 4-level page tables related bits
	85	*/
	86
	87	#define pgd_none(pgd) (!pgd_val(pgd))
	88	#define pgd_bad(pgd) (pgd_val(pgd) == 0)
	89	#define pgd_present(pgd) (pgd_val(pgd) != 0)
	90	#define pgd_clear(pgdp) (pgd_val(*(pgdp)) = 0)
46a82b2d DM	91	#define pgd_page_vaddr(pgd) (pgd_val(pgd) & ~PGD_MASKED_BITS)
46a82b2d DM	92	#define pgd_page(pgd) virt_to_page(pgd_page_vaddr(pgd))
3c726f8d BH	93
3c726f8d BH	94	#define pud_offset(pgdp, addr) \
46a82b2d	95	(((pud_t ) pgd_page_vaddr((pgdp))) + \
3c726f8d BH	96	(((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)))
	97
	98	#define pud_ERROR(e) \
141aa59b	99	printk("%s:%d: bad pud %08lx.\n", __FILE__, __LINE__, pud_val(e))