[deliverable/linux.git] / arch / arc / include / asm / pgtable.h

/*
 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * vineetg: May 2011
 *  -Folded PAGE_PRESENT (used by VM) and PAGE_VALID (used by MMU) into 1.
 *     They are semantically the same although in different contexts
 *     VALID marks a TLB entry exists and it will only happen if PRESENT
 *  - Utilise some unused free bits to confine PTE flags to 12 bits
 *     This is a must for 4k pg-sz
 *
 * vineetg: Mar 2011 - changes to accommodate MMU TLB Page Descriptor mods
 *  -TLB Locking never really existed, except for initial specs
 *  -SILENT_xxx not needed for our port
 *  -Per my request, MMU V3 changes the layout of some of the bits
 *     to avoid a few shifts in TLB Miss handlers.
 *
 * vineetg: April 2010
 *  -PGD entry no longer contains any flags. If empty it is 0, otherwise has
 *   Pg-Tbl ptr. Thus pmd_present(), pmd_valid(), pmd_set( ) become simpler
 *
 * vineetg: April 2010
 *  -Switched form 8:11:13 split for page table lookup to 11:8:13
 *  -this speeds up page table allocation itself as we now have to memset 1K
 *    instead of 8k per page table.
 * -TODO: Right now page table alloc is 8K and rest 7K is unused
 *    need to optimise it
 *
 * Amit Bhor, Sameer Dhavale: Codito Technologies 2004
 */

#ifndef _ASM_ARC_PGTABLE_H
#define _ASM_ARC_PGTABLE_H

#include <asm/page.h>
#include <asm/mmu.h>
#include <asm-generic/pgtable-nopmd.h>
#include <linux/const.h>

/**************************************************************************
 * Page Table Flags
 *
 * ARC700 MMU only deals with softare managed TLB entries.
 * Page Tables are purely for Linux VM's consumption and the bits below are
 * suited to that (uniqueness). Hence some are not implemented in the TLB and
 * some have different value in TLB.
 * e.g. MMU v2: K_READ bit is 8 and so is GLOBAL (possible becoz they live in
 *      seperate PD0 and PD1, which combined forms a translation entry)
 *      while for PTE perspective, they are 8 and 9 respectively
 * with MMU v3: Most bits (except SHARED) represent the exact hardware pos
 *      (saves some bit shift ops in TLB Miss hdlrs)
 */

#if (CONFIG_ARC_MMU_VER <= 2)

#define _PAGE_ACCESSED      (1<<1)	/* Page is accessed (S) */
#define _PAGE_CACHEABLE     (1<<2)	/* Page is cached (H) */
#define _PAGE_EXECUTE       (1<<3)	/* Page has user execute perm (H) */
#define _PAGE_WRITE         (1<<4)	/* Page has user write perm (H) */
#define _PAGE_READ          (1<<5)	/* Page has user read perm (H) */
#define _PAGE_DIRTY         (1<<6)	/* Page modified (dirty) (S) */
#define _PAGE_SPECIAL       (1<<7)
#define _PAGE_GLOBAL        (1<<8)	/* Page is global (H) */
#define _PAGE_PRESENT       (1<<10)	/* TLB entry is valid (H) */

#else	/* MMU v3 onwards */

#define _PAGE_CACHEABLE     (1<<0)	/* Page is cached (H) */
#define _PAGE_EXECUTE       (1<<1)	/* Page has user execute perm (H) */
#define _PAGE_WRITE         (1<<2)	/* Page has user write perm (H) */
#define _PAGE_READ          (1<<3)	/* Page has user read perm (H) */
#define _PAGE_ACCESSED      (1<<4)	/* Page is accessed (S) */
#define _PAGE_DIRTY         (1<<5)	/* Page modified (dirty) (S) */
#define _PAGE_SPECIAL       (1<<6)

#if (CONFIG_ARC_MMU_VER >= 4)
#define _PAGE_WTHRU         (1<<7)	/* Page cache mode write-thru (H) */
#endif

#define _PAGE_GLOBAL        (1<<8)	/* Page is global (H) */
#define _PAGE_PRESENT       (1<<9)	/* TLB entry is valid (H) */

#if (CONFIG_ARC_MMU_VER >= 4)
#define _PAGE_HW_SZ         (1<<10)	/* Page Size indicator (H): 0 normal, 1 super */
#endif

#define _PAGE_SHARED_CODE   (1<<11)	/* Shared Code page with cmn vaddr
					   usable for shared TLB entries (H) */

#define _PAGE_UNUSED_BIT    (1<<12)
#endif

/* vmalloc permissions */
#define _K_PAGE_PERMS  (_PAGE_EXECUTE | _PAGE_WRITE | _PAGE_READ | \
			_PAGE_GLOBAL | _PAGE_PRESENT)

#ifndef CONFIG_ARC_CACHE_PAGES
#undef _PAGE_CACHEABLE
#define _PAGE_CACHEABLE 0
#endif

#ifndef _PAGE_HW_SZ
#define _PAGE_HW_SZ	0
#endif

/* Defaults for every user page */
#define ___DEF (_PAGE_PRESENT | _PAGE_CACHEABLE)

/* Set of bits not changed in pte_modify */
#define _PAGE_CHG_MASK	(PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)

/* More Abbrevaited helpers */
#define PAGE_U_NONE     __pgprot(___DEF)
#define PAGE_U_R        __pgprot(___DEF | _PAGE_READ)
#define PAGE_U_W_R      __pgprot(___DEF | _PAGE_READ | _PAGE_WRITE)
#define PAGE_U_X_R      __pgprot(___DEF | _PAGE_READ | _PAGE_EXECUTE)
#define PAGE_U_X_W_R    __pgprot(___DEF | _PAGE_READ | _PAGE_WRITE | \
						       _PAGE_EXECUTE)

#define PAGE_SHARED	PAGE_U_W_R

/* While kernel runs out of unstranslated space, vmalloc/modules use a chunk of
 * user vaddr space - visible in all addr spaces, but kernel mode only
 * Thus Global, all-kernel-access, no-user-access, cached
 */
#define PAGE_KERNEL          __pgprot(_K_PAGE_PERMS | _PAGE_CACHEABLE)

/* ioremap */
#define PAGE_KERNEL_NO_CACHE __pgprot(_K_PAGE_PERMS)

/* Masks for actual TLB "PD"s */
#define PTE_BITS_IN_PD0		(_PAGE_GLOBAL | _PAGE_PRESENT | _PAGE_HW_SZ)
#define PTE_BITS_RWX		(_PAGE_EXECUTE | _PAGE_WRITE | _PAGE_READ)

#ifdef CONFIG_ARC_HAS_PAE40
#define PTE_BITS_NON_RWX_IN_PD1	(0xff00000000 | PAGE_MASK | _PAGE_CACHEABLE)
#else
#define PTE_BITS_NON_RWX_IN_PD1	(PAGE_MASK | _PAGE_CACHEABLE)
#endif

/**************************************************************************
 * Mapping of vm_flags (Generic VM) to PTE flags (arch specific)
 *
 * Certain cases have 1:1 mapping
 *  e.g. __P101 means VM_READ, VM_EXEC and !VM_SHARED
 *       which directly corresponds to  PAGE_U_X_R
 *
 * Other rules which cause the divergence from 1:1 mapping
 *
 *  1. Although ARC700 can do exclusive execute/write protection (meaning R
 *     can be tracked independet of X/W unlike some other CPUs), still to
 *     keep things consistent with other archs:
 *      -Write implies Read:   W => R
 *      -Execute implies Read: X => R
 *
 *  2. Pvt Writable doesn't have Write Enabled initially: Pvt-W => !W
 *     This is to enable COW mechanism
 */
	/* xwr */
#define __P000  PAGE_U_NONE
#define __P001  PAGE_U_R
#define __P010  PAGE_U_R	/* Pvt-W => !W */
#define __P011  PAGE_U_R	/* Pvt-W => !W */
#define __P100  PAGE_U_X_R	/* X => R */
#define __P101  PAGE_U_X_R
#define __P110  PAGE_U_X_R	/* Pvt-W => !W and X => R */
#define __P111  PAGE_U_X_R	/* Pvt-W => !W */

#define __S000  PAGE_U_NONE
#define __S001  PAGE_U_R
#define __S010  PAGE_U_W_R	/* W => R */
#define __S011  PAGE_U_W_R
#define __S100  PAGE_U_X_R	/* X => R */
#define __S101  PAGE_U_X_R
#define __S110  PAGE_U_X_W_R	/* X => R */
#define __S111  PAGE_U_X_W_R

/****************************************************************
 * 2 tier (PGD:PTE) software page walker
 *
 * [31]		    32 bit virtual address              [0]
 * -------------------------------------------------------
 * |               | <------------ PGDIR_SHIFT ----------> |
 * |		   |					 |
 * | BITS_FOR_PGD  |  BITS_FOR_PTE  | <-- PAGE_SHIFT --> |
 * -------------------------------------------------------
 *       |                  |                |
 *       |                  |                --> off in page frame
 *       |                  ---> index into Page Table
 *       ----> index into Page Directory
 *
 * In a single page size configuration, only PAGE_SHIFT is fixed
 * So both PGD and PTE sizing can be tweaked
 *  e.g. 8K page (PAGE_SHIFT 13) can have
 *  - PGDIR_SHIFT 21  -> 11:8:13 address split
 *  - PGDIR_SHIFT 24  -> 8:11:13 address split
 *
 * If Super Page is configured, PGDIR_SHIFT becomes fixed too,
 * so the sizing flexibility is gone.
 */

#if defined(CONFIG_ARC_HUGEPAGE_16M)
#define PGDIR_SHIFT	24
#elif defined(CONFIG_ARC_HUGEPAGE_2M)
#define PGDIR_SHIFT	21
#else
/*
 * Only Normal page support so "hackable" (see comment above)
 * Default value provides 11:8:13 (8K), 11:9:12 (4K)
 */
#define PGDIR_SHIFT	21
#endif

#define BITS_FOR_PTE	(PGDIR_SHIFT - PAGE_SHIFT)
#define BITS_FOR_PGD	(32 - PGDIR_SHIFT)

#define PGDIR_SIZE	(1UL << PGDIR_SHIFT)	/* vaddr span, not PDG sz */
#define PGDIR_MASK	(~(PGDIR_SIZE-1))

#define	PTRS_PER_PTE	_BITUL(BITS_FOR_PTE)
#define	PTRS_PER_PGD	_BITUL(BITS_FOR_PGD)

/*
 * Number of entries a user land program use.
 * TASK_SIZE is the maximum vaddr that can be used by a userland program.
 */
#define	USER_PTRS_PER_PGD	(TASK_SIZE / PGDIR_SIZE)

/*
 * No special requirements for lowest virtual address we permit any user space
 * mapping to be mapped at.
 */
#define FIRST_USER_ADDRESS      0UL


/****************************************************************
 * Bucket load of VM Helpers
 */

#ifndef __ASSEMBLY__

#define pte_ERROR(e) \
	pr_crit("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
#define pgd_ERROR(e) \
	pr_crit("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))

/* the zero page used for uninitialized and anonymous pages */
extern char empty_zero_page[PAGE_SIZE];
#define ZERO_PAGE(vaddr)	(virt_to_page(empty_zero_page))

#define pte_unmap(pte)		do { } while (0)
#define pte_unmap_nested(pte)		do { } while (0)

#define set_pte(pteptr, pteval)	((*(pteptr)) = (pteval))
#define set_pmd(pmdptr, pmdval)	(*(pmdptr) = pmdval)

/* find the page descriptor of the Page Tbl ref by PMD entry */
#define pmd_page(pmd)		virt_to_page(pmd_val(pmd) & PAGE_MASK)

/* find the logical addr (phy for ARC) of the Page Tbl ref by PMD entry */
#define pmd_page_vaddr(pmd)	(pmd_val(pmd) & PAGE_MASK)

/* In a 2 level sys, setup the PGD entry with PTE value */
static inline void pmd_set(pmd_t *pmdp, pte_t *ptep)
{
	pmd_val(*pmdp) = (unsigned long)ptep;
}

#define pte_none(x)			(!pte_val(x))
#define pte_present(x)			(pte_val(x) & _PAGE_PRESENT)
#define pte_clear(mm, addr, ptep)	set_pte_at(mm, addr, ptep, __pte(0))

#define pmd_none(x)			(!pmd_val(x))
#define	pmd_bad(x)			((pmd_val(x) & ~PAGE_MASK))
#define pmd_present(x)			(pmd_val(x))
#define pmd_clear(xp)			do { pmd_val(*(xp)) = 0; } while (0)

#define pte_page(pte)		pfn_to_page(pte_pfn(pte))
#define mk_pte(page, prot)	pfn_pte(page_to_pfn(page), prot)
#define pfn_pte(pfn, prot)	(__pte(((pte_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)))

/* Don't use virt_to_pfn for macros below: could cause truncations for PAE40*/
#define pte_pfn(pte)		(pte_val(pte) >> PAGE_SHIFT)
#define __pte_index(addr)	(((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))

/*
 * pte_offset gets a @ptr to PMD entry (PGD in our 2-tier paging system)
 * and returns ptr to PTE entry corresponding to @addr
 */
#define pte_offset(dir, addr) ((pte_t *)(pmd_page_vaddr(*dir)) +\
					 __pte_index(addr))

/* No mapping of Page Tables in high mem etc, so following same as above */
#define pte_offset_kernel(dir, addr)		pte_offset(dir, addr)
#define pte_offset_map(dir, addr)		pte_offset(dir, addr)

/* Zoo of pte_xxx function */
#define pte_read(pte)		(pte_val(pte) & _PAGE_READ)
#define pte_write(pte)		(pte_val(pte) & _PAGE_WRITE)
#define pte_dirty(pte)		(pte_val(pte) & _PAGE_DIRTY)
#define pte_young(pte)		(pte_val(pte) & _PAGE_ACCESSED)
#define pte_special(pte)	(pte_val(pte) & _PAGE_SPECIAL)

#define PTE_BIT_FUNC(fn, op) \
	static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; }

PTE_BIT_FUNC(mknotpresent,	&= ~(_PAGE_PRESENT));
PTE_BIT_FUNC(wrprotect,	&= ~(_PAGE_WRITE));
PTE_BIT_FUNC(mkwrite,	|= (_PAGE_WRITE));
PTE_BIT_FUNC(mkclean,	&= ~(_PAGE_DIRTY));
PTE_BIT_FUNC(mkdirty,	|= (_PAGE_DIRTY));
PTE_BIT_FUNC(mkold,	&= ~(_PAGE_ACCESSED));
PTE_BIT_FUNC(mkyoung,	|= (_PAGE_ACCESSED));
PTE_BIT_FUNC(exprotect,	&= ~(_PAGE_EXECUTE));
PTE_BIT_FUNC(mkexec,	|= (_PAGE_EXECUTE));
PTE_BIT_FUNC(mkspecial,	|= (_PAGE_SPECIAL));
PTE_BIT_FUNC(mkhuge,	|= (_PAGE_HW_SZ));

#define __HAVE_ARCH_PTE_SPECIAL

static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
	return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
}

/* Macro to mark a page protection as uncacheable */
#define pgprot_noncached(prot)	(__pgprot(pgprot_val(prot) & ~_PAGE_CACHEABLE))

static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
			      pte_t *ptep, pte_t pteval)
{
	set_pte(ptep, pteval);
}

/*
 * All kernel related VM pages are in init's mm.
 */
#define pgd_offset_k(address)	pgd_offset(&init_mm, address)
#define pgd_index(addr)		((addr) >> PGDIR_SHIFT)
#define pgd_offset(mm, addr)	(((mm)->pgd)+pgd_index(addr))

/*
 * Macro to quickly access the PGD entry, utlising the fact that some
 * arch may cache the pointer to Page Directory of "current" task
 * in a MMU register
 *
 * Thus task->mm->pgd (3 pointer dereferences, cache misses etc simply
 * becomes read a register
 *
 * ********CAUTION*******:
 * Kernel code might be dealing with some mm_struct of NON "current"
 * Thus use this macro only when you are certain that "current" is current
 * e.g. when dealing with signal frame setup code etc
 */
#ifndef CONFIG_SMP
#define pgd_offset_fast(mm, addr)	\
({					\
	pgd_t *pgd_base = (pgd_t *) read_aux_reg(ARC_REG_SCRATCH_DATA0);  \
	pgd_base + pgd_index(addr);	\
})
#else
#define pgd_offset_fast(mm, addr)	pgd_offset(mm, addr)
#endif

extern pgd_t swapper_pg_dir[] __aligned(PAGE_SIZE);
void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
		      pte_t *ptep);

/* Encode swap {type,off} tuple into PTE
 * We reserve 13 bits for 5-bit @type, keeping bits 12-5 zero, ensuring that
 * PAGE_PRESENT is zero in a PTE holding swap "identifier"
 */
#define __swp_entry(type, off)	((swp_entry_t) { \
					((type) & 0x1f) | ((off) << 13) })

/* Decode a PTE containing swap "identifier "into constituents */
#define __swp_type(pte_lookalike)	(((pte_lookalike).val) & 0x1f)
#define __swp_offset(pte_lookalike)	((pte_lookalike).val << 13)

/* NOPs, to keep generic kernel happy */
#define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x)	((pte_t) { (x).val })

#define kern_addr_valid(addr)	(1)

/*
 * remap a physical page `pfn' of size `size' with page protection `prot'
 * into virtual address `from'
 */
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
#include <asm/hugepage.h>
#endif

#include <asm-generic/pgtable.h>

/* to cope with aliasing VIPT cache */
#define HAVE_ARCH_UNMAPPED_AREA

/*
 * No page table caches to initialise
 */
#define pgtable_cache_init()   do { } while (0)

#endif /* __ASSEMBLY__ */

#endif
Commit	Line	Data
5dda4dc5 VG	1	/*
	2	* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*
	8	* vineetg: May 2011
	9	* -Folded PAGE_PRESENT (used by VM) and PAGE_VALID (used by MMU) into 1.
	10	* They are semantically the same although in different contexts
	11	* VALID marks a TLB entry exists and it will only happen if PRESENT
	12	* - Utilise some unused free bits to confine PTE flags to 12 bits
	13	* This is a must for 4k pg-sz
	14	*
7423cc0c	15	* vineetg: Mar 2011 - changes to accommodate MMU TLB Page Descriptor mods
5dda4dc5 VG	16	* -TLB Locking never really existed, except for initial specs
	17	* -SILENT_xxx not needed for our port
	18	* -Per my request, MMU V3 changes the layout of some of the bits
	19	* to avoid a few shifts in TLB Miss handlers.
	20	*
	21	* vineetg: April 2010
	22	* -PGD entry no longer contains any flags. If empty it is 0, otherwise has
	23	* Pg-Tbl ptr. Thus pmd_present(), pmd_valid(), pmd_set( ) become simpler
	24	*
	25	* vineetg: April 2010
	26	* -Switched form 8:11:13 split for page table lookup to 11:8:13
	27	* -this speeds up page table allocation itself as we now have to memset 1K
	28	* instead of 8k per page table.
	29	* -TODO: Right now page table alloc is 8K and rest 7K is unused
	30	* need to optimise it
	31	*
	32	* Amit Bhor, Sameer Dhavale: Codito Technologies 2004
	33	*/
	34
	35	#ifndef _ASM_ARC_PGTABLE_H
	36	#define _ASM_ARC_PGTABLE_H
	37
	38	#include <asm/page.h>
	39	#include <asm/mmu.h>
	40	#include <asm-generic/pgtable-nopmd.h>
d4084645	41	#include <linux/const.h>
5dda4dc5 VG	42
	43	/**************************************************************************
	44	* Page Table Flags
	45	*
	46	* ARC700 MMU only deals with softare managed TLB entries.
	47	* Page Tables are purely for Linux VM's consumption and the bits below are
	48	* suited to that (uniqueness). Hence some are not implemented in the TLB and
	49	* some have different value in TLB.
	50	* e.g. MMU v2: K_READ bit is 8 and so is GLOBAL (possible becoz they live in
	51	* seperate PD0 and PD1, which combined forms a translation entry)
	52	* while for PTE perspective, they are 8 and 9 respectively
	53	* with MMU v3: Most bits (except SHARED) represent the exact hardware pos
	54	* (saves some bit shift ops in TLB Miss hdlrs)
	55	*/
	56
	57	#if (CONFIG_ARC_MMU_VER <= 2)
	58
	59	#define _PAGE_ACCESSED (1<<1) /* Page is accessed (S) */
	60	#define _PAGE_CACHEABLE (1<<2) /* Page is cached (H) */
64b703ef VG	61	#define _PAGE_EXECUTE (1<<3) /* Page has user execute perm (H) */
	62	#define _PAGE_WRITE (1<<4) /* Page has user write perm (H) */
	63	#define _PAGE_READ (1<<5) /* Page has user read perm (H) */
129cbed5	64	#define _PAGE_DIRTY (1<<6) /* Page modified (dirty) (S) */
24830fc7	65	#define _PAGE_SPECIAL (1<<7)
d091fcb9 VG	66	#define _PAGE_GLOBAL (1<<8) /* Page is global (H) */
d091fcb9 VG	67	#define _PAGE_PRESENT (1<<10) /* TLB entry is valid (H) */
5dda4dc5	68
64b703ef	69	#else /* MMU v3 onwards */
5dda4dc5	70
5dda4dc5	71	#define _PAGE_CACHEABLE (1<<0) /* Page is cached (H) */
64b703ef VG	72	#define _PAGE_EXECUTE (1<<1) /* Page has user execute perm (H) */
	73	#define _PAGE_WRITE (1<<2) /* Page has user write perm (H) */
	74	#define _PAGE_READ (1<<3) /* Page has user read perm (H) */
d091fcb9	75	#define _PAGE_ACCESSED (1<<4) /* Page is accessed (S) */
129cbed5	76	#define _PAGE_DIRTY (1<<5) /* Page modified (dirty) (S) */
24830fc7	77	#define _PAGE_SPECIAL (1<<6)
d7a512bf VG	78
	79	#if (CONFIG_ARC_MMU_VER >= 4)
	80	#define _PAGE_WTHRU (1<<7) /* Page cache mode write-thru (H) */
	81	#endif
	82
5dda4dc5 VG	83	#define _PAGE_GLOBAL (1<<8) /* Page is global (H) */
5dda4dc5 VG	84	#define _PAGE_PRESENT (1<<9) /* TLB entry is valid (H) */
d7a512bf VG	85
d7a512bf VG	86	#if (CONFIG_ARC_MMU_VER >= 4)
fe6c1b86	87	#define _PAGE_HW_SZ (1<<10) /* Page Size indicator (H): 0 normal, 1 super */
d7a512bf VG	88	#endif
d7a512bf VG	89
d091fcb9	90	#define _PAGE_SHARED_CODE (1<<11) /* Shared Code page with cmn vaddr
5dda4dc5	91	usable for shared TLB entries (H) */
fe6c1b86 VG	92
fe6c1b86 VG	93	#define _PAGE_UNUSED_BIT (1<<12)
5dda4dc5 VG	94	#endif
5dda4dc5 VG	95
64b703ef VG	96	/* vmalloc permissions */
64b703ef VG	97	#define _K_PAGE_PERMS (_PAGE_EXECUTE \| _PAGE_WRITE \| _PAGE_READ \| \
a950549c	98	_PAGE_GLOBAL \| _PAGE_PRESENT)
5dda4dc5	99
129cbed5 VG	100	#ifndef CONFIG_ARC_CACHE_PAGES
	101	#undef _PAGE_CACHEABLE
	102	#define _PAGE_CACHEABLE 0
5dda4dc5 VG	103	#endif
5dda4dc5 VG	104
fe6c1b86 VG	105	#ifndef _PAGE_HW_SZ
	106	#define _PAGE_HW_SZ 0
	107	#endif
	108
129cbed5 VG	109	/* Defaults for every user page */
129cbed5 VG	110	#define ___DEF (_PAGE_PRESENT \| _PAGE_CACHEABLE)
a950549c	111
5dda4dc5	112	/* Set of bits not changed in pte_modify */
129cbed5	113	#define _PAGE_CHG_MASK (PAGE_MASK \| _PAGE_ACCESSED \| _PAGE_DIRTY)
5dda4dc5 VG	114
	115	/* More Abbrevaited helpers */
	116	#define PAGE_U_NONE __pgprot(___DEF)
	117	#define PAGE_U_R __pgprot(___DEF \| _PAGE_READ)
	118	#define PAGE_U_W_R __pgprot(___DEF \| _PAGE_READ \| _PAGE_WRITE)
	119	#define PAGE_U_X_R __pgprot(___DEF \| _PAGE_READ \| _PAGE_EXECUTE)
	120	#define PAGE_U_X_W_R __pgprot(___DEF \| _PAGE_READ \| _PAGE_WRITE \| \
	121	_PAGE_EXECUTE)
	122
	123	#define PAGE_SHARED PAGE_U_W_R
	124
64b703ef VG	125	/* While kernel runs out of unstranslated space, vmalloc/modules use a chunk of
64b703ef VG	126	* user vaddr space - visible in all addr spaces, but kernel mode only
5dda4dc5 VG	127	* Thus Global, all-kernel-access, no-user-access, cached
5dda4dc5 VG	128	*/
129cbed5	129	#define PAGE_KERNEL __pgprot(_K_PAGE_PERMS \| _PAGE_CACHEABLE)
5dda4dc5 VG	130
5dda4dc5 VG	131	/* ioremap */
a950549c	132	#define PAGE_KERNEL_NO_CACHE __pgprot(_K_PAGE_PERMS)
5dda4dc5	133
da1677b0	134	/* Masks for actual TLB "PD"s */
fe6c1b86	135	#define PTE_BITS_IN_PD0 (_PAGE_GLOBAL \| _PAGE_PRESENT \| _PAGE_HW_SZ)
64b703ef	136	#define PTE_BITS_RWX (_PAGE_EXECUTE \| _PAGE_WRITE \| _PAGE_READ)
5a364c2a VG	137
	138	#ifdef CONFIG_ARC_HAS_PAE40
	139	#define PTE_BITS_NON_RWX_IN_PD1 (0xff00000000 \| PAGE_MASK \| _PAGE_CACHEABLE)
	140	#else
64b703ef	141	#define PTE_BITS_NON_RWX_IN_PD1 (PAGE_MASK \| _PAGE_CACHEABLE)
5a364c2a	142	#endif
da1677b0	143
5dda4dc5 VG	144	/**************************************************************************
	145	* Mapping of vm_flags (Generic VM) to PTE flags (arch specific)
	146	*
	147	* Certain cases have 1:1 mapping
	148	* e.g. __P101 means VM_READ, VM_EXEC and !VM_SHARED
	149	* which directly corresponds to PAGE_U_X_R
	150	*
	151	* Other rules which cause the divergence from 1:1 mapping
	152	*
	153	* 1. Although ARC700 can do exclusive execute/write protection (meaning R
	154	* can be tracked independet of X/W unlike some other CPUs), still to
	155	* keep things consistent with other archs:
	156	* -Write implies Read: W => R
	157	* -Execute implies Read: X => R
	158	*
	159	* 2. Pvt Writable doesn't have Write Enabled initially: Pvt-W => !W
	160	* This is to enable COW mechanism
	161	*/
	162	/* xwr */
	163	#define __P000 PAGE_U_NONE
	164	#define __P001 PAGE_U_R
	165	#define __P010 PAGE_U_R /* Pvt-W => !W */
	166	#define __P011 PAGE_U_R /* Pvt-W => !W */
	167	#define __P100 PAGE_U_X_R /* X => R */
	168	#define __P101 PAGE_U_X_R
	169	#define __P110 PAGE_U_X_R /* Pvt-W => !W and X => R */
	170	#define __P111 PAGE_U_X_R /* Pvt-W => !W */
	171
	172	#define __S000 PAGE_U_NONE
	173	#define __S001 PAGE_U_R
	174	#define __S010 PAGE_U_W_R /* W => R */
	175	#define __S011 PAGE_U_W_R
	176	#define __S100 PAGE_U_X_R /* X => R */
	177	#define __S101 PAGE_U_X_R
	178	#define __S110 PAGE_U_X_W_R /* X => R */
	179	#define __S111 PAGE_U_X_W_R
	180
	181	/****************************************************************
37eda9df	182	* 2 tier (PGD:PTE) software page walker
5dda4dc5	183	*
37eda9df	184	* [31] 32 bit virtual address [0]
5dda4dc5	185	* -------------------------------------------------------
37eda9df VG	186	* \| \| <------------ PGDIR_SHIFT ----------> \|
	187	* \| \| \|
	188	* \| BITS_FOR_PGD \| BITS_FOR_PTE \| <-- PAGE_SHIFT --> \|
5dda4dc5 VG	189	* -------------------------------------------------------
	190	* \| \| \|
	191	* \| \| --> off in page frame
5dda4dc5	192	* \| ---> index into Page Table
5dda4dc5	193	* ----> index into Page Directory
37eda9df VG	194	*
	195	* In a single page size configuration, only PAGE_SHIFT is fixed
	196	* So both PGD and PTE sizing can be tweaked
	197	* e.g. 8K page (PAGE_SHIFT 13) can have
	198	* - PGDIR_SHIFT 21 -> 11:8:13 address split
	199	* - PGDIR_SHIFT 24 -> 8:11:13 address split
	200	*
	201	* If Super Page is configured, PGDIR_SHIFT becomes fixed too,
	202	* so the sizing flexibility is gone.
5dda4dc5 VG	203	*/
5dda4dc5 VG	204
37eda9df VG	205	#if defined(CONFIG_ARC_HUGEPAGE_16M)
	206	#define PGDIR_SHIFT 24
	207	#elif defined(CONFIG_ARC_HUGEPAGE_2M)
	208	#define PGDIR_SHIFT 21
	209	#else
	210	/*
	211	* Only Normal page support so "hackable" (see comment above)
	212	* Default value provides 11:8:13 (8K), 11:9:12 (4K)
	213	*/
	214	#define PGDIR_SHIFT 21
5dda4dc5 VG	215	#endif
5dda4dc5 VG	216
37eda9df VG	217	#define BITS_FOR_PTE (PGDIR_SHIFT - PAGE_SHIFT)
37eda9df VG	218	#define BITS_FOR_PGD (32 - PGDIR_SHIFT)
5dda4dc5	219
5dda4dc5 VG	220	#define PGDIR_SIZE (1UL << PGDIR_SHIFT) /* vaddr span, not PDG sz */
	221	#define PGDIR_MASK (~(PGDIR_SIZE-1))
	222
d4084645 AB	223	#define PTRS_PER_PTE _BITUL(BITS_FOR_PTE)
	224	#define PTRS_PER_PGD _BITUL(BITS_FOR_PGD)
	225
5dda4dc5 VG	226	/*
	227	* Number of entries a user land program use.
	228	* TASK_SIZE is the maximum vaddr that can be used by a userland program.
	229	*/
	230	#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
	231
	232	/*
	233	* No special requirements for lowest virtual address we permit any user space
	234	* mapping to be mapped at.
	235	*/
d016bf7e	236	#define FIRST_USER_ADDRESS 0UL
5dda4dc5 VG	237
	238
	239	/****************************************************************
	240	* Bucket load of VM Helpers
	241	*/
	242
	243	#ifndef __ASSEMBLY__
	244
	245	#define pte_ERROR(e) \
	246	pr_crit("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
	247	#define pgd_ERROR(e) \
	248	pr_crit("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
	249
	250	/* the zero page used for uninitialized and anonymous pages */
	251	extern char empty_zero_page[PAGE_SIZE];
	252	#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
	253
	254	#define pte_unmap(pte) do { } while (0)
	255	#define pte_unmap_nested(pte) do { } while (0)
	256
	257	#define set_pte(pteptr, pteval) ((*(pteptr)) = (pteval))
	258	#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
	259
	260	/* find the page descriptor of the Page Tbl ref by PMD entry */
	261	#define pmd_page(pmd) virt_to_page(pmd_val(pmd) & PAGE_MASK)
	262
	263	/* find the logical addr (phy for ARC) of the Page Tbl ref by PMD entry */
	264	#define pmd_page_vaddr(pmd) (pmd_val(pmd) & PAGE_MASK)
	265
	266	/* In a 2 level sys, setup the PGD entry with PTE value */
	267	static inline void pmd_set(pmd_t pmdp, pte_t ptep)
	268	{
	269	pmd_val(*pmdp) = (unsigned long)ptep;
	270	}
	271
	272	#define pte_none(x) (!pte_val(x))
	273	#define pte_present(x) (pte_val(x) & _PAGE_PRESENT)
	274	#define pte_clear(mm, addr, ptep) set_pte_at(mm, addr, ptep, __pte(0))
	275
	276	#define pmd_none(x) (!pmd_val(x))
	277	#define pmd_bad(x) ((pmd_val(x) & ~PAGE_MASK))
	278	#define pmd_present(x) (pmd_val(x))
	279	#define pmd_clear(xp) do { pmd_val(*(xp)) = 0; } while (0)
	280
2519d753	281	#define pte_page(pte) pfn_to_page(pte_pfn(pte))
336e2136	282	#define mk_pte(page, prot) pfn_pte(page_to_pfn(page), prot)
2519d753 VG	283	#define pfn_pte(pfn, prot) (__pte(((pte_t)(pfn) << PAGE_SHIFT) \| pgprot_val(prot)))
	284
	285	/* Don't use virt_to_pfn for macros below: could cause truncations for PAE40*/
	286	#define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT)
	287	#define __pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
5dda4dc5 VG	288
	289	/*
	290	* pte_offset gets a @ptr to PMD entry (PGD in our 2-tier paging system)
	291	* and returns ptr to PTE entry corresponding to @addr
	292	*/
	293	#define pte_offset(dir, addr) ((pte_t )(pmd_page_vaddr(dir)) +\
	294	__pte_index(addr))
	295
	296	/* No mapping of Page Tables in high mem etc, so following same as above */
	297	#define pte_offset_kernel(dir, addr) pte_offset(dir, addr)
	298	#define pte_offset_map(dir, addr) pte_offset(dir, addr)
	299
	300	/* Zoo of pte_xxx function */
	301	#define pte_read(pte) (pte_val(pte) & _PAGE_READ)
	302	#define pte_write(pte) (pte_val(pte) & _PAGE_WRITE)
129cbed5	303	#define pte_dirty(pte) (pte_val(pte) & _PAGE_DIRTY)
5dda4dc5	304	#define pte_young(pte) (pte_val(pte) & _PAGE_ACCESSED)
24830fc7	305	#define pte_special(pte) (pte_val(pte) & _PAGE_SPECIAL)
5dda4dc5 VG	306
	307	#define PTE_BIT_FUNC(fn, op) \
	308	static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; }
	309
fe6c1b86	310	PTE_BIT_FUNC(mknotpresent, &= ~(_PAGE_PRESENT));
5dda4dc5 VG	311	PTE_BIT_FUNC(wrprotect, &= ~(_PAGE_WRITE));
5dda4dc5 VG	312	PTE_BIT_FUNC(mkwrite, \|= (_PAGE_WRITE));
129cbed5 VG	313	PTE_BIT_FUNC(mkclean, &= ~(_PAGE_DIRTY));
129cbed5 VG	314	PTE_BIT_FUNC(mkdirty, \|= (_PAGE_DIRTY));
5dda4dc5 VG	315	PTE_BIT_FUNC(mkold, &= ~(_PAGE_ACCESSED));
	316	PTE_BIT_FUNC(mkyoung, \|= (_PAGE_ACCESSED));
	317	PTE_BIT_FUNC(exprotect, &= ~(_PAGE_EXECUTE));
	318	PTE_BIT_FUNC(mkexec, \|= (_PAGE_EXECUTE));
24830fc7	319	PTE_BIT_FUNC(mkspecial, \|= (_PAGE_SPECIAL));
fe6c1b86	320	PTE_BIT_FUNC(mkhuge, \|= (_PAGE_HW_SZ));
5dda4dc5	321
24830fc7	322	#define __HAVE_ARCH_PTE_SPECIAL
5dda4dc5 VG	323
	324	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
	325	{
	326	return __pte((pte_val(pte) & _PAGE_CHG_MASK) \| pgprot_val(newprot));
	327	}
	328
	329	/* Macro to mark a page protection as uncacheable */
	330	#define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) & ~_PAGE_CACHEABLE))
	331
	332	static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
	333	pte_t *ptep, pte_t pteval)
	334	{
	335	set_pte(ptep, pteval);
	336	}
	337
	338	/*
	339	* All kernel related VM pages are in init's mm.
	340	*/
	341	#define pgd_offset_k(address) pgd_offset(&init_mm, address)
	342	#define pgd_index(addr) ((addr) >> PGDIR_SHIFT)
	343	#define pgd_offset(mm, addr) (((mm)->pgd)+pgd_index(addr))
	344
	345	/*
	346	* Macro to quickly access the PGD entry, utlising the fact that some
	347	* arch may cache the pointer to Page Directory of "current" task
	348	* in a MMU register
	349	*
	350	* Thus task->mm->pgd (3 pointer dereferences, cache misses etc simply
	351	* becomes read a register
	352	*
	353	* ******CAUTION*****:
	354	* Kernel code might be dealing with some mm_struct of NON "current"
	355	* Thus use this macro only when you are certain that "current" is current
	356	* e.g. when dealing with signal frame setup code etc
	357	*/
41195d23	358	#ifndef CONFIG_SMP
5dda4dc5 VG	359	#define pgd_offset_fast(mm, addr) \
	360	({ \
	361	pgd_t pgd_base = (pgd_t ) read_aux_reg(ARC_REG_SCRATCH_DATA0); \
	362	pgd_base + pgd_index(addr); \
	363	})
41195d23 VG	364	#else
	365	#define pgd_offset_fast(mm, addr) pgd_offset(mm, addr)
	366	#endif
5dda4dc5	367
5dda4dc5 VG	368	extern pgd_t swapper_pg_dir[] __aligned(PAGE_SIZE);
	369	void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
	370	pte_t *ptep);
	371
	372	/* Encode swap {type,off} tuple into PTE
	373	* We reserve 13 bits for 5-bit @type, keeping bits 12-5 zero, ensuring that
18747151	374	* PAGE_PRESENT is zero in a PTE holding swap "identifier"
5dda4dc5 VG	375	*/
	376	#define __swp_entry(type, off) ((swp_entry_t) { \
	377	((type) & 0x1f) \| ((off) << 13) })
	378
	379	/* Decode a PTE containing swap "identifier "into constituents */
	380	#define __swp_type(pte_lookalike) (((pte_lookalike).val) & 0x1f)
	381	#define __swp_offset(pte_lookalike) ((pte_lookalike).val << 13)
	382
	383	/* NOPs, to keep generic kernel happy */
	384	#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
	385	#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
	386
	387	#define kern_addr_valid(addr) (1)
	388
	389	/*
	390	* remap a physical page `pfn' of size `size' with page protection `prot'
	391	* into virtual address `from'
	392	*/
fe6c1b86 VG	393	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	394	#include <asm/hugepage.h>
	395	#endif
	396
5dda4dc5 VG	397	#include <asm-generic/pgtable.h>
5dda4dc5 VG	398
5bba49f5 VG	399	/* to cope with aliasing VIPT cache */
	400	#define HAVE_ARCH_UNMAPPED_AREA
	401
5dda4dc5 VG	402	/*
	403	* No page table caches to initialise
	404	*/
	405	#define pgtable_cache_init() do { } while (0)
	406
	407	#endif /* __ASSEMBLY__ */
	408
	409	#endif