[deliverable/linux.git] / include / asm-xtensa / pgtable.h

/*
 * include/asm-xtensa/pgtable.h
 *
 * 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.
 *
 * Copyright (C) 2001 - 2007 Tensilica Inc.
 */

#ifndef _XTENSA_PGTABLE_H
#define _XTENSA_PGTABLE_H

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

/*
 * We only use two ring levels, user and kernel space.
 */

#define USER_RING		1	/* user ring level */
#define KERNEL_RING		0	/* kernel ring level */

/*
 * The Xtensa architecture port of Linux has a two-level page table system,
 * i.e. the logical three-level Linux page table layout is folded.
 * Each task has the following memory page tables:
 *
 *   PGD table (page directory), ie. 3rd-level page table:
 *	One page (4 kB) of 1024 (PTRS_PER_PGD) pointers to PTE tables
 *	(Architectures that don't have the PMD folded point to the PMD tables)
 *
 *	The pointer to the PGD table for a given task can be retrieved from
 *	the task structure (struct task_struct*) t, e.g. current():
 *	  (t->mm ? t->mm : t->active_mm)->pgd
 *
 *   PMD tables (page middle-directory), ie. 2nd-level page tables:
 *	Absent for the Xtensa architecture (folded, PTRS_PER_PMD == 1).
 *
 *   PTE tables (page table entry), ie. 1st-level page tables:
 *	One page (4 kB) of 1024 (PTRS_PER_PTE) PTEs with a special PTE
 *	invalid_pte_table for absent mappings.
 *
 * The individual pages are 4 kB big with special pages for the empty_zero_page.
 */

#define PGDIR_SHIFT	22
#define PGDIR_SIZE	(1UL << PGDIR_SHIFT)
#define PGDIR_MASK	(~(PGDIR_SIZE-1))

/*
 * Entries per page directory level: we use two-level, so
 * we don't really have any PMD directory physically.
 */
#define PTRS_PER_PTE		1024
#define PTRS_PER_PTE_SHIFT	10
#define PTRS_PER_PGD		1024
#define PGD_ORDER		0
#define USER_PTRS_PER_PGD	(TASK_SIZE/PGDIR_SIZE)
#define FIRST_USER_ADDRESS	0
#define FIRST_USER_PGD_NR	(FIRST_USER_ADDRESS >> PGDIR_SHIFT)

/*
 * Virtual memory area. We keep a distance to other memory regions to be
 * on the safe side. We also use this area for cache aliasing.
 */

#define VMALLOC_START		0xC0000000
#define VMALLOC_END		0xC6FEFFFF
#define TLBTEMP_BASE_1		0xC6FF0000
#define TLBTEMP_BASE_2		0xC6FF8000
#define MODULE_START		0xC7000000
#define MODULE_END		0xC7FFFFFF

/*
 * Xtensa Linux config PTE layout (when present):
 *	31-12:	PPN
 *	11-6:	Software
 *	5-4:	RING
 *	3-0:	CA
 *
 * Similar to the Alpha and MIPS ports, we need to keep track of the ref
 * and mod bits in software.  We have a software "you can read
 * from this page" bit, and a hardware one which actually lets the
 * process read from the page.  On the same token we have a software
 * writable bit and the real hardware one which actually lets the
 * process write to the page.
 *
 * See further below for PTE layout for swapped-out pages.
 */

#define _PAGE_HW_EXEC		(1<<0)	/* hardware: page is executable */
#define _PAGE_HW_WRITE		(1<<1)	/* hardware: page is writable */

#define _PAGE_FILE		(1<<1)	/* non-linear mapping, if !present */
#define _PAGE_PROTNONE		(3<<0)	/* special case for VM_PROT_NONE */

/* None of these cache modes include MP coherency:  */
#define _PAGE_CA_BYPASS		(0<<2)	/* bypass, non-speculative */
#define _PAGE_CA_WB		(1<<2)	/* write-back */
#define _PAGE_CA_WT		(2<<2)	/* write-through */
#define _PAGE_CA_MASK		(3<<2)
#define _PAGE_INVALID		(3<<2)

#define _PAGE_USER		(1<<4)	/* user access (ring=1) */

/* Software */
#define _PAGE_WRITABLE_BIT	6
#define _PAGE_WRITABLE		(1<<6)	/* software: page writable */
#define _PAGE_DIRTY		(1<<7)	/* software: page dirty */
#define _PAGE_ACCESSED		(1<<8)	/* software: page accessed (read) */

/* On older HW revisions, we always have to set bit 0 */
#if XCHAL_HW_VERSION_MAJOR < 2000
# define _PAGE_VALID		(1<<0)
#else
# define _PAGE_VALID		0
#endif

#define _PAGE_CHG_MASK	(PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
#define _PAGE_PRESENT	(_PAGE_VALID | _PAGE_CA_WB | _PAGE_ACCESSED)

#ifdef CONFIG_MMU

#define PAGE_NONE	   __pgprot(_PAGE_INVALID | _PAGE_USER | _PAGE_PROTNONE)
#define PAGE_COPY	   __pgprot(_PAGE_PRESENT | _PAGE_USER)
#define PAGE_COPY_EXEC	   __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_HW_EXEC)
#define PAGE_READONLY	   __pgprot(_PAGE_PRESENT | _PAGE_USER)
#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_HW_EXEC)
#define PAGE_SHARED	   __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_WRITABLE)
#define PAGE_SHARED_EXEC \
	__pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_WRITABLE | _PAGE_HW_EXEC)
#define PAGE_KERNEL	   __pgprot(_PAGE_PRESENT | _PAGE_HW_WRITE)
#define PAGE_KERNEL_EXEC   __pgprot(_PAGE_PRESENT|_PAGE_HW_WRITE|_PAGE_HW_EXEC)

#if (DCACHE_WAY_SIZE > PAGE_SIZE)
# define _PAGE_DIRECTORY (_PAGE_VALID | _PAGE_ACCESSED)
#else
# define _PAGE_DIRECTORY (_PAGE_VALID | _PAGE_ACCESSED | _PAGE_CA_WB)
#endif

#else /* no mmu */

# define PAGE_NONE       __pgprot(0)
# define PAGE_SHARED     __pgprot(0)
# define PAGE_COPY       __pgprot(0)
# define PAGE_READONLY   __pgprot(0)
# define PAGE_KERNEL     __pgprot(0)

#endif

/*
 * On certain configurations of Xtensa MMUs (eg. the initial Linux config),
 * the MMU can't do page protection for execute, and considers that the same as
 * read.  Also, write permissions may imply read permissions.
 * What follows is the closest we can get by reasonable means..
 * See linux/mm/mmap.c for protection_map[] array that uses these definitions.
 */
#define __P000	PAGE_NONE		/* private --- */
#define __P001	PAGE_READONLY		/* private --r */
#define __P010	PAGE_COPY		/* private -w- */
#define __P011	PAGE_COPY		/* private -wr */
#define __P100	PAGE_READONLY_EXEC	/* private x-- */
#define __P101	PAGE_READONLY_EXEC	/* private x-r */
#define __P110	PAGE_COPY_EXEC		/* private xw- */
#define __P111	PAGE_COPY_EXEC		/* private xwr */

#define __S000	PAGE_NONE		/* shared  --- */
#define __S001	PAGE_READONLY		/* shared  --r */
#define __S010	PAGE_SHARED		/* shared  -w- */
#define __S011	PAGE_SHARED		/* shared  -wr */
#define __S100	PAGE_READONLY_EXEC	/* shared  x-- */
#define __S101	PAGE_READONLY_EXEC	/* shared  x-r */
#define __S110	PAGE_SHARED_EXEC	/* shared  xw- */
#define __S111	PAGE_SHARED_EXEC	/* shared  xwr */

#ifndef __ASSEMBLY__

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

extern unsigned long empty_zero_page[1024];

#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))

extern pgd_t swapper_pg_dir[PAGE_SIZE/sizeof(pgd_t)];

/*
 * The pmd contains the kernel virtual address of the pte page.
 */
#define pmd_page_vaddr(pmd) ((unsigned long)(pmd_val(pmd) & PAGE_MASK))
#define pmd_page(pmd) virt_to_page(pmd_val(pmd))

/*
 * pte status.
 */
#define pte_none(pte)	 (pte_val(pte) == _PAGE_INVALID)
#define pte_present(pte)						\
	(((pte_val(pte) & _PAGE_CA_MASK) != _PAGE_INVALID)		\
	 || ((pte_val(pte) & _PAGE_PROTNONE) == _PAGE_PROTNONE))
#define pte_clear(mm,addr,ptep)						\
	do { update_pte(ptep, __pte(_PAGE_INVALID)); } while(0)

#define pmd_none(pmd)	 (!pmd_val(pmd))
#define pmd_present(pmd) (pmd_val(pmd) & PAGE_MASK)
#define pmd_bad(pmd)	 (pmd_val(pmd) & ~PAGE_MASK)
#define pmd_clear(pmdp)	 do { set_pmd(pmdp, __pmd(0)); } while (0)

static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITABLE; }
static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
static inline int pte_file(pte_t pte)  { return pte_val(pte) & _PAGE_FILE; }
static inline pte_t pte_wrprotect(pte_t pte)	
	{ pte_val(pte) &= ~(_PAGE_WRITABLE | _PAGE_HW_WRITE); return pte; }
static inline pte_t pte_mkclean(pte_t pte)
	{ pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_HW_WRITE); return pte; }
static inline pte_t pte_mkold(pte_t pte)
	{ pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
static inline pte_t pte_mkdirty(pte_t pte)
	{ pte_val(pte) |= _PAGE_DIRTY; return pte; }
static inline pte_t pte_mkyoung(pte_t pte)
	{ pte_val(pte) |= _PAGE_ACCESSED; return pte; }
static inline pte_t pte_mkwrite(pte_t pte)
	{ pte_val(pte) |= _PAGE_WRITABLE; return pte; }

/*
 * Conversion functions: convert a page and protection to a page entry,
 * and a page entry and page directory to the page they refer to.
 */

#define pte_pfn(pte)		(pte_val(pte) >> PAGE_SHIFT)
#define pte_same(a,b)		(pte_val(a) == pte_val(b))
#define pte_page(x)		pfn_to_page(pte_pfn(x))
#define pfn_pte(pfn, prot)	__pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
#define mk_pte(page, prot)	pfn_pte(page_to_pfn(page), prot)

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

/*
 * Certain architectures need to do special things when pte's
 * within a page table are directly modified.  Thus, the following
 * hook is made available.
 */
static inline void update_pte(pte_t *ptep, pte_t pteval)
{
	*ptep = pteval;
#if (DCACHE_WAY_SIZE > PAGE_SIZE) && XCHAL_DCACHE_IS_WRITEBACK
	__asm__ __volatile__ ("dhwb %0, 0" :: "a" (ptep));
#endif

}

struct mm_struct;

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


static inline void
set_pmd(pmd_t *pmdp, pmd_t pmdval)
{
	*pmdp = pmdval;
}

struct vm_area_struct;

static inline int
ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr,
    			  pte_t *ptep)
{
	pte_t pte = *ptep;
	if (!pte_young(pte))
		return 0;
	update_pte(ptep, pte_mkold(pte));
	return 1;
}

static inline pte_t
ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
	pte_t pte = *ptep;
	pte_clear(mm, addr, ptep);
	return pte;
}

static inline void
ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
  	pte_t pte = *ptep;
  	update_pte(ptep, pte_wrprotect(pte));
}

/* to find an entry in a kernel page-table-directory */
#define pgd_offset_k(address)	pgd_offset(&init_mm, address)

/* to find an entry in a page-table-directory */
#define pgd_offset(mm,address)	((mm)->pgd + pgd_index(address))

#define pgd_index(address)	((address) >> PGDIR_SHIFT)

/* Find an entry in the second-level page table.. */
#define pmd_offset(dir,address) ((pmd_t*)(dir))

/* Find an entry in the third-level page table.. */
#define pte_index(address)	(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
#define pte_offset_kernel(dir,addr) 					\
	((pte_t*) pmd_page_vaddr(*(dir)) + pte_index(addr))
#define pte_offset_map(dir,addr)	pte_offset_kernel((dir),(addr))
#define pte_offset_map_nested(dir,addr)	pte_offset_kernel((dir),(addr))

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


/*
 * Encode and decode a swap entry.
 *
 * Format of swap pte:
 *  bit	   0	   MBZ
 *  bit	   1	   page-file (must be zero)
 *  bits   2 -  3  page hw access mode (must be 11: _PAGE_INVALID)
 *  bits   4 -  5  ring protection (must be 01: _PAGE_USER)
 *  bits   6 - 10  swap type (5 bits -> 32 types)
 *  bits  11 - 31  swap offset / PAGE_SIZE (21 bits -> 8GB)
 
 * Format of file pte:
 *  bit	   0	   MBZ
 *  bit	   1	   page-file (must be one: _PAGE_FILE)
 *  bits   2 -  3  page hw access mode (must be 11: _PAGE_INVALID)
 *  bits   4 -  5  ring protection (must be 01: _PAGE_USER)
 *  bits   6 - 31  file offset / PAGE_SIZE
 */

#define __swp_type(entry)	(((entry).val >> 6) & 0x1f)
#define __swp_offset(entry)	((entry).val >> 11)
#define __swp_entry(type,offs)	\
	((swp_entry_t) {((type) << 6) | ((offs) << 11) | _PAGE_INVALID})
#define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x)	((pte_t) { (x).val })

#define PTE_FILE_MAX_BITS	28
#define pte_to_pgoff(pte)	(pte_val(pte) >> 4)
#define pgoff_to_pte(off)	\
	((pte_t) { ((off) << 4) | _PAGE_INVALID | _PAGE_FILE })

#endif /*  !defined (__ASSEMBLY__) */


#ifdef __ASSEMBLY__

/* Assembly macro _PGD_INDEX is the same as C pgd_index(unsigned long),
 *                _PGD_OFFSET as C pgd_offset(struct mm_struct*, unsigned long),
 *                _PMD_OFFSET as C pmd_offset(pgd_t*, unsigned long)
 *                _PTE_OFFSET as C pte_offset(pmd_t*, unsigned long)
 *
 * Note: We require an additional temporary register which can be the same as
 *       the register that holds the address.
 *
 * ((pte_t*) ((unsigned long)(pmd_val(*pmd) & PAGE_MASK)) + pte_index(addr))
 *
 */
#define _PGD_INDEX(rt,rs)	extui	rt, rs, PGDIR_SHIFT, 32-PGDIR_SHIFT
#define _PTE_INDEX(rt,rs)	extui	rt, rs, PAGE_SHIFT, PTRS_PER_PTE_SHIFT

#define _PGD_OFFSET(mm,adr,tmp)		l32i	mm, mm, MM_PGD;		\
					_PGD_INDEX(tmp, adr);		\
					addx4	mm, tmp, mm

#define _PTE_OFFSET(pmd,adr,tmp)	_PTE_INDEX(tmp, adr);		\
					srli	pmd, pmd, PAGE_SHIFT;	\
					slli	pmd, pmd, PAGE_SHIFT;	\
					addx4	pmd, tmp, pmd

#else

extern void paging_init(void);

#define kern_addr_valid(addr)	(1)

extern  void update_mmu_cache(struct vm_area_struct * vma,
			      unsigned long address, pte_t pte);

/*
 * remap a physical page `pfn' of size `size' with page protection `prot'
 * into virtual address `from'
 */

#define io_remap_pfn_range(vma,from,pfn,size,prot) \
                remap_pfn_range(vma, from, pfn, size, prot)


extern void pgtable_cache_init(void);

typedef pte_t *pte_addr_t;

#endif /* !defined (__ASSEMBLY__) */

#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
#define __HAVE_ARCH_PTEP_SET_WRPROTECT
#define __HAVE_ARCH_PTEP_MKDIRTY
#define __HAVE_ARCH_PTE_SAME

#include <asm-generic/pgtable.h>

#endif /* _XTENSA_PGTABLE_H */
Commit	Line	Data
9a8fd558	1	/*
6656920b	2	* include/asm-xtensa/pgtable.h
9a8fd558 CZ	3	*
9a8fd558 CZ	4	* This program is free software; you can redistribute it and/or modify
01858d1b	5	* it under the terms of the GNU General Public License version 2 as
9a8fd558 CZ	6	* published by the Free Software Foundation.
9a8fd558 CZ	7	*
01858d1b	8	* Copyright (C) 2001 - 2007 Tensilica Inc.
9a8fd558 CZ	9	*/
	10
	11	#ifndef _XTENSA_PGTABLE_H
	12	#define _XTENSA_PGTABLE_H
	13
	14	#include <asm-generic/pgtable-nopmd.h>
	15	#include <asm/page.h>
	16
9a8fd558 CZ	17	/*
	18	* We only use two ring levels, user and kernel space.
	19	*/
	20
	21	#define USER_RING 1 /* user ring level */
	22	#define KERNEL_RING 0 /* kernel ring level */
	23
	24	/*
	25	* The Xtensa architecture port of Linux has a two-level page table system,
01858d1b	26	* i.e. the logical three-level Linux page table layout is folded.
9a8fd558 CZ	27	* Each task has the following memory page tables:
	28	*
	29	* PGD table (page directory), ie. 3rd-level page table:
	30	* One page (4 kB) of 1024 (PTRS_PER_PGD) pointers to PTE tables
	31	* (Architectures that don't have the PMD folded point to the PMD tables)
	32	*
	33	* The pointer to the PGD table for a given task can be retrieved from
	34	* the task structure (struct task_struct*) t, e.g. current():
	35	* (t->mm ? t->mm : t->active_mm)->pgd
	36	*
	37	* PMD tables (page middle-directory), ie. 2nd-level page tables:
	38	* Absent for the Xtensa architecture (folded, PTRS_PER_PMD == 1).
	39	*
	40	* PTE tables (page table entry), ie. 1st-level page tables:
	41	* One page (4 kB) of 1024 (PTRS_PER_PTE) PTEs with a special PTE
	42	* invalid_pte_table for absent mappings.
	43	*
	44	* The individual pages are 4 kB big with special pages for the empty_zero_page.
	45	*/
01858d1b	46
9a8fd558 CZ	47	#define PGDIR_SHIFT 22
	48	#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
	49	#define PGDIR_MASK (~(PGDIR_SIZE-1))
	50
	51	/*
	52	* Entries per page directory level: we use two-level, so
	53	* we don't really have any PMD directory physically.
	54	*/
	55	#define PTRS_PER_PTE 1024
	56	#define PTRS_PER_PTE_SHIFT 10
9a8fd558 CZ	57	#define PTRS_PER_PGD 1024
9a8fd558 CZ	58	#define PGD_ORDER 0
9a8fd558	59	#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
01858d1b	60	#define FIRST_USER_ADDRESS 0
9a8fd558 CZ	61	#define FIRST_USER_PGD_NR (FIRST_USER_ADDRESS >> PGDIR_SHIFT)
9a8fd558 CZ	62
6656920b CZ	63	/*
6656920b CZ	64	* Virtual memory area. We keep a distance to other memory regions to be
9a8fd558 CZ	65	* on the safe side. We also use this area for cache aliasing.
	66	*/
	67
9a8fd558	68	#define VMALLOC_START 0xC0000000
6656920b CZ	69	#define VMALLOC_END 0xC6FEFFFF
	70	#define TLBTEMP_BASE_1 0xC6FF0000
	71	#define TLBTEMP_BASE_2 0xC6FF8000
	72	#define MODULE_START 0xC7000000
	73	#define MODULE_END 0xC7FFFFFF
9a8fd558	74
6656920b CZ	75	/*
6656920b CZ	76	* Xtensa Linux config PTE layout (when present):
9a8fd558 CZ	77	* 31-12: PPN
	78	* 11-6: Software
	79	* 5-4: RING
	80	* 3-0: CA
	81	*
	82	* Similar to the Alpha and MIPS ports, we need to keep track of the ref
	83	* and mod bits in software. We have a software "you can read
	84	* from this page" bit, and a hardware one which actually lets the
	85	* process read from the page. On the same token we have a software
	86	* writable bit and the real hardware one which actually lets the
	87	* process write to the page.
	88	*
	89	* See further below for PTE layout for swapped-out pages.
	90	*/
	91
01858d1b CZ	92	#define _PAGE_HW_EXEC (1<<0) /* hardware: page is executable */
	93	#define _PAGE_HW_WRITE (1<<1) /* hardware: page is writable */
	94
	95	#define _PAGE_FILE (1<<1) /* non-linear mapping, if !present */
	96	#define _PAGE_PROTNONE (3<<0) /* special case for VM_PROT_NONE */
9a8fd558 CZ	97
9a8fd558 CZ	98	/* None of these cache modes include MP coherency: */
01858d1b CZ	99	#define _PAGE_CA_BYPASS (0<<2) /* bypass, non-speculative */
	100	#define _PAGE_CA_WB (1<<2) /* write-back */
	101	#define _PAGE_CA_WT (2<<2) /* write-through */
	102	#define _PAGE_CA_MASK (3<<2)
	103	#define _PAGE_INVALID (3<<2)
9a8fd558 CZ	104
9a8fd558 CZ	105	#define _PAGE_USER (1<<4) /* user access (ring=1) */
9a8fd558 CZ	106
9a8fd558 CZ	107	/* Software */
01858d1b CZ	108	#define _PAGE_WRITABLE_BIT 6
01858d1b CZ	109	#define _PAGE_WRITABLE (1<<6) /* software: page writable */
9a8fd558 CZ	110	#define _PAGE_DIRTY (1<<7) /* software: page dirty */
9a8fd558 CZ	111	#define _PAGE_ACCESSED (1<<8) /* software: page accessed (read) */
9a8fd558	112
01858d1b CZ	113	/* On older HW revisions, we always have to set bit 0 */
	114	#if XCHAL_HW_VERSION_MAJOR < 2000
	115	# define _PAGE_VALID (1<<0)
	116	#else
	117	# define _PAGE_VALID 0
	118	#endif
	119
	120	#define _PAGE_CHG_MASK (PAGE_MASK \| _PAGE_ACCESSED \| _PAGE_DIRTY)
	121	#define _PAGE_PRESENT (_PAGE_VALID \| _PAGE_CA_WB \| _PAGE_ACCESSED)
9a8fd558 CZ	122
	123	#ifdef CONFIG_MMU
	124
01858d1b CZ	125	#define PAGE_NONE __pgprot(_PAGE_INVALID \| _PAGE_USER \| _PAGE_PROTNONE)
	126	#define PAGE_COPY __pgprot(_PAGE_PRESENT \| _PAGE_USER)
	127	#define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT \| _PAGE_USER \| _PAGE_HW_EXEC)
	128	#define PAGE_READONLY __pgprot(_PAGE_PRESENT \| _PAGE_USER)
	129	#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT \| _PAGE_USER \| _PAGE_HW_EXEC)
	130	#define PAGE_SHARED __pgprot(_PAGE_PRESENT \| _PAGE_USER \| _PAGE_WRITABLE)
	131	#define PAGE_SHARED_EXEC \
	132	__pgprot(_PAGE_PRESENT \| _PAGE_USER \| _PAGE_WRITABLE \| _PAGE_HW_EXEC)
6656920b CZ	133	#define PAGE_KERNEL __pgprot(_PAGE_PRESENT \| _PAGE_HW_WRITE)
6656920b CZ	134	#define PAGE_KERNEL_EXEC __pgprot(_PAGE_PRESENT\|_PAGE_HW_WRITE\|_PAGE_HW_EXEC)
01858d1b CZ	135
01858d1b CZ	136	#if (DCACHE_WAY_SIZE > PAGE_SIZE)
6656920b	137	# define _PAGE_DIRECTORY (_PAGE_VALID \| _PAGE_ACCESSED)
01858d1b	138	#else
6656920b	139	# define _PAGE_DIRECTORY (_PAGE_VALID \| _PAGE_ACCESSED \| _PAGE_CA_WB)
01858d1b	140	#endif
9a8fd558 CZ	141
	142	#else /* no mmu */
	143
	144	# define PAGE_NONE __pgprot(0)
	145	# define PAGE_SHARED __pgprot(0)
	146	# define PAGE_COPY __pgprot(0)
	147	# define PAGE_READONLY __pgprot(0)
	148	# define PAGE_KERNEL __pgprot(0)
	149
	150	#endif
	151
	152	/*
	153	* On certain configurations of Xtensa MMUs (eg. the initial Linux config),
	154	* the MMU can't do page protection for execute, and considers that the same as
	155	* read. Also, write permissions may imply read permissions.
	156	* What follows is the closest we can get by reasonable means..
	157	* See linux/mm/mmap.c for protection_map[] array that uses these definitions.
	158	*/
01858d1b CZ	159	#define __P000 PAGE_NONE /* private --- */
	160	#define __P001 PAGE_READONLY /* private --r */
	161	#define __P010 PAGE_COPY /* private -w- */
	162	#define __P011 PAGE_COPY /* private -wr */
	163	#define __P100 PAGE_READONLY_EXEC /* private x-- */
	164	#define __P101 PAGE_READONLY_EXEC /* private x-r */
	165	#define __P110 PAGE_COPY_EXEC /* private xw- */
	166	#define __P111 PAGE_COPY_EXEC /* private xwr */
	167
	168	#define __S000 PAGE_NONE /* shared --- */
	169	#define __S001 PAGE_READONLY /* shared --r */
	170	#define __S010 PAGE_SHARED /* shared -w- */
	171	#define __S011 PAGE_SHARED /* shared -wr */
	172	#define __S100 PAGE_READONLY_EXEC /* shared x-- */
	173	#define __S101 PAGE_READONLY_EXEC /* shared x-r */
	174	#define __S110 PAGE_SHARED_EXEC /* shared xw- */
	175	#define __S111 PAGE_SHARED_EXEC /* shared xwr */
9a8fd558 CZ	176
	177	#ifndef __ASSEMBLY__
	178
	179	#define pte_ERROR(e) \
	180	printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
	181	#define pgd_ERROR(e) \
	182	printk("%s:%d: bad pgd entry %08lx.\n", __FILE__, __LINE__, pgd_val(e))
	183
	184	extern unsigned long empty_zero_page[1024];
	185
	186	#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
	187
	188	extern pgd_t swapper_pg_dir[PAGE_SIZE/sizeof(pgd_t)];
	189
	190	/*
	191	* The pmd contains the kernel virtual address of the pte page.
	192	*/
46a82b2d	193	#define pmd_page_vaddr(pmd) ((unsigned long)(pmd_val(pmd) & PAGE_MASK))
9a8fd558 CZ	194	#define pmd_page(pmd) virt_to_page(pmd_val(pmd))
	195
	196	/*
01858d1b	197	* pte status.
9a8fd558	198	*/
01858d1b CZ	199	#define pte_none(pte) (pte_val(pte) == _PAGE_INVALID)
	200	#define pte_present(pte) \
	201	(((pte_val(pte) & _PAGE_CA_MASK) != _PAGE_INVALID) \
	202	\|\| ((pte_val(pte) & _PAGE_PROTNONE) == _PAGE_PROTNONE))
9a8fd558	203	#define pte_clear(mm,addr,ptep) \
01858d1b	204	do { update_pte(ptep, __pte(_PAGE_INVALID)); } while(0)
9a8fd558 CZ	205
	206	#define pmd_none(pmd) (!pmd_val(pmd))
	207	#define pmd_present(pmd) (pmd_val(pmd) & PAGE_MASK)
9a8fd558	208	#define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK)
01858d1b	209	#define pmd_clear(pmdp) do { set_pmd(pmdp, __pmd(0)); } while (0)
9a8fd558	210
01858d1b	211	static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITABLE; }
9a8fd558 CZ	212	static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
	213	static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
	214	static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
01858d1b CZ	215	static inline pte_t pte_wrprotect(pte_t pte)
	216	{ pte_val(pte) &= ~(_PAGE_WRITABLE \| _PAGE_HW_WRITE); return pte; }
	217	static inline pte_t pte_mkclean(pte_t pte)
	218	{ pte_val(pte) &= ~(_PAGE_DIRTY \| _PAGE_HW_WRITE); return pte; }
	219	static inline pte_t pte_mkold(pte_t pte)
	220	{ pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
	221	static inline pte_t pte_mkdirty(pte_t pte)
	222	{ pte_val(pte) \|= _PAGE_DIRTY; return pte; }
	223	static inline pte_t pte_mkyoung(pte_t pte)
	224	{ pte_val(pte) \|= _PAGE_ACCESSED; return pte; }
	225	static inline pte_t pte_mkwrite(pte_t pte)
	226	{ pte_val(pte) \|= _PAGE_WRITABLE; return pte; }
9a8fd558 CZ	227
	228	/*
	229	* Conversion functions: convert a page and protection to a page entry,
	230	* and a page entry and page directory to the page they refer to.
	231	*/
01858d1b	232
9a8fd558 CZ	233	#define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT)
	234	#define pte_same(a,b) (pte_val(a) == pte_val(b))
	235	#define pte_page(x) pfn_to_page(pte_pfn(x))
	236	#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) \| pgprot_val(prot))
	237	#define mk_pte(page, prot) pfn_pte(page_to_pfn(page), prot)
	238
d99cf715	239	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
9a8fd558 CZ	240	{
	241	return __pte((pte_val(pte) & _PAGE_CHG_MASK) \| pgprot_val(newprot));
	242	}
	243
	244	/*
	245	* Certain architectures need to do special things when pte's
	246	* within a page table are directly modified. Thus, the following
	247	* hook is made available.
	248	*/
	249	static inline void update_pte(pte_t *ptep, pte_t pteval)
	250	{
	251	*ptep = pteval;
6656920b CZ	252	#if (DCACHE_WAY_SIZE > PAGE_SIZE) && XCHAL_DCACHE_IS_WRITEBACK
	253	__asm__ __volatile__ ("dhwb %0, 0" :: "a" (ptep));
	254	#endif
	255
9a8fd558 CZ	256	}
9a8fd558 CZ	257
8c65b4a6 TS	258	struct mm_struct;
8c65b4a6 TS	259
d99cf715	260	static inline void
9a8fd558 CZ	261	set_pte_at(struct mm_struct mm, unsigned long addr, pte_t ptep, pte_t pteval)
	262	{
	263	update_pte(ptep, pteval);
	264	}
	265
	266
d99cf715	267	static inline void
9a8fd558 CZ	268	set_pmd(pmd_t *pmdp, pmd_t pmdval)
	269	{
	270	*pmdp = pmdval;
9a8fd558 CZ	271	}
9a8fd558 CZ	272
8c65b4a6	273	struct vm_area_struct;
9a8fd558 CZ	274
	275	static inline int
	276	ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr,
	277	pte_t *ptep)
	278	{
	279	pte_t pte = *ptep;
	280	if (!pte_young(pte))
	281	return 0;
	282	update_pte(ptep, pte_mkold(pte));
	283	return 1;
	284	}
	285
9a8fd558 CZ	286	static inline pte_t
	287	ptep_get_and_clear(struct mm_struct mm, unsigned long addr, pte_t ptep)
	288	{
	289	pte_t pte = *ptep;
	290	pte_clear(mm, addr, ptep);
	291	return pte;
	292	}
	293
	294	static inline void
	295	ptep_set_wrprotect(struct mm_struct mm, unsigned long addr, pte_t ptep)
	296	{
	297	pte_t pte = *ptep;
	298	update_pte(ptep, pte_wrprotect(pte));
	299	}
	300
	301	/* to find an entry in a kernel page-table-directory */
	302	#define pgd_offset_k(address) pgd_offset(&init_mm, address)
	303
	304	/* to find an entry in a page-table-directory */
	305	#define pgd_offset(mm,address) ((mm)->pgd + pgd_index(address))
	306
	307	#define pgd_index(address) ((address) >> PGDIR_SHIFT)
	308
	309	/* Find an entry in the second-level page table.. */
	310	#define pmd_offset(dir,address) ((pmd_t*)(dir))
	311
	312	/* Find an entry in the third-level page table.. */
	313	#define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
	314	#define pte_offset_kernel(dir,addr) \
46a82b2d	315	((pte_t) pmd_page_vaddr((dir)) + pte_index(addr))
9a8fd558 CZ	316	#define pte_offset_map(dir,addr) pte_offset_kernel((dir),(addr))
	317	#define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir),(addr))
	318
	319	#define pte_unmap(pte) do { } while (0)
	320	#define pte_unmap_nested(pte) do { } while (0)
	321
	322
	323	/*
	324	* Encode and decode a swap entry.
9a8fd558	325	*
01858d1b CZ	326	* Format of swap pte:
	327	* bit 0 MBZ
	328	* bit 1 page-file (must be zero)
	329	* bits 2 - 3 page hw access mode (must be 11: _PAGE_INVALID)
	330	* bits 4 - 5 ring protection (must be 01: _PAGE_USER)
	331	* bits 6 - 10 swap type (5 bits -> 32 types)
	332	* bits 11 - 31 swap offset / PAGE_SIZE (21 bits -> 8GB)
	333
	334	* Format of file pte:
	335	* bit 0 MBZ
	336	* bit 1 page-file (must be one: _PAGE_FILE)
	337	* bits 2 - 3 page hw access mode (must be 11: _PAGE_INVALID)
	338	* bits 4 - 5 ring protection (must be 01: _PAGE_USER)
	339	* bits 6 - 31 file offset / PAGE_SIZE
9a8fd558 CZ	340	*/
9a8fd558 CZ	341
01858d1b CZ	342	#define __swp_type(entry) (((entry).val >> 6) & 0x1f)
	343	#define __swp_offset(entry) ((entry).val >> 11)
	344	#define __swp_entry(type,offs) \
	345	((swp_entry_t) {((type) << 6) \| ((offs) << 11) \| _PAGE_INVALID})
9a8fd558 CZ	346	#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
	347	#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
	348
01858d1b CZ	349	#define PTE_FILE_MAX_BITS 28
	350	#define pte_to_pgoff(pte) (pte_val(pte) >> 4)
	351	#define pgoff_to_pte(off) \
	352	((pte_t) { ((off) << 4) \| _PAGE_INVALID \| _PAGE_FILE })
9a8fd558 CZ	353
	354	#endif /* !defined (__ASSEMBLY__) */
	355
	356
	357	#ifdef __ASSEMBLY__
	358
	359	/* Assembly macro _PGD_INDEX is the same as C pgd_index(unsigned long),
	360	* _PGD_OFFSET as C pgd_offset(struct mm_struct*, unsigned long),
	361	* _PMD_OFFSET as C pmd_offset(pgd_t*, unsigned long)
	362	* _PTE_OFFSET as C pte_offset(pmd_t*, unsigned long)
	363	*
	364	* Note: We require an additional temporary register which can be the same as
	365	* the register that holds the address.
	366	*
	367	* ((pte_t) ((unsigned long)(pmd_val(pmd) & PAGE_MASK)) + pte_index(addr))
	368	*
	369	*/
	370	#define _PGD_INDEX(rt,rs) extui rt, rs, PGDIR_SHIFT, 32-PGDIR_SHIFT
	371	#define _PTE_INDEX(rt,rs) extui rt, rs, PAGE_SHIFT, PTRS_PER_PTE_SHIFT
	372
	373	#define _PGD_OFFSET(mm,adr,tmp) l32i mm, mm, MM_PGD; \
	374	_PGD_INDEX(tmp, adr); \
	375	addx4 mm, tmp, mm
	376
	377	#define _PTE_OFFSET(pmd,adr,tmp) _PTE_INDEX(tmp, adr); \
	378	srli pmd, pmd, PAGE_SHIFT; \
	379	slli pmd, pmd, PAGE_SHIFT; \
	380	addx4 pmd, tmp, pmd
	381
	382	#else
	383
	384	extern void paging_init(void);
	385
	386	#define kern_addr_valid(addr) (1)
	387
	388	extern void update_mmu_cache(struct vm_area_struct * vma,
	389	unsigned long address, pte_t pte);
	390
	391	/*
33bf5610	392	* remap a physical page `pfn' of size `size' with page protection `prot'
9a8fd558 CZ	393	* into virtual address `from'
9a8fd558 CZ	394	*/
6656920b	395
33bf5610 RD	396	#define io_remap_pfn_range(vma,from,pfn,size,prot) \
33bf5610 RD	397	remap_pfn_range(vma, from, pfn, size, prot)
9a8fd558 CZ	398
9a8fd558 CZ	399
6656920b	400	extern void pgtable_cache_init(void);
9a8fd558 CZ	401
	402	typedef pte_t *pte_addr_t;
	403
	404	#endif /* !defined (__ASSEMBLY__) */
	405
	406	#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
9a8fd558 CZ	407	#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
	408	#define __HAVE_ARCH_PTEP_SET_WRPROTECT
	409	#define __HAVE_ARCH_PTEP_MKDIRTY
	410	#define __HAVE_ARCH_PTE_SAME
	411
	412	#include <asm-generic/pgtable.h>
	413
	414	#endif /* _XTENSA_PGTABLE_H */