[net-next-2.6.git] / arch / mn10300 / include / asm / pgtable.h

/* MN10300 Page table manipulators and constants
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 *
 *
 * The Linux memory management assumes a three-level page table setup. On
 * the i386, we use that, but "fold" the mid level into the top-level page
 * table, so that we physically have the same two-level page table as the
 * i386 mmu expects.
 *
 * This file contains the functions and defines necessary to modify and use
 * the i386 page table tree for the purposes of the MN10300 TLB handler
 * functions.
 */
#ifndef _ASM_PGTABLE_H
#define _ASM_PGTABLE_H

#include <asm/cpu-regs.h>

#ifndef __ASSEMBLY__
#include <asm/processor.h>
#include <asm/cache.h>
#include <linux/threads.h>

#include <asm/bitops.h>

#include <linux/slab.h>
#include <linux/list.h>
#include <linux/spinlock.h>

/*
 * ZERO_PAGE is a global shared page that is always zero: used
 * for zero-mapped memory areas etc..
 */
#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
extern unsigned long empty_zero_page[1024];
extern spinlock_t pgd_lock;
extern struct page *pgd_list;

extern void pmd_ctor(void *, struct kmem_cache *, unsigned long);
extern void pgtable_cache_init(void);
extern void paging_init(void);

#endif /* !__ASSEMBLY__ */

/*
 * The Linux mn10300 paging architecture only implements both the traditional
 * 2-level page tables
 */
#define PGDIR_SHIFT	22
#define PTRS_PER_PGD	1024
#define PTRS_PER_PUD	1	/* we don't really have any PUD physically */
#define PTRS_PER_PMD	1	/* we don't really have any PMD physically */
#define PTRS_PER_PTE	1024

#define PGD_SIZE	PAGE_SIZE
#define PMD_SIZE	(1UL << PMD_SHIFT)
#define PGDIR_SIZE	(1UL << PGDIR_SHIFT)
#define PGDIR_MASK	(~(PGDIR_SIZE - 1))

#define USER_PTRS_PER_PGD	(TASK_SIZE / PGDIR_SIZE)
#define FIRST_USER_ADDRESS	0

#define USER_PGD_PTRS		(PAGE_OFFSET >> PGDIR_SHIFT)
#define KERNEL_PGD_PTRS		(PTRS_PER_PGD - USER_PGD_PTRS)

#define TWOLEVEL_PGDIR_SHIFT	22
#define BOOT_USER_PGD_PTRS	(__PAGE_OFFSET >> TWOLEVEL_PGDIR_SHIFT)
#define BOOT_KERNEL_PGD_PTRS	(1024 - BOOT_USER_PGD_PTRS)

#ifndef __ASSEMBLY__
extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
#endif

/*
 * Unfortunately, due to the way the MMU works on the MN10300, the vmalloc VM
 * area has to be in the lower half of the virtual address range (the upper
 * half is not translated through the TLB).
 *
 * So in this case, the vmalloc area goes at the bottom of the address map
 * (leaving a hole at the very bottom to catch addressing errors), and
 * userspace starts immediately above.
 *
 * The vmalloc() routines also leaves a hole of 4kB between each vmalloced
 * area to catch addressing errors.
 */
#define VMALLOC_OFFSET	(8 * 1024 * 1024)
#define VMALLOC_START	(0x70000000)
#define VMALLOC_END	(0x7C000000)

#ifndef __ASSEMBLY__
extern pte_t kernel_vmalloc_ptes[(VMALLOC_END - VMALLOC_START) / PAGE_SIZE];
#endif

/* IPTEL/DPTEL bit assignments */
#define _PAGE_BIT_VALID		xPTEL_V_BIT
#define _PAGE_BIT_ACCESSED	xPTEL_UNUSED1_BIT	/* mustn't be loaded into IPTEL/DPTEL */
#define _PAGE_BIT_NX		xPTEL_UNUSED2_BIT	/* mustn't be loaded into IPTEL/DPTEL */
#define _PAGE_BIT_CACHE		xPTEL_C_BIT
#define _PAGE_BIT_PRESENT	xPTEL_PV_BIT
#define _PAGE_BIT_DIRTY		xPTEL_D_BIT
#define _PAGE_BIT_GLOBAL	xPTEL_G_BIT

#define _PAGE_VALID		xPTEL_V
#define _PAGE_ACCESSED		xPTEL_UNUSED1
#define _PAGE_NX		xPTEL_UNUSED2		/* no-execute bit */
#define _PAGE_CACHE		xPTEL_C
#define _PAGE_PRESENT		xPTEL_PV
#define _PAGE_DIRTY		xPTEL_D
#define _PAGE_PROT		xPTEL_PR
#define _PAGE_PROT_RKNU		xPTEL_PR_ROK
#define _PAGE_PROT_WKNU		xPTEL_PR_RWK
#define _PAGE_PROT_RKRU		xPTEL_PR_ROK_ROU
#define _PAGE_PROT_WKRU		xPTEL_PR_RWK_ROU
#define _PAGE_PROT_WKWU		xPTEL_PR_RWK_RWU
#define _PAGE_GLOBAL		xPTEL_G
#define _PAGE_PSE		xPTEL_PS_4Mb		/* 4MB page */

#define _PAGE_FILE		xPTEL_UNUSED1_BIT	/* set:pagecache unset:swap */

#define __PAGE_PROT_UWAUX	0x040
#define __PAGE_PROT_USER	0x080
#define __PAGE_PROT_WRITE	0x100

#define _PAGE_PRESENTV		(_PAGE_PRESENT|_PAGE_VALID)
#define _PAGE_PROTNONE		0x000	/* If not present */

#ifndef __ASSEMBLY__

#define VMALLOC_VMADDR(x) ((unsigned long)(x))

#define _PAGE_TABLE	(_PAGE_PRESENTV | _PAGE_PROT_WKNU | _PAGE_ACCESSED | _PAGE_DIRTY)
#define _PAGE_CHG_MASK	(PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)

#define __PAGE_NONE	(_PAGE_PRESENTV | _PAGE_PROT_RKNU | _PAGE_ACCESSED | _PAGE_CACHE)
#define __PAGE_SHARED	(_PAGE_PRESENTV | _PAGE_PROT_WKWU | _PAGE_ACCESSED | _PAGE_CACHE)
#define __PAGE_COPY	(_PAGE_PRESENTV | _PAGE_PROT_RKRU | _PAGE_ACCESSED | _PAGE_CACHE)
#define __PAGE_READONLY	(_PAGE_PRESENTV | _PAGE_PROT_RKRU | _PAGE_ACCESSED | _PAGE_CACHE)

#define PAGE_NONE		__pgprot(__PAGE_NONE     | _PAGE_NX)
#define PAGE_SHARED_NOEXEC	__pgprot(__PAGE_SHARED   | _PAGE_NX)
#define PAGE_COPY_NOEXEC	__pgprot(__PAGE_COPY     | _PAGE_NX)
#define PAGE_READONLY_NOEXEC	__pgprot(__PAGE_READONLY | _PAGE_NX)
#define PAGE_SHARED_EXEC	__pgprot(__PAGE_SHARED)
#define PAGE_COPY_EXEC		__pgprot(__PAGE_COPY)
#define PAGE_READONLY_EXEC	__pgprot(__PAGE_READONLY)
#define PAGE_COPY		PAGE_COPY_NOEXEC
#define PAGE_READONLY		PAGE_READONLY_NOEXEC
#define PAGE_SHARED		PAGE_SHARED_EXEC

#define __PAGE_KERNEL_BASE (_PAGE_PRESENTV | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)

#define __PAGE_KERNEL		(__PAGE_KERNEL_BASE | _PAGE_PROT_WKNU | _PAGE_CACHE | _PAGE_NX)
#define __PAGE_KERNEL_NOCACHE	(__PAGE_KERNEL_BASE | _PAGE_PROT_WKNU | _PAGE_NX)
#define __PAGE_KERNEL_EXEC	(__PAGE_KERNEL & ~_PAGE_NX)
#define __PAGE_KERNEL_RO	(__PAGE_KERNEL_BASE | _PAGE_PROT_RKNU | _PAGE_CACHE | _PAGE_NX)
#define __PAGE_KERNEL_LARGE	(__PAGE_KERNEL | _PAGE_PSE)
#define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC | _PAGE_PSE)

#define PAGE_KERNEL		__pgprot(__PAGE_KERNEL)
#define PAGE_KERNEL_RO		__pgprot(__PAGE_KERNEL_RO)
#define PAGE_KERNEL_EXEC	__pgprot(__PAGE_KERNEL_EXEC)
#define PAGE_KERNEL_NOCACHE	__pgprot(__PAGE_KERNEL_NOCACHE)
#define PAGE_KERNEL_LARGE	__pgprot(__PAGE_KERNEL_LARGE)
#define PAGE_KERNEL_LARGE_EXEC	__pgprot(__PAGE_KERNEL_LARGE_EXEC)

/*
 * Whilst the MN10300 can do page protection for execute (given separate data
 * and insn TLBs), we are not supporting it at the moment. Write permission,
 * however, always implies read permission (but not execute permission).
 */
#define __P000	PAGE_NONE
#define __P001	PAGE_READONLY_NOEXEC
#define __P010	PAGE_COPY_NOEXEC
#define __P011	PAGE_COPY_NOEXEC
#define __P100	PAGE_READONLY_EXEC
#define __P101	PAGE_READONLY_EXEC
#define __P110	PAGE_COPY_EXEC
#define __P111	PAGE_COPY_EXEC

#define __S000	PAGE_NONE
#define __S001	PAGE_READONLY_NOEXEC
#define __S010	PAGE_SHARED_NOEXEC
#define __S011	PAGE_SHARED_NOEXEC
#define __S100	PAGE_READONLY_EXEC
#define __S101	PAGE_READONLY_EXEC
#define __S110	PAGE_SHARED_EXEC
#define __S111	PAGE_SHARED_EXEC

/*
 * Define this to warn about kernel memory accesses that are
 * done without a 'verify_area(VERIFY_WRITE,..)'
 */
#undef TEST_VERIFY_AREA

#define pte_present(x)	(pte_val(x) & _PAGE_VALID)
#define pte_clear(mm, addr, xp)				\
do {							\
	set_pte_at((mm), (addr), (xp), __pte(0));	\
} while (0)

#define pmd_none(x)	(!pmd_val(x))
#define pmd_present(x)	(!pmd_none(x))
#define pmd_clear(xp)	do { set_pmd(xp, __pmd(0)); } while (0)
#define	pmd_bad(x)	0


#define pages_to_mb(x) ((x) >> (20 - PAGE_SHIFT))

#ifndef __ASSEMBLY__

/*
 * The following only work if pte_present() is true.
 * Undefined behaviour if not..
 */
static inline int pte_user(pte_t pte)	{ return pte_val(pte) & __PAGE_PROT_USER; }
static inline int pte_read(pte_t pte)	{ return pte_val(pte) & __PAGE_PROT_USER; }
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_write(pte_t pte)	{ return pte_val(pte) & __PAGE_PROT_WRITE; }
static inline int pte_special(pte_t pte){ return 0; }

/*
 * The following only works if pte_present() is not true.
 */
static inline int pte_file(pte_t pte)	{ return pte_val(pte) & _PAGE_FILE; }

static inline pte_t pte_rdprotect(pte_t pte)
{
	pte_val(pte) &= ~(__PAGE_PROT_USER|__PAGE_PROT_UWAUX); return pte;
}
static inline pte_t pte_exprotect(pte_t pte)
{
	pte_val(pte) |= _PAGE_NX; return pte;
}

static inline pte_t pte_wrprotect(pte_t pte)
{
	pte_val(pte) &= ~(__PAGE_PROT_WRITE|__PAGE_PROT_UWAUX); return pte;
}

static inline pte_t pte_mkclean(pte_t pte)	{ pte_val(pte) &= ~_PAGE_DIRTY; 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_mkexec(pte_t pte)	{ pte_val(pte) &= ~_PAGE_NX; return pte; }

static inline pte_t pte_mkread(pte_t pte)
{
	pte_val(pte) |= __PAGE_PROT_USER;
	if (pte_write(pte))
		pte_val(pte) |= __PAGE_PROT_UWAUX;
	return pte;
}
static inline pte_t pte_mkwrite(pte_t pte)
{
	pte_val(pte) |= __PAGE_PROT_WRITE;
	if (pte_val(pte) & __PAGE_PROT_USER)
		pte_val(pte) |= __PAGE_PROT_UWAUX;
	return pte;
}

static inline pte_t pte_mkspecial(pte_t pte)	{ return pte; }

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

/*
 * The "pgd_xxx()" functions here are trivial for a folded two-level
 * setup: the pgd is never bad, and a pmd always exists (as it's folded
 * into the pgd entry)
 */
#define pgd_clear(xp)				do { } while (0)

/*
 * Certain architectures need to do special things when PTEs
 * within a page table are directly modified.  Thus, the following
 * hook is made available.
 */
#define set_pte(pteptr, pteval)			(*(pteptr) = pteval)
#define set_pte_at(mm, addr, ptep, pteval)	set_pte((ptep), (pteval))
#define set_pte_atomic(pteptr, pteval)		set_pte((pteptr), (pteval))

/*
 * (pmds are folded into pgds so this doesn't get actually called,
 * but the define is needed for a generic inline function.)
 */
#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)

#define ptep_get_and_clear(mm, addr, ptep) \
	__pte(xchg(&(ptep)->pte, 0))
#define pte_same(a, b)		(pte_val(a) == pte_val(b))
#define pte_page(x)		pfn_to_page(pte_pfn(x))
#define pte_none(x)		(!pte_val(x))
#define pte_pfn(x)		((unsigned long) (pte_val(x) >> PAGE_SHIFT))
#define __pfn_addr(pfn)		((pfn) << PAGE_SHIFT)
#define pfn_pte(pfn, prot)	__pte(__pfn_addr(pfn) | pgprot_val(prot))
#define pfn_pmd(pfn, prot)	__pmd(__pfn_addr(pfn) | pgprot_val(prot))

/*
 * All present user pages are user-executable:
 */
static inline int pte_exec(pte_t pte)
{
	return pte_user(pte);
}

/*
 * All present pages are kernel-executable:
 */
static inline int pte_exec_kernel(pte_t pte)
{
	return 1;
}

/*
 * Bits 0 and 1 are taken, split up the 29 bits of offset
 * into this range:
 */
#define PTE_FILE_MAX_BITS	29

#define pte_to_pgoff(pte)	(pte_val(pte) >> 2)
#define pgoff_to_pte(off)	__pte((off) << 2 | _PAGE_FILE)

/* Encode and de-code a swap entry */
#define __swp_type(x)			(((x).val >> 2) & 0x3f)
#define __swp_offset(x)			((x).val >> 8)
#define __swp_entry(type, offset) \
	((swp_entry_t) { ((type) << 2) | ((offset) << 8) })
#define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x)		__pte((x).val)

static inline
int ptep_test_and_clear_dirty(struct vm_area_struct *vma, unsigned long addr,
			      pte_t *ptep)
{
	if (!pte_dirty(*ptep))
		return 0;
	return test_and_clear_bit(_PAGE_BIT_DIRTY, &ptep->pte);
}

static inline
int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr,
			      pte_t *ptep)
{
	if (!pte_young(*ptep))
		return 0;
	return test_and_clear_bit(_PAGE_BIT_ACCESSED, &ptep->pte);
}

static inline
void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
	pte_val(*ptep) &= ~(__PAGE_PROT_WRITE|__PAGE_PROT_UWAUX);
}

static inline void ptep_mkdirty(pte_t *ptep)
{
	set_bit(_PAGE_BIT_DIRTY, &ptep->pte);
}

/*
 * Macro to mark a page protection value as "uncacheable".  On processors which
 * do not support it, this is a no-op.
 */
#define pgprot_noncached(prot)	__pgprot(pgprot_val(prot) | _PAGE_CACHE)


/*
 * 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 mk_pte(page, pgprot)	pfn_pte(page_to_pfn(page), (pgprot))
#define mk_pte_huge(entry) \
	((entry).pte |= _PAGE_PRESENT | _PAGE_PSE | _PAGE_VALID)

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

#define page_pte(page)	page_pte_prot((page), __pgprot(0))

#define pmd_page_kernel(pmd) \
	((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))

#define pmd_page(pmd)	pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)

#define pmd_large(pmd) \
	((pmd_val(pmd) & (_PAGE_PSE | _PAGE_PRESENT)) == \
	 (_PAGE_PSE | _PAGE_PRESENT))

/*
 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
 *
 * this macro returns the index of the entry in the pgd page which would
 * control the given virtual address
 */
#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))

/*
 * pgd_offset() returns a (pgd_t *)
 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
 */
#define pgd_offset(mm, address)	((mm)->pgd + pgd_index(address))

/*
 * a shortcut which implies the use of the kernel's pgd, instead
 * of a process's
 */
#define pgd_offset_k(address)	pgd_offset(&init_mm, address)

/*
 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
 *
 * this macro returns the index of the entry in the pmd page which would
 * control the given virtual address
 */
#define pmd_index(address) \
	(((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))

/*
 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
 *
 * this macro returns the index of the entry in the pte page which would
 * control the given virtual address
 */
#define pte_index(address) \
	(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))

#define pte_offset_kernel(dir, address) \
	((pte_t *) pmd_page_kernel(*(dir)) +  pte_index(address))

/*
 * Make a given kernel text page executable/non-executable.
 * Returns the previous executability setting of that page (which
 * is used to restore the previous state). Used by the SMP bootup code.
 * NOTE: this is an __init function for security reasons.
 */
static inline int set_kernel_exec(unsigned long vaddr, int enable)
{
	return 0;
}

#define pte_offset_map(dir, address) \
	((pte_t *) page_address(pmd_page(*(dir))) + pte_index(address))
#define pte_unmap(pte)		do {} while (0)

/*
 * The MN10300 has external MMU info in the form of a TLB: this is adapted from
 * the kernel page tables containing the necessary information by tlb-mn10300.S
 */
extern void update_mmu_cache(struct vm_area_struct *vma,
			     unsigned long address, pte_t *ptep);

#endif /* !__ASSEMBLY__ */

#define kern_addr_valid(addr)	(1)

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

#define MK_IOSPACE_PFN(space, pfn)	(pfn)
#define GET_IOSPACE(pfn)		0
#define GET_PFN(pfn)			(pfn)

#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
#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 /* !__ASSEMBLY__ */

#endif /* _ASM_PGTABLE_H */
Commit	Line	Data
b920de1b DH	1	/* MN10300 Page table manipulators and constants
	2	*
	3	* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
	4	* Written by David Howells (dhowells@redhat.com)
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public Licence
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the Licence, or (at your option) any later version.
	10	*
	11	*
	12	* The Linux memory management assumes a three-level page table setup. On
	13	* the i386, we use that, but "fold" the mid level into the top-level page
	14	* table, so that we physically have the same two-level page table as the
	15	* i386 mmu expects.
	16	*
	17	* This file contains the functions and defines necessary to modify and use
	18	* the i386 page table tree for the purposes of the MN10300 TLB handler
	19	* functions.
	20	*/
	21	#ifndef _ASM_PGTABLE_H
	22	#define _ASM_PGTABLE_H
	23
	24	#include <asm/cpu-regs.h>
	25
	26	#ifndef __ASSEMBLY__
	27	#include <asm/processor.h>
	28	#include <asm/cache.h>
	29	#include <linux/threads.h>
	30
	31	#include <asm/bitops.h>
	32
	33	#include <linux/slab.h>
	34	#include <linux/list.h>
	35	#include <linux/spinlock.h>
	36
	37	/*
	38	* ZERO_PAGE is a global shared page that is always zero: used
	39	* for zero-mapped memory areas etc..
	40	*/
	41	#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
	42	extern unsigned long empty_zero_page[1024];
	43	extern spinlock_t pgd_lock;
	44	extern struct page *pgd_list;
	45
	46	extern void pmd_ctor(void , struct kmem_cache , unsigned long);
	47	extern void pgtable_cache_init(void);
	48	extern void paging_init(void);
	49
	50	#endif /* !__ASSEMBLY__ */
	51
	52	/*
	53	* The Linux mn10300 paging architecture only implements both the traditional
	54	* 2-level page tables
	55	*/
	56	#define PGDIR_SHIFT 22
	57	#define PTRS_PER_PGD 1024
	58	#define PTRS_PER_PUD 1 /* we don't really have any PUD physically */
	59	#define PTRS_PER_PMD 1 /* we don't really have any PMD physically */
	60	#define PTRS_PER_PTE 1024
	61
	62	#define PGD_SIZE PAGE_SIZE
	63	#define PMD_SIZE (1UL << PMD_SHIFT)
	64	#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
65	#define PGDIR_MASK (~(PGDIR_SIZE - 1))
66
67	#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
68	#define FIRST_USER_ADDRESS 0
69
70	#define USER_PGD_PTRS (PAGE_OFFSET >> PGDIR_SHIFT)
71	#define KERNEL_PGD_PTRS (PTRS_PER_PGD - USER_PGD_PTRS)
72
73	#define TWOLEVEL_PGDIR_SHIFT 22
74	#define BOOT_USER_PGD_PTRS (__PAGE_OFFSET >> TWOLEVEL_PGDIR_SHIFT)
75	#define BOOT_KERNEL_PGD_PTRS (1024 - BOOT_USER_PGD_PTRS)
76
77	#ifndef __ASSEMBLY__
78	extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
79	#endif
80
81	/*
82	* Unfortunately, due to the way the MMU works on the MN10300, the vmalloc VM
83	* area has to be in the lower half of the virtual address range (the upper
84	* half is not translated through the TLB).
85	*
86	* So in this case, the vmalloc area goes at the bottom of the address map
87	* (leaving a hole at the very bottom to catch addressing errors), and
88	* userspace starts immediately above.
89	*
90	* The vmalloc() routines also leaves a hole of 4kB between each vmalloced
91	* area to catch addressing errors.
92	*/
93	#define VMALLOC_OFFSET (8 * 1024 * 1024)
94	#define VMALLOC_START (0x70000000)
95	#define VMALLOC_END (0x7C000000)
96
97	#ifndef __ASSEMBLY__
98	extern pte_t kernel_vmalloc_ptes[(VMALLOC_END - VMALLOC_START) / PAGE_SIZE];
99	#endif
100
101	/* IPTEL/DPTEL bit assignments */
102	#define _PAGE_BIT_VALID xPTEL_V_BIT
103	#define _PAGE_BIT_ACCESSED xPTEL_UNUSED1_BIT /* mustn't be loaded into IPTEL/DPTEL */
104	#define _PAGE_BIT_NX xPTEL_UNUSED2_BIT /* mustn't be loaded into IPTEL/DPTEL */
105	#define _PAGE_BIT_CACHE xPTEL_C_BIT
106	#define _PAGE_BIT_PRESENT xPTEL_PV_BIT
107	#define _PAGE_BIT_DIRTY xPTEL_D_BIT
108	#define _PAGE_BIT_GLOBAL xPTEL_G_BIT
109
110	#define _PAGE_VALID xPTEL_V
111	#define _PAGE_ACCESSED xPTEL_UNUSED1
112	#define _PAGE_NX xPTEL_UNUSED2 /* no-execute bit */
113	#define _PAGE_CACHE xPTEL_C
114	#define _PAGE_PRESENT xPTEL_PV
115	#define _PAGE_DIRTY xPTEL_D
116	#define _PAGE_PROT xPTEL_PR
117	#define _PAGE_PROT_RKNU xPTEL_PR_ROK
118	#define _PAGE_PROT_WKNU xPTEL_PR_RWK
119	#define _PAGE_PROT_RKRU xPTEL_PR_ROK_ROU
120	#define _PAGE_PROT_WKRU xPTEL_PR_RWK_ROU
121	#define _PAGE_PROT_WKWU xPTEL_PR_RWK_RWU
122	#define _PAGE_GLOBAL xPTEL_G
123	#define _PAGE_PSE xPTEL_PS_4Mb /* 4MB page */
124
125	#define _PAGE_FILE xPTEL_UNUSED1_BIT /* set:pagecache unset:swap */
126
127	#define __PAGE_PROT_UWAUX 0x040
128	#define __PAGE_PROT_USER 0x080
129	#define __PAGE_PROT_WRITE 0x100
130
131	#define _PAGE_PRESENTV (_PAGE_PRESENT\|_PAGE_VALID)
132	#define _PAGE_PROTNONE 0x000 /* If not present */
133
134	#ifndef __ASSEMBLY__
135
136	#define VMALLOC_VMADDR(x) ((unsigned long)(x))
137
138	#define _PAGE_TABLE (_PAGE_PRESENTV \| _PAGE_PROT_WKNU \| _PAGE_ACCESSED \| _PAGE_DIRTY)
139	#define _PAGE_CHG_MASK (PTE_MASK \| _PAGE_ACCESSED \| _PAGE_DIRTY)
140
141	#define __PAGE_NONE (_PAGE_PRESENTV \| _PAGE_PROT_RKNU \| _PAGE_ACCESSED \| _PAGE_CACHE)
142	#define __PAGE_SHARED (_PAGE_PRESENTV \| _PAGE_PROT_WKWU \| _PAGE_ACCESSED \| _PAGE_CACHE)
143	#define __PAGE_COPY (_PAGE_PRESENTV \| _PAGE_PROT_RKRU \| _PAGE_ACCESSED \| _PAGE_CACHE)
144	#define __PAGE_READONLY (_PAGE_PRESENTV \| _PAGE_PROT_RKRU \| _PAGE_ACCESSED \| _PAGE_CACHE)
145
146	#define PAGE_NONE __pgprot(__PAGE_NONE \| _PAGE_NX)
147	#define PAGE_SHARED_NOEXEC __pgprot(__PAGE_SHARED \| _PAGE_NX)
148	#define PAGE_COPY_NOEXEC __pgprot(__PAGE_COPY \| _PAGE_NX)
149	#define PAGE_READONLY_NOEXEC __pgprot(__PAGE_READONLY \| _PAGE_NX)
150	#define PAGE_SHARED_EXEC __pgprot(__PAGE_SHARED)
151	#define PAGE_COPY_EXEC __pgprot(__PAGE_COPY)
152	#define PAGE_READONLY_EXEC __pgprot(__PAGE_READONLY)
153	#define PAGE_COPY PAGE_COPY_NOEXEC
154	#define PAGE_READONLY PAGE_READONLY_NOEXEC
155	#define PAGE_SHARED PAGE_SHARED_EXEC
156
157	#define __PAGE_KERNEL_BASE (_PAGE_PRESENTV \| _PAGE_DIRTY \| _PAGE_ACCESSED \| _PAGE_GLOBAL)
158
159	#define __PAGE_KERNEL (__PAGE_KERNEL_BASE \| _PAGE_PROT_WKNU \| _PAGE_CACHE \| _PAGE_NX)
160	#define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL_BASE \| _PAGE_PROT_WKNU \| _PAGE_NX)
161	#define __PAGE_KERNEL_EXEC (__PAGE_KERNEL & ~_PAGE_NX)
162	#define __PAGE_KERNEL_RO (__PAGE_KERNEL_BASE \| _PAGE_PROT_RKNU \| _PAGE_CACHE \| _PAGE_NX)
163	#define __PAGE_KERNEL_LARGE (__PAGE_KERNEL \| _PAGE_PSE)
164	#define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC \| _PAGE_PSE)
165
166	#define PAGE_KERNEL __pgprot(__PAGE_KERNEL)
167	#define PAGE_KERNEL_RO __pgprot(__PAGE_KERNEL_RO)
168	#define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC)
169	#define PAGE_KERNEL_NOCACHE __pgprot(__PAGE_KERNEL_NOCACHE)
170	#define PAGE_KERNEL_LARGE __pgprot(__PAGE_KERNEL_LARGE)
171	#define PAGE_KERNEL_LARGE_EXEC __pgprot(__PAGE_KERNEL_LARGE_EXEC)
172
173	/*
174	* Whilst the MN10300 can do page protection for execute (given separate data
175	* and insn TLBs), we are not supporting it at the moment. Write permission,
176	* however, always implies read permission (but not execute permission).
177	*/
178	#define __P000 PAGE_NONE
179	#define __P001 PAGE_READONLY_NOEXEC
180	#define __P010 PAGE_COPY_NOEXEC
181	#define __P011 PAGE_COPY_NOEXEC
182	#define __P100 PAGE_READONLY_EXEC
183	#define __P101 PAGE_READONLY_EXEC
184	#define __P110 PAGE_COPY_EXEC
185	#define __P111 PAGE_COPY_EXEC
186
187	#define __S000 PAGE_NONE
188	#define __S001 PAGE_READONLY_NOEXEC
189	#define __S010 PAGE_SHARED_NOEXEC
190	#define __S011 PAGE_SHARED_NOEXEC
191	#define __S100 PAGE_READONLY_EXEC
192	#define __S101 PAGE_READONLY_EXEC
193	#define __S110 PAGE_SHARED_EXEC
194	#define __S111 PAGE_SHARED_EXEC
195
196	/*
197	* Define this to warn about kernel memory accesses that are
198	* done without a 'verify_area(VERIFY_WRITE,..)'
199	*/
200	#undef TEST_VERIFY_AREA
201
202	#define pte_present(x) (pte_val(x) & _PAGE_VALID)
203	#define pte_clear(mm, addr, xp) \
204	do { \
205	set_pte_at((mm), (addr), (xp), __pte(0)); \
206	} while (0)
207
208	#define pmd_none(x) (!pmd_val(x))
209	#define pmd_present(x) (!pmd_none(x))
210	#define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
211	#define pmd_bad(x) 0
212
213
214	#define pages_to_mb(x) ((x) >> (20 - PAGE_SHIFT))
215
216	#ifndef __ASSEMBLY__
217
218	/*
219	* The following only work if pte_present() is true.
220	* Undefined behaviour if not..
221	*/
222	static inline int pte_user(pte_t pte) { return pte_val(pte) & __PAGE_PROT_USER; }
223	static inline int pte_read(pte_t pte) { return pte_val(pte) & __PAGE_PROT_USER; }
224	static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
225	static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
226	static inline int pte_write(pte_t pte) { return pte_val(pte) & __PAGE_PROT_WRITE; }
7e675137	227	static inline int pte_special(pte_t pte){ return 0; }
b920de1b DH	228
	229	/*
	230	* The following only works if pte_present() is not true.
	231	*/
	232	static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
	233
	234	static inline pte_t pte_rdprotect(pte_t pte)
	235	{
	236	pte_val(pte) &= ~(__PAGE_PROT_USER\|__PAGE_PROT_UWAUX); return pte;
	237	}
	238	static inline pte_t pte_exprotect(pte_t pte)
	239	{
	240	pte_val(pte) \|= _PAGE_NX; return pte;
	241	}
	242
	243	static inline pte_t pte_wrprotect(pte_t pte)
	244	{
	245	pte_val(pte) &= ~(__PAGE_PROT_WRITE\|__PAGE_PROT_UWAUX); return pte;
	246	}
	247
	248	static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
	249	static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
	250	static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) \|= _PAGE_DIRTY; return pte; }
	251	static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) \|= _PAGE_ACCESSED; return pte; }
	252	static inline pte_t pte_mkexec(pte_t pte) { pte_val(pte) &= ~_PAGE_NX; return pte; }
	253
	254	static inline pte_t pte_mkread(pte_t pte)
	255	{
	256	pte_val(pte) \|= __PAGE_PROT_USER;
	257	if (pte_write(pte))
	258	pte_val(pte) \|= __PAGE_PROT_UWAUX;
	259	return pte;
	260	}
	261	static inline pte_t pte_mkwrite(pte_t pte)
	262	{
	263	pte_val(pte) \|= __PAGE_PROT_WRITE;
	264	if (pte_val(pte) & __PAGE_PROT_USER)
	265	pte_val(pte) \|= __PAGE_PROT_UWAUX;
	266	return pte;
	267	}
	268
7e675137 NP	269	static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
7e675137 NP	270
b920de1b DH	271	#define pte_ERROR(e) \
	272	printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \
	273	__FILE__, __LINE__, pte_val(e))
	274	#define pgd_ERROR(e) \
	275	printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \
	276	__FILE__, __LINE__, pgd_val(e))
	277
	278	/*
	279	* The "pgd_xxx()" functions here are trivial for a folded two-level
	280	* setup: the pgd is never bad, and a pmd always exists (as it's folded
	281	* into the pgd entry)
	282	*/
	283	#define pgd_clear(xp) do { } while (0)
	284
	285	/*
	286	* Certain architectures need to do special things when PTEs
	287	* within a page table are directly modified. Thus, the following
	288	* hook is made available.
	289	*/
	290	#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
	291	#define set_pte_at(mm, addr, ptep, pteval) set_pte((ptep), (pteval))
	292	#define set_pte_atomic(pteptr, pteval) set_pte((pteptr), (pteval))
	293
	294	/*
	295	* (pmds are folded into pgds so this doesn't get actually called,
	296	* but the define is needed for a generic inline function.)
	297	*/
	298	#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
	299
	300	#define ptep_get_and_clear(mm, addr, ptep) \
	301	__pte(xchg(&(ptep)->pte, 0))
	302	#define pte_same(a, b) (pte_val(a) == pte_val(b))
	303	#define pte_page(x) pfn_to_page(pte_pfn(x))
	304	#define pte_none(x) (!pte_val(x))
	305	#define pte_pfn(x) ((unsigned long) (pte_val(x) >> PAGE_SHIFT))
	306	#define __pfn_addr(pfn) ((pfn) << PAGE_SHIFT)
	307	#define pfn_pte(pfn, prot) __pte(__pfn_addr(pfn) \| pgprot_val(prot))
	308	#define pfn_pmd(pfn, prot) __pmd(__pfn_addr(pfn) \| pgprot_val(prot))
	309
	310	/*
	311	* All present user pages are user-executable:
	312	*/
	313	static inline int pte_exec(pte_t pte)
	314	{
	315	return pte_user(pte);
	316	}
	317
	318	/*
	319	* All present pages are kernel-executable:
	320	*/
	321	static inline int pte_exec_kernel(pte_t pte)
	322	{
	323	return 1;
	324	}
	325
	326	/*
	327	* Bits 0 and 1 are taken, split up the 29 bits of offset
	328	* into this range:
	329	*/
	330	#define PTE_FILE_MAX_BITS 29
	331
	332	#define pte_to_pgoff(pte) (pte_val(pte) >> 2)
	333	#define pgoff_to_pte(off) __pte((off) << 2 \| _PAGE_FILE)
	334
335	/* Encode and de-code a swap entry */
336	#define __swp_type(x) (((x).val >> 2) & 0x3f)
337	#define __swp_offset(x) ((x).val >> 8)
338	#define __swp_entry(type, offset) \
339	((swp_entry_t) { ((type) << 2) \| ((offset) << 8) })
340	#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
341	#define __swp_entry_to_pte(x) __pte((x).val)
342
343	static inline
344	int ptep_test_and_clear_dirty(struct vm_area_struct *vma, unsigned long addr,
345	pte_t *ptep)
346	{
347	if (!pte_dirty(*ptep))
348	return 0;
349	return test_and_clear_bit(_PAGE_BIT_DIRTY, &ptep->pte);
350	}
351
352	static inline
353	int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr,
354	pte_t *ptep)
355	{
356	if (!pte_young(*ptep))
357	return 0;
358	return test_and_clear_bit(_PAGE_BIT_ACCESSED, &ptep->pte);
359	}
360
361	static inline
362	void ptep_set_wrprotect(struct mm_struct mm, unsigned long addr, pte_t ptep)
363	{
364	pte_val(*ptep) &= ~(__PAGE_PROT_WRITE\|__PAGE_PROT_UWAUX);
365	}
366
367	static inline void ptep_mkdirty(pte_t *ptep)
368	{
369	set_bit(_PAGE_BIT_DIRTY, &ptep->pte);
370	}
371
372	/*
373	* Macro to mark a page protection value as "uncacheable". On processors which
374	* do not support it, this is a no-op.
375	*/
376	#define pgprot_noncached(prot) __pgprot(pgprot_val(prot) \| _PAGE_CACHE)
377
378
379	/*
380	* Conversion functions: convert a page and protection to a page entry,
381	* and a page entry and page directory to the page they refer to.
382	*/
383
384	#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
385	#define mk_pte_huge(entry) \
386	((entry).pte \|= _PAGE_PRESENT \| _PAGE_PSE \| _PAGE_VALID)
387
388	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
389	{
390	pte_val(pte) &= _PAGE_CHG_MASK;
391	pte_val(pte) \|= pgprot_val(newprot);
392	return pte;
393	}
394
395	#define page_pte(page) page_pte_prot((page), __pgprot(0))
396
397	#define pmd_page_kernel(pmd) \
398	((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
399
400	#define pmd_page(pmd) pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)
401
402	#define pmd_large(pmd) \
403	((pmd_val(pmd) & (_PAGE_PSE \| _PAGE_PRESENT)) == \
404	(_PAGE_PSE \| _PAGE_PRESENT))
405
406	/*
407	* the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
408	*
409	* this macro returns the index of the entry in the pgd page which would
410	* control the given virtual address
411	*/
412	#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
413
414	/*
415	* pgd_offset() returns a (pgd_t *)
416	* pgd_index() is used get the offset into the pgd page's array of pgd_t's;
417	*/
418	#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
419
420	/*
421	* a shortcut which implies the use of the kernel's pgd, instead
422	* of a process's
423	*/
424	#define pgd_offset_k(address) pgd_offset(&init_mm, address)
425
426	/*
427	* the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
428	*
429	* this macro returns the index of the entry in the pmd page which would
430	* control the given virtual address
431	*/
432	#define pmd_index(address) \
433	(((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
434
435	/*
436	* the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
437	*
438	* this macro returns the index of the entry in the pte page which would
439	* control the given virtual address
440	*/
441	#define pte_index(address) \
442	(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
443
444	#define pte_offset_kernel(dir, address) \
445	((pte_t ) pmd_page_kernel((dir)) + pte_index(address))
446
447	/*
448	* Make a given kernel text page executable/non-executable.
449	* Returns the previous executability setting of that page (which
450	* is used to restore the previous state). Used by the SMP bootup code.
451	* NOTE: this is an __init function for security reasons.
452	*/
453	static inline int set_kernel_exec(unsigned long vaddr, int enable)
454	{
455	return 0;
456	}
457
458	#define pte_offset_map(dir, address) \
459	((pte_t ) page_address(pmd_page((dir))) + pte_index(address))
b920de1b	460	#define pte_unmap(pte) do {} while (0)
b920de1b DH	461
	462	/*
	463	* The MN10300 has external MMU info in the form of a TLB: this is adapted from
	464	* the kernel page tables containing the necessary information by tlb-mn10300.S
	465	*/
	466	extern void update_mmu_cache(struct vm_area_struct *vma,
4b3073e1	467	unsigned long address, pte_t *ptep);
b920de1b DH	468
	469	#endif /* !__ASSEMBLY__ */
	470
	471	#define kern_addr_valid(addr) (1)
	472
	473	#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
	474	remap_pfn_range((vma), (vaddr), (pfn), (size), (prot))
	475
	476	#define MK_IOSPACE_PFN(space, pfn) (pfn)
	477	#define GET_IOSPACE(pfn) 0
	478	#define GET_PFN(pfn) (pfn)
	479
	480	#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
	481	#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
	482	#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
	483	#define __HAVE_ARCH_PTEP_SET_WRPROTECT
	484	#define __HAVE_ARCH_PTEP_MKDIRTY
	485	#define __HAVE_ARCH_PTE_SAME
	486	#include <asm-generic/pgtable.h>
	487
	488	#endif /* !__ASSEMBLY__ */
	489
	490	#endif /* _ASM_PGTABLE_H */