[mirror_ubuntu-hirsute-kernel.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 __PAGETABLE_PUD_FOLDED
#define PTRS_PER_PMD	1	/* we don't really have any PMD physically */
#define __PAGETABLE_PMD_FOLDED
#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	0UL

#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.
 */
#ifndef __ASSEMBLY__
#define VMALLOC_OFFSET	(8UL * 1024 * 1024)
#define VMALLOC_START	(0x70000000UL)
#define VMALLOC_END	(0x7C000000UL)
#else
#define VMALLOC_OFFSET	(8 * 1024 * 1024)
#define VMALLOC_START	(0x70000000)
#define VMALLOC_END	(0x7C000000)
#endif

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

/* IPTEL2/DPTEL2 bit assignments */
#define _PAGE_BIT_VALID		xPTEL2_V_BIT
#define _PAGE_BIT_CACHE		xPTEL2_C_BIT
#define _PAGE_BIT_PRESENT	xPTEL2_PV_BIT
#define _PAGE_BIT_DIRTY		xPTEL2_D_BIT
#define _PAGE_BIT_GLOBAL	xPTEL2_G_BIT
#define _PAGE_BIT_ACCESSED	xPTEL2_UNUSED1_BIT	/* mustn't be loaded into IPTEL2/DPTEL2 */

#define _PAGE_VALID		xPTEL2_V
#define _PAGE_CACHE		xPTEL2_C
#define _PAGE_PRESENT		xPTEL2_PV
#define _PAGE_DIRTY		xPTEL2_D
#define _PAGE_PROT		xPTEL2_PR
#define _PAGE_PROT_RKNU		xPTEL2_PR_ROK
#define _PAGE_PROT_WKNU		xPTEL2_PR_RWK
#define _PAGE_PROT_RKRU		xPTEL2_PR_ROK_ROU
#define _PAGE_PROT_WKRU		xPTEL2_PR_RWK_ROU
#define _PAGE_PROT_WKWU		xPTEL2_PR_RWK_RWU
#define _PAGE_GLOBAL		xPTEL2_G
#define _PAGE_PS_MASK		xPTEL2_PS
#define _PAGE_PS_4Kb		xPTEL2_PS_4Kb
#define _PAGE_PS_128Kb		xPTEL2_PS_128Kb
#define _PAGE_PS_1Kb		xPTEL2_PS_1Kb
#define _PAGE_PS_4Mb		xPTEL2_PS_4Mb
#define _PAGE_PSE		xPTEL2_PS_4Mb		/* 4MB page */
#define _PAGE_CACHE_WT		xPTEL2_CWT
#define _PAGE_ACCESSED		xPTEL2_UNUSED1
#define _PAGE_NX		0			/* no-execute bit */

/* If _PAGE_VALID is clear, we use these: */
#define _PAGE_PROTNONE		0x000		/* If not present */

#define __PAGE_PROT_UWAUX	0x010
#define __PAGE_PROT_USER	0x020
#define __PAGE_PROT_WRITE	0x040

#define _PAGE_PRESENTV		(_PAGE_PRESENT|_PAGE_VALID)

#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)

#define __PAGE_USERIO		(__PAGE_KERNEL_BASE | _PAGE_PROT_WKWU | _PAGE_NX)
#define PAGE_USERIO		__pgprot(__PAGE_USERIO)

/*
 * 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; }

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;
}

/* Encode and de-code a swap entry */
#define __swp_type(x)			(((x).val >> 1) & 0x3f)
#define __swp_offset(x)			((x).val >> 7)
#define __swp_entry(type, offset) \
	((swp_entry_t) { ((type) << 1) | ((offset) << 7) })
#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)

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

/*
 * 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 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 */
c07af4f1	59	#define __PAGETABLE_PUD_FOLDED
b920de1b	60	#define PTRS_PER_PMD 1 /* we don't really have any PMD physically */
c07af4f1	61	#define __PAGETABLE_PMD_FOLDED
b920de1b DH	62	#define PTRS_PER_PTE 1024
	63
	64	#define PGD_SIZE PAGE_SIZE
	65	#define PMD_SIZE (1UL << PMD_SHIFT)
	66	#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
	67	#define PGDIR_MASK (~(PGDIR_SIZE - 1))
	68
	69	#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
d016bf7e	70	#define FIRST_USER_ADDRESS 0UL
b920de1b DH	71
	72	#define USER_PGD_PTRS (PAGE_OFFSET >> PGDIR_SHIFT)
	73	#define KERNEL_PGD_PTRS (PTRS_PER_PGD - USER_PGD_PTRS)
	74
	75	#define TWOLEVEL_PGDIR_SHIFT 22
	76	#define BOOT_USER_PGD_PTRS (__PAGE_OFFSET >> TWOLEVEL_PGDIR_SHIFT)
	77	#define BOOT_KERNEL_PGD_PTRS (1024 - BOOT_USER_PGD_PTRS)
	78
	79	#ifndef __ASSEMBLY__
	80	extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
	81	#endif
	82
	83	/*
	84	* Unfortunately, due to the way the MMU works on the MN10300, the vmalloc VM
	85	* area has to be in the lower half of the virtual address range (the upper
	86	* half is not translated through the TLB).
	87	*
	88	* So in this case, the vmalloc area goes at the bottom of the address map
	89	* (leaving a hole at the very bottom to catch addressing errors), and
	90	* userspace starts immediately above.
	91	*
	92	* The vmalloc() routines also leaves a hole of 4kB between each vmalloced
	93	* area to catch addressing errors.
	94	*/
368dd5ac AT	95	#ifndef __ASSEMBLY__
	96	#define VMALLOC_OFFSET (8UL * 1024 * 1024)
	97	#define VMALLOC_START (0x70000000UL)
	98	#define VMALLOC_END (0x7C000000UL)
	99	#else
b920de1b DH	100	#define VMALLOC_OFFSET (8 * 1024 * 1024)
	101	#define VMALLOC_START (0x70000000)
	102	#define VMALLOC_END (0x7C000000)
368dd5ac	103	#endif
b920de1b DH	104
	105	#ifndef __ASSEMBLY__
	106	extern pte_t kernel_vmalloc_ptes[(VMALLOC_END - VMALLOC_START) / PAGE_SIZE];
	107	#endif
	108
dccbf485 AT	109	/* IPTEL2/DPTEL2 bit assignments */
	110	#define _PAGE_BIT_VALID xPTEL2_V_BIT
	111	#define _PAGE_BIT_CACHE xPTEL2_C_BIT
	112	#define _PAGE_BIT_PRESENT xPTEL2_PV_BIT
	113	#define _PAGE_BIT_DIRTY xPTEL2_D_BIT
	114	#define _PAGE_BIT_GLOBAL xPTEL2_G_BIT
	115	#define _PAGE_BIT_ACCESSED xPTEL2_UNUSED1_BIT /* mustn't be loaded into IPTEL2/DPTEL2 */
	116
	117	#define _PAGE_VALID xPTEL2_V
	118	#define _PAGE_CACHE xPTEL2_C
	119	#define _PAGE_PRESENT xPTEL2_PV
	120	#define _PAGE_DIRTY xPTEL2_D
	121	#define _PAGE_PROT xPTEL2_PR
	122	#define _PAGE_PROT_RKNU xPTEL2_PR_ROK
	123	#define _PAGE_PROT_WKNU xPTEL2_PR_RWK
	124	#define _PAGE_PROT_RKRU xPTEL2_PR_ROK_ROU
	125	#define _PAGE_PROT_WKRU xPTEL2_PR_RWK_ROU
	126	#define _PAGE_PROT_WKWU xPTEL2_PR_RWK_RWU
	127	#define _PAGE_GLOBAL xPTEL2_G
	128	#define _PAGE_PS_MASK xPTEL2_PS
	129	#define _PAGE_PS_4Kb xPTEL2_PS_4Kb
	130	#define _PAGE_PS_128Kb xPTEL2_PS_128Kb
	131	#define _PAGE_PS_1Kb xPTEL2_PS_1Kb
	132	#define _PAGE_PS_4Mb xPTEL2_PS_4Mb
	133	#define _PAGE_PSE xPTEL2_PS_4Mb /* 4MB page */
	134	#define _PAGE_CACHE_WT xPTEL2_CWT
	135	#define _PAGE_ACCESSED xPTEL2_UNUSED1
	136	#define _PAGE_NX 0 /* no-execute bit */
	137
	138	/* If _PAGE_VALID is clear, we use these: */
dccbf485 AT	139	#define _PAGE_PROTNONE 0x000 /* If not present */
	140
	141	#define __PAGE_PROT_UWAUX 0x010
	142	#define __PAGE_PROT_USER 0x020
	143	#define __PAGE_PROT_WRITE 0x040
b920de1b DH	144
b920de1b DH	145	#define _PAGE_PRESENTV (_PAGE_PRESENT\|_PAGE_VALID)
b920de1b DH	146
	147	#ifndef __ASSEMBLY__
	148
	149	#define VMALLOC_VMADDR(x) ((unsigned long)(x))
	150
	151	#define _PAGE_TABLE (_PAGE_PRESENTV \| _PAGE_PROT_WKNU \| _PAGE_ACCESSED \| _PAGE_DIRTY)
	152	#define _PAGE_CHG_MASK (PTE_MASK \| _PAGE_ACCESSED \| _PAGE_DIRTY)
	153
	154	#define __PAGE_NONE (_PAGE_PRESENTV \| _PAGE_PROT_RKNU \| _PAGE_ACCESSED \| _PAGE_CACHE)
	155	#define __PAGE_SHARED (_PAGE_PRESENTV \| _PAGE_PROT_WKWU \| _PAGE_ACCESSED \| _PAGE_CACHE)
	156	#define __PAGE_COPY (_PAGE_PRESENTV \| _PAGE_PROT_RKRU \| _PAGE_ACCESSED \| _PAGE_CACHE)
	157	#define __PAGE_READONLY (_PAGE_PRESENTV \| _PAGE_PROT_RKRU \| _PAGE_ACCESSED \| _PAGE_CACHE)
	158
	159	#define PAGE_NONE __pgprot(__PAGE_NONE \| _PAGE_NX)
	160	#define PAGE_SHARED_NOEXEC __pgprot(__PAGE_SHARED \| _PAGE_NX)
	161	#define PAGE_COPY_NOEXEC __pgprot(__PAGE_COPY \| _PAGE_NX)
	162	#define PAGE_READONLY_NOEXEC __pgprot(__PAGE_READONLY \| _PAGE_NX)
	163	#define PAGE_SHARED_EXEC __pgprot(__PAGE_SHARED)
	164	#define PAGE_COPY_EXEC __pgprot(__PAGE_COPY)
	165	#define PAGE_READONLY_EXEC __pgprot(__PAGE_READONLY)
	166	#define PAGE_COPY PAGE_COPY_NOEXEC
	167	#define PAGE_READONLY PAGE_READONLY_NOEXEC
	168	#define PAGE_SHARED PAGE_SHARED_EXEC
	169
	170	#define __PAGE_KERNEL_BASE (_PAGE_PRESENTV \| _PAGE_DIRTY \| _PAGE_ACCESSED \| _PAGE_GLOBAL)
	171
	172	#define __PAGE_KERNEL (__PAGE_KERNEL_BASE \| _PAGE_PROT_WKNU \| _PAGE_CACHE \| _PAGE_NX)
	173	#define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL_BASE \| _PAGE_PROT_WKNU \| _PAGE_NX)
	174	#define __PAGE_KERNEL_EXEC (__PAGE_KERNEL & ~_PAGE_NX)
	175	#define __PAGE_KERNEL_RO (__PAGE_KERNEL_BASE \| _PAGE_PROT_RKNU \| _PAGE_CACHE \| _PAGE_NX)
	176	#define __PAGE_KERNEL_LARGE (__PAGE_KERNEL \| _PAGE_PSE)
	177	#define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC \| _PAGE_PSE)
	178
	179	#define PAGE_KERNEL __pgprot(__PAGE_KERNEL)
	180	#define PAGE_KERNEL_RO __pgprot(__PAGE_KERNEL_RO)
	181	#define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC)
	182	#define PAGE_KERNEL_NOCACHE __pgprot(__PAGE_KERNEL_NOCACHE)
	183	#define PAGE_KERNEL_LARGE __pgprot(__PAGE_KERNEL_LARGE)
	184	#define PAGE_KERNEL_LARGE_EXEC __pgprot(__PAGE_KERNEL_LARGE_EXEC)
	185
5a226c6f MS	186	#define __PAGE_USERIO (__PAGE_KERNEL_BASE \| _PAGE_PROT_WKWU \| _PAGE_NX)
	187	#define PAGE_USERIO __pgprot(__PAGE_USERIO)
	188
b920de1b DH	189	/*
	190	* Whilst the MN10300 can do page protection for execute (given separate data
	191	* and insn TLBs), we are not supporting it at the moment. Write permission,
	192	* however, always implies read permission (but not execute permission).
	193	*/
	194	#define __P000 PAGE_NONE
	195	#define __P001 PAGE_READONLY_NOEXEC
	196	#define __P010 PAGE_COPY_NOEXEC
	197	#define __P011 PAGE_COPY_NOEXEC
	198	#define __P100 PAGE_READONLY_EXEC
	199	#define __P101 PAGE_READONLY_EXEC
	200	#define __P110 PAGE_COPY_EXEC
	201	#define __P111 PAGE_COPY_EXEC
	202
	203	#define __S000 PAGE_NONE
	204	#define __S001 PAGE_READONLY_NOEXEC
	205	#define __S010 PAGE_SHARED_NOEXEC
	206	#define __S011 PAGE_SHARED_NOEXEC
	207	#define __S100 PAGE_READONLY_EXEC
	208	#define __S101 PAGE_READONLY_EXEC
	209	#define __S110 PAGE_SHARED_EXEC
	210	#define __S111 PAGE_SHARED_EXEC
	211
	212	/*
	213	* Define this to warn about kernel memory accesses that are
	214	* done without a 'verify_area(VERIFY_WRITE,..)'
	215	*/
	216	#undef TEST_VERIFY_AREA
	217
	218	#define pte_present(x) (pte_val(x) & _PAGE_VALID)
	219	#define pte_clear(mm, addr, xp) \
	220	do { \
	221	set_pte_at((mm), (addr), (xp), __pte(0)); \
	222	} while (0)
	223
	224	#define pmd_none(x) (!pmd_val(x))
	225	#define pmd_present(x) (!pmd_none(x))
	226	#define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
	227	#define pmd_bad(x) 0
	228
	229
	230	#define pages_to_mb(x) ((x) >> (20 - PAGE_SHIFT))
	231
	232	#ifndef __ASSEMBLY__
	233
	234	/*
	235	* The following only work if pte_present() is true.
	236	* Undefined behaviour if not..
	237	*/
	238	static inline int pte_user(pte_t pte) { return pte_val(pte) & __PAGE_PROT_USER; }
	239	static inline int pte_read(pte_t pte) { return pte_val(pte) & __PAGE_PROT_USER; }
	240	static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
	241	static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
	242	static inline int pte_write(pte_t pte) { return pte_val(pte) & __PAGE_PROT_WRITE; }
7e675137	243	static inline int pte_special(pte_t pte){ return 0; }
b920de1b	244
b920de1b DH	245	static inline pte_t pte_rdprotect(pte_t pte)
	246	{
	247	pte_val(pte) &= ~(__PAGE_PROT_USER\|__PAGE_PROT_UWAUX); return pte;
	248	}
	249	static inline pte_t pte_exprotect(pte_t pte)
	250	{
	251	pte_val(pte) \|= _PAGE_NX; return pte;
	252	}
	253
	254	static inline pte_t pte_wrprotect(pte_t pte)
	255	{
	256	pte_val(pte) &= ~(__PAGE_PROT_WRITE\|__PAGE_PROT_UWAUX); return pte;
	257	}
	258
	259	static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
	260	static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
	261	static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) \|= _PAGE_DIRTY; return pte; }
	262	static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) \|= _PAGE_ACCESSED; return pte; }
	263	static inline pte_t pte_mkexec(pte_t pte) { pte_val(pte) &= ~_PAGE_NX; return pte; }
	264
	265	static inline pte_t pte_mkread(pte_t pte)
	266	{
	267	pte_val(pte) \|= __PAGE_PROT_USER;
	268	if (pte_write(pte))
	269	pte_val(pte) \|= __PAGE_PROT_UWAUX;
	270	return pte;
	271	}
	272	static inline pte_t pte_mkwrite(pte_t pte)
	273	{
	274	pte_val(pte) \|= __PAGE_PROT_WRITE;
	275	if (pte_val(pte) & __PAGE_PROT_USER)
	276	pte_val(pte) \|= __PAGE_PROT_UWAUX;
	277	return pte;
	278	}
	279
7e675137 NP	280	static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
7e675137 NP	281
b920de1b DH	282	#define pte_ERROR(e) \
	283	printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \
	284	__FILE__, __LINE__, pte_val(e))
	285	#define pgd_ERROR(e) \
	286	printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \
	287	__FILE__, __LINE__, pgd_val(e))
	288
	289	/*
	290	* The "pgd_xxx()" functions here are trivial for a folded two-level
	291	* setup: the pgd is never bad, and a pmd always exists (as it's folded
	292	* into the pgd entry)
	293	*/
	294	#define pgd_clear(xp) do { } while (0)
	295
	296	/*
	297	* Certain architectures need to do special things when PTEs
	298	* within a page table are directly modified. Thus, the following
	299	* hook is made available.
	300	*/
	301	#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
	302	#define set_pte_at(mm, addr, ptep, pteval) set_pte((ptep), (pteval))
	303	#define set_pte_atomic(pteptr, pteval) set_pte((pteptr), (pteval))
	304
	305	/*
	306	* (pmds are folded into pgds so this doesn't get actually called,
	307	* but the define is needed for a generic inline function.)
	308	*/
	309	#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
	310
	311	#define ptep_get_and_clear(mm, addr, ptep) \
	312	__pte(xchg(&(ptep)->pte, 0))
	313	#define pte_same(a, b) (pte_val(a) == pte_val(b))
	314	#define pte_page(x) pfn_to_page(pte_pfn(x))
	315	#define pte_none(x) (!pte_val(x))
	316	#define pte_pfn(x) ((unsigned long) (pte_val(x) >> PAGE_SHIFT))
	317	#define __pfn_addr(pfn) ((pfn) << PAGE_SHIFT)
	318	#define pfn_pte(pfn, prot) __pte(__pfn_addr(pfn) \| pgprot_val(prot))
	319	#define pfn_pmd(pfn, prot) __pmd(__pfn_addr(pfn) \| pgprot_val(prot))
	320
	321	/*
	322	* All present user pages are user-executable:
	323	*/
	324	static inline int pte_exec(pte_t pte)
	325	{
	326	return pte_user(pte);
	327	}
	328
	329	/*
	330	* All present pages are kernel-executable:
	331	*/
	332	static inline int pte_exec_kernel(pte_t pte)
	333	{
	334	return 1;
	335	}
	336
b920de1b	337	/* Encode and de-code a swap entry */
6bf63a8c KS	338	#define __swp_type(x) (((x).val >> 1) & 0x3f)
6bf63a8c KS	339	#define __swp_offset(x) ((x).val >> 7)
b920de1b	340	#define __swp_entry(type, offset) \
6bf63a8c	341	((swp_entry_t) { ((type) << 1) \| ((offset) << 7) })
b920de1b DH	342	#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
	343	#define __swp_entry_to_pte(x) __pte((x).val)
	344
	345	static inline
	346	int ptep_test_and_clear_dirty(struct vm_area_struct *vma, unsigned long addr,
	347	pte_t *ptep)
	348	{
	349	if (!pte_dirty(*ptep))
	350	return 0;
	351	return test_and_clear_bit(_PAGE_BIT_DIRTY, &ptep->pte);
	352	}
	353
	354	static inline
	355	int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr,
	356	pte_t *ptep)
	357	{
	358	if (!pte_young(*ptep))
	359	return 0;
	360	return test_and_clear_bit(_PAGE_BIT_ACCESSED, &ptep->pte);
	361	}
	362
	363	static inline
	364	void ptep_set_wrprotect(struct mm_struct mm, unsigned long addr, pte_t ptep)
	365	{
	366	pte_val(*ptep) &= ~(__PAGE_PROT_WRITE\|__PAGE_PROT_UWAUX);
	367	}
	368
	369	static inline void ptep_mkdirty(pte_t *ptep)
	370	{
	371	set_bit(_PAGE_BIT_DIRTY, &ptep->pte);
	372	}
	373
	374	/*
	375	* Macro to mark a page protection value as "uncacheable". On processors which
	376	* do not support it, this is a no-op.
	377	*/
368dd5ac	378	#define pgprot_noncached(prot) __pgprot(pgprot_val(prot) & ~_PAGE_CACHE)
b920de1b	379
368dd5ac AT	380	/*
	381	* Macro to mark a page protection value as "Write-Through".
	382	* On processors which do not support it, this is a no-op.
	383	*/
	384	#define pgprot_through(prot) __pgprot(pgprot_val(prot) \| _PAGE_CACHE_WT)
b920de1b DH	385
	386	/*
	387	* Conversion functions: convert a page and protection to a page entry,
	388	* and a page entry and page directory to the page they refer to.
	389	*/
	390
	391	#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
	392	#define mk_pte_huge(entry) \
	393	((entry).pte \|= _PAGE_PRESENT \| _PAGE_PSE \| _PAGE_VALID)
	394
	395	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
	396	{
	397	pte_val(pte) &= _PAGE_CHG_MASK;
	398	pte_val(pte) \|= pgprot_val(newprot);
	399	return pte;
	400	}
	401
	402	#define page_pte(page) page_pte_prot((page), __pgprot(0))
	403
	404	#define pmd_page_kernel(pmd) \
	405	((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
	406
	407	#define pmd_page(pmd) pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)
	408
	409	#define pmd_large(pmd) \
	410	((pmd_val(pmd) & (_PAGE_PSE \| _PAGE_PRESENT)) == \
	411	(_PAGE_PSE \| _PAGE_PRESENT))
	412
	413	/*
	414	* the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
	415	*
	416	* this macro returns the index of the entry in the pgd page which would
	417	* control the given virtual address
	418	*/
	419	#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
	420
	421	/*
	422	* pgd_offset() returns a (pgd_t *)
	423	* pgd_index() is used get the offset into the pgd page's array of pgd_t's;
	424	*/
	425	#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
	426
	427	/*
	428	* a shortcut which implies the use of the kernel's pgd, instead
	429	* of a process's
	430	*/
	431	#define pgd_offset_k(address) pgd_offset(&init_mm, address)
	432
	433	/*
	434	* the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
	435	*
	436	* this macro returns the index of the entry in the pmd page which would
	437	* control the given virtual address
	438	*/
	439	#define pmd_index(address) \
	440	(((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
	441
	442	/*
	443	* the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
	444	*
	445	* this macro returns the index of the entry in the pte page which would
	446	* control the given virtual address
	447	*/
	448	#define pte_index(address) \
449	(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
450
451	#define pte_offset_kernel(dir, address) \
452	((pte_t ) pmd_page_kernel((dir)) + pte_index(address))
453
454	/*
455	* Make a given kernel text page executable/non-executable.
456	* Returns the previous executability setting of that page (which
457	* is used to restore the previous state). Used by the SMP bootup code.
458	* NOTE: this is an __init function for security reasons.
459	*/
460	static inline int set_kernel_exec(unsigned long vaddr, int enable)
461	{
462	return 0;
463	}
464
465	#define pte_offset_map(dir, address) \
466	((pte_t ) page_address(pmd_page((dir))) + pte_index(address))
b920de1b	467	#define pte_unmap(pte) do {} while (0)
b920de1b DH	468
	469	/*
	470	* The MN10300 has external MMU info in the form of a TLB: this is adapted from
	471	* the kernel page tables containing the necessary information by tlb-mn10300.S
	472	*/
	473	extern void update_mmu_cache(struct vm_area_struct *vma,
4b3073e1	474	unsigned long address, pte_t *ptep);
b920de1b DH	475
	476	#endif /* !__ASSEMBLY__ */
	477
	478	#define kern_addr_valid(addr) (1)
	479
b920de1b DH	480	#define MK_IOSPACE_PFN(space, pfn) (pfn)
	481	#define GET_IOSPACE(pfn) 0
	482	#define GET_PFN(pfn) (pfn)
	483
	484	#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
	485	#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
	486	#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
	487	#define __HAVE_ARCH_PTEP_SET_WRPROTECT
	488	#define __HAVE_ARCH_PTEP_MKDIRTY
	489	#define __HAVE_ARCH_PTE_SAME
	490	#include <asm-generic/pgtable.h>
	491
	492	#endif /* !__ASSEMBLY__ */
	493
	494	#endif /* _ASM_PGTABLE_H */