1/* MN10300 Page table definitions
  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#ifndef _ASM_PAGE_H
 12#define _ASM_PAGE_H
 13
 14/* PAGE_SHIFT determines the page size */
 15#define PAGE_SHIFT	12
 16
 17#ifndef __ASSEMBLY__
 18#define PAGE_SIZE	(1UL << PAGE_SHIFT)
 19#define PAGE_MASK	(~(PAGE_SIZE - 1))
 20#else
 21#define PAGE_SIZE	+(1 << PAGE_SHIFT)	/* unary plus marks an
 22						 * immediate val not an addr */
 23#define PAGE_MASK	+(~(PAGE_SIZE - 1))
 24#endif
 25
 26#ifdef __KERNEL__
 27#ifndef __ASSEMBLY__
 28
 29#define clear_page(page)	memset((void *)(page), 0, PAGE_SIZE)
 30#define copy_page(to, from)	memcpy((void *)(to), (void *)(from), PAGE_SIZE)
 31
 32#define clear_user_page(addr, vaddr, page)	clear_page(addr)
 33#define copy_user_page(vto, vfrom, vaddr, to)	copy_page(vto, vfrom)
 34
 35/*
 36 * These are used to make use of C type-checking..
 37 */
 38typedef struct { unsigned long pte; } pte_t;
 39typedef struct { unsigned long pgd; } pgd_t;
 40typedef struct { unsigned long pgprot; } pgprot_t;
 41typedef struct page *pgtable_t;
 42
 43#define PTE_MASK	PAGE_MASK
 44#define HPAGE_SHIFT	22
 45
 46#ifdef CONFIG_HUGETLB_PAGE
 47#define HPAGE_SIZE		((1UL) << HPAGE_SHIFT)
 48#define HPAGE_MASK		(~(HPAGE_SIZE - 1))
 49#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
 50#endif
 51
 52#define pte_val(x)	((x).pte)
 53#define pgd_val(x)	((x).pgd)
 54#define pgprot_val(x)	((x).pgprot)
 55
 56#define __pte(x)	((pte_t) { (x) })
 57#define __pgd(x)	((pgd_t) { (x) })
 58#define __pgprot(x)	((pgprot_t) { (x) })
 59
 60#include <asm-generic/pgtable-nopmd.h>
 61
 62#endif /* !__ASSEMBLY__ */
 63
 64/*
 65 * This handles the memory map.. We could make this a config
 66 * option, but too many people screw it up, and too few need
 67 * it.
 68 *
 69 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
 70 * a virtual address space of one gigabyte, which limits the
 71 * amount of physical memory you can use to about 950MB.
 72 */
 73
 74#ifndef __ASSEMBLY__
 75
 76/* Pure 2^n version of get_order */
 77static inline int get_order(unsigned long size) __attribute__((const));
 78static inline int get_order(unsigned long size)
 79{
 80	int order;
 81
 82	size = (size - 1) >> (PAGE_SHIFT - 1);
 83	order = -1;
 84	do {
 85		size >>= 1;
 86		order++;
 87	} while (size);
 88	return order;
 89}
 90
 91#endif /* __ASSEMBLY__ */
 92
 93#include <asm/page_offset.h>
 94
 95#define __PAGE_OFFSET		(PAGE_OFFSET_RAW)
 96#define PAGE_OFFSET		((unsigned long) __PAGE_OFFSET)
 97
 98/*
 99 * main RAM and kernel working space are coincident at 0x90000000, but to make
100 * life more interesting, there's also an uncached virtual shadow at 0xb0000000
101 * - these mappings are fixed in the MMU
102 */
103#define __pfn_disp		(CONFIG_KERNEL_RAM_BASE_ADDRESS >> PAGE_SHIFT)
104
105#define __pa(x)			((unsigned long)(x))
106#define __va(x)			((void *)(unsigned long)(x))
107#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
108#define pfn_to_page(pfn)	(mem_map + ((pfn) - __pfn_disp))
109#define page_to_pfn(page)	((unsigned long)((page) - mem_map) + __pfn_disp)
110
111#define pfn_valid(pfn)					\
112({							\
113	unsigned long __pfn = (pfn) - __pfn_disp;	\
114	__pfn < max_mapnr;				\
115})
116
117#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
118#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
119#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
120
121#define VM_DATA_DEFAULT_FLAGS \
122	(VM_READ | VM_WRITE | \
123	((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
124		 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
125
126#endif /* __KERNEL__ */
127
128#endif /* _ASM_PAGE_H */