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

/*
 * linux/include/asm-xtensa/page.h
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version2 as
 * published by the Free Software Foundation.
 *
 * Copyright (C) 2001 - 2005 Tensilica Inc.
 */

#ifndef _XTENSA_PAGE_H
#define _XTENSA_PAGE_H

#ifdef __KERNEL__

#include <asm/processor.h>
#include <linux/config.h>

/*
 * PAGE_SHIFT determines the page size
 * PAGE_ALIGN(x) aligns the pointer to the (next) page boundary
 */

#define PAGE_SHIFT		XCHAL_MMU_MIN_PTE_PAGE_SIZE
#define PAGE_SIZE		(1 << PAGE_SHIFT)
#define PAGE_MASK		(~(PAGE_SIZE-1))
#define PAGE_ALIGN(addr)	(((addr)+PAGE_SIZE - 1) & PAGE_MASK)

#define DCACHE_WAY_SIZE		(XCHAL_DCACHE_SIZE / XCHAL_DCACHE_WAYS)
#define PAGE_OFFSET		XCHAL_KSEG_CACHED_VADDR

#ifdef __ASSEMBLY__

#define __pgprot(x)	(x)

#else

/*
 * These are used to make use of C type-checking..
 */

typedef struct { unsigned long pte; } pte_t;		/* page table entry */
typedef struct { unsigned long pgd; } pgd_t;		/* PGD table entry */
typedef struct { unsigned long pgprot; } pgprot_t;

#define pte_val(x)	((x).pte)
#define pgd_val(x)	((x).pgd)
#define pgprot_val(x)	((x).pgprot)

#define __pte(x)	((pte_t) { (x) } )
#define __pgd(x)	((pgd_t) { (x) } )
#define __pgprot(x)	((pgprot_t) { (x) } )

/*
 * Pure 2^n version of get_order
 */

extern __inline__ int get_order(unsigned long size)
{
	int order;
#ifndef XCHAL_HAVE_NSU
	unsigned long x1, x2, x4, x8, x16;

	size = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
	x1  = size & 0xAAAAAAAA;
	x2  = size & 0xCCCCCCCC;
	x4  = size & 0xF0F0F0F0;
	x8  = size & 0xFF00FF00;
	x16 = size & 0xFFFF0000;
	order = x2 ? 2 : 0;
	order += (x16 != 0) * 16;
	order += (x8 != 0) * 8;
	order += (x4 != 0) * 4;
	order += (x1 != 0);

	return order;
#else
	size = (size - 1) >> PAGE_SHIFT;
	asm ("nsau %0, %1" : "=r" (order) : "r" (size));
	return 32 - order;
#endif
}


struct page;
extern void clear_page(void *page);
extern void copy_page(void *to, void *from);

/*
 * If we have cache aliasing and writeback caches, we might have to do
 * some extra work
 */

#if (DCACHE_WAY_SIZE > PAGE_SIZE)
void clear_user_page(void *addr, unsigned long vaddr, struct page* page);
void copy_user_page(void *to,void* from,unsigned long vaddr,struct page* page);
#else
# define clear_user_page(page,vaddr,pg)		clear_page(page)
# define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)
#endif

/*
 * This handles the memory map.  We handle pages at
 * XCHAL_KSEG_CACHED_VADDR for kernels with 32 bit address space.
 * These macros are for conversion of kernel address, not user
 * addresses.
 */

#define __pa(x)			((unsigned long) (x) - PAGE_OFFSET)
#define __va(x)			((void *)((unsigned long) (x) + PAGE_OFFSET))
#define pfn_valid(pfn)		((unsigned long)pfn < max_mapnr)
#ifndef CONFIG_DISCONTIGMEM
# define pfn_to_page(pfn)	(mem_map + (pfn))
# define page_to_pfn(page)	((unsigned long)((page) - mem_map))
#else
# error CONFIG_DISCONTIGMEM not supported
#endif

#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
#define page_to_virt(page)	__va(page_to_pfn(page) << PAGE_SHIFT)
#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)

#define WANT_PAGE_VIRTUAL


#endif /* __ASSEMBLY__ */

#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

#endif /* __KERNEL__ */
#endif /* _XTENSA_PAGE_H */
Commit	Line	Data
9a8fd558 CZ	1	/*
	2	* linux/include/asm-xtensa/page.h
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version2 as
	6	* published by the Free Software Foundation.
	7	*
	8	* Copyright (C) 2001 - 2005 Tensilica Inc.
	9	*/
	10
	11	#ifndef _XTENSA_PAGE_H
	12	#define _XTENSA_PAGE_H
	13
	14	#ifdef __KERNEL__
	15
	16	#include <asm/processor.h>
	17	#include <linux/config.h>
	18
	19	/*
	20	* PAGE_SHIFT determines the page size
	21	* PAGE_ALIGN(x) aligns the pointer to the (next) page boundary
	22	*/
	23
	24	#define PAGE_SHIFT XCHAL_MMU_MIN_PTE_PAGE_SIZE
	25	#define PAGE_SIZE (1 << PAGE_SHIFT)
	26	#define PAGE_MASK (~(PAGE_SIZE-1))
	27	#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE - 1) & PAGE_MASK)
	28
	29	#define DCACHE_WAY_SIZE (XCHAL_DCACHE_SIZE / XCHAL_DCACHE_WAYS)
	30	#define PAGE_OFFSET XCHAL_KSEG_CACHED_VADDR
	31
	32	#ifdef __ASSEMBLY__
	33
	34	#define __pgprot(x) (x)
	35
	36	#else
	37
	38	/*
	39	* These are used to make use of C type-checking..
	40	*/
	41
	42	typedef struct { unsigned long pte; } pte_t; /* page table entry */
	43	typedef struct { unsigned long pgd; } pgd_t; /* PGD table entry */
	44	typedef struct { unsigned long pgprot; } pgprot_t;
	45
	46	#define pte_val(x) ((x).pte)
	47	#define pgd_val(x) ((x).pgd)
	48	#define pgprot_val(x) ((x).pgprot)
	49
	50	#define __pte(x) ((pte_t) { (x) } )
	51	#define __pgd(x) ((pgd_t) { (x) } )
	52	#define __pgprot(x) ((pgprot_t) { (x) } )
	53
	54	/*
	55	* Pure 2^n version of get_order
	56	*/
	57
	58	extern __inline__ int get_order(unsigned long size)
	59	{
	60	int order;
	61	#ifndef XCHAL_HAVE_NSU
	62	unsigned long x1, x2, x4, x8, x16;
	63
	64	size = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
65	x1 = size & 0xAAAAAAAA;
66	x2 = size & 0xCCCCCCCC;
67	x4 = size & 0xF0F0F0F0;
68	x8 = size & 0xFF00FF00;
69	x16 = size & 0xFFFF0000;
70	order = x2 ? 2 : 0;
71	order += (x16 != 0) * 16;
72	order += (x8 != 0) * 8;
73	order += (x4 != 0) * 4;
74	order += (x1 != 0);
75
76	return order;
77	#else
78	size = (size - 1) >> PAGE_SHIFT;
79	asm ("nsau %0, %1" : "=r" (order) : "r" (size));
80	return 32 - order;
81	#endif
82	}
83
84
85	struct page;
86	extern void clear_page(void *page);
87	extern void copy_page(void to, void from);
88
89	/*
90	* If we have cache aliasing and writeback caches, we might have to do
91	* some extra work
92	*/
93
94	#if (DCACHE_WAY_SIZE > PAGE_SIZE)
95	void clear_user_page(void addr, unsigned long vaddr, struct page page);
96	void copy_user_page(void to,void from,unsigned long vaddr,struct page* page);
97	#else
98	# define clear_user_page(page,vaddr,pg) clear_page(page)
99	# define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
100	#endif
101
102	/*
103	* This handles the memory map. We handle pages at
104	* XCHAL_KSEG_CACHED_VADDR for kernels with 32 bit address space.
105	* These macros are for conversion of kernel address, not user
106	* addresses.
107	*/
108
109	#define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
110	#define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET))
111	#define pfn_valid(pfn) ((unsigned long)pfn < max_mapnr)
112	#ifndef CONFIG_DISCONTIGMEM
113	# define pfn_to_page(pfn) (mem_map + (pfn))
114	# define page_to_pfn(page) ((unsigned long)((page) - mem_map))
115	#else
116	# error CONFIG_DISCONTIGMEM not supported
117	#endif
118
119	#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
120	#define page_to_virt(page) __va(page_to_pfn(page) << PAGE_SHIFT)
121	#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
122	#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
123
124	#define WANT_PAGE_VIRTUAL
125
126
127	#endif /* __ASSEMBLY__ */
128
129	#define VM_DATA_DEFAULT_FLAGS (VM_READ \| VM_WRITE \| VM_EXEC \| \
130	VM_MAYREAD \| VM_MAYWRITE \| VM_MAYEXEC)
131
132	#endif /* __KERNEL__ */
133	#endif /* _XTENSA_PAGE_H */