[net-next-2.6.git] / arch / microblaze / include / asm / page.h

/*
 * VM ops
 *
 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
 * Copyright (C) 2008-2009 PetaLogix
 * Copyright (C) 2006 Atmark Techno, Inc.
 * Changes for MMU support:
 *    Copyright (C) 2007 Xilinx, Inc.  All rights reserved.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License. See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#ifndef _ASM_MICROBLAZE_PAGE_H
#define _ASM_MICROBLAZE_PAGE_H

#include <linux/pfn.h>
#include <asm/setup.h>
#include <asm/asm-compat.h>
#include <linux/const.h>

#ifdef __KERNEL__

/* PAGE_SHIFT determines the page size */
#if defined(CONFIG_MICROBLAZE_32K_PAGES)
#define PAGE_SHIFT		15
#elif defined(CONFIG_MICROBLAZE_16K_PAGES)
#define PAGE_SHIFT		14
#elif defined(CONFIG_MICROBLAZE_8K_PAGES)
#define PAGE_SHIFT		13
#else
#define PAGE_SHIFT		12
#endif
#define PAGE_SIZE	(ASM_CONST(1) << PAGE_SHIFT)
#define PAGE_MASK	(~(PAGE_SIZE-1))

#define LOAD_OFFSET	ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR))

#ifndef __ASSEMBLY__

/* MS be sure that SLAB allocates aligned objects */
#define ARCH_DMA_MINALIGN	L1_CACHE_BYTES

#define ARCH_SLAB_MINALIGN	L1_CACHE_BYTES

#define PAGE_UP(addr)	(((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
#define PAGE_DOWN(addr)	((addr)&(~((PAGE_SIZE)-1)))

#ifndef CONFIG_MMU
/*
 * PAGE_OFFSET -- the first address of the first page of memory. When not
 * using MMU this corresponds to the first free page in physical memory (aligned
 * on a page boundary).
 */
extern unsigned int __page_offset;
#define PAGE_OFFSET __page_offset

#else /* CONFIG_MMU */

/*
 * PAGE_OFFSET -- the first address of the first page of memory. With MMU
 * it is set to the kernel start address (aligned on a page boundary).
 *
 * CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used
 * in arch/microblaze/Makefile.
 */
#define PAGE_OFFSET	CONFIG_KERNEL_START

/*
 * The basic type of a PTE - 32 bit physical addressing.
 */
typedef unsigned long pte_basic_t;
#define PTE_SHIFT	(PAGE_SHIFT - 2)	/* 1024 ptes per page */
#define PTE_FMT		"%.8lx"

#endif /* CONFIG_MMU */

# define copy_page(to, from)			memcpy((to), (from), PAGE_SIZE)
# define clear_page(pgaddr)			memset((pgaddr), 0, PAGE_SIZE)

# define clear_user_page(pgaddr, vaddr, page)	memset((pgaddr), 0, PAGE_SIZE)
# define copy_user_page(vto, vfrom, vaddr, topg) \
			memcpy((vto), (vfrom), PAGE_SIZE)

/*
 * These are used to make use of C type-checking..
 */
typedef struct page *pgtable_t;
typedef struct { unsigned long	pte; }		pte_t;
typedef struct { unsigned long	pgprot; }	pgprot_t;
/* FIXME this can depend on linux kernel version */
#   ifdef CONFIG_MMU
typedef struct { unsigned long pmd; } pmd_t;
typedef struct { unsigned long pgd; } pgd_t;
#   else /* CONFIG_MMU */
typedef struct { unsigned long	ste[64]; }	pmd_t;
typedef struct { pmd_t		pue[1]; }	pud_t;
typedef struct { pud_t		pge[1]; }	pgd_t;
#   endif /* CONFIG_MMU */

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

#   ifdef CONFIG_MMU
#   define pmd_val(x)      ((x).pmd)
#   define pgd_val(x)      ((x).pgd)
#   else  /* CONFIG_MMU */
#   define pmd_val(x)	((x).ste[0])
#   define pud_val(x)	((x).pue[0])
#   define pgd_val(x)	((x).pge[0])
#   endif  /* CONFIG_MMU */

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

/**
 * Conversions for virtual address, physical address, pfn, and struct
 * page are defined in the following files.
 *
 * virt -+
 *	 | asm-microblaze/page.h
 * phys -+
 *	 | linux/pfn.h
 *  pfn -+
 *	 | asm-generic/memory_model.h
 * page -+
 *
 */

extern unsigned long max_low_pfn;
extern unsigned long min_low_pfn;
extern unsigned long max_pfn;

extern unsigned long memory_start;
extern unsigned long memory_end;
extern unsigned long memory_size;

extern int page_is_ram(unsigned long pfn);

# define phys_to_pfn(phys)	(PFN_DOWN(phys))
# define pfn_to_phys(pfn)	(PFN_PHYS(pfn))

# define virt_to_pfn(vaddr)	(phys_to_pfn((__pa(vaddr))))
# define pfn_to_virt(pfn)	__va(pfn_to_phys((pfn)))

#  ifdef CONFIG_MMU

#  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 page_to_phys(page)     (page_to_pfn(page) << PAGE_SHIFT)

#  else /* CONFIG_MMU */
#  define virt_to_page(vaddr)	(pfn_to_page(virt_to_pfn(vaddr)))
#  define page_to_virt(page)	(pfn_to_virt(page_to_pfn(page)))
#  define page_to_phys(page)	(pfn_to_phys(page_to_pfn(page)))
#  define page_to_bus(page)	(page_to_phys(page))
#  define phys_to_page(paddr)	(pfn_to_page(phys_to_pfn(paddr)))
#  endif /* CONFIG_MMU */

#  ifndef CONFIG_MMU
#  define pfn_valid(pfn)	(((pfn) >= min_low_pfn) && \
				((pfn) <= (min_low_pfn + max_mapnr)))
#  define ARCH_PFN_OFFSET	(PAGE_OFFSET >> PAGE_SHIFT)
#  else /* CONFIG_MMU */
#  define ARCH_PFN_OFFSET	(memory_start >> PAGE_SHIFT)
#  define pfn_valid(pfn)	((pfn) < (max_mapnr + ARCH_PFN_OFFSET))
#  define VALID_PAGE(page) 	((page - mem_map) < max_mapnr)
#  endif /* CONFIG_MMU */

# endif /* __ASSEMBLY__ */

#define	virt_addr_valid(vaddr)	(pfn_valid(virt_to_pfn(vaddr)))


#  ifndef CONFIG_MMU
#  define __pa(vaddr)	((unsigned long) (vaddr))
#  define __va(paddr)	((void *) (paddr))
#  else /* CONFIG_MMU */
#  define __pa(x)	__virt_to_phys((unsigned long)(x))
#  define __va(x)	((void *)__phys_to_virt((unsigned long)(x)))
#  endif /* CONFIG_MMU */


/* Convert between virtual and physical address for MMU. */
/* Handle MicroBlaze processor with virtual memory. */
#ifndef CONFIG_MMU
#define __virt_to_phys(addr)	addr
#define __phys_to_virt(addr)	addr
#define tophys(rd, rs)	addik rd, rs, 0
#define tovirt(rd, rs)	addik rd, rs, 0
#else
#define __virt_to_phys(addr) \
	((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
#define __phys_to_virt(addr) \
	((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
#define tophys(rd, rs) \
	addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
#define tovirt(rd, rs) \
	addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
#endif /* CONFIG_MMU */

#define TOPHYS(addr)  __virt_to_phys(addr)

#ifdef CONFIG_MMU
#ifdef CONFIG_CONTIGUOUS_PAGE_ALLOC
#define WANT_PAGE_VIRTUAL 1 /* page alloc 2 relies on this */
#endif

#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
#endif /* CONFIG_MMU */

#endif /* __KERNEL__ */

#include <asm-generic/memory_model.h>
#include <asm-generic/getorder.h>

#endif /* _ASM_MICROBLAZE_PAGE_H */
Commit	Line	Data
4b87d7a4	1	/*
1f84e1ea MS	2	* VM ops
	3	*
	4	* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
	5	* Copyright (C) 2008-2009 PetaLogix
4b87d7a4 MS	6	* Copyright (C) 2006 Atmark Techno, Inc.
	7	* Changes for MMU support:
	8	* Copyright (C) 2007 Xilinx, Inc. All rights reserved.
	9	*
	10	* This file is subject to the terms and conditions of the GNU General Public
	11	* License. See the file "COPYING" in the main directory of this archive
	12	* for more details.
	13	*/
	14
	15	#ifndef _ASM_MICROBLAZE_PAGE_H
	16	#define _ASM_MICROBLAZE_PAGE_H
	17
	18	#include <linux/pfn.h>
	19	#include <asm/setup.h>
a1253977	20	#include <asm/asm-compat.h>
1f84e1ea MS	21	#include <linux/const.h>
	22
	23	#ifdef __KERNEL__
4b87d7a4 MS	24
4b87d7a4 MS	25	/* PAGE_SHIFT determines the page size */
ba9c4f88 SM	26	#if defined(CONFIG_MICROBLAZE_32K_PAGES)
	27	#define PAGE_SHIFT 15
	28	#elif defined(CONFIG_MICROBLAZE_16K_PAGES)
	29	#define PAGE_SHIFT 14
	30	#elif defined(CONFIG_MICROBLAZE_8K_PAGES)
	31	#define PAGE_SHIFT 13
	32	#else
	33	#define PAGE_SHIFT 12
	34	#endif
	35	#define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT)
4b87d7a4 MS	36	#define PAGE_MASK (~(PAGE_SIZE-1))
4b87d7a4 MS	37
a1253977 JW	38	#define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR))
a1253977 JW	39
4b87d7a4 MS	40	#ifndef __ASSEMBLY__
4b87d7a4 MS	41
de925d9d	42	/* MS be sure that SLAB allocates aligned objects */
a6eb9fe1	43	#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
de925d9d	44
ffe57d02 MS	45	#define ARCH_SLAB_MINALIGN L1_CACHE_BYTES
ffe57d02 MS	46
4b87d7a4 MS	47	#define PAGE_UP(addr) (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
	48	#define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1)))
	49
1f84e1ea	50	#ifndef CONFIG_MMU
4b87d7a4 MS	51	/*
	52	* PAGE_OFFSET -- the first address of the first page of memory. When not
	53	* using MMU this corresponds to the first free page in physical memory (aligned
	54	* on a page boundary).
	55	*/
	56	extern unsigned int __page_offset;
	57	#define PAGE_OFFSET __page_offset
	58
1f84e1ea	59	#else /* CONFIG_MMU */
4b87d7a4	60
1f84e1ea MS	61	/*
	62	* PAGE_OFFSET -- the first address of the first page of memory. With MMU
	63	* it is set to the kernel start address (aligned on a page boundary).
	64	*
	65	* CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used
	66	* in arch/microblaze/Makefile.
	67	*/
	68	#define PAGE_OFFSET CONFIG_KERNEL_START
4b87d7a4	69
1f84e1ea MS	70	/*
	71	* The basic type of a PTE - 32 bit physical addressing.
	72	*/
	73	typedef unsigned long pte_basic_t;
	74	#define PTE_SHIFT (PAGE_SHIFT - 2) /* 1024 ptes per page */
	75	#define PTE_FMT "%.8lx"
	76
	77	#endif /* CONFIG_MMU */
	78
43f2a6e8	79	# define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
1f84e1ea MS	80	# define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE)
	81
	82	# define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE)
	83	# define copy_user_page(vto, vfrom, vaddr, topg) \
4b87d7a4 MS	84	memcpy((vto), (vfrom), PAGE_SIZE)
	85
	86	/*
	87	* These are used to make use of C type-checking..
	88	*/
	89	typedef struct page *pgtable_t;
	90	typedef struct { unsigned long pte; } pte_t;
	91	typedef struct { unsigned long pgprot; } pgprot_t;
1f84e1ea MS	92	/* FIXME this can depend on linux kernel version */
	93	# ifdef CONFIG_MMU
	94	typedef struct { unsigned long pmd; } pmd_t;
	95	typedef struct { unsigned long pgd; } pgd_t;
	96	# else /* CONFIG_MMU */
4b87d7a4 MS	97	typedef struct { unsigned long ste[64]; } pmd_t;
	98	typedef struct { pmd_t pue[1]; } pud_t;
	99	typedef struct { pud_t pge[1]; } pgd_t;
1f84e1ea	100	# endif /* CONFIG_MMU */
4b87d7a4	101
1f84e1ea MS	102	# define pte_val(x) ((x).pte)
1f84e1ea MS	103	# define pgprot_val(x) ((x).pgprot)
4b87d7a4	104
1f84e1ea MS	105	# ifdef CONFIG_MMU
	106	# define pmd_val(x) ((x).pmd)
	107	# define pgd_val(x) ((x).pgd)
	108	# else /* CONFIG_MMU */
	109	# define pmd_val(x) ((x).ste[0])
	110	# define pud_val(x) ((x).pue[0])
	111	# define pgd_val(x) ((x).pge[0])
	112	# endif /* CONFIG_MMU */
4b87d7a4	113
1f84e1ea MS	114	# define __pte(x) ((pte_t) { (x) })
	115	# define __pmd(x) ((pmd_t) { (x) })
	116	# define __pgd(x) ((pgd_t) { (x) })
	117	# define __pgprot(x) ((pgprot_t) { (x) })
4b87d7a4 MS	118
	119	/**
	120	* Conversions for virtual address, physical address, pfn, and struct
	121	* page are defined in the following files.
	122	*
	123	* virt -+
	124	* \| asm-microblaze/page.h
	125	* phys -+
	126	* \| linux/pfn.h
	127	* pfn -+
	128	* \| asm-generic/memory_model.h
	129	* page -+
	130	*
	131	*/
	132
	133	extern unsigned long max_low_pfn;
	134	extern unsigned long min_low_pfn;
	135	extern unsigned long max_pfn;
	136
1f84e1ea MS	137	extern unsigned long memory_start;
	138	extern unsigned long memory_end;
	139	extern unsigned long memory_size;
4b87d7a4	140
1f84e1ea	141	extern int page_is_ram(unsigned long pfn);
4b87d7a4	142
1f84e1ea MS	143	# define phys_to_pfn(phys) (PFN_DOWN(phys))
1f84e1ea MS	144	# define pfn_to_phys(pfn) (PFN_PHYS(pfn))
4b87d7a4	145
1f84e1ea MS	146	# define virt_to_pfn(vaddr) (phys_to_pfn((__pa(vaddr))))
1f84e1ea MS	147	# define pfn_to_virt(pfn) __va(pfn_to_phys((pfn)))
4b87d7a4	148
1f84e1ea	149	# ifdef CONFIG_MMU
d79f3b06 MS	150
	151	# define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
	152	# define page_to_virt(page) __va(page_to_pfn(page) << PAGE_SHIFT)
	153	# define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
	154
1f84e1ea MS	155	# else /* CONFIG_MMU */
	156	# define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
	157	# define page_to_virt(page) (pfn_to_virt(page_to_pfn(page)))
	158	# define page_to_phys(page) (pfn_to_phys(page_to_pfn(page)))
	159	# define page_to_bus(page) (page_to_phys(page))
	160	# define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr)))
	161	# endif /* CONFIG_MMU */
4b87d7a4	162
1f84e1ea	163	# ifndef CONFIG_MMU
5dd48a23	164	# define pfn_valid(pfn) (((pfn) >= min_low_pfn) && \
5dd48a23	165	((pfn) <= (min_low_pfn + max_mapnr)))
1f84e1ea MS	166	# define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
	167	# else /* CONFIG_MMU */
	168	# define ARCH_PFN_OFFSET (memory_start >> PAGE_SHIFT)
	169	# define pfn_valid(pfn) ((pfn) < (max_mapnr + ARCH_PFN_OFFSET))
	170	# define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
	171	# endif /* CONFIG_MMU */
4b87d7a4	172
1f84e1ea	173	# endif /* __ASSEMBLY__ */
4b87d7a4	174
1f84e1ea	175	#define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr)))
4b87d7a4	176
4b87d7a4	177
1f84e1ea MS	178	# ifndef CONFIG_MMU
	179	# define __pa(vaddr) ((unsigned long) (vaddr))
	180	# define __va(paddr) ((void *) (paddr))
	181	# else /* CONFIG_MMU */
	182	# define __pa(x) __virt_to_phys((unsigned long)(x))
	183	# define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
	184	# endif /* CONFIG_MMU */
	185
4b87d7a4	186
1f84e1ea MS	187	/* Convert between virtual and physical address for MMU. */
	188	/* Handle MicroBlaze processor with virtual memory. */
	189	#ifndef CONFIG_MMU
4b87d7a4 MS	190	#define __virt_to_phys(addr) addr
4b87d7a4 MS	191	#define __phys_to_virt(addr) addr
1f84e1ea MS	192	#define tophys(rd, rs) addik rd, rs, 0
	193	#define tovirt(rd, rs) addik rd, rs, 0
	194	#else
	195	#define __virt_to_phys(addr) \
	196	((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
	197	#define __phys_to_virt(addr) \
	198	((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
	199	#define tophys(rd, rs) \
	200	addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
	201	#define tovirt(rd, rs) \
	202	addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
	203	#endif /* CONFIG_MMU */
4b87d7a4 MS	204
	205	#define TOPHYS(addr) __virt_to_phys(addr)
	206
1f84e1ea MS	207	#ifdef CONFIG_MMU
	208	#ifdef CONFIG_CONTIGUOUS_PAGE_ALLOC
	209	#define WANT_PAGE_VIRTUAL 1 /* page alloc 2 relies on this */
	210	#endif
	211
	212	#define VM_DATA_DEFAULT_FLAGS (VM_READ \| VM_WRITE \| VM_EXEC \| \
	213	VM_MAYREAD \| VM_MAYWRITE \| VM_MAYEXEC)
	214	#endif /* CONFIG_MMU */
	215
4b87d7a4 MS	216	#endif /* __KERNEL__ */
	217
	218	#include <asm-generic/memory_model.h>
5b17e1cd	219	#include <asm-generic/getorder.h>
4b87d7a4 MS	220
4b87d7a4 MS	221	#endif /* _ASM_MICROBLAZE_PAGE_H */