1/*
  2 * VM ops
  3 *
  4 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
  5 * Copyright (C) 2008-2009 PetaLogix
  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>
 20#include <asm/asm-compat.h>
 21#include <linux/const.h>
 22
 23#ifdef __KERNEL__
 24
 25/* PAGE_SHIFT determines the page size */
 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)
 36#define PAGE_MASK	(~(PAGE_SIZE-1))
 37
 38#define LOAD_OFFSET	ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR))
 39
 40#ifndef __ASSEMBLY__
 41
 42/* MS be sure that SLAB allocates aligned objects */
 43#define ARCH_DMA_MINALIGN	L1_CACHE_BYTES
 44
 45#define ARCH_SLAB_MINALIGN	L1_CACHE_BYTES
 46
 47#define PAGE_UP(addr)	(((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
 48#define PAGE_DOWN(addr)	((addr)&(~((PAGE_SIZE)-1)))
 49
 50#ifndef CONFIG_MMU
 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 */
 56extern unsigned int __page_offset;
 57#define PAGE_OFFSET __page_offset
 58
 59#else /* CONFIG_MMU */
 60
 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
 69
 70/*
 71 * The basic type of a PTE - 32 bit physical addressing.
 72 */
 73typedef 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
 79# define copy_page(to, from)			memcpy((to), (from), PAGE_SIZE)
 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) \
 84			memcpy((vto), (vfrom), PAGE_SIZE)
 85
 86/*
 87 * These are used to make use of C type-checking..
 88 */
 89typedef struct page *pgtable_t;
 90typedef struct { unsigned long	pte; }		pte_t;
 91typedef struct { unsigned long	pgprot; }	pgprot_t;
 92/* FIXME this can depend on linux kernel version */
 93#   ifdef CONFIG_MMU
 94typedef struct { unsigned long pmd; } pmd_t;
 95typedef struct { unsigned long pgd; } pgd_t;
 96#   else /* CONFIG_MMU */
 97typedef struct { unsigned long	ste[64]; }	pmd_t;
 98typedef struct { pmd_t		pue[1]; }	pud_t;
 99typedef struct { pud_t		pge[1]; }	pgd_t;
100#   endif /* CONFIG_MMU */
101
102# define pte_val(x)	((x).pte)
103# define pgprot_val(x)	((x).pgprot)
104
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 */
113
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) })
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
133extern unsigned long max_low_pfn;
134extern unsigned long min_low_pfn;
135extern unsigned long max_pfn;
136
137extern unsigned long memory_start;
138extern unsigned long memory_size;
139extern unsigned long lowmem_size;
140
141extern unsigned long kernel_tlb;
142
143extern int page_is_ram(unsigned long pfn);
144
145# define phys_to_pfn(phys)	(PFN_DOWN(phys))
146# define pfn_to_phys(pfn)	(PFN_PHYS(pfn))
147
148# define virt_to_pfn(vaddr)	(phys_to_pfn((__pa(vaddr))))
149# define pfn_to_virt(pfn)	__va(pfn_to_phys((pfn)))
150
151#  ifdef CONFIG_MMU
152
153#  define virt_to_page(kaddr)	(pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
154#  define page_to_virt(page)   __va(page_to_pfn(page) << PAGE_SHIFT)
155#  define page_to_phys(page)     (page_to_pfn(page) << PAGE_SHIFT)
156
157#  else /* CONFIG_MMU */
158#  define virt_to_page(vaddr)	(pfn_to_page(virt_to_pfn(vaddr)))
159#  define page_to_virt(page)	(pfn_to_virt(page_to_pfn(page)))
160#  define page_to_phys(page)	(pfn_to_phys(page_to_pfn(page)))
161#  define page_to_bus(page)	(page_to_phys(page))
162#  define phys_to_page(paddr)	(pfn_to_page(phys_to_pfn(paddr)))
163#  endif /* CONFIG_MMU */
164
165#  ifndef CONFIG_MMU
166#  define pfn_valid(pfn)	(((pfn) >= min_low_pfn) && \
167				((pfn) <= (min_low_pfn + max_mapnr)))
168#  define ARCH_PFN_OFFSET	(PAGE_OFFSET >> PAGE_SHIFT)
169#  else /* CONFIG_MMU */
170#  define ARCH_PFN_OFFSET	(memory_start >> PAGE_SHIFT)
171#  define pfn_valid(pfn)	((pfn) < (max_mapnr + ARCH_PFN_OFFSET))
172#  define VALID_PAGE(page) 	((page - mem_map) < max_mapnr)
173#  endif /* CONFIG_MMU */
174
175# endif /* __ASSEMBLY__ */
176
177#define	virt_addr_valid(vaddr)	(pfn_valid(virt_to_pfn(vaddr)))
178
179# define __pa(x)	__virt_to_phys((unsigned long)(x))
180# define __va(x)	((void *)__phys_to_virt((unsigned long)(x)))
181
182/* Convert between virtual and physical address for MMU. */
183/* Handle MicroBlaze processor with virtual memory. */
184#ifndef CONFIG_MMU
185#define __virt_to_phys(addr)	addr
186#define __phys_to_virt(addr)	addr
187#define tophys(rd, rs)	addik rd, rs, 0
188#define tovirt(rd, rs)	addik rd, rs, 0
189#else
190#define __virt_to_phys(addr) \
191	((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
192#define __phys_to_virt(addr) \
193	((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
194#define tophys(rd, rs) \
195	addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
196#define tovirt(rd, rs) \
197	addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
198#endif /* CONFIG_MMU */
199
200#define TOPHYS(addr)  __virt_to_phys(addr)
201
202#ifdef CONFIG_MMU
203
204#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
205				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
206#endif /* CONFIG_MMU */
207
208#endif /* __KERNEL__ */
209
210#include <asm-generic/memory_model.h>
211#include <asm-generic/getorder.h>
212
213#endif /* _ASM_MICROBLAZE_PAGE_H */