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_64K_PAGES)
27#define PAGE_SHIFT		16
28#elif defined(CONFIG_MICROBLAZE_16K_PAGES)
29#define PAGE_SHIFT		14
30#else
31#define PAGE_SHIFT		12
32#endif
33#define PAGE_SIZE	(ASM_CONST(1) << PAGE_SHIFT)
34#define PAGE_MASK	(~(PAGE_SIZE-1))
35
36#define LOAD_OFFSET	ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR))
37
38#define PTE_SHIFT	(PAGE_SHIFT - 2)	/* 1024 ptes per page */
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_FMT		"%.8lx"
75
76#endif /* CONFIG_MMU */
77
78# define copy_page(to, from)			memcpy((to), (from), PAGE_SIZE)
79# define clear_page(pgaddr)			memset((pgaddr), 0, PAGE_SIZE)
80
81# define clear_user_page(pgaddr, vaddr, page)	memset((pgaddr), 0, PAGE_SIZE)
82# define copy_user_page(vto, vfrom, vaddr, topg) \
83			memcpy((vto), (vfrom), PAGE_SIZE)
84
85/*
86 * These are used to make use of C type-checking..
87 */
88typedef struct page *pgtable_t;
89typedef struct { unsigned long	pte; }		pte_t;
90typedef struct { unsigned long	pgprot; }	pgprot_t;
91/* FIXME this can depend on linux kernel version */
92#   ifdef CONFIG_MMU
93typedef struct { unsigned long pmd; } pmd_t;
94typedef struct { unsigned long pgd; } pgd_t;
95#   else /* CONFIG_MMU */
96typedef struct { unsigned long	ste[64]; }	pmd_t;
97typedef struct { pmd_t		pue[1]; }	pud_t;
98typedef struct { pud_t		pge[1]; }	pgd_t;
99#   endif /* CONFIG_MMU */
100
101# define pte_val(x)	((x).pte)
102# define pgprot_val(x)	((x).pgprot)
103
104#   ifdef CONFIG_MMU
105#   define pmd_val(x)      ((x).pmd)
106#   define pgd_val(x)      ((x).pgd)
107#   else  /* CONFIG_MMU */
108#   define pmd_val(x)	((x).ste[0])
109#   define pud_val(x)	((x).pue[0])
110#   define pgd_val(x)	((x).pge[0])
111#   endif  /* CONFIG_MMU */
112
113# define __pte(x)	((pte_t) { (x) })
114# define __pmd(x)	((pmd_t) { (x) })
115# define __pgd(x)	((pgd_t) { (x) })
116# define __pgprot(x)	((pgprot_t) { (x) })
117
118/**
119 * Conversions for virtual address, physical address, pfn, and struct
120 * page are defined in the following files.
121 *
122 * virt -+
123 *	 | asm-microblaze/page.h
124 * phys -+
125 *	 | linux/pfn.h
126 *  pfn -+
127 *	 | asm-generic/memory_model.h
128 * page -+
129 *
130 */
131
132extern unsigned long max_low_pfn;
133extern unsigned long min_low_pfn;
134extern unsigned long max_pfn;
135
136extern unsigned long memory_start;
137extern unsigned long memory_size;
138extern unsigned long lowmem_size;
139
140extern unsigned long kernel_tlb;
141
142extern int page_is_ram(unsigned long pfn);
143
144# define phys_to_pfn(phys)	(PFN_DOWN(phys))
145# define pfn_to_phys(pfn)	(PFN_PHYS(pfn))
146
147# define virt_to_pfn(vaddr)	(phys_to_pfn((__pa(vaddr))))
148# define pfn_to_virt(pfn)	__va(pfn_to_phys((pfn)))
149
150#  ifdef CONFIG_MMU
151
152#  define virt_to_page(kaddr)	(pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
153#  define page_to_virt(page)   __va(page_to_pfn(page) << PAGE_SHIFT)
154#  define page_to_phys(page)     (page_to_pfn(page) << PAGE_SHIFT)
155
156#  else /* CONFIG_MMU */
157#  define virt_to_page(vaddr)	(pfn_to_page(virt_to_pfn(vaddr)))
158#  define page_to_virt(page)	(pfn_to_virt(page_to_pfn(page)))
159#  define page_to_phys(page)	(pfn_to_phys(page_to_pfn(page)))
160#  define page_to_bus(page)	(page_to_phys(page))
161#  define phys_to_page(paddr)	(pfn_to_page(phys_to_pfn(paddr)))
162#  endif /* CONFIG_MMU */
163
164#  ifndef CONFIG_MMU
165#  define pfn_valid(pfn)	(((pfn) >= min_low_pfn) && \
166				((pfn) <= (min_low_pfn + max_mapnr)))
167#  define ARCH_PFN_OFFSET	(PAGE_OFFSET >> PAGE_SHIFT)
168#  else /* CONFIG_MMU */
169#  define ARCH_PFN_OFFSET	(memory_start >> PAGE_SHIFT)
170#  define pfn_valid(pfn)	((pfn) < (max_mapnr + ARCH_PFN_OFFSET))
171#  endif /* CONFIG_MMU */
172
173# endif /* __ASSEMBLY__ */
174
175#define	virt_addr_valid(vaddr)	(pfn_valid(virt_to_pfn(vaddr)))
176
177# define __pa(x)	__virt_to_phys((unsigned long)(x))
178# define __va(x)	((void *)__phys_to_virt((unsigned long)(x)))
179
180/* Convert between virtual and physical address for MMU. */
181/* Handle MicroBlaze processor with virtual memory. */
182#ifndef CONFIG_MMU
183#define __virt_to_phys(addr)	addr
184#define __phys_to_virt(addr)	addr
185#define tophys(rd, rs)	addik rd, rs, 0
186#define tovirt(rd, rs)	addik rd, rs, 0
187#else
188#define __virt_to_phys(addr) \
189	((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
190#define __phys_to_virt(addr) \
191	((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
192#define tophys(rd, rs) \
193	addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
194#define tovirt(rd, rs) \
195	addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
196#endif /* CONFIG_MMU */
197
198#define TOPHYS(addr)  __virt_to_phys(addr)
199
200#ifdef CONFIG_MMU
201
202#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
203				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
204#endif /* CONFIG_MMU */
205
206#endif /* __KERNEL__ */
207
208#include <asm-generic/memory_model.h>
209#include <asm-generic/getorder.h>
210
211#endif /* _ASM_MICROBLAZE_PAGE_H */
212