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.
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
15 #ifndef _ASM_MICROBLAZE_PAGE_H
16 #define _ASM_MICROBLAZE_PAGE_H
18 #include <linux/pfn.h>
19 #include <asm/setup.h>
20 #include <asm/asm-compat.h>
21 #include <linux/const.h>
25 /* PAGE_SHIFT determines the page size */
26 #define PAGE_SHIFT (12)
27 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
28 #define PAGE_MASK (~(PAGE_SIZE-1))
30 #define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR))
34 #define PAGE_UP(addr) (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
35 #define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1)))
37 /* align addr on a size boundary - adjust address up/down if needed */
38 #define _ALIGN_UP(addr, size) (((addr)+((size)-1))&(~((size)-1)))
39 #define _ALIGN_DOWN(addr, size) ((addr)&(~((size)-1)))
41 /* align addr on a size boundary - adjust address up if needed */
42 #define _ALIGN(addr, size) _ALIGN_UP(addr, size)
46 * PAGE_OFFSET -- the first address of the first page of memory. When not
47 * using MMU this corresponds to the first free page in physical memory (aligned
48 * on a page boundary).
50 extern unsigned int __page_offset;
51 #define PAGE_OFFSET __page_offset
53 #else /* CONFIG_MMU */
56 * PAGE_OFFSET -- the first address of the first page of memory. With MMU
57 * it is set to the kernel start address (aligned on a page boundary).
59 * CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used
60 * in arch/microblaze/Makefile.
62 #define PAGE_OFFSET CONFIG_KERNEL_START
65 * The basic type of a PTE - 32 bit physical addressing.
67 typedef unsigned long pte_basic_t;
68 #define PTE_SHIFT (PAGE_SHIFT - 2) /* 1024 ptes per page */
69 #define PTE_FMT "%.8lx"
71 #endif /* CONFIG_MMU */
74 # define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
75 # define get_user_page(vaddr) __get_free_page(GFP_KERNEL)
76 # define free_user_page(page, addr) free_page(addr)
77 # else /* CONFIG_MMU */
78 extern void copy_page(void *to, void *from);
79 # endif /* CONFIG_MMU */
81 # define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE)
83 # define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE)
84 # define copy_user_page(vto, vfrom, vaddr, topg) \
85 memcpy((vto), (vfrom), PAGE_SIZE)
88 * These are used to make use of C type-checking..
90 typedef struct page *pgtable_t;
91 typedef struct { unsigned long pte; } pte_t;
92 typedef struct { unsigned long pgprot; } pgprot_t;
93 /* FIXME this can depend on linux kernel version */
95 typedef struct { unsigned long pmd; } pmd_t;
96 typedef struct { unsigned long pgd; } pgd_t;
97 # else /* CONFIG_MMU */
98 typedef struct { unsigned long ste[64]; } pmd_t;
99 typedef struct { pmd_t pue[1]; } pud_t;
100 typedef struct { pud_t pge[1]; } pgd_t;
101 # endif /* CONFIG_MMU */
103 # define pte_val(x) ((x).pte)
104 # define pgprot_val(x) ((x).pgprot)
107 # define pmd_val(x) ((x).pmd)
108 # define pgd_val(x) ((x).pgd)
109 # else /* CONFIG_MMU */
110 # define pmd_val(x) ((x).ste[0])
111 # define pud_val(x) ((x).pue[0])
112 # define pgd_val(x) ((x).pge[0])
113 # endif /* CONFIG_MMU */
115 # define __pte(x) ((pte_t) { (x) })
116 # define __pmd(x) ((pmd_t) { (x) })
117 # define __pgd(x) ((pgd_t) { (x) })
118 # define __pgprot(x) ((pgprot_t) { (x) })
121 * Conversions for virtual address, physical address, pfn, and struct
122 * page are defined in the following files.
125 * | asm-microblaze/page.h
129 * | asm-generic/memory_model.h
134 extern unsigned long max_low_pfn;
135 extern unsigned long min_low_pfn;
136 extern unsigned long max_pfn;
138 extern unsigned long memory_start;
139 extern unsigned long memory_end;
140 extern unsigned long memory_size;
142 extern int page_is_ram(unsigned long pfn);
144 # define phys_to_pfn(phys) (PFN_DOWN(phys))
145 # define pfn_to_phys(pfn) (PFN_PHYS(pfn))
147 # define virt_to_pfn(vaddr) (phys_to_pfn((__pa(vaddr))))
148 # define pfn_to_virt(pfn) __va(pfn_to_phys((pfn)))
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)
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 */
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 # define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
172 # endif /* CONFIG_MMU */
174 # endif /* __ASSEMBLY__ */
176 #define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr)))
180 # define __pa(vaddr) ((unsigned long) (vaddr))
181 # define __va(paddr) ((void *) (paddr))
182 # else /* CONFIG_MMU */
183 # define __pa(x) __virt_to_phys((unsigned long)(x))
184 # define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
185 # endif /* CONFIG_MMU */
188 /* Convert between virtual and physical address for MMU. */
189 /* Handle MicroBlaze processor with virtual memory. */
191 #define __virt_to_phys(addr) addr
192 #define __phys_to_virt(addr) addr
193 #define tophys(rd, rs) addik rd, rs, 0
194 #define tovirt(rd, rs) addik rd, rs, 0
196 #define __virt_to_phys(addr) \
197 ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
198 #define __phys_to_virt(addr) \
199 ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
200 #define tophys(rd, rs) \
201 addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
202 #define tovirt(rd, rs) \
203 addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
204 #endif /* CONFIG_MMU */
206 #define TOPHYS(addr) __virt_to_phys(addr)
209 #ifdef CONFIG_CONTIGUOUS_PAGE_ALLOC
210 #define WANT_PAGE_VIRTUAL 1 /* page alloc 2 relies on this */
213 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
214 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
215 #endif /* CONFIG_MMU */
217 #endif /* __KERNEL__ */
219 #include <asm-generic/memory_model.h>
220 #include <asm-generic/getorder.h>
222 #endif /* _ASM_MICROBLAZE_PAGE_H */