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 #if defined(CONFIG_MICROBLAZE_32K_PAGES)
28 #elif defined(CONFIG_MICROBLAZE_16K_PAGES)
30 #elif defined(CONFIG_MICROBLAZE_8K_PAGES)
35 #define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT)
36 #define PAGE_MASK (~(PAGE_SIZE-1))
38 #define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR))
42 /* MS be sure that SLAB allocates aligned objects */
43 #define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
45 #define ARCH_SLAB_MINALIGN L1_CACHE_BYTES
47 #define PAGE_UP(addr) (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
48 #define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1)))
50 /* align addr on a size boundary - adjust address up/down if needed */
51 #define _ALIGN_UP(addr, size) (((addr)+((size)-1))&(~((size)-1)))
52 #define _ALIGN_DOWN(addr, size) ((addr)&(~((size)-1)))
54 /* align addr on a size boundary - adjust address up if needed */
55 #define _ALIGN(addr, size) _ALIGN_UP(addr, size)
59 * PAGE_OFFSET -- the first address of the first page of memory. When not
60 * using MMU this corresponds to the first free page in physical memory (aligned
61 * on a page boundary).
63 extern unsigned int __page_offset;
64 #define PAGE_OFFSET __page_offset
66 #else /* CONFIG_MMU */
69 * PAGE_OFFSET -- the first address of the first page of memory. With MMU
70 * it is set to the kernel start address (aligned on a page boundary).
72 * CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used
73 * in arch/microblaze/Makefile.
75 #define PAGE_OFFSET CONFIG_KERNEL_START
78 * The basic type of a PTE - 32 bit physical addressing.
80 typedef unsigned long pte_basic_t;
81 #define PTE_SHIFT (PAGE_SHIFT - 2) /* 1024 ptes per page */
82 #define PTE_FMT "%.8lx"
84 #endif /* CONFIG_MMU */
86 # define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
87 # define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE)
89 # define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE)
90 # define copy_user_page(vto, vfrom, vaddr, topg) \
91 memcpy((vto), (vfrom), PAGE_SIZE)
94 * These are used to make use of C type-checking..
96 typedef struct page *pgtable_t;
97 typedef struct { unsigned long pte; } pte_t;
98 typedef struct { unsigned long pgprot; } pgprot_t;
99 /* FIXME this can depend on linux kernel version */
101 typedef struct { unsigned long pmd; } pmd_t;
102 typedef struct { unsigned long pgd; } pgd_t;
103 # else /* CONFIG_MMU */
104 typedef struct { unsigned long ste[64]; } pmd_t;
105 typedef struct { pmd_t pue[1]; } pud_t;
106 typedef struct { pud_t pge[1]; } pgd_t;
107 # endif /* CONFIG_MMU */
109 # define pte_val(x) ((x).pte)
110 # define pgprot_val(x) ((x).pgprot)
113 # define pmd_val(x) ((x).pmd)
114 # define pgd_val(x) ((x).pgd)
115 # else /* CONFIG_MMU */
116 # define pmd_val(x) ((x).ste[0])
117 # define pud_val(x) ((x).pue[0])
118 # define pgd_val(x) ((x).pge[0])
119 # endif /* CONFIG_MMU */
121 # define __pte(x) ((pte_t) { (x) })
122 # define __pmd(x) ((pmd_t) { (x) })
123 # define __pgd(x) ((pgd_t) { (x) })
124 # define __pgprot(x) ((pgprot_t) { (x) })
127 * Conversions for virtual address, physical address, pfn, and struct
128 * page are defined in the following files.
131 * | asm-microblaze/page.h
135 * | asm-generic/memory_model.h
140 extern unsigned long max_low_pfn;
141 extern unsigned long min_low_pfn;
142 extern unsigned long max_pfn;
144 extern unsigned long memory_start;
145 extern unsigned long memory_end;
146 extern unsigned long memory_size;
148 extern int page_is_ram(unsigned long pfn);
150 # define phys_to_pfn(phys) (PFN_DOWN(phys))
151 # define pfn_to_phys(pfn) (PFN_PHYS(pfn))
153 # define virt_to_pfn(vaddr) (phys_to_pfn((__pa(vaddr))))
154 # define pfn_to_virt(pfn) __va(pfn_to_phys((pfn)))
158 # define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
159 # define page_to_virt(page) __va(page_to_pfn(page) << PAGE_SHIFT)
160 # define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
162 # else /* CONFIG_MMU */
163 # define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
164 # define page_to_virt(page) (pfn_to_virt(page_to_pfn(page)))
165 # define page_to_phys(page) (pfn_to_phys(page_to_pfn(page)))
166 # define page_to_bus(page) (page_to_phys(page))
167 # define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr)))
168 # endif /* CONFIG_MMU */
171 # define pfn_valid(pfn) (((pfn) >= min_low_pfn) && \
172 ((pfn) <= (min_low_pfn + max_mapnr)))
173 # define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
174 # else /* CONFIG_MMU */
175 # define ARCH_PFN_OFFSET (memory_start >> PAGE_SHIFT)
176 # define pfn_valid(pfn) ((pfn) < (max_mapnr + ARCH_PFN_OFFSET))
177 # define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
178 # endif /* CONFIG_MMU */
180 # endif /* __ASSEMBLY__ */
182 #define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr)))
186 # define __pa(vaddr) ((unsigned long) (vaddr))
187 # define __va(paddr) ((void *) (paddr))
188 # else /* CONFIG_MMU */
189 # define __pa(x) __virt_to_phys((unsigned long)(x))
190 # define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
191 # endif /* CONFIG_MMU */
194 /* Convert between virtual and physical address for MMU. */
195 /* Handle MicroBlaze processor with virtual memory. */
197 #define __virt_to_phys(addr) addr
198 #define __phys_to_virt(addr) addr
199 #define tophys(rd, rs) addik rd, rs, 0
200 #define tovirt(rd, rs) addik rd, rs, 0
202 #define __virt_to_phys(addr) \
203 ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
204 #define __phys_to_virt(addr) \
205 ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
206 #define tophys(rd, rs) \
207 addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
208 #define tovirt(rd, rs) \
209 addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
210 #endif /* CONFIG_MMU */
212 #define TOPHYS(addr) __virt_to_phys(addr)
215 #ifdef CONFIG_CONTIGUOUS_PAGE_ALLOC
216 #define WANT_PAGE_VIRTUAL 1 /* page alloc 2 relies on this */
219 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
220 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
221 #endif /* CONFIG_MMU */
223 #endif /* __KERNEL__ */
225 #include <asm-generic/memory_model.h>
226 #include <asm-generic/getorder.h>
228 #endif /* _ASM_MICROBLAZE_PAGE_H */