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 /* MS be sure that SLAB allocates aligned objects */
35 #define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
37 #define PAGE_UP(addr) (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
38 #define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1)))
40 /* align addr on a size boundary - adjust address up/down if needed */
41 #define _ALIGN_UP(addr, size) (((addr)+((size)-1))&(~((size)-1)))
42 #define _ALIGN_DOWN(addr, size) ((addr)&(~((size)-1)))
44 /* align addr on a size boundary - adjust address up if needed */
45 #define _ALIGN(addr, size) _ALIGN_UP(addr, size)
49 * PAGE_OFFSET -- the first address of the first page of memory. When not
50 * using MMU this corresponds to the first free page in physical memory (aligned
51 * on a page boundary).
53 extern unsigned int __page_offset;
54 #define PAGE_OFFSET __page_offset
56 #else /* CONFIG_MMU */
59 * PAGE_OFFSET -- the first address of the first page of memory. With MMU
60 * it is set to the kernel start address (aligned on a page boundary).
62 * CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used
63 * in arch/microblaze/Makefile.
65 #define PAGE_OFFSET CONFIG_KERNEL_START
68 * The basic type of a PTE - 32 bit physical addressing.
70 typedef unsigned long pte_basic_t;
71 #define PTE_SHIFT (PAGE_SHIFT - 2) /* 1024 ptes per page */
72 #define PTE_FMT "%.8lx"
74 #endif /* CONFIG_MMU */
76 # define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
77 # define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE)
79 # define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE)
80 # define copy_user_page(vto, vfrom, vaddr, topg) \
81 memcpy((vto), (vfrom), PAGE_SIZE)
84 * These are used to make use of C type-checking..
86 typedef struct page *pgtable_t;
87 typedef struct { unsigned long pte; } pte_t;
88 typedef struct { unsigned long pgprot; } pgprot_t;
89 /* FIXME this can depend on linux kernel version */
91 typedef struct { unsigned long pmd; } pmd_t;
92 typedef struct { unsigned long pgd; } pgd_t;
93 # else /* CONFIG_MMU */
94 typedef struct { unsigned long ste[64]; } pmd_t;
95 typedef struct { pmd_t pue[1]; } pud_t;
96 typedef struct { pud_t pge[1]; } pgd_t;
97 # endif /* CONFIG_MMU */
99 # define pte_val(x) ((x).pte)
100 # define pgprot_val(x) ((x).pgprot)
103 # define pmd_val(x) ((x).pmd)
104 # define pgd_val(x) ((x).pgd)
105 # else /* CONFIG_MMU */
106 # define pmd_val(x) ((x).ste[0])
107 # define pud_val(x) ((x).pue[0])
108 # define pgd_val(x) ((x).pge[0])
109 # endif /* CONFIG_MMU */
111 # define __pte(x) ((pte_t) { (x) })
112 # define __pmd(x) ((pmd_t) { (x) })
113 # define __pgd(x) ((pgd_t) { (x) })
114 # define __pgprot(x) ((pgprot_t) { (x) })
117 * Conversions for virtual address, physical address, pfn, and struct
118 * page are defined in the following files.
121 * | asm-microblaze/page.h
125 * | asm-generic/memory_model.h
130 extern unsigned long max_low_pfn;
131 extern unsigned long min_low_pfn;
132 extern unsigned long max_pfn;
134 extern unsigned long memory_start;
135 extern unsigned long memory_end;
136 extern unsigned long memory_size;
138 extern int page_is_ram(unsigned long pfn);
140 # define phys_to_pfn(phys) (PFN_DOWN(phys))
141 # define pfn_to_phys(pfn) (PFN_PHYS(pfn))
143 # define virt_to_pfn(vaddr) (phys_to_pfn((__pa(vaddr))))
144 # define pfn_to_virt(pfn) __va(pfn_to_phys((pfn)))
148 # define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
149 # define page_to_virt(page) __va(page_to_pfn(page) << PAGE_SHIFT)
150 # define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
152 # else /* CONFIG_MMU */
153 # define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
154 # define page_to_virt(page) (pfn_to_virt(page_to_pfn(page)))
155 # define page_to_phys(page) (pfn_to_phys(page_to_pfn(page)))
156 # define page_to_bus(page) (page_to_phys(page))
157 # define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr)))
158 # endif /* CONFIG_MMU */
161 # define pfn_valid(pfn) (((pfn) >= min_low_pfn) && \
162 ((pfn) <= (min_low_pfn + max_mapnr)))
163 # define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
164 # else /* CONFIG_MMU */
165 # define ARCH_PFN_OFFSET (memory_start >> PAGE_SHIFT)
166 # define pfn_valid(pfn) ((pfn) < (max_mapnr + ARCH_PFN_OFFSET))
167 # define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
168 # endif /* CONFIG_MMU */
170 # endif /* __ASSEMBLY__ */
172 #define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr)))
176 # define __pa(vaddr) ((unsigned long) (vaddr))
177 # define __va(paddr) ((void *) (paddr))
178 # else /* CONFIG_MMU */
179 # define __pa(x) __virt_to_phys((unsigned long)(x))
180 # define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
181 # endif /* CONFIG_MMU */
184 /* Convert between virtual and physical address for MMU. */
185 /* Handle MicroBlaze processor with virtual memory. */
187 #define __virt_to_phys(addr) addr
188 #define __phys_to_virt(addr) addr
189 #define tophys(rd, rs) addik rd, rs, 0
190 #define tovirt(rd, rs) addik rd, rs, 0
192 #define __virt_to_phys(addr) \
193 ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
194 #define __phys_to_virt(addr) \
195 ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
196 #define tophys(rd, rs) \
197 addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
198 #define tovirt(rd, rs) \
199 addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
200 #endif /* CONFIG_MMU */
202 #define TOPHYS(addr) __virt_to_phys(addr)
205 #ifdef CONFIG_CONTIGUOUS_PAGE_ALLOC
206 #define WANT_PAGE_VIRTUAL 1 /* page alloc 2 relies on this */
209 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
210 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
211 #endif /* CONFIG_MMU */
213 #endif /* __KERNEL__ */
215 #include <asm-generic/memory_model.h>
216 #include <asm-generic/getorder.h>
218 #endif /* _ASM_MICROBLAZE_PAGE_H */