1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * VM ops
4 *
5 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
6 * Copyright (C) 2008-2009 PetaLogix
7 * Copyright (C) 2006 Atmark Techno, Inc.
8 * Changes for MMU support:
9 * Copyright (C) 2007 Xilinx, Inc. All rights reserved.
10 */
11
12 #ifndef _ASM_MICROBLAZE_PAGE_H
13 #define _ASM_MICROBLAZE_PAGE_H
14
15 #include <linux/pfn.h>
16 #include <asm/setup.h>
17 #include <asm/asm-compat.h>
18 #include <linux/const.h>
19
20 #ifdef __KERNEL__
21
22 /* PAGE_SHIFT determines the page size */
23 #define PAGE_SHIFT CONFIG_PAGE_SHIFT
24 #define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT)
25 #define PAGE_MASK (~(PAGE_SIZE-1))
26
27 #define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR))
28
29 #define PTE_SHIFT (PAGE_SHIFT - 2) /* 1024 ptes per page */
30
31 #ifndef __ASSEMBLY__
32
33 /*
34 * PAGE_OFFSET -- the first address of the first page of memory. With MMU
35 * it is set to the kernel start address (aligned on a page boundary).
36 *
37 * CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used
38 * in arch/microblaze/Makefile.
39 */
40 #define PAGE_OFFSET CONFIG_KERNEL_START
41
42 /*
43 * The basic type of a PTE - 32 bit physical addressing.
44 */
45 typedef unsigned long pte_basic_t;
46 #define PTE_FMT "%.8lx"
47
48 # define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
49 # define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE)
50
51 # define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE)
52 # define copy_user_page(vto, vfrom, vaddr, topg) \
53 memcpy((vto), (vfrom), PAGE_SIZE)
54
55 /*
56 * These are used to make use of C type-checking..
57 */
58 typedef struct page *pgtable_t;
59 typedef struct { unsigned long pte; } pte_t;
60 typedef struct { unsigned long pgprot; } pgprot_t;
61 /* FIXME this can depend on linux kernel version */
62 typedef struct { unsigned long pgd; } pgd_t;
63
64 # define pte_val(x) ((x).pte)
65 # define pgprot_val(x) ((x).pgprot)
66
67 # define pgd_val(x) ((x).pgd)
68
69 # define __pte(x) ((pte_t) { (x) })
70 # define __pgd(x) ((pgd_t) { (x) })
71 # define __pgprot(x) ((pgprot_t) { (x) })
72
73 /**
74 * Conversions for virtual address, physical address, pfn, and struct
75 * page are defined in the following files.
76 *
77 * virt -+
78 * | asm-microblaze/page.h
79 * phys -+
80 * | linux/pfn.h
81 * pfn -+
82 * | asm-generic/memory_model.h
83 * page -+
84 *
85 */
86
87 extern unsigned long max_low_pfn;
88 extern unsigned long min_low_pfn;
89 extern unsigned long max_pfn;
90
91 extern unsigned long memory_start;
92 extern unsigned long memory_size;
93 extern unsigned long lowmem_size;
94
95 extern unsigned long kernel_tlb;
96
97 extern int page_is_ram(unsigned long pfn);
98
99 # define phys_to_pfn(phys) (PFN_DOWN(phys))
100 # define pfn_to_phys(pfn) (PFN_PHYS(pfn))
101
102 # define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
103 # define page_to_virt(page) __va(page_to_pfn(page) << PAGE_SHIFT)
104 # define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
105
106 # define ARCH_PFN_OFFSET (memory_start >> PAGE_SHIFT)
107 # endif /* __ASSEMBLY__ */
108
109 /* Convert between virtual and physical address for MMU. */
110 /* Handle MicroBlaze processor with virtual memory. */
111 #define __virt_to_phys(addr) \
112 ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
113 #define __phys_to_virt(addr) \
114 ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
115 #define tophys(rd, rs) \
116 addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
117 #define tovirt(rd, rs) \
118 addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
119
120 #ifndef __ASSEMBLY__
121
122 # define __pa(x) __virt_to_phys((unsigned long)(x))
123 # define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
124
virt_to_pfn(const void * vaddr)125 static inline unsigned long virt_to_pfn(const void *vaddr)
126 {
127 return phys_to_pfn(__pa(vaddr));
128 }
129
pfn_to_virt(unsigned long pfn)130 static inline const void *pfn_to_virt(unsigned long pfn)
131 {
132 return __va(pfn_to_phys((pfn)));
133 }
134
135 #define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr)))
136
137 #endif /* __ASSEMBLY__ */
138
139 #define TOPHYS(addr) __virt_to_phys(addr)
140
141 #endif /* __KERNEL__ */
142
143 #include <asm-generic/memory_model.h>
144 #include <asm-generic/getorder.h>
145
146 #endif /* _ASM_MICROBLAZE_PAGE_H */
147