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