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 */
45typedef 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 */
58typedef struct page *pgtable_t;
59typedef struct { unsigned long	pte; }		pte_t;
60typedef struct { unsigned long	pgprot; }	pgprot_t;
61/* FIXME this can depend on linux kernel version */
62typedef 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
87extern unsigned long max_low_pfn;
88extern unsigned long min_low_pfn;
89extern unsigned long max_pfn;
90
91extern unsigned long memory_start;
92extern unsigned long memory_size;
93extern unsigned long lowmem_size;
94
95extern unsigned long kernel_tlb;
96
97extern 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
125static inline unsigned long virt_to_pfn(const void *vaddr)
126{
127	return phys_to_pfn(__pa(vaddr));
128}
129
130static 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