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#if defined(CONFIG_MICROBLAZE_64K_PAGES)
24#define PAGE_SHIFT		16
25#elif defined(CONFIG_MICROBLAZE_16K_PAGES)
26#define PAGE_SHIFT		14
27#else
28#define PAGE_SHIFT		12
29#endif
30#define PAGE_SIZE	(ASM_CONST(1) << PAGE_SHIFT)
31#define PAGE_MASK	(~(PAGE_SIZE-1))
32
33#define LOAD_OFFSET	ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR))
34
35#define PTE_SHIFT	(PAGE_SHIFT - 2)	/* 1024 ptes per page */
36
37#ifndef __ASSEMBLY__
38
39/* MS be sure that SLAB allocates aligned objects */
40#define ARCH_DMA_MINALIGN	L1_CACHE_BYTES
41
42#define ARCH_SLAB_MINALIGN	L1_CACHE_BYTES
43
44#define PAGE_UP(addr)	(((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
45#define PAGE_DOWN(addr)	((addr)&(~((PAGE_SIZE)-1)))
46
47#ifndef CONFIG_MMU
48/*
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).
52 */
53extern unsigned int __page_offset;
54#define PAGE_OFFSET __page_offset
55
56#else /* CONFIG_MMU */
57
58/*
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).
61 *
62 * CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used
63 * in arch/microblaze/Makefile.
64 */
65#define PAGE_OFFSET	CONFIG_KERNEL_START
66
67/*
68 * The basic type of a PTE - 32 bit physical addressing.
69 */
70typedef unsigned long pte_basic_t;
71#define PTE_FMT		"%.8lx"
72
73#endif /* CONFIG_MMU */
74
75# define copy_page(to, from)			memcpy((to), (from), PAGE_SIZE)
76# define clear_page(pgaddr)			memset((pgaddr), 0, PAGE_SIZE)
77
78# define clear_user_page(pgaddr, vaddr, page)	memset((pgaddr), 0, PAGE_SIZE)
79# define copy_user_page(vto, vfrom, vaddr, topg) \
80			memcpy((vto), (vfrom), PAGE_SIZE)
81
82/*
83 * These are used to make use of C type-checking..
84 */
85typedef struct page *pgtable_t;
86typedef struct { unsigned long	pte; }		pte_t;
87typedef struct { unsigned long	pgprot; }	pgprot_t;
88/* FIXME this can depend on linux kernel version */
89#   ifdef CONFIG_MMU
90typedef struct { unsigned long pgd; } pgd_t;
91#   else /* CONFIG_MMU */
92typedef struct { unsigned long	ste[64]; }	pmd_t;
93typedef struct { pmd_t		pue[1]; }	pud_t;
94typedef struct { pud_t		p4e[1]; }	p4d_t;
95typedef struct { p4d_t		pge[1]; }	pgd_t;
96#   endif /* CONFIG_MMU */
97
98# define pte_val(x)	((x).pte)
99# define pgprot_val(x)	((x).pgprot)
100
101#   ifdef CONFIG_MMU
102#   define pgd_val(x)      ((x).pgd)
103#   else  /* CONFIG_MMU */
104#   define pmd_val(x)	((x).ste[0])
105#   define pud_val(x)	((x).pue[0])
106#   define pgd_val(x)	((x).pge[0])
107#   endif  /* CONFIG_MMU */
108
109# define __pte(x)	((pte_t) { (x) })
110# define __pgd(x)	((pgd_t) { (x) })
111# define __pgprot(x)	((pgprot_t) { (x) })
112
113/**
114 * Conversions for virtual address, physical address, pfn, and struct
115 * page are defined in the following files.
116 *
117 * virt -+
118 *	 | asm-microblaze/page.h
119 * phys -+
120 *	 | linux/pfn.h
121 *  pfn -+
122 *	 | asm-generic/memory_model.h
123 * page -+
124 *
125 */
126
127extern unsigned long max_low_pfn;
128extern unsigned long min_low_pfn;
129extern unsigned long max_pfn;
130
131extern unsigned long memory_start;
132extern unsigned long memory_size;
133extern unsigned long lowmem_size;
134
135extern unsigned long kernel_tlb;
136
137extern int page_is_ram(unsigned long pfn);
138
139# define phys_to_pfn(phys)	(PFN_DOWN(phys))
140# define pfn_to_phys(pfn)	(PFN_PHYS(pfn))
141
142# define virt_to_pfn(vaddr)	(phys_to_pfn((__pa(vaddr))))
143# define pfn_to_virt(pfn)	__va(pfn_to_phys((pfn)))
144
145#  ifdef CONFIG_MMU
146
147#  define virt_to_page(kaddr)	(pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
148#  define page_to_virt(page)   __va(page_to_pfn(page) << PAGE_SHIFT)
149#  define page_to_phys(page)     (page_to_pfn(page) << PAGE_SHIFT)
150
151#  else /* CONFIG_MMU */
152#  define virt_to_page(vaddr)	(pfn_to_page(virt_to_pfn(vaddr)))
153#  define page_to_virt(page)	(pfn_to_virt(page_to_pfn(page)))
154#  define page_to_phys(page)	(pfn_to_phys(page_to_pfn(page)))
155#  define page_to_bus(page)	(page_to_phys(page))
156#  define phys_to_page(paddr)	(pfn_to_page(phys_to_pfn(paddr)))
157#  endif /* CONFIG_MMU */
158
159#  ifndef CONFIG_MMU
160#  define pfn_valid(pfn)	(((pfn) >= min_low_pfn) && \
161				((pfn) <= (min_low_pfn + max_mapnr)))
162#  define ARCH_PFN_OFFSET	(PAGE_OFFSET >> PAGE_SHIFT)
163#  else /* CONFIG_MMU */
164#  define ARCH_PFN_OFFSET	(memory_start >> PAGE_SHIFT)
165#  define pfn_valid(pfn)	((pfn) < (max_mapnr + ARCH_PFN_OFFSET))
166#  endif /* CONFIG_MMU */
167
168# endif /* __ASSEMBLY__ */
169
170#define	virt_addr_valid(vaddr)	(pfn_valid(virt_to_pfn(vaddr)))
171
172# define __pa(x)	__virt_to_phys((unsigned long)(x))
173# define __va(x)	((void *)__phys_to_virt((unsigned long)(x)))
174
175/* Convert between virtual and physical address for MMU. */
176/* Handle MicroBlaze processor with virtual memory. */
177#ifndef CONFIG_MMU
178#define __virt_to_phys(addr)	addr
179#define __phys_to_virt(addr)	addr
180#define tophys(rd, rs)	addik rd, rs, 0
181#define tovirt(rd, rs)	addik rd, rs, 0
182#else
183#define __virt_to_phys(addr) \
184	((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
185#define __phys_to_virt(addr) \
186	((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
187#define tophys(rd, rs) \
188	addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
189#define tovirt(rd, rs) \
190	addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
191#endif /* CONFIG_MMU */
192
193#define TOPHYS(addr)  __virt_to_phys(addr)
194
195#ifdef CONFIG_MMU
196
197#endif /* CONFIG_MMU */
198
199#endif /* __KERNEL__ */
200
201#include <asm-generic/memory_model.h>
202#include <asm-generic/getorder.h>
203
204#endif /* _ASM_MICROBLAZE_PAGE_H */
205