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Linux kernel mirror (for testing)
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linux
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 12
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/* MS be sure that SLAB allocates aligned objects */
34#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
35
36#define ARCH_SLAB_MINALIGN L1_CACHE_BYTES
37
38/*
39 * PAGE_OFFSET -- the first address of the first page of memory. With MMU
40 * it is set to the kernel start address (aligned on a page boundary).
41 *
42 * CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used
43 * in arch/microblaze/Makefile.
44 */
45#define PAGE_OFFSET CONFIG_KERNEL_START
46
47/*
48 * The basic type of a PTE - 32 bit physical addressing.
49 */
50typedef unsigned long pte_basic_t;
51#define PTE_FMT "%.8lx"
52
53# define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
54# define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE)
55
56# define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE)
57# define copy_user_page(vto, vfrom, vaddr, topg) \
58 memcpy((vto), (vfrom), PAGE_SIZE)
59
60/*
61 * These are used to make use of C type-checking..
62 */
63typedef struct page *pgtable_t;
64typedef struct { unsigned long pte; } pte_t;
65typedef struct { unsigned long pgprot; } pgprot_t;
66/* FIXME this can depend on linux kernel version */
67typedef struct { unsigned long pgd; } pgd_t;
68
69# define pte_val(x) ((x).pte)
70# define pgprot_val(x) ((x).pgprot)
71
72# define pgd_val(x) ((x).pgd)
73
74# define __pte(x) ((pte_t) { (x) })
75# define __pgd(x) ((pgd_t) { (x) })
76# define __pgprot(x) ((pgprot_t) { (x) })
77
78/**
79 * Conversions for virtual address, physical address, pfn, and struct
80 * page are defined in the following files.
81 *
82 * virt -+
83 * | asm-microblaze/page.h
84 * phys -+
85 * | linux/pfn.h
86 * pfn -+
87 * | asm-generic/memory_model.h
88 * page -+
89 *
90 */
91
92extern unsigned long max_low_pfn;
93extern unsigned long min_low_pfn;
94extern unsigned long max_pfn;
95
96extern unsigned long memory_start;
97extern unsigned long memory_size;
98extern unsigned long lowmem_size;
99
100extern unsigned long kernel_tlb;
101
102extern int page_is_ram(unsigned long pfn);
103
104# define phys_to_pfn(phys) (PFN_DOWN(phys))
105# define pfn_to_phys(pfn) (PFN_PHYS(pfn))
106
107# define virt_to_pfn(vaddr) (phys_to_pfn((__pa(vaddr))))
108# define pfn_to_virt(pfn) __va(pfn_to_phys((pfn)))
109
110# define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
111# define page_to_virt(page) __va(page_to_pfn(page) << PAGE_SHIFT)
112# define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
113
114# define ARCH_PFN_OFFSET (memory_start >> PAGE_SHIFT)
115# define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < (max_mapnr + ARCH_PFN_OFFSET))
116# endif /* __ASSEMBLY__ */
117
118#define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr)))
119
120# define __pa(x) __virt_to_phys((unsigned long)(x))
121# define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
122
123/* Convert between virtual and physical address for MMU. */
124/* Handle MicroBlaze processor with virtual memory. */
125#define __virt_to_phys(addr) \
126 ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
127#define __phys_to_virt(addr) \
128 ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
129#define tophys(rd, rs) \
130 addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
131#define tovirt(rd, rs) \
132 addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
133
134#define TOPHYS(addr) __virt_to_phys(addr)
135
136#endif /* __KERNEL__ */
137
138#include <asm-generic/memory_model.h>
139#include <asm-generic/getorder.h>
140
141#endif /* _ASM_MICROBLAZE_PAGE_H */