tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2008 Michal Simek
3 * Copyright (C) 2008 PetaLogix
4 * Copyright (C) 2006 Atmark Techno, Inc.
5 * Changes for MMU support:
6 * Copyright (C) 2007 Xilinx, Inc. All rights reserved.
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file "COPYING" in the main directory of this archive
10 * for more details.
11 */
12
13#ifndef _ASM_MICROBLAZE_PAGE_H
14#define _ASM_MICROBLAZE_PAGE_H
15
16#include <linux/pfn.h>
17#include <asm/setup.h>
18
19/* PAGE_SHIFT determines the page size */
20#define PAGE_SHIFT (12)
21#define PAGE_SIZE (1UL << PAGE_SHIFT)
22#define PAGE_MASK (~(PAGE_SIZE-1))
23
24#ifdef __KERNEL__
25
26#ifndef __ASSEMBLY__
27
28#define PAGE_UP(addr) (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
29#define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1)))
30
31/* align addr on a size boundary - adjust address up/down if needed */
32#define _ALIGN_UP(addr, size) (((addr)+((size)-1))&(~((size)-1)))
33#define _ALIGN_DOWN(addr, size) ((addr)&(~((size)-1)))
34
35/* align addr on a size boundary - adjust address up if needed */
36#define _ALIGN(addr, size) _ALIGN_UP(addr, size)
37
38/*
39 * PAGE_OFFSET -- the first address of the first page of memory. When not
40 * using MMU this corresponds to the first free page in physical memory (aligned
41 * on a page boundary).
42 */
43extern unsigned int __page_offset;
44#define PAGE_OFFSET __page_offset
45
46#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
47#define get_user_page(vaddr) __get_free_page(GFP_KERNEL)
48#define free_user_page(page, addr) free_page(addr)
49
50#define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE)
51
52
53#define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE)
54#define copy_user_page(vto, vfrom, vaddr, topg) \
55 memcpy((vto), (vfrom), PAGE_SIZE)
56
57/*
58 * These are used to make use of C type-checking..
59 */
60typedef struct page *pgtable_t;
61typedef struct { unsigned long pte; } pte_t;
62typedef struct { unsigned long pgprot; } pgprot_t;
63typedef struct { unsigned long ste[64]; } pmd_t;
64typedef struct { pmd_t pue[1]; } pud_t;
65typedef struct { pud_t pge[1]; } pgd_t;
66
67
68#define pte_val(x) ((x).pte)
69#define pgprot_val(x) ((x).pgprot)
70#define pmd_val(x) ((x).ste[0])
71#define pud_val(x) ((x).pue[0])
72#define pgd_val(x) ((x).pge[0])
73
74#define __pte(x) ((pte_t) { (x) })
75#define __pmd(x) ((pmd_t) { (x) })
76#define __pgd(x) ((pgd_t) { (x) })
77#define __pgprot(x) ((pgprot_t) { (x) })
78
79/**
80 * Conversions for virtual address, physical address, pfn, and struct
81 * page are defined in the following files.
82 *
83 * virt -+
84 * | asm-microblaze/page.h
85 * phys -+
86 * | linux/pfn.h
87 * pfn -+
88 * | asm-generic/memory_model.h
89 * page -+
90 *
91 */
92
93extern unsigned long max_low_pfn;
94extern unsigned long min_low_pfn;
95extern unsigned long max_pfn;
96
97#define __pa(vaddr) ((unsigned long) (vaddr))
98#define __va(paddr) ((void *) (paddr))
99
100#define phys_to_pfn(phys) (PFN_DOWN(phys))
101#define pfn_to_phys(pfn) (PFN_PHYS(pfn))
102
103#define virt_to_pfn(vaddr) (phys_to_pfn((__pa(vaddr))))
104#define pfn_to_virt(pfn) __va(pfn_to_phys((pfn)))
105
106#define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
107#define page_to_virt(page) (pfn_to_virt(page_to_pfn(page)))
108
109#define page_to_phys(page) (pfn_to_phys(page_to_pfn(page)))
110#define page_to_bus(page) (page_to_phys(page))
111#define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr)))
112
113extern unsigned int memory_start;
114extern unsigned int memory_end;
115extern unsigned int memory_size;
116
117#define pfn_valid(pfn) ((pfn) >= min_low_pfn && (pfn) < max_mapnr)
118
119#define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
120
121#else
122#define tophys(rd, rs) (addik rd, rs, 0)
123#define tovirt(rd, rs) (addik rd, rs, 0)
124#endif /* __ASSEMBLY__ */
125
126#define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr)))
127
128/* Convert between virtual and physical address for MMU. */
129/* Handle MicroBlaze processor with virtual memory. */
130#define __virt_to_phys(addr) addr
131#define __phys_to_virt(addr) addr
132
133#define TOPHYS(addr) __virt_to_phys(addr)
134
135#endif /* __KERNEL__ */
136
137#include <asm-generic/memory_model.h>
138#include <asm-generic/page.h>
139
140#endif /* _ASM_MICROBLAZE_PAGE_H */