tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef __ASM_SH_PAGE_H
2#define __ASM_SH_PAGE_H
3
4/*
5 * Copyright (C) 1999 Niibe Yutaka
6 */
7
8/*
9 [ P0/U0 (virtual) ] 0x00000000 <------ User space
10 [ P1 (fixed) cached ] 0x80000000 <------ Kernel space
11 [ P2 (fixed) non-cachable] 0xA0000000 <------ Physical access
12 [ P3 (virtual) cached] 0xC0000000 <------ vmalloced area
13 [ P4 control ] 0xE0000000
14 */
15
16#ifdef __KERNEL__
17
18/* PAGE_SHIFT determines the page size */
19#if defined(CONFIG_PAGE_SIZE_4KB)
20# define PAGE_SHIFT 12
21#elif defined(CONFIG_PAGE_SIZE_8KB)
22# define PAGE_SHIFT 13
23#elif defined(CONFIG_PAGE_SIZE_64KB)
24# define PAGE_SHIFT 16
25#else
26# error "Bogus kernel page size?"
27#endif
28
29#ifdef __ASSEMBLY__
30#define PAGE_SIZE (1 << PAGE_SHIFT)
31#else
32#define PAGE_SIZE (1UL << PAGE_SHIFT)
33#endif
34
35#define PAGE_MASK (~(PAGE_SIZE-1))
36#define PTE_MASK PAGE_MASK
37
38#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
39#define HPAGE_SHIFT 16
40#elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
41#define HPAGE_SHIFT 18
42#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
43#define HPAGE_SHIFT 20
44#elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
45#define HPAGE_SHIFT 22
46#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
47#define HPAGE_SHIFT 26
48#endif
49
50#ifdef CONFIG_HUGETLB_PAGE
51#define HPAGE_SIZE (1UL << HPAGE_SHIFT)
52#define HPAGE_MASK (~(HPAGE_SIZE-1))
53#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT)
54#endif
55
56#ifndef __ASSEMBLY__
57
58extern void (*clear_page)(void *to);
59extern void (*copy_page)(void *to, void *from);
60
61extern unsigned long shm_align_mask;
62
63#ifdef CONFIG_MMU
64extern void clear_page_slow(void *to);
65extern void copy_page_slow(void *to, void *from);
66#else
67extern void clear_page_nommu(void *to);
68extern void copy_page_nommu(void *to, void *from);
69#endif
70
71#if defined(CONFIG_MMU) && (defined(CONFIG_CPU_SH4) || \
72 defined(CONFIG_SH7705_CACHE_32KB))
73struct page;
74extern void clear_user_page(void *to, unsigned long address, struct page *pg);
75extern void copy_user_page(void *to, void *from, unsigned long address, struct page *pg);
76extern void __clear_user_page(void *to, void *orig_to);
77extern void __copy_user_page(void *to, void *from, void *orig_to);
78#elif defined(CONFIG_CPU_SH2) || defined(CONFIG_CPU_SH3) || !defined(CONFIG_MMU)
79#define clear_user_page(page, vaddr, pg) clear_page(page)
80#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
81#endif
82
83/*
84 * These are used to make use of C type-checking..
85 */
86#ifdef CONFIG_X2TLB
87typedef struct { unsigned long pte_low, pte_high; } pte_t;
88typedef struct { unsigned long long pgprot; } pgprot_t;
89#define pte_val(x) \
90 ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
91#define __pte(x) \
92 ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
93#else
94typedef struct { unsigned long pte_low; } pte_t;
95typedef struct { unsigned long pgprot; } pgprot_t;
96#define pte_val(x) ((x).pte_low)
97#define __pte(x) ((pte_t) { (x) } )
98#endif
99
100typedef struct { unsigned long pgd; } pgd_t;
101
102#define pgd_val(x) ((x).pgd)
103#define pgprot_val(x) ((x).pgprot)
104
105#define __pgd(x) ((pgd_t) { (x) } )
106#define __pgprot(x) ((pgprot_t) { (x) } )
107
108#endif /* !__ASSEMBLY__ */
109
110/* to align the pointer to the (next) page boundary */
111#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
112
113/*
114 * IF YOU CHANGE THIS, PLEASE ALSO CHANGE
115 *
116 * arch/sh/kernel/vmlinux.lds.S
117 *
118 * which has the same constant encoded..
119 */
120
121#define __MEMORY_START CONFIG_MEMORY_START
122#define __MEMORY_SIZE CONFIG_MEMORY_SIZE
123
124#define PAGE_OFFSET CONFIG_PAGE_OFFSET
125#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
126#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
127
128#define MAP_NR(addr) (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT)
129
130#define phys_to_page(phys) (mem_map + (((phys)-__MEMORY_START) >> PAGE_SHIFT))
131#define page_to_phys(page) (((page - mem_map) << PAGE_SHIFT) + __MEMORY_START)
132
133/* PFN start number, because of __MEMORY_START */
134#define PFN_START (__MEMORY_START >> PAGE_SHIFT)
135#define ARCH_PFN_OFFSET (PFN_START)
136#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
137#define pfn_valid(pfn) (((pfn) - PFN_START) < max_mapnr)
138#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
139
140#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
141 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
142
143#include <asm-generic/memory_model.h>
144#include <asm-generic/page.h>
145
146/* vDSO support */
147#ifdef CONFIG_VSYSCALL
148#define __HAVE_ARCH_GATE_AREA
149#endif
150
151#endif /* __KERNEL__ */
152#endif /* __ASM_SH_PAGE_H */