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;
62extern unsigned long max_low_pfn, min_low_pfn;
63extern unsigned long memory_start, memory_end;
64
65#ifdef CONFIG_MMU
66extern void clear_page_slow(void *to);
67extern void copy_page_slow(void *to, void *from);
68#else
69extern void clear_page_nommu(void *to);
70extern void copy_page_nommu(void *to, void *from);
71#endif
72
73#if defined(CONFIG_MMU) && (defined(CONFIG_CPU_SH4) || \
74 defined(CONFIG_SH7705_CACHE_32KB))
75struct page;
76extern void clear_user_page(void *to, unsigned long address, struct page *pg);
77extern void copy_user_page(void *to, void *from, unsigned long address, struct page *pg);
78extern void __clear_user_page(void *to, void *orig_to);
79extern void __copy_user_page(void *to, void *from, void *orig_to);
80#elif defined(CONFIG_CPU_SH2) || defined(CONFIG_CPU_SH3) || !defined(CONFIG_MMU)
81#define clear_user_page(page, vaddr, pg) clear_page(page)
82#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
83#endif
84
85/*
86 * These are used to make use of C type-checking..
87 */
88#ifdef CONFIG_X2TLB
89typedef struct { unsigned long pte_low, pte_high; } pte_t;
90typedef struct { unsigned long long pgprot; } pgprot_t;
91#define pte_val(x) \
92 ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
93#define __pte(x) \
94 ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
95#else
96typedef struct { unsigned long pte_low; } pte_t;
97typedef struct { unsigned long pgprot; } pgprot_t;
98#define pte_val(x) ((x).pte_low)
99#define __pte(x) ((pte_t) { (x) } )
100#endif
101
102typedef struct { unsigned long pgd; } pgd_t;
103
104#define pgd_val(x) ((x).pgd)
105#define pgprot_val(x) ((x).pgprot)
106
107#define __pgd(x) ((pgd_t) { (x) } )
108#define __pgprot(x) ((pgprot_t) { (x) } )
109
110#endif /* !__ASSEMBLY__ */
111
112/* to align the pointer to the (next) page boundary */
113#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
114
115/*
116 * IF YOU CHANGE THIS, PLEASE ALSO CHANGE
117 *
118 * arch/sh/kernel/vmlinux.lds.S
119 *
120 * which has the same constant encoded..
121 */
122
123#define __MEMORY_START CONFIG_MEMORY_START
124#define __MEMORY_SIZE CONFIG_MEMORY_SIZE
125
126#define PAGE_OFFSET CONFIG_PAGE_OFFSET
127#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
128#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
129#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
130
131#define phys_to_page(phys) (pfn_to_page(phys >> PAGE_SHIFT))
132#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
133
134/* PFN start number, because of __MEMORY_START */
135#define PFN_START (__MEMORY_START >> PAGE_SHIFT)
136#define ARCH_PFN_OFFSET (PFN_START)
137#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
138#ifdef CONFIG_FLATMEM
139#define pfn_valid(pfn) ((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
140#endif
141#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
142
143#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
144 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
145
146#include <asm-generic/memory_model.h>
147#include <asm-generic/page.h>
148
149/* vDSO support */
150#ifdef CONFIG_VSYSCALL
151#define __HAVE_ARCH_GATE_AREA
152#endif
153
154/*
155 * Slub defaults to 8-byte alignment, we're only interested in 4.
156 * Slab defaults to BYTES_PER_WORD, which ends up being the same anyways.
157 */
158#define ARCH_KMALLOC_MINALIGN 4
159#define ARCH_SLAB_MINALIGN 4
160
161#endif /* __KERNEL__ */
162#endif /* __ASM_SH_PAGE_H */