1#ifndef __ASM_SH_PAGE_H
2#define __ASM_SH_PAGE_H
3
4/*
5 * Copyright (C) 1999  Niibe Yutaka
6 */
7
8#include <linux/const.h>
9
10/* PAGE_SHIFT determines the page size */
11#if defined(CONFIG_PAGE_SIZE_4KB)
12# define PAGE_SHIFT	12
13#elif defined(CONFIG_PAGE_SIZE_8KB)
14# define PAGE_SHIFT	13
15#elif defined(CONFIG_PAGE_SIZE_16KB)
16# define PAGE_SHIFT	14
17#elif defined(CONFIG_PAGE_SIZE_64KB)
18# define PAGE_SHIFT	16
19#else
20# error "Bogus kernel page size?"
21#endif
22
23#define PAGE_SIZE	(_AC(1, UL) << PAGE_SHIFT)
24#define PAGE_MASK	(~(PAGE_SIZE-1))
25#define PTE_MASK	PAGE_MASK
26
27#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
28#define HPAGE_SHIFT	16
29#elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
30#define HPAGE_SHIFT	18
31#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
32#define HPAGE_SHIFT	20
33#elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
34#define HPAGE_SHIFT	22
35#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
36#define HPAGE_SHIFT	26
37#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512MB)
38#define HPAGE_SHIFT	29
39#endif
40
41#ifdef CONFIG_HUGETLB_PAGE
42#define HPAGE_SIZE		(1UL << HPAGE_SHIFT)
43#define HPAGE_MASK		(~(HPAGE_SIZE-1))
44#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT-PAGE_SHIFT)
45#endif
46
47#ifndef __ASSEMBLY__
48#include <asm/uncached.h>
49
50extern unsigned long shm_align_mask;
51extern unsigned long max_low_pfn, min_low_pfn;
52extern unsigned long memory_start, memory_end, memory_limit;
53
54static inline unsigned long
55pages_do_alias(unsigned long addr1, unsigned long addr2)
56{
57	return (addr1 ^ addr2) & shm_align_mask;
58}
59
60#define clear_page(page)	memset((void *)(page), 0, PAGE_SIZE)
61extern void copy_page(void *to, void *from);
62
63struct page;
64struct vm_area_struct;
65
66extern void copy_user_highpage(struct page *to, struct page *from,
67			       unsigned long vaddr, struct vm_area_struct *vma);
68#define __HAVE_ARCH_COPY_USER_HIGHPAGE
69extern void clear_user_highpage(struct page *page, unsigned long vaddr);
70#define clear_user_highpage	clear_user_highpage
71
72/*
73 * These are used to make use of C type-checking..
74 */
75#ifdef CONFIG_X2TLB
76typedef struct { unsigned long pte_low, pte_high; } pte_t;
77typedef struct { unsigned long long pgprot; } pgprot_t;
78typedef struct { unsigned long long pgd; } pgd_t;
79#define pte_val(x) \
80	((x).pte_low | ((unsigned long long)(x).pte_high << 32))
81#define __pte(x) \
82	({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
83#elif defined(CONFIG_SUPERH32)
84typedef struct { unsigned long pte_low; } pte_t;
85typedef struct { unsigned long pgprot; } pgprot_t;
86typedef struct { unsigned long pgd; } pgd_t;
87#define pte_val(x)	((x).pte_low)
88#define __pte(x)	((pte_t) { (x) } )
89#else
90typedef struct { unsigned long long pte_low; } pte_t;
91typedef struct { unsigned long long pgprot; } pgprot_t;
92typedef struct { unsigned long pgd; } pgd_t;
93#define pte_val(x)	((x).pte_low)
94#define __pte(x)	((pte_t) { (x) } )
95#endif
96
97#define pgd_val(x)	((x).pgd)
98#define pgprot_val(x)	((x).pgprot)
99
100#define __pgd(x) ((pgd_t) { (x) } )
101#define __pgprot(x)	((pgprot_t) { (x) } )
102
103typedef struct page *pgtable_t;
104
105#define pte_pgprot(x) __pgprot(pte_val(x) & PTE_FLAGS_MASK)
106
107#endif /* !__ASSEMBLY__ */
108
109/*
110 * __MEMORY_START and SIZE are the physical addresses and size of RAM.
111 */
112#define __MEMORY_START		CONFIG_MEMORY_START
113#define __MEMORY_SIZE		CONFIG_MEMORY_SIZE
114
115/*
116 * PHYSICAL_OFFSET is the offset in physical memory where the base
117 * of the kernel is loaded.
118 */
119#ifdef CONFIG_PHYSICAL_START
120#define PHYSICAL_OFFSET (CONFIG_PHYSICAL_START - __MEMORY_START)
121#else
122#define PHYSICAL_OFFSET 0
123#endif
124
125/*
126 * PAGE_OFFSET is the virtual address of the start of kernel address
127 * space.
128 */
129#define PAGE_OFFSET		CONFIG_PAGE_OFFSET
130
131/*
132 * Virtual to physical RAM address translation.
133 *
134 * In 29 bit mode, the physical offset of RAM from address 0 is visible in
135 * the kernel virtual address space, and thus we don't have to take
136 * this into account when translating. However in 32 bit mode this offset
137 * is not visible (it is part of the PMB mapping) and so needs to be
138 * added or subtracted as required.
139 */
140#ifdef CONFIG_PMB
141#define ___pa(x)	((x)-PAGE_OFFSET+__MEMORY_START)
142#define ___va(x)	((x)+PAGE_OFFSET-__MEMORY_START)
143#else
144#define ___pa(x)	((x)-PAGE_OFFSET)
145#define ___va(x)	((x)+PAGE_OFFSET)
146#endif
147
148#ifndef __ASSEMBLY__
149#define __pa(x)		___pa((unsigned long)x)
150#define __va(x)		(void *)___va((unsigned long)x)
151#endif /* !__ASSEMBLY__ */
152
153#ifdef CONFIG_UNCACHED_MAPPING
154#if defined(CONFIG_29BIT)
155#define UNCAC_ADDR(addr)	P2SEGADDR(addr)
156#define CAC_ADDR(addr)		P1SEGADDR(addr)
157#else
158#define UNCAC_ADDR(addr)	((addr) - PAGE_OFFSET + uncached_start)
159#define CAC_ADDR(addr)		((addr) - uncached_start + PAGE_OFFSET)
160#endif
161#else
162#define UNCAC_ADDR(addr)	((addr))
163#define CAC_ADDR(addr)		((addr))
164#endif
165
166#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
167#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
168
169/*
170 * PFN = physical frame number (ie PFN 0 == physical address 0)
171 * PFN_START is the PFN of the first page of RAM. By defining this we
172 * don't have struct page entries for the portion of address space
173 * between physical address 0 and the start of RAM.
174 */
175#define PFN_START		(__MEMORY_START >> PAGE_SHIFT)
176#define ARCH_PFN_OFFSET		(PFN_START)
177#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
178#ifdef CONFIG_FLATMEM
179#define pfn_valid(pfn)		((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
180#endif
181#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
182
183#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
184				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
185
186#include <asm-generic/memory_model.h>
187#include <asm-generic/getorder.h>
188
189/*
190 * Some drivers need to perform DMA into kmalloc'ed buffers
191 * and so we have to increase the kmalloc minalign for this.
192 */
193#define ARCH_DMA_MINALIGN	L1_CACHE_BYTES
194
195#ifdef CONFIG_SUPERH64
196/*
197 * While BYTES_PER_WORD == 4 on the current sh64 ABI, GCC will still
198 * happily generate {ld/st}.q pairs, requiring us to have 8-byte
199 * alignment to avoid traps. The kmalloc alignment is guaranteed by
200 * virtue of L1_CACHE_BYTES, requiring this to only be special cased
201 * for slab caches.
202 */
203#define ARCH_SLAB_MINALIGN	8
204#endif
205
206#endif /* __ASM_SH_PAGE_H */
207