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/* vDSO support */
190#ifdef CONFIG_VSYSCALL
191#define __HAVE_ARCH_GATE_AREA
192#endif
193
194/*
195 * Some drivers need to perform DMA into kmalloc'ed buffers
196 * and so we have to increase the kmalloc minalign for this.
197 */
198#define ARCH_DMA_MINALIGN	L1_CACHE_BYTES
199
200#ifdef CONFIG_SUPERH64
201/*
202 * While BYTES_PER_WORD == 4 on the current sh64 ABI, GCC will still
203 * happily generate {ld/st}.q pairs, requiring us to have 8-byte
204 * alignment to avoid traps. The kmalloc alignment is guaranteed by
205 * virtue of L1_CACHE_BYTES, requiring this to only be special cased
206 * for slab caches.
207 */
208#define ARCH_SLAB_MINALIGN	8
209#endif
210
211#endif /* __ASM_SH_PAGE_H */