page.h 4.37 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135
#ifndef _PARISC_PAGE_H
#define _PARISC_PAGE_H

/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT	12
#define PAGE_SIZE	(1UL << PAGE_SHIFT)
#define PAGE_MASK	(~(PAGE_SIZE-1))

#ifdef __KERNEL__
#include <linux/config.h>
#ifndef __ASSEMBLY__

#include <asm/types.h>
#include <asm/cache.h>

#define clear_page(page)	memset((void *)(page), 0, PAGE_SIZE)
#define copy_page(to,from)      copy_user_page_asm((void *)(to), (void *)(from))

struct page;

extern void purge_kernel_dcache_page(unsigned long);
extern void copy_user_page_asm(void *to, void *from);
extern void clear_user_page_asm(void *page, unsigned long vaddr);

static inline void
copy_user_page(void *vto, void *vfrom, unsigned long vaddr, struct page *pg)
{
	copy_user_page_asm(vto, vfrom);
	flush_kernel_dcache_page(vto);
	/* XXX: ppc flushes icache too, should we? */
}

static inline void
clear_user_page(void *page, unsigned long vaddr, struct page *pg)
{
	purge_kernel_dcache_page((unsigned long)page);
	clear_user_page_asm(page, vaddr);
}

/*
 * These are used to make use of C type-checking..
 */
#ifdef __LP64__
typedef struct { unsigned long pte; } pte_t;
#else
typedef struct {
	unsigned long pte;
	unsigned long flags;
} pte_t;
#endif
/* NOTE: even on 64 bits, these entries are __u32 because we allocate
 * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
typedef struct { __u32 pmd; } pmd_t;
typedef struct { __u32 pgd; } pgd_t;
typedef struct { unsigned long pgprot; } pgprot_t;

#define pte_val(x)	((x).pte)
#ifdef __LP64__
#define pte_flags(x)	(*(__u32 *)&((x).pte))
#else
#define pte_flags(x)	((x).flags)
#endif

/* These do not work lvalues, so make sure we don't use them as such. */
#define pmd_val(x)	((x).pmd + 0)
#define pgd_val(x)	((x).pgd + 0)
#define pgprot_val(x)	((x).pgprot)

#define __pmd_val_set(x,n) (x).pmd = (n)
#define __pgd_val_set(x,n) (x).pgd = (n)

#define __pte(x)	((pte_t) { (x) } )
#define __pmd(x)	((pmd_t) { (x) } )
#define __pgd(x)	((pgd_t) { (x) } )
#define __pgprot(x)	((pgprot_t) { (x) } )

typedef struct __physmem_range {
	unsigned long start_pfn;
	unsigned long pages;       /* PAGE_SIZE pages */
} physmem_range_t;

extern physmem_range_t pmem_ranges[];
extern int npmem_ranges;

#endif /* !__ASSEMBLY__ */

/* WARNING: The definitions below must match exactly to sizeof(pte_t)
 * etc
 */
#ifdef __LP64__
#define BITS_PER_PTE_ENTRY	3
#define BITS_PER_PMD_ENTRY	2
#define BITS_PER_PGD_ENTRY	2
#else
#define BITS_PER_PTE_ENTRY	3
#define BITS_PER_PMD_ENTRY	2
#define BITS_PER_PGD_ENTRY	BITS_PER_PMD_ENTRY
#endif
#define PGD_ENTRY_SIZE	(1UL << BITS_PER_PGD_ENTRY)
#define PMD_ENTRY_SIZE	(1UL << BITS_PER_PMD_ENTRY)
#define PTE_ENTRY_SIZE	(1UL << BITS_PER_PTE_ENTRY)

/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr)	(((addr)+PAGE_SIZE-1)&PAGE_MASK)


#define LINUX_GATEWAY_SPACE     0

/* This governs the relationship between virtual and physical addresses.
 * If you alter it, make sure to take care of our various fixed mapping
 * segments in fixmap.h */
#define __PAGE_OFFSET           (0x10000000)

#define PAGE_OFFSET		((unsigned long)__PAGE_OFFSET)

/* The size of the gateway page (we leave lots of room for expansion) */
#define GATEWAY_PAGE_SIZE	0x4000

/* The start of the actual kernel binary---used in vmlinux.lds.S
 * Leave some space after __PAGE_OFFSET for detecting kernel null
 * ptr derefs */
#define KERNEL_BINARY_TEXT_START	(__PAGE_OFFSET + 0x100000)

/* These macros don't work for 64-bit C code -- don't allow in C at all */
#ifdef __ASSEMBLY__
#   define PA(x)	((x)-__PAGE_OFFSET)
#   define VA(x)	((x)+__PAGE_OFFSET)
#endif
#define __pa(x)			((unsigned long)(x)-PAGE_OFFSET)
#define __va(x)			((void *)((unsigned long)(x)+PAGE_OFFSET))

#ifndef CONFIG_DISCONTIGMEM
#define pfn_valid(pfn)		((pfn) < max_mapnr)
#endif /* CONFIG_DISCONTIGMEM */

136 137 138 139 140 141 142
#ifdef CONFIG_HUGETLB_PAGE
#define HPAGE_SHIFT		22	/* 4MB (is this fixed?) */
#define HPAGE_SIZE      	((1UL) << HPAGE_SHIFT)
#define HPAGE_MASK		(~(HPAGE_SIZE - 1))
#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
#endif

Linus Torvalds's avatar
Linus Torvalds committed
143 144 145 146 147 148 149 150 151 152
#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)

#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)

#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

#endif /* __KERNEL__ */

153
#include <asm-generic/memory_model.h>
154 155
#include <asm-generic/page.h>

Linus Torvalds's avatar
Linus Torvalds committed
156
#endif /* _PARISC_PAGE_H */