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/arch/parisc/include/asm/page.h

https://github.com/aicjofs/android_kernel_lge_v500_20d
C Header | 170 lines | 110 code | 38 blank | 22 comment | 0 complexity | e3e2111a59b52a783936fa9d9e467d08 MD5 | raw file
  1#ifndef _PARISC_PAGE_H
  2#define _PARISC_PAGE_H
  3
  4#include <linux/const.h>
  5
  6#if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
  7# define PAGE_SHIFT	12
  8#elif defined(CONFIG_PARISC_PAGE_SIZE_16KB)
  9# define PAGE_SHIFT	14
 10#elif defined(CONFIG_PARISC_PAGE_SIZE_64KB)
 11# define PAGE_SHIFT	16
 12#else
 13# error "unknown default kernel page size"
 14#endif
 15#define PAGE_SIZE	(_AC(1,UL) << PAGE_SHIFT)
 16#define PAGE_MASK	(~(PAGE_SIZE-1))
 17
 18
 19#ifndef __ASSEMBLY__
 20
 21#include <asm/types.h>
 22#include <asm/cache.h>
 23
 24#define clear_page(page)	memset((void *)(page), 0, PAGE_SIZE)
 25#define copy_page(to,from)      copy_user_page_asm((void *)(to), (void *)(from))
 26
 27struct page;
 28
 29void copy_user_page_asm(void *to, void *from);
 30void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
 31			   struct page *pg);
 32void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
 33
 34/*
 35 * These are used to make use of C type-checking..
 36 */
 37#define STRICT_MM_TYPECHECKS
 38#ifdef STRICT_MM_TYPECHECKS
 39typedef struct { unsigned long pte; } pte_t; /* either 32 or 64bit */
 40
 41/* NOTE: even on 64 bits, these entries are __u32 because we allocate
 42 * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
 43typedef struct { __u32 pmd; } pmd_t;
 44typedef struct { __u32 pgd; } pgd_t;
 45typedef struct { unsigned long pgprot; } pgprot_t;
 46
 47#define pte_val(x)	((x).pte)
 48/* These do not work lvalues, so make sure we don't use them as such. */
 49#define pmd_val(x)	((x).pmd + 0)
 50#define pgd_val(x)	((x).pgd + 0)
 51#define pgprot_val(x)	((x).pgprot)
 52
 53#define __pte(x)	((pte_t) { (x) } )
 54#define __pmd(x)	((pmd_t) { (x) } )
 55#define __pgd(x)	((pgd_t) { (x) } )
 56#define __pgprot(x)	((pgprot_t) { (x) } )
 57
 58#define __pmd_val_set(x,n) (x).pmd = (n)
 59#define __pgd_val_set(x,n) (x).pgd = (n)
 60
 61#else
 62/*
 63 * .. while these make it easier on the compiler
 64 */
 65typedef unsigned long pte_t;
 66typedef         __u32 pmd_t;
 67typedef         __u32 pgd_t;
 68typedef unsigned long pgprot_t;
 69
 70#define pte_val(x)      (x)
 71#define pmd_val(x)      (x)
 72#define pgd_val(x)      (x)
 73#define pgprot_val(x)   (x)
 74
 75#define __pte(x)        (x)
 76#define __pmd(x)	(x)
 77#define __pgd(x)        (x)
 78#define __pgprot(x)     (x)
 79
 80#define __pmd_val_set(x,n) (x) = (n)
 81#define __pgd_val_set(x,n) (x) = (n)
 82
 83#endif /* STRICT_MM_TYPECHECKS */
 84
 85typedef struct page *pgtable_t;
 86
 87typedef struct __physmem_range {
 88	unsigned long start_pfn;
 89	unsigned long pages;       /* PAGE_SIZE pages */
 90} physmem_range_t;
 91
 92extern physmem_range_t pmem_ranges[];
 93extern int npmem_ranges;
 94
 95#endif /* !__ASSEMBLY__ */
 96
 97/* WARNING: The definitions below must match exactly to sizeof(pte_t)
 98 * etc
 99 */
100#ifdef CONFIG_64BIT
101#define BITS_PER_PTE_ENTRY	3
102#define BITS_PER_PMD_ENTRY	2
103#define BITS_PER_PGD_ENTRY	2
104#else
105#define BITS_PER_PTE_ENTRY	2
106#define BITS_PER_PMD_ENTRY	2
107#define BITS_PER_PGD_ENTRY	BITS_PER_PMD_ENTRY
108#endif
109#define PGD_ENTRY_SIZE	(1UL << BITS_PER_PGD_ENTRY)
110#define PMD_ENTRY_SIZE	(1UL << BITS_PER_PMD_ENTRY)
111#define PTE_ENTRY_SIZE	(1UL << BITS_PER_PTE_ENTRY)
112
113#define LINUX_GATEWAY_SPACE     0
114
115/* This governs the relationship between virtual and physical addresses.
116 * If you alter it, make sure to take care of our various fixed mapping
117 * segments in fixmap.h */
118#ifdef CONFIG_64BIT
119#define __PAGE_OFFSET	(0x40000000)	/* 1GB */
120#else
121#define __PAGE_OFFSET	(0x10000000)	/* 256MB */
122#endif
123
124#define PAGE_OFFSET		((unsigned long)__PAGE_OFFSET)
125
126/* The size of the gateway page (we leave lots of room for expansion) */
127#define GATEWAY_PAGE_SIZE	0x4000
128
129/* The start of the actual kernel binary---used in vmlinux.lds.S
130 * Leave some space after __PAGE_OFFSET for detecting kernel null
131 * ptr derefs */
132#define KERNEL_BINARY_TEXT_START	(__PAGE_OFFSET + 0x100000)
133
134/* These macros don't work for 64-bit C code -- don't allow in C at all */
135#ifdef __ASSEMBLY__
136#   define PA(x)	((x)-__PAGE_OFFSET)
137#   define VA(x)	((x)+__PAGE_OFFSET)
138#endif
139#define __pa(x)			((unsigned long)(x)-PAGE_OFFSET)
140#define __va(x)			((void *)((unsigned long)(x)+PAGE_OFFSET))
141
142#ifndef CONFIG_DISCONTIGMEM
143#define pfn_valid(pfn)		((pfn) < max_mapnr)
144#endif /* CONFIG_DISCONTIGMEM */
145
146#ifdef CONFIG_HUGETLB_PAGE
147#define HPAGE_SHIFT		22	/* 4MB (is this fixed?) */
148#define HPAGE_SIZE      	((1UL) << HPAGE_SHIFT)
149#define HPAGE_MASK		(~(HPAGE_SIZE - 1))
150#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
151#endif
152
153#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
154
155#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
156#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
157
158#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
159				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
160
161#include <asm-generic/memory_model.h>
162#include <asm-generic/getorder.h>
163#include <asm/pdc.h>
164
165#define PAGE0   ((struct zeropage *)__PAGE_OFFSET)
166
167/* DEFINITION OF THE ZERO-PAGE (PAG0) */
168/* based on work by Jason Eckhardt (jason@equator.com) */
169
170#endif /* _PARISC_PAGE_H */