1/* 2 * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com) 3 * Copyright 2003 PathScale, Inc. 4 * Licensed under the GPL 5 */ 6 7#ifndef __UM_PAGE_H 8#define __UM_PAGE_H 9 10#include <linux/const.h> 11 12/* PAGE_SHIFT determines the page size */ 13#define PAGE_SHIFT 12 14#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) 15#define PAGE_MASK (~(PAGE_SIZE-1)) 16 17#ifndef __ASSEMBLY__ 18 19struct page; 20 21#include <linux/types.h> 22#include <sysdep/vm-flags.h> 23 24/* 25 * These are used to make use of C type-checking.. 26 */ 27 28#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE) 29#define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE) 30 31#define clear_user_page(page, vaddr, pg) clear_page(page) 32#define copy_user_page(to, from, vaddr, pg) copy_page(to, from) 33 34#if defined(CONFIG_3_LEVEL_PGTABLES) && !defined(CONFIG_64BIT) 35 36typedef struct { unsigned long pte_low, pte_high; } pte_t; 37typedef struct { unsigned long pmd; } pmd_t; 38typedef struct { unsigned long pgd; } pgd_t; 39#define pte_val(x) ((x).pte_low | ((unsigned long long) (x).pte_high << 32)) 40 41#define pte_get_bits(pte, bits) ((pte).pte_low & (bits)) 42#define pte_set_bits(pte, bits) ((pte).pte_low |= (bits)) 43#define pte_clear_bits(pte, bits) ((pte).pte_low &= ~(bits)) 44#define pte_copy(to, from) ({ (to).pte_high = (from).pte_high; \ 45 smp_wmb(); \ 46 (to).pte_low = (from).pte_low; }) 47#define pte_is_zero(pte) (!((pte).pte_low & ~_PAGE_NEWPAGE) && !(pte).pte_high) 48#define pte_set_val(pte, phys, prot) \ 49 ({ (pte).pte_high = (phys) >> 32; \ 50 (pte).pte_low = (phys) | pgprot_val(prot); }) 51 52#define pmd_val(x) ((x).pmd) 53#define __pmd(x) ((pmd_t) { (x) } ) 54 55typedef unsigned long long pfn_t; 56typedef unsigned long long phys_t; 57 58#else 59 60typedef struct { unsigned long pte; } pte_t; 61typedef struct { unsigned long pgd; } pgd_t; 62 63#ifdef CONFIG_3_LEVEL_PGTABLES 64typedef struct { unsigned long pmd; } pmd_t; 65#define pmd_val(x) ((x).pmd) 66#define __pmd(x) ((pmd_t) { (x) } ) 67#endif 68 69#define pte_val(x) ((x).pte) 70 71 72#define pte_get_bits(p, bits) ((p).pte & (bits)) 73#define pte_set_bits(p, bits) ((p).pte |= (bits)) 74#define pte_clear_bits(p, bits) ((p).pte &= ~(bits)) 75#define pte_copy(to, from) ((to).pte = (from).pte) 76#define pte_is_zero(p) (!((p).pte & ~_PAGE_NEWPAGE)) 77#define pte_set_val(p, phys, prot) (p).pte = (phys | pgprot_val(prot)) 78 79typedef unsigned long pfn_t; 80typedef unsigned long phys_t; 81 82#endif 83 84typedef struct { unsigned long pgprot; } pgprot_t; 85 86typedef struct page *pgtable_t; 87 88#define pgd_val(x) ((x).pgd) 89#define pgprot_val(x) ((x).pgprot) 90 91#define __pte(x) ((pte_t) { (x) } ) 92#define __pgd(x) ((pgd_t) { (x) } ) 93#define __pgprot(x) ((pgprot_t) { (x) } ) 94 95extern unsigned long uml_physmem; 96 97#define PAGE_OFFSET (uml_physmem) 98#define KERNELBASE PAGE_OFFSET 99 100#define __va_space (8*1024*1024) 101 102#include "mem.h" 103 104/* Cast to unsigned long before casting to void * to avoid a warning from 105 * mmap_kmem about cutting a long long down to a void *. Not sure that 106 * casting is the right thing, but 32-bit UML can't have 64-bit virtual 107 * addresses 108 */ 109#define __pa(virt) to_phys((void *) (unsigned long) (virt)) 110#define __va(phys) to_virt((unsigned long) (phys)) 111 112#define phys_to_pfn(p) ((pfn_t) ((p) >> PAGE_SHIFT)) 113#define pfn_to_phys(pfn) ((phys_t) ((pfn) << PAGE_SHIFT)) 114 115#define pfn_valid(pfn) ((pfn) < max_mapnr) 116#define virt_addr_valid(v) pfn_valid(phys_to_pfn(__pa(v))) 117 118#include <asm-generic/memory_model.h> 119#include <asm-generic/getorder.h> 120 121#endif /* __ASSEMBLY__ */ 122#endif /* __UM_PAGE_H */ 123