140 lines
3.8 KiB
C
140 lines
3.8 KiB
C
/*
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* Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
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* Copyright 2003 PathScale, Inc.
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* Licensed under the GPL
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*/
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#ifndef __UM_PAGE_H
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#define __UM_PAGE_H
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struct page;
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#include <linux/config.h>
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#include <asm/vm-flags.h>
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/* PAGE_SHIFT determines the page size */
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#define PAGE_SHIFT 12
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#define PAGE_SIZE (1UL << PAGE_SHIFT)
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#define PAGE_MASK (~(PAGE_SIZE-1))
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/*
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* These are used to make use of C type-checking..
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*/
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#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
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#define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
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#define clear_user_page(page, vaddr, pg) clear_page(page)
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#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
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#if defined(CONFIG_3_LEVEL_PGTABLES) && !defined(CONFIG_64BIT)
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typedef struct { unsigned long pte_low, pte_high; } pte_t;
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typedef struct { unsigned long long pmd; } pmd_t;
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typedef struct { unsigned long pgd; } pgd_t;
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#define pte_val(x) ((x).pte_low | ((unsigned long long) (x).pte_high << 32))
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#define pte_get_bits(pte, bits) ((pte).pte_low & (bits))
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#define pte_set_bits(pte, bits) ((pte).pte_low |= (bits))
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#define pte_clear_bits(pte, bits) ((pte).pte_low &= ~(bits))
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#define pte_copy(to, from) ({ (to).pte_high = (from).pte_high; \
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smp_wmb(); \
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(to).pte_low = (from).pte_low; })
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#define pte_is_zero(pte) (!((pte).pte_low & ~_PAGE_NEWPAGE) && !(pte).pte_high)
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#define pte_set_val(pte, phys, prot) \
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({ (pte).pte_high = (phys) >> 32; \
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(pte).pte_low = (phys) | pgprot_val(prot); })
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#define pmd_val(x) ((x).pmd)
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#define __pmd(x) ((pmd_t) { (x) } )
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typedef unsigned long long pfn_t;
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typedef unsigned long long phys_t;
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#else
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typedef struct { unsigned long pte; } pte_t;
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typedef struct { unsigned long pgd; } pgd_t;
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#ifdef CONFIG_3_LEVEL_PGTABLES
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typedef struct { unsigned long pmd; } pmd_t;
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#define pmd_val(x) ((x).pmd)
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#define __pmd(x) ((pmd_t) { (x) } )
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#endif
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#define pte_val(x) ((x).pte)
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#define pte_get_bits(p, bits) ((p).pte & (bits))
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#define pte_set_bits(p, bits) ((p).pte |= (bits))
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#define pte_clear_bits(p, bits) ((p).pte &= ~(bits))
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#define pte_copy(to, from) ((to).pte = (from).pte)
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#define pte_is_zero(p) (!((p).pte & ~_PAGE_NEWPAGE))
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#define pte_set_val(p, phys, prot) (p).pte = (phys | pgprot_val(prot))
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typedef unsigned long pfn_t;
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typedef unsigned long phys_t;
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#endif
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typedef struct { unsigned long pgprot; } pgprot_t;
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#define pgd_val(x) ((x).pgd)
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#define pgprot_val(x) ((x).pgprot)
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#define __pte(x) ((pte_t) { (x) } )
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#define __pgd(x) ((pgd_t) { (x) } )
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#define __pgprot(x) ((pgprot_t) { (x) } )
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/* to align the pointer to the (next) page boundary */
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#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
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extern unsigned long uml_physmem;
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#define PAGE_OFFSET (uml_physmem)
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#define KERNELBASE PAGE_OFFSET
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#define __va_space (8*1024*1024)
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extern unsigned long to_phys(void *virt);
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extern void *to_virt(unsigned long phys);
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/* Cast to unsigned long before casting to void * to avoid a warning from
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* mmap_kmem about cutting a long long down to a void *. Not sure that
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* casting is the right thing, but 32-bit UML can't have 64-bit virtual
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* addresses
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*/
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#define __pa(virt) to_phys((void *) (unsigned long) (virt))
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#define __va(phys) to_virt((unsigned long) (phys))
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#define page_to_pfn(page) ((page) - mem_map)
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#define pfn_to_page(pfn) (mem_map + (pfn))
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#define phys_to_pfn(p) ((p) >> PAGE_SHIFT)
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#define pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
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#define pfn_valid(pfn) ((pfn) < max_mapnr)
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#define virt_addr_valid(v) pfn_valid(phys_to_pfn(__pa(v)))
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/* Pure 2^n version of get_order */
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static __inline__ int get_order(unsigned long size)
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{
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int order;
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size = (size-1) >> (PAGE_SHIFT-1);
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order = -1;
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do {
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size >>= 1;
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order++;
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} while (size);
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return order;
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}
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extern struct page *arch_validate(struct page *page, int mask, int order);
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#define HAVE_ARCH_VALIDATE
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extern void arch_free_page(struct page *page, int order);
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#define HAVE_ARCH_FREE_PAGE
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#endif
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