fd4fd5aac1
Someone mentioned that almost all the architectures used basically the same implementation of get_order. This patch consolidates them into asm-generic/page.h and includes that in the appropriate places. The exceptions are ia64 and ppc which have their own (presumably optimised) versions. Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
151 lines
4.2 KiB
C
151 lines
4.2 KiB
C
#ifndef _PARISC_PAGE_H
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#define _PARISC_PAGE_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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#ifdef __KERNEL__
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#include <linux/config.h>
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#ifndef __ASSEMBLY__
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#include <asm/types.h>
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#include <asm/cache.h>
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#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
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#define copy_page(to,from) copy_user_page_asm((void *)(to), (void *)(from))
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struct page;
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extern void purge_kernel_dcache_page(unsigned long);
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extern void copy_user_page_asm(void *to, void *from);
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extern void clear_user_page_asm(void *page, unsigned long vaddr);
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static inline void
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copy_user_page(void *vto, void *vfrom, unsigned long vaddr, struct page *pg)
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{
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copy_user_page_asm(vto, vfrom);
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flush_kernel_dcache_page(vto);
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/* XXX: ppc flushes icache too, should we? */
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}
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static inline void
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clear_user_page(void *page, unsigned long vaddr, struct page *pg)
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{
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purge_kernel_dcache_page((unsigned long)page);
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clear_user_page_asm(page, vaddr);
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}
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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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#ifdef __LP64__
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typedef struct { unsigned long pte; } pte_t;
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#else
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typedef struct {
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unsigned long pte;
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unsigned long flags;
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} pte_t;
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#endif
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/* NOTE: even on 64 bits, these entries are __u32 because we allocate
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* the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
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typedef struct { __u32 pmd; } pmd_t;
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typedef struct { __u32 pgd; } pgd_t;
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typedef struct { unsigned long pgprot; } pgprot_t;
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#define pte_val(x) ((x).pte)
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#ifdef __LP64__
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#define pte_flags(x) (*(__u32 *)&((x).pte))
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#else
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#define pte_flags(x) ((x).flags)
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#endif
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/* These do not work lvalues, so make sure we don't use them as such. */
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#define pmd_val(x) ((x).pmd + 0)
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#define pgd_val(x) ((x).pgd + 0)
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#define pgprot_val(x) ((x).pgprot)
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#define __pmd_val_set(x,n) (x).pmd = (n)
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#define __pgd_val_set(x,n) (x).pgd = (n)
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#define __pte(x) ((pte_t) { (x) } )
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#define __pmd(x) ((pmd_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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typedef struct __physmem_range {
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unsigned long start_pfn;
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unsigned long pages; /* PAGE_SIZE pages */
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} physmem_range_t;
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extern physmem_range_t pmem_ranges[];
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extern int npmem_ranges;
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#endif /* !__ASSEMBLY__ */
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/* WARNING: The definitions below must match exactly to sizeof(pte_t)
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* etc
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*/
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#ifdef __LP64__
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#define BITS_PER_PTE_ENTRY 3
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#define BITS_PER_PMD_ENTRY 2
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#define BITS_PER_PGD_ENTRY 2
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#else
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#define BITS_PER_PTE_ENTRY 3
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#define BITS_PER_PMD_ENTRY 2
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#define BITS_PER_PGD_ENTRY BITS_PER_PMD_ENTRY
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#endif
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#define PGD_ENTRY_SIZE (1UL << BITS_PER_PGD_ENTRY)
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#define PMD_ENTRY_SIZE (1UL << BITS_PER_PMD_ENTRY)
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#define PTE_ENTRY_SIZE (1UL << BITS_PER_PTE_ENTRY)
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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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#define LINUX_GATEWAY_SPACE 0
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/* This governs the relationship between virtual and physical addresses.
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* If you alter it, make sure to take care of our various fixed mapping
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* segments in fixmap.h */
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#define __PAGE_OFFSET (0x10000000)
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#define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
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/* The size of the gateway page (we leave lots of room for expansion) */
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#define GATEWAY_PAGE_SIZE 0x4000
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/* The start of the actual kernel binary---used in vmlinux.lds.S
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* Leave some space after __PAGE_OFFSET for detecting kernel null
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* ptr derefs */
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#define KERNEL_BINARY_TEXT_START (__PAGE_OFFSET + 0x100000)
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/* These macros don't work for 64-bit C code -- don't allow in C at all */
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#ifdef __ASSEMBLY__
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# define PA(x) ((x)-__PAGE_OFFSET)
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# define VA(x) ((x)+__PAGE_OFFSET)
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#endif
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#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
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#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
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#ifndef CONFIG_DISCONTIGMEM
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#define pfn_to_page(pfn) (mem_map + (pfn))
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#define page_to_pfn(page) ((unsigned long)((page) - mem_map))
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#define pfn_valid(pfn) ((pfn) < max_mapnr)
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#endif /* CONFIG_DISCONTIGMEM */
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#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
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#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
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#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
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#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
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VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
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#endif /* __KERNEL__ */
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#include <asm-generic/page.h>
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#endif /* _PARISC_PAGE_H */
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