149 lines
3.5 KiB
C
149 lines
3.5 KiB
C
#ifndef _LINUX_HIGHMEM_H
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#define _LINUX_HIGHMEM_H
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/uaccess.h>
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#include <asm/cacheflush.h>
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#ifndef ARCH_HAS_FLUSH_ANON_PAGE
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static inline void flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vmaddr)
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{
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}
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#endif
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#ifndef ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
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static inline void flush_kernel_dcache_page(struct page *page)
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{
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}
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#endif
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#ifdef CONFIG_HIGHMEM
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#include <asm/highmem.h>
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/* declarations for linux/mm/highmem.c */
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unsigned int nr_free_highpages(void);
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extern unsigned long totalhigh_pages;
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void kmap_flush_unused(void);
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#else /* CONFIG_HIGHMEM */
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static inline unsigned int nr_free_highpages(void) { return 0; }
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#define totalhigh_pages 0
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#ifndef ARCH_HAS_KMAP
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static inline void *kmap(struct page *page)
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{
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might_sleep();
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return page_address(page);
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}
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#define kunmap(page) do { (void) (page); } while (0)
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#include <asm/kmap_types.h>
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static inline void *kmap_atomic(struct page *page, enum km_type idx)
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{
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pagefault_disable();
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return page_address(page);
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}
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#define kmap_atomic_prot(page, idx, prot) kmap_atomic(page, idx)
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#define kunmap_atomic(addr, idx) do { pagefault_enable(); } while (0)
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#define kmap_atomic_pfn(pfn, idx) kmap_atomic(pfn_to_page(pfn), (idx))
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#define kmap_atomic_to_page(ptr) virt_to_page(ptr)
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#define kmap_flush_unused() do {} while(0)
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#endif
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#endif /* CONFIG_HIGHMEM */
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/* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */
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static inline void clear_user_highpage(struct page *page, unsigned long vaddr)
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{
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void *addr = kmap_atomic(page, KM_USER0);
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clear_user_page(addr, vaddr, page);
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kunmap_atomic(addr, KM_USER0);
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/* Make sure this page is cleared on other CPU's too before using it */
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smp_wmb();
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}
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#ifndef __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
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static inline struct page *
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alloc_zeroed_user_highpage(struct vm_area_struct *vma, unsigned long vaddr)
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{
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struct page *page = alloc_page_vma(GFP_HIGHUSER, vma, vaddr);
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if (page)
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clear_user_highpage(page, vaddr);
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return page;
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}
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#endif
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static inline void clear_highpage(struct page *page)
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{
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void *kaddr = kmap_atomic(page, KM_USER0);
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clear_page(kaddr);
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kunmap_atomic(kaddr, KM_USER0);
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}
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/*
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* Same but also flushes aliased cache contents to RAM.
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*
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* This must be a macro because KM_USER0 and friends aren't defined if
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* !CONFIG_HIGHMEM
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*/
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#define zero_user_page(page, offset, size, km_type) \
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do { \
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void *kaddr; \
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\
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BUG_ON((offset) + (size) > PAGE_SIZE); \
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\
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kaddr = kmap_atomic(page, km_type); \
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memset((char *)kaddr + (offset), 0, (size)); \
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flush_dcache_page(page); \
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kunmap_atomic(kaddr, (km_type)); \
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} while (0)
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static inline void __deprecated memclear_highpage_flush(struct page *page,
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unsigned int offset, unsigned int size)
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{
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zero_user_page(page, offset, size, KM_USER0);
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}
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#ifndef __HAVE_ARCH_COPY_USER_HIGHPAGE
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static inline void copy_user_highpage(struct page *to, struct page *from,
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unsigned long vaddr, struct vm_area_struct *vma)
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{
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char *vfrom, *vto;
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vfrom = kmap_atomic(from, KM_USER0);
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vto = kmap_atomic(to, KM_USER1);
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copy_user_page(vto, vfrom, vaddr, to);
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kunmap_atomic(vfrom, KM_USER0);
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kunmap_atomic(vto, KM_USER1);
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/* Make sure this page is cleared on other CPU's too before using it */
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smp_wmb();
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}
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#endif
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static inline void copy_highpage(struct page *to, struct page *from)
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{
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char *vfrom, *vto;
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vfrom = kmap_atomic(from, KM_USER0);
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vto = kmap_atomic(to, KM_USER1);
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copy_page(vto, vfrom);
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kunmap_atomic(vfrom, KM_USER0);
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kunmap_atomic(vto, KM_USER1);
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}
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#endif /* _LINUX_HIGHMEM_H */
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