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#ifndef _LINUX_HIGHMEM_H
#define _LINUX_HIGHMEM_H
#include <linux/config.h>
#include <asm/pgalloc.h>
#ifdef CONFIG_HIGHMEM
extern struct page *highmem_start_page;
#include <asm/highmem.h>
/* declarations for linux/mm/highmem.c */
extern unsigned long highmem_mapnr;
FASTCALL(unsigned int nr_free_highpages(void));
extern struct page * prepare_highmem_swapout(struct page *);
extern struct page * replace_with_highmem(struct page *);
extern struct buffer_head * create_bounce(int rw, struct buffer_head * bh_orig);
#else /* CONFIG_HIGHMEM */
extern inline unsigned int nr_free_highpages(void) { return 0; }
#define prepare_highmem_swapout(page) page
#define replace_with_highmem(page) page
#define kmap(page) page_address(page)
#define kunmap(page) do { } while (0)
#endif /* CONFIG_HIGHMEM */
/* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */
extern inline void clear_highpage(struct page *page)
{
unsigned long kaddr;
kaddr = kmap(page);
clear_page((void *)kaddr);
kunmap(page);
}
extern inline void memclear_highpage(struct page *page, unsigned int offset, unsigned int size)
{
unsigned long kaddr;
if (offset + size > PAGE_SIZE)
BUG();
kaddr = kmap(page);
memset((void *)(kaddr + offset), 0, size);
kunmap(page);
}
/*
* Same but also flushes aliased cache contents to RAM.
*/
extern inline void memclear_highpage_flush(struct page *page, unsigned int offset, unsigned int size)
{
unsigned long kaddr;
if (offset + size > PAGE_SIZE)
BUG();
kaddr = kmap(page);
memset((void *)(kaddr + offset), 0, size);
flush_page_to_ram(page);
kunmap(page);
}
extern inline void copy_highpage(struct page *to, struct page *from)
{
unsigned long vfrom, vto;
vfrom = kmap(from);
vto = kmap(to);
copy_page((void *)vto, (void *)vfrom);
kunmap(from);
kunmap(to);
}
#endif /* _LINUX_HIGHMEM_H */
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