arch/arm/include/asm/highmem.h

#ifndef _ASM_HIGHMEM_H
#define _ASM_HIGHMEM_H

#include <asm/kmap_types.h>

#define PKMAP_BASE		(PAGE_OFFSET - PMD_SIZE)
#define LAST_PKMAP		PTRS_PER_PTE
#define LAST_PKMAP_MASK		(LAST_PKMAP - 1)
#define PKMAP_NR(virt)		(((virt) - PKMAP_BASE) >> PAGE_SHIFT)
#define PKMAP_ADDR(nr)		(PKMAP_BASE + ((nr) << PAGE_SHIFT))

#define kmap_prot		PAGE_KERNEL

#define flush_cache_kmaps() \
	do { \
		if (cache_is_vivt()) \
			flush_cache_all(); \
	} while (0)

extern pte_t *pkmap_page_table;

#define ARCH_NEEDS_KMAP_HIGH_GET

extern void *kmap_high(struct page *page);
extern void *kmap_high_get(struct page *page);
extern void kunmap_high(struct page *page);

/*
 * The following functions are already defined by <linux/highmem.h>
 * when CONFIG_HIGHMEM is not set.
 */
#ifdef CONFIG_HIGHMEM
extern void *kmap(struct page *page);
extern void kunmap(struct page *page);
extern void *__kmap_atomic(struct page *page);
extern void __kunmap_atomic(void *kvaddr);
extern void *kmap_atomic_pfn(unsigned long pfn);
extern struct page *kmap_atomic_to_page(const void *ptr);
#endif

#endif