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/*
* include/asm-xtensa/highmem.h
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file "COPYING" in the main directory of
* this archive for more details.
*
* Copyright (C) 2003 - 2005 Tensilica Inc.
* Copyright (C) 2014 Cadence Design Systems Inc.
*/
#ifndef _XTENSA_HIGHMEM_H
#define _XTENSA_HIGHMEM_H
#include <asm/cacheflush.h>
#include <asm/fixmap.h>
#include <asm/kmap_types.h>
#include <asm/pgtable.h>
#define PKMAP_BASE (FIXADDR_START - 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
extern pte_t *pkmap_page_table;
void *kmap_high(struct page *page);
void kunmap_high(struct page *page);
static inline void *kmap(struct page *page)
{
BUG_ON(in_interrupt());
if (!PageHighMem(page))
return page_address(page);
return kmap_high(page);
}
static inline void kunmap(struct page *page)
{
BUG_ON(in_interrupt());
if (!PageHighMem(page))
return;
kunmap_high(page);
}
static inline void flush_cache_kmaps(void)
{
flush_cache_all();
}
void *kmap_atomic(struct page *page);
void __kunmap_atomic(void *kvaddr);
void kmap_init(void);
#endif
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