62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
/*
|
|
* Copyright (C) 2015 Synopsys, Inc. (www.synopsys.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
*/
|
|
|
|
#ifndef _ASM_HIGHMEM_H
|
|
#define _ASM_HIGHMEM_H
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
|
|
#include <uapi/asm/page.h>
|
|
#include <asm/kmap_types.h>
|
|
|
|
/* start after vmalloc area */
|
|
#define FIXMAP_BASE (PAGE_OFFSET - FIXMAP_SIZE - PKMAP_SIZE)
|
|
#define FIXMAP_SIZE PGDIR_SIZE /* only 1 PGD worth */
|
|
#define KM_TYPE_NR ((FIXMAP_SIZE >> PAGE_SHIFT)/NR_CPUS)
|
|
#define FIXMAP_ADDR(nr) (FIXMAP_BASE + ((nr) << PAGE_SHIFT))
|
|
|
|
/* start after fixmap area */
|
|
#define PKMAP_BASE (FIXMAP_BASE + FIXMAP_SIZE)
|
|
#define PKMAP_SIZE PGDIR_SIZE
|
|
#define LAST_PKMAP (PKMAP_SIZE >> PAGE_SHIFT)
|
|
#define LAST_PKMAP_MASK (LAST_PKMAP - 1)
|
|
#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
|
|
#define PKMAP_NR(virt) (((virt) - PKMAP_BASE) >> PAGE_SHIFT)
|
|
|
|
#define kmap_prot PAGE_KERNEL
|
|
|
|
|
|
#include <asm/cacheflush.h>
|
|
|
|
extern void *kmap(struct page *page);
|
|
extern void *kmap_high(struct page *page);
|
|
extern void *kmap_atomic(struct page *page);
|
|
extern void __kunmap_atomic(void *kvaddr);
|
|
extern void kunmap_high(struct page *page);
|
|
|
|
extern void kmap_init(void);
|
|
|
|
static inline void flush_cache_kmaps(void)
|
|
{
|
|
flush_cache_all();
|
|
}
|
|
|
|
static inline void kunmap(struct page *page)
|
|
{
|
|
BUG_ON(in_interrupt());
|
|
if (!PageHighMem(page))
|
|
return;
|
|
kunmap_high(page);
|
|
}
|
|
|
|
|
|
#endif
|
|
|
|
#endif
|