https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 08895a8b6b06ed2323cd97a36ee40a116b3db8ed authored by Linus Torvalds on 26 September 2016, 01:47:13 UTC
Linux 4.8-rc8
Linux 4.8-rc8
Tip revision: 08895a8
highmem.h
#ifndef _ASM_HIGHMEM_H
#define _ASM_HIGHMEM_H
#include <asm/cacheflush.h>
#include <asm/kmap_types.h>
#include <asm/fixmap.h>
/*
* Right now we initialize only a single pte table. It can be extended
* easily, subsequent pte tables have to be allocated in one physical
* chunk of RAM.
*/
/*
* Ordering is (from lower to higher memory addresses):
*
* high_memory
* Persistent kmap area
* PKMAP_BASE
* fixed_addresses
* FIXADDR_START
* FIXADDR_TOP
* Vmalloc area
* VMALLOC_START
* VMALLOC_END
*/
#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
static inline void flush_cache_kmaps(void)
{
flush_cache_all();
}
/* declarations for highmem.c */
extern unsigned long highstart_pfn, highend_pfn;
extern pte_t *pkmap_page_table;
extern void *kmap_high(struct page *page);
extern void kunmap_high(struct page *page);
extern void kmap_init(void);
/*
* 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);
#endif
#endif