66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
// Copyright (C) 2005-2017 Andes Technology Corporation
|
||
|
|
|
||
|
|
#ifndef _ASM_HIGHMEM_H
|
||
|
|
#define _ASM_HIGHMEM_H
|
||
|
|
|
||
|
|
#include <asm/proc-fns.h>
|
||
|
|
#include <asm/kmap_types.h>
|
||
|
|
#include <asm/fixmap.h>
|
||
|
|
#include <asm/pgtable.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 - PGDIR_SIZE) & (PGDIR_MASK))
|
||
|
|
#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)
|
||
|
|
{
|
||
|
|
cpu_dcache_wbinval_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);
|
||
|
|
extern struct page *kmap_atomic_to_page(void *ptr);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif
|