78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* highmem.h: virtual kernel memory mappings for high memory
|
|
*
|
|
* Used in CONFIG_HIGHMEM systems for memory pages which
|
|
* are not addressable by direct kernel virtual addresses.
|
|
*
|
|
* Copyright (C) 1999 Gerhard Wichert, Siemens AG
|
|
* Gerhard.Wichert@pdb.siemens.de
|
|
*
|
|
*
|
|
* Redesigned the x86 32-bit VM architecture to deal with
|
|
* up to 16 Terabyte physical memory. With current x86 CPUs
|
|
* we now support up to 64 Gigabytes physical RAM.
|
|
*
|
|
* Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
|
|
*/
|
|
|
|
#ifndef _ASM_X86_HIGHMEM_H
|
|
#define _ASM_X86_HIGHMEM_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/interrupt.h>
|
|
#include <linux/threads.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <asm/paravirt.h>
|
|
#include <asm/fixmap.h>
|
|
#include <asm/pgtable_areas.h>
|
|
|
|
/* declarations for highmem.c */
|
|
extern unsigned long highstart_pfn, highend_pfn;
|
|
|
|
/*
|
|
* 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:
|
|
*
|
|
* high memory on: high_memory off:
|
|
* FIXADDR_TOP FIXADDR_TOP
|
|
* fixed addresses fixed addresses
|
|
* FIXADDR_START FIXADDR_START
|
|
* temp fixed addresses/persistent kmap area VMALLOC_END
|
|
* PKMAP_BASE temp fixed addresses/vmalloc area
|
|
* VMALLOC_END VMALLOC_START
|
|
* vmalloc area high_memory
|
|
* VMALLOC_START
|
|
* high_memory
|
|
*
|
|
* The temp fixed area is only used during boot for early_ioremap(), and
|
|
* it is unused when the ioremap() is functional. vmalloc/pkmap area become
|
|
* available after early boot so the temp fixed area is available for re-use.
|
|
*/
|
|
#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 flush_cache_kmaps() do { } while (0)
|
|
|
|
#define arch_kmap_local_post_map(vaddr, pteval) \
|
|
arch_flush_lazy_mmu_mode()
|
|
|
|
#define arch_kmap_local_post_unmap(vaddr) \
|
|
do { \
|
|
flush_tlb_one_kernel((vaddr)); \
|
|
arch_flush_lazy_mmu_mode(); \
|
|
} while (0)
|
|
|
|
extern void add_highpages_with_active_regions(int nid, unsigned long start_pfn,
|
|
unsigned long end_pfn);
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _ASM_X86_HIGHMEM_H */
|