forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
60 lines
1.7 KiB
60 lines
1.7 KiB
/* 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 |
|
* [email protected] |
|
* |
|
* |
|
* 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 <[email protected]> |
|
*/ |
|
#ifndef _ASM_HIGHMEM_H |
|
#define _ASM_HIGHMEM_H |
|
|
|
#ifdef __KERNEL__ |
|
|
|
#include <linux/bug.h> |
|
#include <linux/interrupt.h> |
|
#include <linux/uaccess.h> |
|
#include <asm/cpu-features.h> |
|
#include <asm/kmap_size.h> |
|
|
|
/* declarations for highmem.c */ |
|
extern unsigned long highstart_pfn, highend_pfn; |
|
|
|
extern pte_t *pkmap_page_table; |
|
|
|
/* |
|
* 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. |
|
*/ |
|
#ifdef CONFIG_PHYS_ADDR_T_64BIT |
|
#define LAST_PKMAP 512 |
|
#else |
|
#define LAST_PKMAP 1024 |
|
#endif |
|
|
|
#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 ARCH_HAS_KMAP_FLUSH_TLB |
|
extern void kmap_flush_tlb(unsigned long addr); |
|
|
|
#define flush_cache_kmaps() BUG_ON(cpu_has_dc_aliases) |
|
|
|
#define arch_kmap_local_set_pte(mm, vaddr, ptep, ptev) set_pte(ptep, ptev) |
|
#define arch_kmap_local_post_map(vaddr, pteval) local_flush_tlb_one(vaddr) |
|
#define arch_kmap_local_post_unmap(vaddr) local_flush_tlb_one(vaddr) |
|
|
|
#endif /* __KERNEL__ */ |
|
|
|
#endif /* _ASM_HIGHMEM_H */
|
|
|