cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

highmem.h (1741B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * highmem.h: virtual kernel memory mappings for high memory
      4 *
      5 * Used in CONFIG_HIGHMEM systems for memory pages which
      6 * are not addressable by direct kernel virtual addresses.
      7 *
      8 * Copyright (C) 1999 Gerhard Wichert, Siemens AG
      9 *		      Gerhard.Wichert@pdb.siemens.de
     10 *
     11 *
     12 * Redesigned the x86 32-bit VM architecture to deal with
     13 * up to 16 Terabyte physical memory. With current x86 CPUs
     14 * we now support up to 64 Gigabytes physical RAM.
     15 *
     16 * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
     17 */
     18#ifndef _ASM_HIGHMEM_H
     19#define _ASM_HIGHMEM_H
     20
     21#ifdef __KERNEL__
     22
     23#include <linux/bug.h>
     24#include <linux/interrupt.h>
     25#include <linux/uaccess.h>
     26#include <asm/cpu-features.h>
     27#include <asm/kmap_size.h>
     28
     29/* declarations for highmem.c */
     30extern unsigned long highstart_pfn, highend_pfn;
     31
     32extern pte_t *pkmap_page_table;
     33
     34/*
     35 * Right now we initialize only a single pte table. It can be extended
     36 * easily, subsequent pte tables have to be allocated in one physical
     37 * chunk of RAM.
     38 */
     39#if defined(CONFIG_PHYS_ADDR_T_64BIT) || defined(CONFIG_MIPS_HUGE_TLB_SUPPORT)
     40#define LAST_PKMAP 512
     41#else
     42#define LAST_PKMAP 1024
     43#endif
     44
     45#define LAST_PKMAP_MASK (LAST_PKMAP-1)
     46#define PKMAP_NR(virt)	((virt-PKMAP_BASE) >> PAGE_SHIFT)
     47#define PKMAP_ADDR(nr)	(PKMAP_BASE + ((nr) << PAGE_SHIFT))
     48
     49#define ARCH_HAS_KMAP_FLUSH_TLB
     50extern void kmap_flush_tlb(unsigned long addr);
     51
     52#define flush_cache_kmaps()	BUG_ON(cpu_has_dc_aliases)
     53
     54#define arch_kmap_local_set_pte(mm, vaddr, ptep, ptev)	set_pte(ptep, ptev)
     55#define arch_kmap_local_post_map(vaddr, pteval)	local_flush_tlb_one(vaddr)
     56#define arch_kmap_local_post_unmap(vaddr)	local_flush_tlb_one(vaddr)
     57
     58#endif /* __KERNEL__ */
     59
     60#endif /* _ASM_HIGHMEM_H */