cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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highmem.h (1966B)

      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 Terrabyte 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
     19#ifndef _ASM_HIGHMEM_H
     20#define _ASM_HIGHMEM_H
     21
     22#ifdef __KERNEL__
     23
     24#include <linux/interrupt.h>
     25#include <linux/pgtable.h>
     26#include <asm/vaddrs.h>
     27#include <asm/pgtsrmmu.h>
     28
     29/* declarations for highmem.c */
     30extern unsigned long highstart_pfn, highend_pfn;
     31
     32#define kmap_prot __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE)
     33extern pte_t *pkmap_page_table;
     34
     35/*
     36 * Right now we initialize only a single pte table. It can be extended
     37 * easily, subsequent pte tables have to be allocated in one physical
     38 * chunk of RAM.  Currently the simplest way to do this is to align the
     39 * pkmap region on a pagetable boundary (4MB).
     40 */
     41#define LAST_PKMAP 1024
     42#define PKMAP_SIZE (LAST_PKMAP << PAGE_SHIFT)
     43#define PKMAP_BASE PMD_ALIGN(SRMMU_NOCACHE_VADDR + (SRMMU_MAX_NOCACHE_PAGES << PAGE_SHIFT))
     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 PKMAP_END (PKMAP_ADDR(LAST_PKMAP))
     50
     51#define flush_cache_kmaps()	flush_cache_all()
     52
     53/* FIXME: Use __flush_*_one(vaddr) instead of flush_*_all() -- Anton */
     54#define arch_kmap_local_pre_map(vaddr, pteval)	flush_cache_all()
     55#define arch_kmap_local_pre_unmap(vaddr)	flush_cache_all()
     56#define arch_kmap_local_post_map(vaddr, pteval)	flush_tlb_all()
     57#define arch_kmap_local_post_unmap(vaddr)	flush_tlb_all()
     58
     59#endif /* __KERNEL__ */
     60
     61#endif /* _ASM_HIGHMEM_H */