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 (1800B)

      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/init.h>
     24#include <linux/interrupt.h>
     25#include <linux/uaccess.h>
     26#include <asm/fixmap.h>
     27
     28extern pte_t *pkmap_page_table;
     29
     30/*
     31 * Right now we initialize only a single pte table. It can be extended
     32 * easily, subsequent pte tables have to be allocated in one physical
     33 * chunk of RAM.
     34 */
     35/*
     36 * We use one full pte table with 4K pages. And with 16K/64K/256K pages pte
     37 * table covers enough memory (32MB/512MB/2GB resp.), so that both FIXMAP
     38 * and PKMAP can be placed in a single pte table. We use 512 pages for PKMAP
     39 * in case of 16K/64K/256K page sizes.
     40 */
     41
     42#define PKMAP_ORDER	PTE_SHIFT
     43#define LAST_PKMAP	(1 << PKMAP_ORDER)
     44
     45#define PKMAP_BASE	((FIXADDR_START - PAGE_SIZE * (LAST_PKMAP + 1)) \
     46								& PMD_MASK)
     47
     48#define LAST_PKMAP_MASK	(LAST_PKMAP - 1)
     49#define PKMAP_NR(virt)  ((virt - PKMAP_BASE) >> PAGE_SHIFT)
     50#define PKMAP_ADDR(nr)  (PKMAP_BASE + ((nr) << PAGE_SHIFT))
     51
     52#define flush_cache_kmaps()	{ flush_icache(); flush_dcache(); }
     53
     54#define arch_kmap_local_post_map(vaddr, pteval)	\
     55	local_flush_tlb_page(NULL, vaddr);
     56#define arch_kmap_local_post_unmap(vaddr)	\
     57	local_flush_tlb_page(NULL, vaddr);
     58
     59#endif /* __KERNEL__ */
     60
     61#endif /* _ASM_HIGHMEM_H */