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 (2497B)

      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
     19#ifndef _ASM_X86_HIGHMEM_H
     20#define _ASM_X86_HIGHMEM_H
     21
     22#ifdef __KERNEL__
     23
     24#include <linux/interrupt.h>
     25#include <linux/threads.h>
     26#include <asm/tlbflush.h>
     27#include <asm/paravirt.h>
     28#include <asm/fixmap.h>
     29#include <asm/pgtable_areas.h>
     30
     31/* declarations for highmem.c */
     32extern unsigned long highstart_pfn, highend_pfn;
     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/*
     40 * Ordering is:
     41 *
     42 * high memory on:			              high_memory off:
     43 *    FIXADDR_TOP                                        FIXADDR_TOP
     44 *        fixed addresses                                    fixed addresses
     45 *    FIXADDR_START                                      FIXADDR_START
     46 *        temp fixed addresses/persistent kmap area      VMALLOC_END
     47 *    PKMAP_BASE                                             temp fixed addresses/vmalloc area
     48 *    VMALLOC_END                                        VMALLOC_START
     49 *        vmalloc area                                   high_memory
     50 *    VMALLOC_START
     51 *    high_memory
     52 *
     53 * The temp fixed area is only used during boot for early_ioremap(), and
     54 * it is unused when the ioremap() is functional. vmalloc/pkmap area become
     55 * available after early boot so the temp fixed area is available for re-use.
     56 */
     57#define LAST_PKMAP_MASK (LAST_PKMAP-1)
     58#define PKMAP_NR(virt)  ((virt-PKMAP_BASE) >> PAGE_SHIFT)
     59#define PKMAP_ADDR(nr)  (PKMAP_BASE + ((nr) << PAGE_SHIFT))
     60
     61#define flush_cache_kmaps()	do { } while (0)
     62
     63#define	arch_kmap_local_post_map(vaddr, pteval)		\
     64	arch_flush_lazy_mmu_mode()
     65
     66#define	arch_kmap_local_post_unmap(vaddr)		\
     67	do {						\
     68		flush_tlb_one_kernel((vaddr));		\
     69		arch_flush_lazy_mmu_mode();		\
     70	} while (0)
     71
     72extern void add_highpages_with_active_regions(int nid, unsigned long start_pfn,
     73					unsigned long end_pfn);
     74
     75#endif /* __KERNEL__ */
     76
     77#endif /* _ASM_X86_HIGHMEM_H */