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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fixmap.h (1874B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * fixmap.h: compile-time virtual memory allocation
      4 *
      5 * Copyright (C) 1998 Ingo Molnar
      6 *
      7 * Copyright 2008 Freescale Semiconductor Inc.
      8 *   Port to powerpc added by Kumar Gala
      9 *
     10 * Copyright 2011 Michal Simek <monstr@monstr.eu>
     11 * Copyright 2011 PetaLogix Qld Pty Ltd
     12 *   Port to Microblaze
     13 */
     14
     15#ifndef _ASM_FIXMAP_H
     16#define _ASM_FIXMAP_H
     17
     18#ifndef __ASSEMBLY__
     19#include <linux/kernel.h>
     20#include <asm/page.h>
     21#ifdef CONFIG_HIGHMEM
     22#include <linux/threads.h>
     23#include <asm/kmap_size.h>
     24#endif
     25
     26#define FIXADDR_TOP	((unsigned long)(-PAGE_SIZE))
     27
     28/*
     29 * Here we define all the compile-time 'special' virtual
     30 * addresses. The point is to have a constant address at
     31 * compile time, but to set the physical address only
     32 * in the boot process. We allocate these special addresses
     33 * from the end of virtual memory (0xfffff000) backwards.
     34 * Also this lets us do fail-safe vmalloc(), we
     35 * can guarantee that these special addresses and
     36 * vmalloc()-ed addresses never overlap.
     37 *
     38 * these 'compile-time allocated' memory buffers are
     39 * fixed-size 4k pages. (or larger if used with an increment
     40 * highger than 1) use fixmap_set(idx,phys) to associate
     41 * physical memory with fixmap indices.
     42 *
     43 * TLB entries of such buffers will not be flushed across
     44 * task switches.
     45 */
     46enum fixed_addresses {
     47	FIX_HOLE,
     48#ifdef CONFIG_HIGHMEM
     49	FIX_KMAP_BEGIN,	/* reserved pte's for temporary kernel mappings */
     50	FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * num_possible_cpus()) - 1,
     51#endif
     52	__end_of_fixed_addresses
     53};
     54
     55extern void __set_fixmap(enum fixed_addresses idx,
     56					phys_addr_t phys, pgprot_t flags);
     57
     58#define __FIXADDR_SIZE	(__end_of_fixed_addresses << PAGE_SHIFT)
     59#define FIXADDR_START		(FIXADDR_TOP - __FIXADDR_SIZE)
     60
     61#define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_CI
     62
     63#include <asm-generic/fixmap.h>
     64
     65#endif /* !__ASSEMBLY__ */
     66#endif