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 (2079B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * highmem.h: virtual kernel memory mappings for high memory
      4 *
      5 * PowerPC version, stolen from the i386 version.
      6 *
      7 * Used in CONFIG_HIGHMEM systems for memory pages which
      8 * are not addressable by direct kernel virtual addresses.
      9 *
     10 * Copyright (C) 1999 Gerhard Wichert, Siemens AG
     11 *		      Gerhard.Wichert@pdb.siemens.de
     12 *
     13 *
     14 * Redesigned the x86 32-bit VM architecture to deal with
     15 * up to 16 Terrabyte physical memory. With current x86 CPUs
     16 * we now support up to 64 Gigabytes physical RAM.
     17 *
     18 * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
     19 */
     20
     21#ifndef _ASM_HIGHMEM_H
     22#define _ASM_HIGHMEM_H
     23
     24#ifdef __KERNEL__
     25
     26#include <linux/interrupt.h>
     27#include <asm/cacheflush.h>
     28#include <asm/page.h>
     29#include <asm/fixmap.h>
     30
     31extern pte_t *pkmap_page_table;
     32
     33/*
     34 * Right now we initialize only a single pte table. It can be extended
     35 * easily, subsequent pte tables have to be allocated in one physical
     36 * chunk of RAM.
     37 */
     38/*
     39 * We use one full pte table with 4K pages. And with 16K/64K/256K pages pte
     40 * table covers enough memory (32MB/512MB/2GB resp.), so that both FIXMAP
     41 * and PKMAP can be placed in a single pte table. We use 512 pages for PKMAP
     42 * in case of 16K/64K/256K page sizes.
     43 */
     44#ifdef CONFIG_PPC_4K_PAGES
     45#define PKMAP_ORDER	PTE_SHIFT
     46#else
     47#define PKMAP_ORDER	9
     48#endif
     49#define LAST_PKMAP	(1 << PKMAP_ORDER)
     50#ifndef CONFIG_PPC_4K_PAGES
     51#define PKMAP_BASE	(FIXADDR_START - PAGE_SIZE*(LAST_PKMAP + 1))
     52#else
     53#define PKMAP_BASE	((FIXADDR_START - PAGE_SIZE*(LAST_PKMAP + 1)) & PMD_MASK)
     54#endif
     55#define LAST_PKMAP_MASK	(LAST_PKMAP-1)
     56#define PKMAP_NR(virt)  ((virt-PKMAP_BASE) >> PAGE_SHIFT)
     57#define PKMAP_ADDR(nr)  (PKMAP_BASE + ((nr) << PAGE_SHIFT))
     58
     59#define flush_cache_kmaps()	flush_cache_all()
     60
     61#define arch_kmap_local_set_pte(mm, vaddr, ptep, ptev)	\
     62	__set_pte_at(mm, vaddr, ptep, ptev, 1)
     63#define arch_kmap_local_post_map(vaddr, pteval)	\
     64	local_flush_tlb_page(NULL, vaddr)
     65#define arch_kmap_local_post_unmap(vaddr)	\
     66	local_flush_tlb_page(NULL, vaddr)
     67
     68#endif /* __KERNEL__ */
     69
     70#endif /* _ASM_HIGHMEM_H */