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 (3099B)

      1/*
      2 * fixmap.h: compile-time virtual memory allocation
      3 *
      4 * This file is subject to the terms and conditions of the GNU General Public
      5 * License.  See the file "COPYING" in the main directory of this archive
      6 * for more details.
      7 *
      8 * Copyright (C) 1998 Ingo Molnar
      9 * Copyright (C) 2013 Mark Salter <msalter@redhat.com>
     10 *
     11 * Adapted from arch/x86 version.
     12 *
     13 */
     14
     15#ifndef _ASM_ARM64_FIXMAP_H
     16#define _ASM_ARM64_FIXMAP_H
     17
     18#ifndef __ASSEMBLY__
     19#include <linux/kernel.h>
     20#include <linux/sizes.h>
     21#include <asm/boot.h>
     22#include <asm/page.h>
     23#include <asm/pgtable-prot.h>
     24
     25/*
     26 * Here we define all the compile-time 'special' virtual
     27 * addresses. The point is to have a constant address at
     28 * compile time, but to set the physical address only
     29 * in the boot process.
     30 *
     31 * Each enum increment in these 'compile-time allocated'
     32 * memory buffers is page-sized. Use set_fixmap(idx,phys)
     33 * to associate physical memory with a fixmap index.
     34 */
     35enum fixed_addresses {
     36	FIX_HOLE,
     37
     38	/*
     39	 * Reserve a virtual window for the FDT that is 2 MB larger than the
     40	 * maximum supported size, and put it at the top of the fixmap region.
     41	 * The additional space ensures that any FDT that does not exceed
     42	 * MAX_FDT_SIZE can be mapped regardless of whether it crosses any
     43	 * 2 MB alignment boundaries.
     44	 *
     45	 * Keep this at the top so it remains 2 MB aligned.
     46	 */
     47#define FIX_FDT_SIZE		(MAX_FDT_SIZE + SZ_2M)
     48	FIX_FDT_END,
     49	FIX_FDT = FIX_FDT_END + FIX_FDT_SIZE / PAGE_SIZE - 1,
     50
     51	FIX_EARLYCON_MEM_BASE,
     52	FIX_TEXT_POKE0,
     53
     54#ifdef CONFIG_ACPI_APEI_GHES
     55	/* Used for GHES mapping from assorted contexts */
     56	FIX_APEI_GHES_IRQ,
     57	FIX_APEI_GHES_SEA,
     58#ifdef CONFIG_ARM_SDE_INTERFACE
     59	FIX_APEI_GHES_SDEI_NORMAL,
     60	FIX_APEI_GHES_SDEI_CRITICAL,
     61#endif
     62#endif /* CONFIG_ACPI_APEI_GHES */
     63
     64#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
     65	FIX_ENTRY_TRAMP_TEXT3,
     66	FIX_ENTRY_TRAMP_TEXT2,
     67	FIX_ENTRY_TRAMP_TEXT1,
     68	FIX_ENTRY_TRAMP_DATA,
     69#define TRAMP_VALIAS		(__fix_to_virt(FIX_ENTRY_TRAMP_TEXT1))
     70#endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */
     71	__end_of_permanent_fixed_addresses,
     72
     73	/*
     74	 * Temporary boot-time mappings, used by early_ioremap(),
     75	 * before ioremap() is functional.
     76	 */
     77#define NR_FIX_BTMAPS		(SZ_256K / PAGE_SIZE)
     78#define FIX_BTMAPS_SLOTS	7
     79#define TOTAL_FIX_BTMAPS	(NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
     80
     81	FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
     82	FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
     83
     84	/*
     85	 * Used for kernel page table creation, so unmapped memory may be used
     86	 * for tables.
     87	 */
     88	FIX_PTE,
     89	FIX_PMD,
     90	FIX_PUD,
     91	FIX_PGD,
     92
     93	__end_of_fixed_addresses
     94};
     95
     96#define FIXADDR_SIZE	(__end_of_permanent_fixed_addresses << PAGE_SHIFT)
     97#define FIXADDR_START	(FIXADDR_TOP - FIXADDR_SIZE)
     98
     99#define FIXMAP_PAGE_IO     __pgprot(PROT_DEVICE_nGnRE)
    100
    101void __init early_fixmap_init(void);
    102
    103#define __early_set_fixmap __set_fixmap
    104
    105#define __late_set_fixmap __set_fixmap
    106#define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR)
    107
    108extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);
    109
    110#include <asm-generic/fixmap.h>
    111
    112#endif /* !__ASSEMBLY__ */
    113#endif /* _ASM_ARM64_FIXMAP_H */