Current File : //lib/modules/3.10.0-1160.81.1.el7.centos.plus.x86_64/source/arch/x86/include/asm/kaiser.h
#ifndef _ASM_X86_KAISER_H
#define _ASM_X86_KAISER_H
/*
* Copyright(c) 2017 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* Based on work published here: https://github.com/IAIK/KAISER
* Modified by Dave Hansen <dave.hansen@intel.com to actually work.
*/
#define KAISER_SHADOW_PCID_ASID 1
#define KAISER_PCP_ENABLED (1<<0)
#define KAISER_PCP_PCID (1<<1)
#ifndef __ASSEMBLY__
#ifdef CONFIG_PAGE_TABLE_ISOLATION
#include <linux/percpu.h>
/**
* kaiser_add_mapping - map a kernel range into the user page tables
* @addr: the start address of the range
* @size: the size of the range
* @flags: The mapping flags of the pages
*
* Use this on all data and code that need to be mapped into both
* copies of the page tables. This includes the code that switches
* to/from userspace and all of the hardware structures that are
* virtually-addressed and needed in userspace like the interrupt
* table.
*/
extern int kaiser_add_mapping(unsigned long addr, unsigned long size,
pteval_t flags);
/**
* kaiser_add_mapping_cpu_entry - map the cpu entry area
* @cpu: the CPU for which the entry area is being mapped
*/
extern void kaiser_add_mapping_cpu_entry(int cpu);
/**
* kaiser_remove_mapping - remove a kernel mapping from the userpage tables
* @addr: the start address of the range
* @size: the size of the range
*/
extern void kaiser_remove_mapping(unsigned long start, unsigned long size);
/**
* kaiser_init - Initialize the shadow mapping
*
* Most parts of the shadow mapping can be mapped upon boot
* time. Only per-process things like the thread stacks
* or a new LDT have to be mapped at runtime. These boot-
* time mappings are permanent and never unmapped.
*/
extern void kaiser_init(void);
extern bool is_kaiser_pgd(pgd_t *pgd);
extern int kaiser_enabled;
static __always_inline bool kaiser_active(void)
{
return __this_cpu_read(kaiser_enabled_pcp);
}
#else
static inline void kaiser_add_mapping_cpu_entry(int cpu) {}
#endif
#endif /* __ASSEMBLY__ */
#endif /* _ASM_X86_KAISER_H */
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