linux/arch/x86/include/asm/mmu_context.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_MMU_CONTEXT_H
#define _ASM_X86_MMU_CONTEXT_H

#include <asm/desc.h>
#include <linux/atomic.h>
#include <linux/mm_types.h>
#include <linux/pkeys.h>

#include <trace/events/tlb.h>

#include <asm/tlbflush.h>
#include <asm/paravirt.h>
#include <asm/debugreg.h>
#include <asm/gsseg.h>

extern atomic64_t last_mm_ctx_id;

#ifdef CONFIG_PERF_EVENTS
DECLARE_STATIC_KEY_FALSE(rdpmc_never_available_key);
DECLARE_STATIC_KEY_FALSE(rdpmc_always_available_key);
void cr4_update_pce(void *ignored);
#endif

#ifdef CONFIG_MODIFY_LDT_SYSCALL
/*
 * ldt_structs can be allocated, used, and freed, but they are never
 * modified while live.
 */
struct ldt_struct { … };

/*
 * Used for LDT copy/destruction.
 */
static inline void init_new_context_ldt(struct mm_struct *mm)
{ … }
int ldt_dup_context(struct mm_struct *oldmm, struct mm_struct *mm);
void destroy_context_ldt(struct mm_struct *mm);
void ldt_arch_exit_mmap(struct mm_struct *mm);
#else	/* CONFIG_MODIFY_LDT_SYSCALL */
static inline void init_new_context_ldt(struct mm_struct *mm) { }
static inline int ldt_dup_context(struct mm_struct *oldmm,
				  struct mm_struct *mm)
{
	return 0;
}
static inline void destroy_context_ldt(struct mm_struct *mm) { }
static inline void ldt_arch_exit_mmap(struct mm_struct *mm) { }
#endif

#ifdef CONFIG_MODIFY_LDT_SYSCALL
extern void load_mm_ldt(struct mm_struct *mm);
extern void switch_ldt(struct mm_struct *prev, struct mm_struct *next);
#else
static inline void load_mm_ldt(struct mm_struct *mm)
{
	clear_LDT();
}
static inline void switch_ldt(struct mm_struct *prev, struct mm_struct *next)
{
	DEBUG_LOCKS_WARN_ON(preemptible());
}
#endif

#ifdef CONFIG_ADDRESS_MASKING
static inline unsigned long mm_lam_cr3_mask(struct mm_struct *mm)
{ … }

static inline void dup_lam(struct mm_struct *oldmm, struct mm_struct *mm)
{ … }

#define mm_untag_mask …
static inline unsigned long mm_untag_mask(struct mm_struct *mm)
{ … }

static inline void mm_reset_untag_mask(struct mm_struct *mm)
{ … }

#define arch_pgtable_dma_compat …
static inline bool arch_pgtable_dma_compat(struct mm_struct *mm)
{ … }
#else

static inline unsigned long mm_lam_cr3_mask(struct mm_struct *mm)
{
	return 0;
}

static inline void dup_lam(struct mm_struct *oldmm, struct mm_struct *mm)
{
}

static inline void mm_reset_untag_mask(struct mm_struct *mm)
{
}
#endif

#define enter_lazy_tlb …
extern void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk);

/*
 * Init a new mm.  Used on mm copies, like at fork()
 * and on mm's that are brand-new, like at execve().
 */
#define init_new_context …
static inline int init_new_context(struct task_struct *tsk,
				   struct mm_struct *mm)
{ … }

#define destroy_context …
static inline void destroy_context(struct mm_struct *mm)
{ … }

extern void switch_mm(struct mm_struct *prev, struct mm_struct *next,
		      struct task_struct *tsk);

extern void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
			       struct task_struct *tsk);
#define switch_mm_irqs_off …

#define activate_mm(prev, next) …

#ifdef CONFIG_X86_32
#define deactivate_mm …
#else
#define deactivate_mm(tsk, mm) …
#endif

static inline void arch_dup_pkeys(struct mm_struct *oldmm,
				  struct mm_struct *mm)
{ … }

static inline int arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
{ … }

static inline void arch_exit_mmap(struct mm_struct *mm)
{ … }

#ifdef CONFIG_X86_64
static inline bool is_64bit_mm(struct mm_struct *mm)
{ … }
#else
static inline bool is_64bit_mm(struct mm_struct *mm)
{
	return false;
}
#endif

static inline void arch_unmap(struct mm_struct *mm, unsigned long start,
			      unsigned long end)
{ … }

/*
 * We only want to enforce protection keys on the current process
 * because we effectively have no access to PKRU for other
 * processes or any way to tell *which * PKRU in a threaded
 * process we could use.
 *
 * So do not enforce things if the VMA is not from the current
 * mm, or if we are in a kernel thread.
 */
static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
		bool write, bool execute, bool foreign)
{ … }

unsigned long __get_current_cr3_fast(void);

#include <asm-generic/mmu_context.h>

#endif /* _ASM_X86_MMU_CONTEXT_H */