1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_MMU_H
3#define _ASM_X86_MMU_H
4
5#include <linux/spinlock.h>
6#include <linux/rwsem.h>
7#include <linux/mutex.h>
8#include <linux/atomic.h>
9#include <linux/bits.h>
10
11/* Uprobes on this MM assume 32-bit code */
12#define MM_CONTEXT_UPROBE_IA32 0
13/* vsyscall page is accessible on this MM */
14#define MM_CONTEXT_HAS_VSYSCALL 1
15/* Do not allow changing LAM mode */
16#define MM_CONTEXT_LOCK_LAM 2
17/* Allow LAM and SVA coexisting */
18#define MM_CONTEXT_FORCE_TAGGED_SVA 3
19
20/*
21 * x86 has arch-specific MMU state beyond what lives in mm_struct.
22 */
23typedef struct {
24 /*
25 * ctx_id uniquely identifies this mm_struct. A ctx_id will never
26 * be reused, and zero is not a valid ctx_id.
27 */
28 u64 ctx_id;
29
30 /*
31 * Any code that needs to do any sort of TLB flushing for this
32 * mm will first make its changes to the page tables, then
33 * increment tlb_gen, then flush. This lets the low-level
34 * flushing code keep track of what needs flushing.
35 *
36 * This is not used on Xen PV.
37 */
38 atomic64_t tlb_gen;
39
40#ifdef CONFIG_MODIFY_LDT_SYSCALL
41 struct rw_semaphore ldt_usr_sem;
42 struct ldt_struct *ldt;
43#endif
44
45#ifdef CONFIG_X86_64
46 unsigned long flags;
47#endif
48
49#ifdef CONFIG_ADDRESS_MASKING
50 /* Active LAM mode: X86_CR3_LAM_U48 or X86_CR3_LAM_U57 or 0 (disabled) */
51 unsigned long lam_cr3_mask;
52
53 /* Significant bits of the virtual address. Excludes tag bits. */
54 u64 untag_mask;
55#endif
56
57 struct mutex lock;
58 void __user *vdso; /* vdso base address */
59 const struct vdso_image *vdso_image; /* vdso image in use */
60
61 atomic_t perf_rdpmc_allowed; /* nonzero if rdpmc is allowed */
62#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
63 /*
64 * One bit per protection key says whether userspace can
65 * use it or not. protected by mmap_lock.
66 */
67 u16 pkey_allocation_map;
68 s16 execute_only_pkey;
69#endif
70} mm_context_t;
71
72#define INIT_MM_CONTEXT(mm) \
73 .context = { \
74 .ctx_id = 1, \
75 .lock = __MUTEX_INITIALIZER(mm.context.lock), \
76 }
77
78void leave_mm(void);
79#define leave_mm leave_mm
80
81#endif /* _ASM_X86_MMU_H */
82

source code of linux/arch/x86/include/asm/mmu.h