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
10 /*
11 * x86 has arch-specific MMU state beyond what lives in mm_struct.
12 */
13 typedef struct {
14 /*
15 * ctx_id uniquely identifies this mm_struct. A ctx_id will never
16 * be reused, and zero is not a valid ctx_id.
17 */
18 u64 ctx_id;
19
20 /*
21 * Any code that needs to do any sort of TLB flushing for this
22 * mm will first make its changes to the page tables, then
23 * increment tlb_gen, then flush. This lets the low-level
24 * flushing code keep track of what needs flushing.
25 *
26 * This is not used on Xen PV.
27 */
28 atomic64_t tlb_gen;
29
30 #ifdef CONFIG_MODIFY_LDT_SYSCALL
31 struct rw_semaphore ldt_usr_sem;
32 struct ldt_struct *ldt;
33 #endif
34
35 #ifdef CONFIG_X86_64
36 /* True if mm supports a task running in 32 bit compatibility mode. */
37 unsigned short ia32_compat;
38 #endif
39
40 struct mutex lock;
41 void __user *vdso; /* vdso base address */
42 const struct vdso_image *vdso_image; /* vdso image in use */
43
44 atomic_t perf_rdpmc_allowed; /* nonzero if rdpmc is allowed */
45 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
46 /*
47 * One bit per protection key says whether userspace can
48 * use it or not. protected by mmap_sem.
49 */
50 u16 pkey_allocation_map;
51 s16 execute_only_pkey;
52 #endif
53 #ifdef CONFIG_X86_INTEL_MPX
54 /* address of the bounds directory */
55 void __user *bd_addr;
56 #endif
57 } mm_context_t;
58
59 #define INIT_MM_CONTEXT(mm) \
60 .context = { \
61 .ctx_id = 1, \
62 .lock = __MUTEX_INITIALIZER(mm.context.lock), \
63 }
64
65 void leave_mm(int cpu);
66
67 #endif /* _ASM_X86_MMU_H */