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 */ 68