| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _ASM_X86_MMU_H |
| #define _ASM_X86_MMU_H |
| |
| #include <linux/spinlock.h> |
| #include <linux/rwsem.h> |
| #include <linux/mutex.h> |
| #include <linux/atomic.h> |
| |
| /* |
| * x86 has arch-specific MMU state beyond what lives in mm_struct. |
| */ |
| typedef struct { |
| /* |
| * ctx_id uniquely identifies this mm_struct. A ctx_id will never |
| * be reused, and zero is not a valid ctx_id. |
| */ |
| u64 ctx_id; |
| |
| /* |
| * Any code that needs to do any sort of TLB flushing for this |
| * mm will first make its changes to the page tables, then |
| * increment tlb_gen, then flush. This lets the low-level |
| * flushing code keep track of what needs flushing. |
| * |
| * This is not used on Xen PV. |
| */ |
| atomic64_t tlb_gen; |
| |
| #ifdef CONFIG_MODIFY_LDT_SYSCALL |
| struct rw_semaphore ldt_usr_sem; |
| struct ldt_struct *ldt; |
| #endif |
| |
| #ifdef CONFIG_X86_64 |
| /* True if mm supports a task running in 32 bit compatibility mode. */ |
| unsigned short ia32_compat; |
| #endif |
| |
| struct mutex lock; |
| void __user *vdso; /* vdso base address */ |
| const struct vdso_image *vdso_image; /* vdso image in use */ |
| |
| atomic_t perf_rdpmc_allowed; /* nonzero if rdpmc is allowed */ |
| #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS |
| /* |
| * One bit per protection key says whether userspace can |
| * use it or not. protected by mmap_lock. |
| */ |
| u16 pkey_allocation_map; |
| s16 execute_only_pkey; |
| #endif |
| } mm_context_t; |
| |
| #define INIT_MM_CONTEXT(mm) \ |
| .context = { \ |
| .ctx_id = 1, \ |
| .lock = __MUTEX_INITIALIZER(mm.context.lock), \ |
| } |
| |
| void leave_mm(int cpu); |
| |
| #endif /* _ASM_X86_MMU_H */ |