arch/x86/include/asm/mmu.h

   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  BIT(0)
  13 /* vsyscall page is accessible on this MM */
  14 #define MM_CONTEXT_HAS_VSYSCALL BIT(1)
  15
  16 /*
  17  * x86 has arch-specific MMU state beyond what lives in mm_struct.
  18  */
  19 typedef struct {
  20         /*
  21          * ctx_id uniquely identifies this mm_struct.  A ctx_id will never
  22          * be reused, and zero is not a valid ctx_id.
  23          */
  24         u64 ctx_id;
  25
  26         /*
  27          * Any code that needs to do any sort of TLB flushing for this
  28          * mm will first make its changes to the page tables, then
  29          * increment tlb_gen, then flush.  This lets the low-level
  30          * flushing code keep track of what needs flushing.
  31          *
  32          * This is not used on Xen PV.
  33          */
  34         atomic64_t tlb_gen;
  35
  36 #ifdef CONFIG_MODIFY_LDT_SYSCALL
  37         struct rw_semaphore     ldt_usr_sem;
  38         struct ldt_struct       *ldt;
  39 #endif
  40
  41 #ifdef CONFIG_X86_64
  42         unsigned short flags;
  43 #endif
  44
  45         struct mutex lock;
  46         void __user *vdso;                      /* vdso base address */
  47         const struct vdso_image *vdso_image;    /* vdso image in use */
  48
  49         atomic_t perf_rdpmc_allowed;    /* nonzero if rdpmc is allowed */
  50 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
  51         /*
  52          * One bit per protection key says whether userspace can
  53          * use it or not.  protected by mmap_lock.
  54          */
  55         u16 pkey_allocation_map;
  56         s16 execute_only_pkey;
  57 #endif
  58 } mm_context_t;
  59
  60 #define INIT_MM_CONTEXT(mm)                                             \
  61         .context = {                                                    \
  62                 .ctx_id = 1,                                            \
  63                 .lock = __MUTEX_INITIALIZER(mm.context.lock),           \
  64         }
  65
  66 void leave_mm(int cpu);
  67 #define leave_mm leave_mm
  68
  69 #endif /* _ASM_X86_MMU_H */