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/mutex.h>
   7 #include <linux/atomic.h>
   8
   9 /*
  10  * x86 has arch-specific MMU state beyond what lives in mm_struct.
  11  */
  12 typedef struct {
  13         /*
  14          * ctx_id uniquely identifies this mm_struct.  A ctx_id will never
  15          * be reused, and zero is not a valid ctx_id.
  16          */
  17         u64 ctx_id;
  18
  19         /*
  20          * Any code that needs to do any sort of TLB flushing for this
  21          * mm will first make its changes to the page tables, then
  22          * increment tlb_gen, then flush.  This lets the low-level
  23          * flushing code keep track of what needs flushing.
  24          *
  25          * This is not used on Xen PV.
  26          */
  27         atomic64_t tlb_gen;
  28
  29 #ifdef CONFIG_MODIFY_LDT_SYSCALL
  30         struct ldt_struct *ldt;
  31 #endif
  32
  33 #ifdef CONFIG_X86_64
  34         /* True if mm supports a task running in 32 bit compatibility mode. */
  35         unsigned short ia32_compat;
  36 #endif
  37
  38         struct mutex lock;
  39         void __user *vdso;                      /* vdso base address */
  40         const struct vdso_image *vdso_image;    /* vdso image in use */
  41
  42         atomic_t perf_rdpmc_allowed;    /* nonzero if rdpmc is allowed */
  43 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
  44         /*
  45          * One bit per protection key says whether userspace can
  46          * use it or not.  protected by mmap_sem.
  47          */
  48         u16 pkey_allocation_map;
  49         s16 execute_only_pkey;
  50 #endif
  51 #ifdef CONFIG_X86_INTEL_MPX
  52         /* address of the bounds directory */
  53         void __user *bd_addr;
  54 #endif
  55 } mm_context_t;
  56
  57 #define INIT_MM_CONTEXT(mm)                                             \
  58         .context = {                                                    \
  59                 .ctx_id = 1,                                            \
  60         }
  61
  62 void leave_mm(int cpu);
  63
  64 #endif /* _ASM_X86_MMU_H */