LXR linux/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 */
  19typedef 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
  66void leave_mm(int cpu);
  67#define leave_mm leave_mm
  68
  69#endif /* _ASM_X86_MMU_H */
  70