arch/s390/include/asm/mmu.h

   1 #ifndef __MMU_H
   2 #define __MMU_H
   3
   4 #include <linux/cpumask.h>
   5 #include <linux/errno.h>
   6
   7 typedef struct {
   8         spinlock_t lock;
   9         cpumask_t cpu_attach_mask;
  10         atomic_t flush_count;
  11         unsigned int flush_mm;
  12         spinlock_t pgtable_lock;
  13         struct list_head pgtable_list;
  14         spinlock_t gmap_lock;
  15         struct list_head gmap_list;
  16         unsigned long gmap_asce;
  17         unsigned long asce;
  18         unsigned long asce_limit;
  19         unsigned long vdso_base;
  20         /* The mmu context allocates 4K page tables. */
  21         unsigned int alloc_pgste:1;
  22         /* The mmu context uses extended page tables. */
  23         unsigned int has_pgste:1;
  24         /* The mmu context uses storage keys. */
  25         unsigned int use_skey:1;
  26         /* The mmu context uses CMMA. */
  27         unsigned int use_cmma:1;
  28 } mm_context_t;
  29
  30 #define INIT_MM_CONTEXT(name)                                              \
  31         .context.lock = __SPIN_LOCK_UNLOCKED(name.context.lock),           \
  32         .context.pgtable_lock =                                            \
  33                         __SPIN_LOCK_UNLOCKED(name.context.pgtable_lock),   \
  34         .context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list), \
  35         .context.gmap_lock = __SPIN_LOCK_UNLOCKED(name.context.gmap_lock), \
  36         .context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list),
  37
  38 static inline int tprot(unsigned long addr)
  39 {
  40         int rc = -EFAULT;
  41
  42         asm volatile(
  43                 "       tprot   0(%1),0\n"
  44                 "0:     ipm     %0\n"
  45                 "       srl     %0,28\n"
  46                 "1:\n"
  47                 EX_TABLE(0b,1b)
  48                 : "+d" (rc) : "a" (addr) : "cc");
  49         return rc;
  50 }
  51
  52 #endif