arch/s390/include/asm/mmu.h

   1 #ifndef __MMU_H
   2 #define __MMU_H
   3
   4 #include <linux/errno.h>
   5
   6 typedef struct {
   7         atomic_t attach_count;
   8         unsigned int flush_mm;
   9         spinlock_t list_lock;
  10         struct list_head pgtable_list;
  11         struct list_head gmap_list;
  12         unsigned long asce_bits;
  13         unsigned long asce_limit;
  14         unsigned long vdso_base;
  15         /* Cloned contexts will be created with extended page tables. */
  16         unsigned int alloc_pgste:1;
  17         /* The mmu context has extended page tables. */
  18         unsigned int has_pgste:1;
  19 } mm_context_t;
  20
  21 #define INIT_MM_CONTEXT(name)                                                 \
  22         .context.list_lock    = __SPIN_LOCK_UNLOCKED(name.context.list_lock), \
  23         .context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list),    \
  24         .context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list),
  25
  26 static inline int tprot(unsigned long addr)
  27 {
  28         int rc = -EFAULT;
  29
  30         asm volatile(
  31                 "       tprot   0(%1),0\n"
  32                 "0:     ipm     %0\n"
  33                 "       srl     %0,28\n"
  34                 "1:\n"
  35                 EX_TABLE(0b,1b)
  36                 : "+d" (rc) : "a" (addr) : "cc");
  37         return rc;
  38 }
  39
  40 #endif