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         cpumask_t cpu_attach_mask;
   9         atomic_t attach_count;
  10         unsigned int flush_mm;
  11         spinlock_t list_lock;
  12         struct list_head pgtable_list;
  13         struct list_head gmap_list;
  14         unsigned long asce_bits;
  15         unsigned long asce_limit;
  16         unsigned long vdso_base;
  17         /* The mmu context allocates 4K page tables. */
  18         unsigned int alloc_pgste:1;
  19         /* The mmu context uses extended page tables. */
  20         unsigned int has_pgste:1;
  21         /* The mmu context uses storage keys. */
  22         unsigned int use_skey:1;
  23 } mm_context_t;
  24
  25 #define INIT_MM_CONTEXT(name)                                                 \
  26         .context.list_lock    = __SPIN_LOCK_UNLOCKED(name.context.list_lock), \
  27         .context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list),    \
  28         .context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list),
  29
  30 static inline int tprot(unsigned long addr)
  31 {
  32         int rc = -EFAULT;
  33
  34         asm volatile(
  35                 "       tprot   0(%1),0\n"
  36                 "0:     ipm     %0\n"
  37                 "       srl     %0,28\n"
  38                 "1:\n"
  39                 EX_TABLE(0b,1b)
  40                 : "+d" (rc) : "a" (addr) : "cc");
  41         return rc;
  42 }
  43
  44 #endif