arch/s390/include/asm/mmu.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __MMU_H
   3 #define __MMU_H
   4
   5 #include <linux/cpumask.h>
   6 #include <linux/errno.h>
   7
   8 typedef struct {
   9         spinlock_t lock;
  10         cpumask_t cpu_attach_mask;
  11         atomic_t flush_count;
  12         unsigned int flush_mm;
  13         struct list_head pgtable_list;
  14         struct list_head gmap_list;
  15         unsigned long gmap_asce;
  16         unsigned long asce;
  17         unsigned long asce_limit;
  18         unsigned long vdso_base;
  19         /* The mmu context belongs to a secure guest. */
  20         atomic_t is_protected;
  21         /*
  22          * The following bitfields need a down_write on the mm
  23          * semaphore when they are written to. As they are only
  24          * written once, they can be read without a lock.
  25          *
  26          * The mmu context allocates 4K page tables.
  27          */
  28         unsigned int alloc_pgste:1;
  29         /* The mmu context uses extended page tables. */
  30         unsigned int has_pgste:1;
  31         /* The mmu context uses storage keys. */
  32         unsigned int uses_skeys:1;
  33         /* The mmu context uses CMM. */
  34         unsigned int uses_cmm:1;
  35         /* The gmaps associated with this context are allowed to use huge pages. */
  36         unsigned int allow_gmap_hpage_1m:1;
  37 } mm_context_t;
  38
  39 #define INIT_MM_CONTEXT(name)                                              \
  40         .context.lock = __SPIN_LOCK_UNLOCKED(name.context.lock),           \
  41         .context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list), \
  42         .context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list),
  43
  44 static inline int tprot(unsigned long addr)
  45 {
  46         int rc = -EFAULT;
  47
  48         asm volatile(
  49                 "       tprot   0(%1),0\n"
  50                 "0:     ipm     %0\n"
  51                 "       srl     %0,28\n"
  52                 "1:\n"
  53                 EX_TABLE(0b,1b)
  54                 : "+d" (rc) : "a" (addr) : "cc");
  55         return rc;
  56 }
  57
  58 #endif