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Linux/arch/s390/include/asm/mmu.h

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  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         /*
 20          * The following bitfields need a down_write on the mm
 21          * semaphore when they are written to. As they are only
 22          * written once, they can be read without a lock.
 23          *
 24          * The mmu context allocates 4K page tables.
 25          */
 26         unsigned int alloc_pgste:1;
 27         /* The mmu context uses extended page tables. */
 28         unsigned int has_pgste:1;
 29         /* The mmu context uses storage keys. */
 30         unsigned int uses_skeys:1;
 31         /* The mmu context uses CMM. */
 32         unsigned int uses_cmm:1;
 33         /* The gmaps associated with this context are allowed to use huge pages. */
 34         unsigned int allow_gmap_hpage_1m:1;
 35         /* The mmu context is for compat task */
 36         unsigned int compat_mm: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
 59 

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