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