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 #include <asm/asm-extable.h> 8 9 typedef struct { 10 spinlock_t lock; 11 cpumask_t cpu_attach_mask; 12 atomic_t flush_count; 13 unsigned int flush_mm; 14 struct list_head pgtable_list; 15 struct list_head gmap_list; 16 unsigned long gmap_asce; 17 unsigned long asce; 18 unsigned long asce_limit; 19 unsigned long vdso_base; 20 /* The mmu context belongs to a secure guest. */ 21 atomic_t is_protected; 22 /* 23 * The following bitfields need a down_write on the mm 24 * semaphore when they are written to. As they are only 25 * written once, they can be read without a lock. 26 * 27 * The mmu context allocates 4K page tables. 28 */ 29 unsigned int alloc_pgste:1; 30 /* The mmu context uses extended page tables. */ 31 unsigned int has_pgste:1; 32 /* The mmu context uses storage keys. */ 33 unsigned int uses_skeys:1; 34 /* The mmu context uses CMM. */ 35 unsigned int uses_cmm:1; 36 /* The gmaps associated with this context are allowed to use huge pages. */ 37 unsigned int allow_gmap_hpage_1m:1; 38 } mm_context_t; 39 40 #define INIT_MM_CONTEXT(name) \ 41 .context.lock = __SPIN_LOCK_UNLOCKED(name.context.lock), \ 42 .context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list), \ 43 .context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list), 44 45 static inline int tprot(unsigned long addr) 46 { 47 int rc = -EFAULT; 48 49 asm volatile( 50 " tprot 0(%1),0\n" 51 "0: ipm %0\n" 52 " srl %0,28\n" 53 "1:\n" 54 EX_TABLE(0b,1b) 55 : "+d" (rc) : "a" (addr) : "cc"); 56 return rc; 57 } 58 59 #endif 60