| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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 | } mm_context_t; |
| 36 | |
| 37 | #define INIT_MM_CONTEXT(name) \ |
| 38 | .context.lock = __SPIN_LOCK_UNLOCKED(name.context.lock), \ |
| 39 | .context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list), \ |
| 40 | .context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list), |
| 41 | |
| 42 | static inline int tprot(unsigned long addr) |
| 43 | { |
| 44 | int rc = -EFAULT; |
| 45 | |
| 46 | asm volatile( |
| 47 | " tprot 0(%1),0\n" |
| 48 | "0: ipm %0\n" |
| 49 | " srl %0,28\n" |
| 50 | "1:\n" |
| 51 | EX_TABLE(0b,1b) |
| 52 | : "+d" (rc) : "a" (addr) : "cc"); |
| 53 | return rc; |
| 54 | } |
| 55 | |
| 56 | #endif |