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Diffstat (limited to '')
| -rw-r--r-- | arch/s390/include/asm/mmu.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/arch/s390/include/asm/mmu.h b/arch/s390/include/asm/mmu.h new file mode 100644 index 000000000..e12ff0f29 --- /dev/null +++ b/arch/s390/include/asm/mmu.h @@ -0,0 +1,58 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __MMU_H +#define __MMU_H + +#include <linux/cpumask.h> +#include <linux/errno.h> + +typedef struct { + spinlock_t lock; + cpumask_t cpu_attach_mask; + atomic_t flush_count; + unsigned int flush_mm; + struct list_head pgtable_list; + struct list_head gmap_list; + unsigned long gmap_asce; + unsigned long asce; + unsigned long asce_limit; + unsigned long vdso_base; + /* The mmu context belongs to a secure guest. */ + atomic_t is_protected; + /* + * The following bitfields need a down_write on the mm + * semaphore when they are written to. As they are only + * written once, they can be read without a lock. + * + * The mmu context allocates 4K page tables. + */ + unsigned int alloc_pgste:1; + /* The mmu context uses extended page tables. */ + unsigned int has_pgste:1; + /* The mmu context uses storage keys. */ + unsigned int uses_skeys:1; + /* The mmu context uses CMM. */ + unsigned int uses_cmm:1; + /* The gmaps associated with this context are allowed to use huge pages. */ + unsigned int allow_gmap_hpage_1m:1; +} mm_context_t; + +#define INIT_MM_CONTEXT(name) \ + .context.lock = __SPIN_LOCK_UNLOCKED(name.context.lock), \ + .context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list), \ + .context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list), + +static inline int tprot(unsigned long addr) +{ + int rc = -EFAULT; + + asm volatile( + " tprot 0(%1),0\n" + "0: ipm %0\n" + " srl %0,28\n" + "1:\n" + EX_TABLE(0b,1b) + : "+d" (rc) : "a" (addr) : "cc"); + return rc; +} + +#endif |