diff options
Diffstat (limited to 'arch/s390/mm')
| -rw-r--r-- | arch/s390/mm/maccess.c | 16 | ||||
| -rw-r--r-- | arch/s390/mm/pgtable.c | 1 |
2 files changed, 17 insertions, 0 deletions
diff --git a/arch/s390/mm/maccess.c b/arch/s390/mm/maccess.c index 51e5cd9b906..5dbbaa6e594 100644 --- a/arch/s390/mm/maccess.c +++ b/arch/s390/mm/maccess.c @@ -85,3 +85,19 @@ int memcpy_real(void *dest, void *src, size_t count) arch_local_irq_restore(flags); return rc; } + +/* + * Copy memory to absolute zero + */ +void copy_to_absolute_zero(void *dest, void *src, size_t count) +{ + unsigned long cr0; + + BUG_ON((unsigned long) dest + count >= sizeof(struct _lowcore)); + preempt_disable(); + __ctl_store(cr0, 0, 0); + __ctl_clear_bit(0, 28); /* disable lowcore protection */ + memcpy_real(dest + store_prefix(), src, count); + __ctl_load(cr0, 0, 0); + preempt_enable(); +} diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c index 2adb23938a7..4d1f2bce87b 100644 --- a/arch/s390/mm/pgtable.c +++ b/arch/s390/mm/pgtable.c @@ -528,6 +528,7 @@ static inline void page_table_free_pgste(unsigned long *table) static inline unsigned long *page_table_alloc_pgste(struct mm_struct *mm, unsigned long vmaddr) { + return NULL; } static inline void page_table_free_pgste(unsigned long *table) |