diff options
Diffstat (limited to 'arch/s390/include/asm/idals.h')
| -rw-r--r-- | arch/s390/include/asm/idals.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/s390/include/asm/idals.h b/arch/s390/include/asm/idals.h index 40eae2c08d61..59fcc3c72edf 100644 --- a/arch/s390/include/asm/idals.h +++ b/arch/s390/include/asm/idals.h @@ -23,6 +23,9 @@ #define IDA_SIZE_LOG 12 /* 11 for 2k , 12 for 4k */ #define IDA_BLOCK_SIZE (1L<<IDA_SIZE_LOG) +#define IDA_2K_SIZE_LOG 11 +#define IDA_2K_BLOCK_SIZE (1L << IDA_2K_SIZE_LOG) + /* * Test if an address/length pair needs an idal list. */ @@ -43,6 +46,15 @@ static inline unsigned int idal_nr_words(void *vaddr, unsigned int length) } /* + * Return the number of 2K IDA words needed for an address/length pair. + */ +static inline unsigned int idal_2k_nr_words(void *vaddr, unsigned int length) +{ + return ((__pa(vaddr) & (IDA_2K_BLOCK_SIZE - 1)) + length + + (IDA_2K_BLOCK_SIZE - 1)) >> IDA_2K_SIZE_LOG; +} + +/* * Create the list of idal words for an address/length pair. */ static inline unsigned long *idal_create_words(unsigned long *idaws, |