diff options
Diffstat (limited to 'src/include/ipxe')
| -rw-r--r-- | src/include/ipxe/bigint.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/include/ipxe/bigint.h b/src/include/ipxe/bigint.h index f7900e0e6..a85761815 100644 --- a/src/include/ipxe/bigint.h +++ b/src/include/ipxe/bigint.h @@ -143,6 +143,16 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); bigint_bit_is_set_raw ( (value)->element, size, bit ); } ) /** + * Test if most significant bit is set in big integer + * + * @v value Big integer + * @ret is_set Most significant bit is set + */ +#define bigint_msb_is_set( value ) ( { \ + unsigned int size = bigint_size (value); \ + bigint_msb_is_set_raw ( (value)->element, size ); } ) + +/** * Find highest bit set in big integer * * @v value Big integer @@ -358,6 +368,23 @@ bigint_bit_is_set_raw ( const bigint_element_t *value0, unsigned int size, return ( !! ( value->element[index] & ( 1UL << subindex ) ) ); } +/** + * Test if most significant bit is set in big integer + * + * @v value0 Element 0 of big integer + * @v size Number of elements + * @ret is_set Most significant bit is set + */ +static inline __attribute__ (( always_inline )) int +bigint_msb_is_set_raw ( const bigint_element_t *value0, unsigned int size ) { + const bigint_t ( size ) __attribute__ (( may_alias )) *value = + ( ( const void * ) value0 ); + unsigned int index = ( size - 1 ); + unsigned int subindex = ( ( 8 * sizeof ( value->element[0] ) ) - 1 ); + + return ( !! ( value->element[index] & ( 1UL << subindex ) ) ); +} + void bigint_init_raw ( bigint_element_t *value0, unsigned int size, const void *data, size_t len ); void bigint_done_raw ( const bigint_element_t *value0, unsigned int size, |