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Add GENMASK macros 

Import GENMASK_32 and GENMASK_64 macros from optee-os (permissive license).
And default GENMASK is set to GENMASK_32 for AARCH32,
and to GENMASK_64 for 64bit arch.

fixes arm-software/tf-issues#596

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Signed-off-by: Nicolas Le Bayon <nicolas.le.bayon@st.com>
This commit is contained in:
Yann Gautier 2018-06-14 18:35:33 +02:00
parent 1ebdbe79c7
commit 39676357af
1 changed files with 17 additions and 0 deletions
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17
include/lib/utils_def.h
View File

@ -18,6 +18,23 @@
#define BIT(nr) (ULL(1) << (nr))
/*
* Create a contiguous bitmask starting at bit position @l and ending at
* position @h. For example
* GENMASK_64(39, 21) gives us the 64bit vector 0x000000ffffe00000.
*/
#define GENMASK_32(h, l) \
(((~UINT32_C(0)) << (l)) & (~UINT32_C(0) >> (32 - 1 - (h))))
#define GENMASK_64(h, l) \
(((~UINT64_C(0)) << (l)) & (~UINT64_C(0) >> (64 - 1 - (h))))
#ifdef AARCH32
#define GENMASK GENMASK_32
#else
#define GENMASK GENMASK_64
#endif
/*
* This variant of div_round_up can be used in macro definition but should not
* be used in C code as the `div` parameter is evaluated twice.