Re: [Xen-devel] [PATCH v5 07/12] arm/mem_access: Introduce BIT_ULL bit operation

[Julien Grall <julien.grall@xxxxxxx>]

Hi Sergej,

On 06/27/2017 12:52 PM, Sergej Proskurin wrote:
> We introduce the BIT_ULL macro to using values of unsigned long long as
> to enable setting bits of 64-bit registers on AArch32.  In addition,
> this commit adds a define holding the register width of 64 bit
> double-word registers. This define simplifies using the associated
> constants in the following commits.
>
> Signed-off-by: Sergej Proskurin <proskurin@xxxxxxxxxxxxx>
Reviewed-by: Julien Grall <julien.grall@xxxxxxx>

Cheers,

> ---
> Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> Cc: Julien Grall <julien.grall@xxxxxxx>
> ---
> v4: We reused the previous commit with the msg "arm/mem_access: Add
>      defines holding the width of 32/64bit regs" from v3, as we can reuse
>      the already existing define BITS_PER_WORD.
>
> v5: Introduce a new macro BIT_ULL instead of changing the type of the
>      macro BIT.
>
>      Remove the define BITS_PER_DOUBLE_WORD.
> ---
>   xen/include/asm-arm/bitops.h | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/xen/include/asm-arm/bitops.h b/xen/include/asm-arm/bitops.h
> index bda889841b..1cbfb9edb2 100644
> --- a/xen/include/asm-arm/bitops.h
> +++ b/xen/include/asm-arm/bitops.h
> @@ -24,6 +24,7 @@
>   #define BIT(nr)                 (1UL << (nr))
>   #define BIT_MASK(nr)            (1UL << ((nr) % BITS_PER_WORD))
>   #define BIT_WORD(nr)            ((nr) / BITS_PER_WORD)
> +#define BIT_ULL(nr)             (1ULL << (nr))
>   #define BITS_PER_BYTE           8
>   
>   #define ADDR (*(volatile int *) addr)
--
Julien Grall

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