[PATCH 1/3] Add rtems_filesystem_make_dev_t_from_pointer()

[Daniel Gutson]

Hi Sebastian,

On Wed, Feb 4, 2015 at 10:46 AM, Sebastian Huber <
sebastian.huber at embedded-brains.de> wrote:

> ---
>  cpukit/libcsupport/include/rtems/libio.h | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/cpukit/libcsupport/include/rtems/libio.h
> b/cpukit/libcsupport/include/rtems/libio.h
> index a4607de..998cd30 100644
> --- a/cpukit/libcsupport/include/rtems/libio.h
> +++ b/cpukit/libcsupport/include/rtems/libio.h
> @@ -1442,6 +1442,16 @@ static inline dev_t rtems_filesystem_make_dev_t(
>    return temp.device;
>  }
>
> +static inline dev_t rtems_filesystem_make_dev_t_from_pointer(
> +  const void *pointer
> +)
> +{
> +  uint64_t one = 1;
> +  uint64_t temp = (one << 63) | (((uintptr_t) pointer) >> 1);
>

Sorry the irrelevant detail, but may I ask why not

    (((uint64_t)1) << 63) ...

?

I know that anyway the variable will likely be optimized out.


> +
> +  return rtems_filesystem_make_dev_t((uint32_t) (temp >> 32), (uint32_t)
> temp);
> +}
> +
>  static inline rtems_device_major_number rtems_filesystem_dev_major_t(
>    dev_t device
>  )
> --
> 1.8.1.4
>
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>



-- 

Daniel F. Gutson
Chief Engineering Officer, SPD

San Lorenzo 47, 3rd Floor, Office 5
Córdoba, Argentina

Phone:   +54 351 4217888 / +54 351 4218211
Skype:    dgutson
LinkedIn: http://ar.linkedin.com/in/danielgutson
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