On 22/03/2018 00:23, Liran Alon wrote:
> From: Arbel Moshe <arbel.moshe@xxxxxxxxxx>
>
> Add a delay utility to x86 arch.
> The delay is in number of busy-loop iterations running 'pause'.
>
> Signed-off-by: Arbel Moshe <arbel.moshe@xxxxxxxxxx>
> Signed-off-by: Liran Alon <liran.alon@xxxxxxxxxx>
> Signed-off-by: Krish Sadhukhan <krish.sadhukhan@xxxxxxxxxx>
This last should be a Reviewed-by. I queued the patches, thanks.
Paolo
> ---
> lib/x86/delay.c | 8 ++++++++
> lib/x86/delay.h | 8 ++++++++
> x86/Makefile.common | 1 +
> 3 files changed, 17 insertions(+)
> create mode 100644 lib/x86/delay.c
> create mode 100644 lib/x86/delay.h
>
> diff --git a/lib/x86/delay.c b/lib/x86/delay.c
> new file mode 100644
> index 000000000000..595ad24fec69
> --- /dev/null
> +++ b/lib/x86/delay.c
> @@ -0,0 +1,8 @@
> +#include "delay.h"
> +
> +void delay(u64 count)
> +{
> + while (count--)
> + asm volatile("pause");
> +}
> +
> diff --git a/lib/x86/delay.h b/lib/x86/delay.h
> new file mode 100644
> index 000000000000..a9bf89485509
> --- /dev/null
> +++ b/lib/x86/delay.h
> @@ -0,0 +1,8 @@
> +#ifndef __X86_DELAY__
> +#define __X86_DELAY__
> +
> +#include "libcflat.h"
> +
> +void delay(u64 count);
> +
> +#endif
> diff --git a/x86/Makefile.common b/x86/Makefile.common
> index 5f7eac4a26be..57f0bc7d16c3 100644
> --- a/x86/Makefile.common
> +++ b/x86/Makefile.common
> @@ -19,6 +19,7 @@ cflatobjs += lib/x86/desc.o
> cflatobjs += lib/x86/isr.o
> cflatobjs += lib/x86/acpi.o
> cflatobjs += lib/x86/stack.o
> +cflatobjs += lib/x86/delay.o
>
> OBJDIRS += lib/x86
>
>
