[Skiboot] [PATCH v3 1/3] powernv:idle: Add IDLE_STATE_ENTER_SEQ_NORET macro

[Balbir Singh]

On 10/11/16 18:54, Gautham R. Shenoy wrote:
> From: "Gautham R. Shenoy" <ego at linux.vnet.ibm.com>
> 
> Currently all the low-power idle states are expected to wake up
> at reset vector 0x100. Which is why the macro IDLE_STATE_ENTER_SEQ
> that puts the CPU to an idle state and never returns.
> 
> On ISA_300, when the ESL and EC bits in the PSSCR are zero, the
> CPU is expected to wake up at the next instruction of the idle
> instruction.
> 
> This patch adds a new macro named IDLE_STATE_ENTER_SEQ_NORET for the

I think something like IDLE_STATE_ENTER_SEQ_LOSE_CTX would be better?

> no-return variant and reuses the name IDLE_STATE_ENTER_SEQ
> for a variant that allows resuming operation at the instruction next
> to the idle-instruction.
> 
<snip>
> +
> +#define	IDLE_STATE_ENTER_SEQ_NORET(IDLE_INST)			\
> +	IDLE_STATE_ENTER_SEQ(IDLE_INST)                         \

So we start off with both as the same?

>  	b	.
>  #endif /* CONFIG_PPC_P7_NAP */
<snip>
Balbir