On 5/18/20 6:07 PM, Pierre Morel wrote:
> Allow the program to wait for an interrupt.
>
> The interrupt handler is in charge to remove the WAIT bit
> when it finished handling the interrupt.
>
> Signed-off-by: Pierre Morel <pmorel@xxxxxxxxxxxxx>
Reviewed-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
> ---
> lib/s390x/asm/arch_def.h | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/lib/s390x/asm/arch_def.h b/lib/s390x/asm/arch_def.h
> index 54ffd0b..f200e28 100644
> --- a/lib/s390x/asm/arch_def.h
> +++ b/lib/s390x/asm/arch_def.h
> @@ -10,9 +10,11 @@
> #ifndef _ASM_S390X_ARCH_DEF_H_
> #define _ASM_S390X_ARCH_DEF_H_
>
> +#define PSW_MASK_IO 0x0200000000000000UL
> #define PSW_MASK_EXT 0x0100000000000000UL
> #define PSW_MASK_DAT 0x0400000000000000UL
> #define PSW_MASK_SHORT_PSW 0x0008000000000000UL
> +#define PSW_MASK_WAIT 0x0002000000000000UL
> #define PSW_MASK_PSTATE 0x0001000000000000UL
> #define PSW_MASK_BA 0x0000000080000000UL
> #define PSW_MASK_EA 0x0000000100000000UL
> @@ -253,6 +255,18 @@ static inline void load_psw_mask(uint64_t mask)
> : "+r" (tmp) : "a" (&psw) : "memory", "cc" );
> }
>
> +static inline void wait_for_interrupt(uint64_t irq_mask)
> +{
> + uint64_t psw_mask = extract_psw_mask();
> +
> + load_psw_mask(psw_mask | irq_mask | PSW_MASK_WAIT);
> + /*
> + * After being woken and having processed the interrupt, let's restore
> + * the PSW mask.
> + */
> + load_psw_mask(psw_mask);
> +}
> +
> static inline void enter_pstate(void)
> {
> uint64_t mask;
>
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