On Tue, 17 Nov 2020 10:42:13 -0500
Janosch Frank <frankja@xxxxxxxxxxxxx> wrote:
> Availability of SIE is announced via a feature bit in a SCLP info CPU
> entry. Let's add a framework that allows us to easily check for such
> facilities.
>
> Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
> ---
> lib/s390x/io.c | 1 +
> lib/s390x/sclp.c | 19 +++++++++++++++++++
> lib/s390x/sclp.h | 15 +++++++++++++++
> 3 files changed, 35 insertions(+)
(...)
> +void sclp_facilities_setup(void)
> +{
> + unsigned short cpu0_addr = stap();
> + CPUEntry *cpu;
> + int i;
> +
> + assert(read_info);
> +
> + cpu = (void *)read_info + read_info->offset_cpu;
> + for (i = 0; i < read_info->entries_cpu; i++, cpu++) {
> + if (cpu->address == cpu0_addr) {
> + sclp_facilities.has_sief2 = test_bit_inv(SCLP_CPU_FEATURE_SIEF2_BIT, (void *)&cpu->address);
Can you wrap this? This line is really overlong.
(Also, just to understand: Is sief2 only indicated for cpu0, and not
for the other cpus?)
> + break;
> + }
> + }
> +}
> +
> /* Perform service call. Return 0 on success, non-zero otherwise. */
> int sclp_service_call(unsigned int command, void *sccb)
> {
