1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright IBM Corp. 2020 */ 3 4 #include <linux/compiler.h> 5 #include <linux/getcpu.h> 6 #include <asm/timex.h> 7 8 int __s390_vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unused) 9 { 10 __u16 todval[8]; 11 12 /* CPU number is stored in the programmable field of the TOD clock */ 13 get_tod_clock_ext((char *)todval); 14 if (cpu) 15 *cpu = todval[7]; 16 /* NUMA node is always zero */ 17 if (node) 18 *node = 0; 19 return 0; 20 } 21