xref: /linux/tools/testing/selftests/bpf/progs/get_smp_processor_id.c (revision 5a8cd539ac19f7a68e68e1d25ef9ca2ff55b8500) 
1 // SPDX-License-Identifier: GPL-2.0
2 
3 #include <linux/bpf.h>
4 #include <bpf/bpf_helpers.h>
5 #include "bpf_misc.h"
6 
7 __u64 cpu_nr_result;
8 
9 SEC("raw_tp")
call_bpf_get_smp_processor_id(void)10 void call_bpf_get_smp_processor_id(void)
11 {
12 	register __u64 r0 asm("r0") = -1;
13 	asm volatile ("call %[bpf_get_smp_processor_id];"
14 		      : "+r"(r0)
15 		      : __imm(bpf_get_smp_processor_id)
16 		      : "r1", "r2", "r3", "r4", "r5", "memory");
17 	cpu_nr_result = r0;
18 }
19 
20 char _license[] SEC("license") = "GPL";
21