1 #if defined(__i386__) || defined(__x86_64__)
2 
3 #include "helpers/helpers.h"
4 
5 #define MSR_AMD_HWCR	0xc0010015
6 
7 int cpufreq_has_boost_support(unsigned int cpu, int *support, int *active,
8 			int *states)
9 {
10 	struct cpupower_cpu_info cpu_info;
11 	int ret;
12 	unsigned long long val;
13 
14 	*support = *active = *states = 0;
15 
16 	ret = get_cpu_info(0, &cpu_info);
17 	if (ret)
18 		return ret;
19 
20 	if (cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_CBP) {
21 		*support = 1;
22 
23 		/* AMD Family 0x17 does not utilize PCI D18F4 like prior
24 		 * families and has no fixed discrete boost states but
25 		 * has Hardware determined variable increments instead.
26 		 */
27 
28 		if (cpu_info.family == 0x17) {
29 			if (!read_msr(cpu, MSR_AMD_HWCR, &val)) {
30 				if (!(val & CPUPOWER_AMD_CPBDIS))
31 					*active = 1;
32 			}
33 		} else {
34 			ret = amd_pci_get_num_boost_states(active, states);
35 			if (ret)
36 				return ret;
37 		}
38 	} else if (cpupower_cpu_info.caps & CPUPOWER_CAP_INTEL_IDA)
39 		*support = *active = 1;
40 	return 0;
41 }
42 #endif /* #if defined(__i386__) || defined(__x86_64__) */
43