static int baytrail_get_count(struct udevice *dev)
{
int ecx = 0;
/*
* Use the algorithm described in Intel 64 and IA-32 Architectures
* Software Developer's Manual Volume 3 (3A, 3B & 3C): System
* Programming Guide, Jan-2015. Section 8.9.2: Hierarchical Mapping
* of CPUID Extended Topology Leaf.
*/
while (1) {
struct cpuid_result leaf_b;
leaf_b = cpuid_ext(0xb, ecx);
/*
* Bay Trail doesn't have hyperthreading so just determine the
* number of cores by from level type (ecx[15:8] == * 2)
*/
if ((leaf_b.ecx & 0xff00) == 0x0200)
return leaf_b.ebx & 0xffff;
ecx++;
}
return 0;
}
static void detect_num_cpus(struct pattrs *attrs)
{
int ecx = 0;
while (1) {
struct cpuid_result leaf_b;
leaf_b = cpuid_ext(0xb, ecx);
/* Bay Trail doesn't have hyperthreading so just determine the
* number of cores by from level type (ecx[15:8] == * 2). */
if ((leaf_b.ecx & 0xff00) == 0x0200) {
attrs->num_cpus = leaf_b.ebx & 0xffff;
break;
}
ecx++;
}
}