cpuid-dump should handle leaf 0x1f

dlenski · dlenski · commit e2ed60b69e1c · 2025-11-21T15:10:39.000-08:00
Per Intel's April 2023 documentation (https://cdrdv2-public.intel.com/775917/intel-64-architecture-processor-topology-enumeration.pdf): > The extended topology enumeration leaf of CPUID (leaf 0BH) was introduced > in 2009 along with the x2APIC IDs. This leaf has been superseded by the > v2 extended topology enumeration leaf (CPUID leaf 1FH), which is the > preferred interface for system topology enumeration for current Intel 64 > processors
diff --git a/tools/cpuid-dump.c b/tools/cpuid-dump.c
@@ -92,6 +92,7 @@ int main(int argc, char** argv) {
 				}
 				break;
 			case UINT32_C(0x0000000B):
+			case UINT32_C(0x0000001F): // Extended/V2
 				for (uint32_t ecx = 0;; ecx++) {
 					const struct cpuid_regs regs = cpuidex(eax, ecx);
 					if ((regs.ecx & UINT32_C(0x0000FF00)) == 0) {

Original file line number	Diff line number	Diff line change
`@@ -92,6 +92,7 @@ int main(int argc, char** argv) {`
`92`	`92`	`}`
`93`	`93`	`break;`
`94`	`94`	`case UINT32_C(0x0000000B):`
	`95`	`+ case UINT32_C(0x0000001F): // Extended/V2`
`95`	`96`	`for (uint32_t ecx = 0;; ecx++) {`
`96`	`97`	`const struct cpuid_regs regs = cpuidex(eax, ecx);`
`97`	`98`	`if ((regs.ecx & UINT32_C(0x0000FF00)) == 0) {`