compel: fpu -- Add compel_fpu_feature_offset helper

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Reviewed-by: Dmitry Safonov <0x7f454c46@gmail.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

compel/arch/aarch64/src/lib/cpu.c

@@ -46,6 +46,15 @@ uint32_t compel_fpu_feature_size(unsigned int feature)
 	return 0;
 }
 
+uint32_t compel_fpu_feature_offset(unsigned int feature)
+{
+	if (!rt_info_done) {
+		compel_cpuid(&rt_info);
+		rt_info_done = true;
+	}
+	return 0;
+}
+
 void compel_cpu_clear_feature(unsigned int feature)
 {
 	if (!rt_info_done) {

compel/arch/arm/src/lib/cpu.c

@@ -46,6 +46,15 @@ uint32_t compel_fpu_feature_size(unsigned int feature)
 	return 0;
 }
 
+uint32_t compel_fpu_feature_offset(unsigned int feature)
+{
+	if (!rt_info_done) {
+		compel_cpuid(&rt_info);
+		rt_info_done = true;
+	}
+	return 0;
+}
+
 void compel_cpu_clear_feature(unsigned int feature)
 {
 	if (!rt_info_done) {

compel/arch/ppc64/src/lib/cpu.c

@@ -60,6 +60,15 @@ uint32_t compel_fpu_feature_size(unsigned int feature)
 	return 0;
 }
 
+uint32_t compel_fpu_feature_offset(unsigned int feature)
+{
+	if (!rt_info_done) {
+		compel_cpuid(&rt_info);
+		rt_info_done = true;
+	}
+	return 0;
+}
+
 void compel_cpu_clear_feature(unsigned int feature)
 {
 	if (!rt_info_done) {

compel/arch/s390/src/lib/cpu.c

@@ -51,6 +51,15 @@ bool compel_fpu_has_feature(unsigned int feature)
 	return compel_test_fpu_cap(&rt_info, feature);
 }
 
+uint32_t compel_fpu_feature_offset(unsigned int feature)
+{
+	if (!rt_info_done) {
+		compel_cpuid(&rt_info);
+		rt_info_done = true;
+	}
+	return 0;
+}
+
 uint32_t compel_fpu_feature_size(unsigned int feature)
 {
 	if (!rt_info_done) {

compel/arch/x86/src/lib/cpu.c

@@ -466,6 +466,18 @@ uint32_t compel_fpu_feature_size(unsigned int feature)
 	return 0;
 }
 
+uint32_t compel_fpu_feature_offset(unsigned int feature)
+{
+	if (!rt_info_done) {
+		compel_cpuid(&rt_info);
+		rt_info_done = true;
+	}
+	if (feature >= FIRST_EXTENDED_XFEATURE &&
+	    feature < XFEATURE_MAX)
+		return rt_info.xstate_offsets[feature];
+	return 0;
+}
+
 void compel_cpu_clear_feature(unsigned int feature)
 {
 	if (!rt_info_done) {

compel/include/uapi/cpu.h

@@ -10,6 +10,7 @@ extern int compel_cpuid(compel_cpuinfo_t *info);
 extern bool compel_cpu_has_feature(unsigned int feature);
 extern bool compel_fpu_has_feature(unsigned int feature);
 extern uint32_t compel_fpu_feature_size(unsigned int feature);
+extern uint32_t compel_fpu_feature_offset(unsigned int feature);
 extern void compel_cpu_clear_feature(unsigned int feature);
 extern void compel_cpu_copy_cpuinfo(compel_cpuinfo_t *c);