On 06/06/2017 12:45 PM, Borislav Petkov wrote:
On Tue, Jun 06, 2017 at 12:15:30PM +0200, Peter Zijlstra wrote:
Maybe something like:
for (cache_level = 0; cache_level < 3; cache_level++) {
cpuid_count(0x801d, cache_level, , , , );
if ((eax & 0x1f)
On 06/06/2017 12:45 PM, Borislav Petkov wrote:
On Tue, Jun 06, 2017 at 12:15:30PM +0200, Peter Zijlstra wrote:
Maybe something like:
for (cache_level = 0; cache_level < 3; cache_level++) {
cpuid_count(0x801d, cache_level, , , , );
if ((eax & 0x1f)
On Tue, Jun 06, 2017 at 12:15:30PM +0200, Peter Zijlstra wrote:
> Maybe something like:
>
> for (cache_level = 0; cache_level < 3; cache_level++) {
> cpuid_count(0x801d, cache_level, , , , );
>
> if ((eax & 0x1f) == 0) /* EAX[0:4] gives cache type */
On Tue, Jun 06, 2017 at 12:15:30PM +0200, Peter Zijlstra wrote:
> Maybe something like:
>
> for (cache_level = 0; cache_level < 3; cache_level++) {
> cpuid_count(0x801d, cache_level, , , , );
>
> if ((eax & 0x1f) == 0) /* EAX[0:4] gives cache type */
On Mon, Jun 05, 2017 at 11:13:19AM -0500, Janakarajan Natarajan wrote:
> + /*
> + * Iterate over Cache Topology Definition leaves until no
> + * more cache descriptions are available
> + */
> + while (1) {
> +
On Mon, Jun 05, 2017 at 11:13:19AM -0500, Janakarajan Natarajan wrote:
> + /*
> + * Iterate over Cache Topology Definition leaves until no
> + * more cache descriptions are available
> + */
> + while (1) {
> +
In Family 17h, the number of cores sharing a cache level is obtained
from the Cache Properties CPUID leaf (0x801d) by passing in the
cache level in ECX. In prior families, a cache level of 2 was used to
determine this information.
To get the right information, irrespective of Family, iterate
In Family 17h, the number of cores sharing a cache level is obtained
from the Cache Properties CPUID leaf (0x801d) by passing in the
cache level in ECX. In prior families, a cache level of 2 was used to
determine this information.
To get the right information, irrespective of Family, iterate
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