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Re: help needed with CPU feature detection for aarch64
wiz%netbsd.org@localhost (Thomas Klausner) writes:
>His questions seems to be mostly about how to interpret the
>machdep.id_aa64isar0 sysctl result.
machdep.id_aa64isar0 is OpenBSD, it's the 64bit value that
includes various flags about CPU features.
machdep.cpu0.id_cpu is NetBSD, the result is a
struct aarch64_sysctl_cpu_id {
uint64_t ac_midr; /* Main ID Register */
uint64_t ac_revidr; /* Revision ID Register */
uint64_t ac_mpidr; /* Multiprocessor Affinity Register */
uint64_t ac_aa64dfr0; /* A64 Debug Feature Register 0 */
uint64_t ac_aa64dfr1; /* A64 Debug Feature Register 1 */
uint64_t ac_aa64isar0; /* A64 Instruction Set Attribute Register 0 */
uint64_t ac_aa64isar1; /* A64 Instruction Set Attribute Register 1 */
uint64_t ac_aa64mmfr0; /* A64 Memory Model Feature Register 0 */
uint64_t ac_aa64mmfr1; /* A64 Memory Model Feature Register 1 */
uint64_t ac_aa64mmfr2; /* A64 Memory Model Feature Register 2 */
uint64_t ac_aa64pfr0; /* A64 Processor Feature Register 0 */
uint64_t ac_aa64pfr1; /* A64 Processor Feature Register 1 */
uint64_t ac_aa64zfr0; /* A64 SVE Feature ID Register 0 */
uint32_t ac_mvfr0; /* Media and VFP Feature Register 0 */
uint32_t ac_mvfr1; /* Media and VFP Feature Register 1 */
uint32_t ac_mvfr2; /* Media and VFP Feature Register 2 */
uint32_t ac_pad;
uint64_t ac_clidr; /* Cache Level ID Register */
uint64_t ac_ctr; /* Cache Type Register */
};
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