diff options
Diffstat (limited to 'src/cpu')
| -rw-r--r-- | src/cpu/x86/topology.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/src/cpu/x86/topology.c b/src/cpu/x86/topology.c index 6c8d7fd420..baa4a7a584 100644 --- a/src/cpu/x86/topology.c +++ b/src/cpu/x86/topology.c @@ -4,6 +4,8 @@ #include <device/device.h> #include <cpu/x86/topology.h> +#define CPUID_EXTENDED_CPU_TOPOLOGY2 0x1f + #define CPUID_EXTENDED_CPU_TOPOLOGY 0x0b #define LEVEL_TYPE_CORE 2 #define LEVEL_TYPE_SMT 1 @@ -21,6 +23,64 @@ #define CPUID_CPU_TOPOLOGY_CORE_BITS(res, threadbits) \ ((CPUID_CPU_TOPOLOGY(LEVEL_BITS, (res).eax)) - threadbits) +/* Return the level shift for the highest supported level (the package) */ +static enum cb_err get_cpu_package_bits(uint32_t *package_bits) +{ + struct cpuid_result cpuid_regs; + int level_num, cpu_id_op = 0; + const uint32_t cpuid_max_func = cpuid_get_max_func(); + + /* + * Not all CPUs support this, those won't get topology filled in here. + * CPU specific code can do this however. + */ + if (cpuid_max_func >= CPUID_EXTENDED_CPU_TOPOLOGY2) + cpu_id_op = CPUID_EXTENDED_CPU_TOPOLOGY2; + else if (cpuid_max_func >= CPUID_EXTENDED_CPU_TOPOLOGY) + cpu_id_op = CPUID_EXTENDED_CPU_TOPOLOGY; + else + return CB_ERR; + + *package_bits = level_num = 0; + cpuid_regs = cpuid_ext(cpu_id_op, level_num); + + /* + * Sub-leaf index 0 enumerates SMT level, some AMD CPUs leave this CPUID leaf + * reserved so bail out. Cpu specific code can fill in the topology later. + */ + if (CPUID_CPU_TOPOLOGY_LEVEL(cpuid_regs) != LEVEL_TYPE_SMT) + return CB_ERR; + + do { + *package_bits = (CPUID_CPU_TOPOLOGY(LEVEL_BITS, (cpuid_regs).eax)); + level_num++; + cpuid_regs = cpuid_ext(cpu_id_op, level_num); + /* Stop when level type is invalid i.e 0. */ + } while (CPUID_CPU_TOPOLOGY_LEVEL(cpuid_regs)); + + return CB_SUCCESS; +} + +void set_cpu_node_id_leaf_1f_b(struct device *cpu) +{ + static uint32_t package_bits; + static enum cb_err package_bits_ret; + static bool done = false; + + if (!done) { + package_bits_ret = get_cpu_package_bits(&package_bits); + done = true; + } + + const uint32_t apicid = cpu->path.apic.initial_lapicid; + + /* + * If leaf_1f or leaf_b does not exist don't update the node_id. + */ + if (package_bits_ret == CB_SUCCESS) + cpu->path.apic.node_id = (apicid >> package_bits); +} + /* Get number of bits for core ID and SMT ID */ static enum cb_err get_cpu_core_thread_bits(uint32_t *core_bits, uint32_t *thread_bits) { |