| Eric Biederman | fcd5ace | 2004-10-14 19:29:29 +0000 | [diff] [blame^] | 1 | #include <console/console.h> |
| 2 | #include <cpu/cpu.h> |
| 3 | #include <cpu/x86/lapic.h> |
| 4 | #include <cpu/intel/hyperthreading.h> |
| 5 | #include <device/device.h> |
| 6 | #include <pc80/mc146818rtc.h> |
| 7 | #include <smp/spinlock.h> |
| 8 | |
| 9 | static int first_time = 1; |
| 10 | static int disable_siblings = !CONFIG_LOGICAL_CPUS; |
| 11 | |
| 12 | void intel_sibling_init(device_t cpu) |
| 13 | { |
| 14 | unsigned i, siblings; |
| 15 | struct cpuid_result result; |
| 16 | |
| 17 | /* On the bootstrap processor see if I want sibling cpus enabled */ |
| 18 | if (first_time) { |
| 19 | first_time = 0; |
| 20 | get_option(&disable_siblings, "hyper_threading"); |
| 21 | } |
| 22 | result = cpuid(1); |
| 23 | /* Is hypethreading supported */ |
| 24 | if (!(result.edx & (1 << 28))) { |
| 25 | return; |
| 26 | } |
| 27 | /* See how many sibling cpus we have */ |
| 28 | siblings = (result.ebx >> 16) & 0xff; |
| 29 | if (siblings < 1) { |
| 30 | siblings = 1; |
| 31 | } |
| 32 | |
| 33 | #if 1 |
| 34 | printk_debug("CPU: %u %d siblings\n", |
| 35 | cpu->path.u.apic.apic_id, |
| 36 | siblings); |
| 37 | #endif |
| 38 | |
| 39 | /* See if I am a sibling cpu */ |
| 40 | if (cpu->path.u.apic.apic_id & (siblings -1)) { |
| 41 | if (disable_siblings) { |
| 42 | cpu->enabled = 0; |
| 43 | } |
| 44 | return; |
| 45 | } |
| 46 | |
| 47 | /* I am the primary cpu start up my siblings */ |
| 48 | for(i = 1; i < siblings; i++) { |
| 49 | struct device_path cpu_path; |
| 50 | device_t new; |
| 51 | unsigned long count; |
| 52 | /* Build the cpu device path */ |
| 53 | cpu_path.type = DEVICE_PATH_APIC; |
| 54 | cpu_path.u.apic.apic_id = cpu->path.u.apic.apic_id + i; |
| 55 | |
| 56 | |
| 57 | /* Allocate the new cpu device structure */ |
| 58 | new = alloc_dev(cpu->bus, &cpu_path); |
| 59 | |
| 60 | if (!new) { |
| 61 | continue; |
| 62 | } |
| 63 | |
| 64 | #if 1 |
| 65 | printk_debug("CPU: %u has sibling %u\n", |
| 66 | cpu->path.u.apic.apic_id, |
| 67 | new->path.u.apic.apic_id); |
| 68 | #endif |
| 69 | /* Start the new cpu */ |
| 70 | start_cpu(new); |
| 71 | } |
| 72 | |
| 73 | } |
| 74 | |