diff options
Diffstat (limited to 'arch/x86/machine/cpu.c')
| -rw-r--r-- | arch/x86/machine/cpu.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/arch/x86/machine/cpu.c b/arch/x86/machine/cpu.c index f07e6d1a..4767789a 100644 --- a/arch/x86/machine/cpu.c +++ b/arch/x86/machine/cpu.c @@ -327,8 +327,10 @@ cpu_init(struct cpu *cpu) memcpy(cpu->vendor_id + 8, &ecx, sizeof(ecx)); cpu->vendor_id[sizeof(cpu->vendor_id) - 1] = '\0'; - /* Initialized if the processor supports brand strings */ + /* Some fields are only initialized if supported by the processor */ cpu->model_name[0] = '\0'; + cpu->phys_addr_width = 0; + cpu->virt_addr_width = 0; assert(max_basic >= 1); @@ -394,6 +396,13 @@ cpu_init(struct cpu *cpu) cpu->model_name[sizeof(cpu->model_name) - 1] = '\0'; } + if (max_extended >= 0x80000008) { + eax = 0x80000008; + cpu_cpuid(&eax, &ebx, &ecx, &edx); + cpu->phys_addr_width = (unsigned short)eax & 0xff; + cpu->virt_addr_width = ((unsigned short)eax >> 8) & 0xff; + } + cpu->state = CPU_STATE_ON; } @@ -441,6 +450,10 @@ cpu_info(const struct cpu *cpu) if (strlen(cpu->model_name) > 0) printk("cpu%u: %s\n", cpu->id, cpu->model_name); + + if ((cpu->phys_addr_width != 0) && (cpu->virt_addr_width != 0)) + printk("cpu%u: address widths: physical: %hu, virtual: %hu\n", + cpu->id, cpu->phys_addr_width, cpu->virt_addr_width); } void __init |