diff options
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/amd64/amd64/identcpu.c | 16 | ||||
| -rw-r--r-- | sys/i386/i386/identcpu.c | 29 |
2 files changed, 34 insertions, 11 deletions
diff --git a/sys/amd64/amd64/identcpu.c b/sys/amd64/amd64/identcpu.c index 4ac0e5f..46b7920 100644 --- a/sys/amd64/amd64/identcpu.c +++ b/sys/amd64/amd64/identcpu.c @@ -472,6 +472,22 @@ identify_cpu(void) cpu_feature = regs[3]; cpu_feature2 = regs[2]; + /* + * Clear "Limit CPUID Maxval" bit and get the largest standard CPUID + * function number again if it is set from BIOS. It is necessary + * for probing correct CPU topology later. + * XXX This is only done on the BSP package. + */ + if (cpu_vendor_id == CPU_VENDOR_INTEL && cpu_high > 0 && cpu_high < 4) { + uint64_t msr; + msr = rdmsr(MSR_IA32_MISC_ENABLE); + if ((msr & 0x400000ULL) != 0) { + wrmsr(MSR_IA32_MISC_ENABLE, msr & ~0x400000ULL); + do_cpuid(0, regs); + cpu_high = regs[0]; + } + } + if (cpu_vendor_id == CPU_VENDOR_INTEL || cpu_vendor_id == CPU_VENDOR_AMD || cpu_vendor_id == CPU_VENDOR_CENTAUR) { diff --git a/sys/i386/i386/identcpu.c b/sys/i386/i386/identcpu.c index 60907a5..af0da5b 100644 --- a/sys/i386/i386/identcpu.c +++ b/sys/i386/i386/identcpu.c @@ -209,7 +209,6 @@ printcpuinfo(void) if (cpu_vendor_id == CPU_VENDOR_INTEL) { if ((cpu_id & 0xf00) > 0x300) { u_int brand_index; - u_int model; cpu_model[0] = '\0'; @@ -322,16 +321,6 @@ printcpuinfo(void) case 0xf00: strcat(cpu_model, "Pentium 4"); cpu = CPU_P4; - model = (cpu_id & 0x0f0) >> 4; - if (model == 3 || model == 4 || model == 6) { - uint64_t tmp; - - tmp = rdmsr(MSR_IA32_MISC_ENABLE); - wrmsr(MSR_IA32_MISC_ENABLE, - tmp & ~(1LL << 22)); - do_cpuid(0, regs); - cpu_high = regs[0]; - } break; default: strcat(cpu_model, "unknown"); @@ -1110,6 +1099,24 @@ finishidentcpu(void) cpu_vendor_id = find_cpu_vendor_id(); + /* + * Clear "Limit CPUID Maxval" bit and get the largest standard CPUID + * function number again if it is set from BIOS. It is necessary + * for probing correct CPU topology later. + * XXX This is only done on the BSP package. + */ + if (cpu_vendor_id == CPU_VENDOR_INTEL && cpu_high > 0 && cpu_high < 4 && + ((I386_CPU_FAMILY(cpu_id) == 0xf && I386_CPU_MODEL(cpu_id) >= 0x3) || + (I386_CPU_FAMILY(cpu_id) == 0x6 && I386_CPU_MODEL(cpu_id) >= 0xe))) { + uint64_t msr; + msr = rdmsr(MSR_IA32_MISC_ENABLE); + if ((msr & 0x400000ULL) != 0) { + wrmsr(MSR_IA32_MISC_ENABLE, msr & ~0x400000ULL); + do_cpuid(0, regs); + cpu_high = regs[0]; + } + } + /* Detect AMD features (PTE no-execute bit, 3dnow, 64 bit mode etc) */ if (cpu_vendor_id == CPU_VENDOR_INTEL || cpu_vendor_id == CPU_VENDOR_AMD) { |
