2 * Intel specific MCE features.
3 * Copyright 2004 Zwane Mwaikambo <zwane@linuxpower.ca>
6 #include <linux/init.h>
7 #include <linux/interrupt.h>
8 #include <linux/percpu.h>
9 #include <asm/processor.h>
12 #include <asm/hw_irq.h>
14 #include <asm/therm_throt.h>
16 asmlinkage void smp_thermal_interrupt(void)
25 rdmsrl(MSR_IA32_THERM_STATUS, msr_val);
26 if (therm_throt_process(msr_val & 1))
27 mce_log_therm_throt_event(smp_processor_id(), msr_val);
32 static void __cpuinit intel_init_thermal(struct cpuinfo_x86 *c)
36 unsigned int cpu = smp_processor_id();
38 if (!cpu_has(c, X86_FEATURE_ACPI))
41 if (!cpu_has(c, X86_FEATURE_ACC))
44 /* first check if TM1 is already enabled by the BIOS, in which
45 * case there might be some SMM goo which handles it, so we can't even
46 * put a handler since it might be delivered via SMI already.
48 rdmsr(MSR_IA32_MISC_ENABLE, l, h);
49 h = apic_read(APIC_LVTTHMR);
50 if ((l & (1 << 3)) && (h & APIC_DM_SMI)) {
52 "CPU%d: Thermal monitoring handled by SMI\n", cpu);
56 if (cpu_has(c, X86_FEATURE_TM2) && (l & (1 << 13)))
59 if (h & APIC_VECTOR_MASK) {
61 "CPU%d: Thermal LVT vector (%#x) already "
62 "installed\n", cpu, (h & APIC_VECTOR_MASK));
66 h = THERMAL_APIC_VECTOR;
67 h |= (APIC_DM_FIXED | APIC_LVT_MASKED);
68 apic_write(APIC_LVTTHMR, h);
70 rdmsr(MSR_IA32_THERM_INTERRUPT, l, h);
71 wrmsr(MSR_IA32_THERM_INTERRUPT, l | 0x03, h);
73 rdmsr(MSR_IA32_MISC_ENABLE, l, h);
74 wrmsr(MSR_IA32_MISC_ENABLE, l | (1 << 3), h);
76 l = apic_read(APIC_LVTTHMR);
77 apic_write(APIC_LVTTHMR, l & ~APIC_LVT_MASKED);
78 printk(KERN_INFO "CPU%d: Thermal monitoring enabled (%s)\n",
79 cpu, tm2 ? "TM2" : "TM1");
81 /* enable thermal throttle processing */
82 atomic_set(&therm_throt_en, 1);
86 void __cpuinit mce_intel_feature_init(struct cpuinfo_x86 *c)
88 intel_init_thermal(c);