extern int x2apic_mode;
+static inline bool apic_is_x2apic_enabled(void)
+{
+ u64 msr;
+
+ if (rdmsrl_safe(MSR_IA32_APICBASE, &msr))
+ return false;
+ return msr & X2APIC_ENABLE;
+}
+
#ifdef CONFIG_X86_X2APIC
/*
* Make previous memory operations globally visible before
extern void enable_x2apic(void);
static inline int x2apic_enabled(void)
{
- u64 msr;
-
- if (!cpu_has_x2apic)
- return 0;
-
- rdmsrl(MSR_IA32_APICBASE, msr);
- if (msr & X2APIC_ENABLE)
- return 1;
- return 0;
+ return cpu_has_x2apic && apic_is_x2apic_enabled();
}
#define x2apic_supported() (cpu_has_x2apic)
int ret, ir_stat;
if (!IS_ENABLED(CONFIG_X86_X2APIC)) {
- u64 msr;
-
- rdmsrl(MSR_IA32_APICBASE, msr);
- if (msr & X2APIC_ENABLE)
+ if (apic_is_x2apic_enabled())
panic("BIOS has enabled x2apic but kernel doesn't support x2apic, please disable x2apic in BIOS.\n");
}