| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <assert.h> |
| #include <cpu/cpu.h> |
| #include <cpu/x86/lapic.h> |
| #include <cpu/x86/lapic_def.h> |
| #include <cpu/x86/msr.h> |
| #include <console/console.h> |
| #include <smp/node.h> |
| #include <stdint.h> |
| |
| void enable_lapic(void) |
| { |
| uintptr_t apic_base; |
| bool use_x2apic; |
| msr_t msr; |
| |
| msr = rdmsr(LAPIC_BASE_MSR); |
| if (!(msr.lo & LAPIC_BASE_MSR_ENABLE)) { |
| msr.hi &= 0xffffff00; |
| msr.lo &= ~LAPIC_BASE_MSR_ADDR_MASK; |
| msr.lo |= LAPIC_DEFAULT_BASE; |
| msr.lo |= LAPIC_BASE_MSR_ENABLE; |
| wrmsr(LAPIC_BASE_MSR, msr); |
| msr = rdmsr(LAPIC_BASE_MSR); |
| } |
| |
| ASSERT(msr.lo & LAPIC_BASE_MSR_ENABLE); |
| |
| apic_base = msr.lo & LAPIC_BASE_MSR_ADDR_MASK; |
| ASSERT(apic_base == LAPIC_DEFAULT_BASE); |
| |
| if (CONFIG(XAPIC_ONLY)) { |
| use_x2apic = false; |
| } else { |
| use_x2apic = !!(cpu_get_feature_flags_ecx() & CPUID_X2APIC); |
| ASSERT(CONFIG(X2APIC_RUNTIME) || use_x2apic); |
| } |
| |
| if (use_x2apic == !!(msr.lo & LAPIC_BASE_MSR_X2APIC_MODE)) { |
| printk(BIOS_INFO, "LAPIC 0x%x in %s mode.\n", lapicid(), |
| use_x2apic ? "X2APIC" : "XAPIC"); |
| } else if (use_x2apic) { |
| msr.lo |= LAPIC_BASE_MSR_X2APIC_MODE; |
| wrmsr(LAPIC_BASE_MSR, msr); |
| msr = rdmsr(LAPIC_BASE_MSR); |
| ASSERT(!!(msr.lo & LAPIC_BASE_MSR_X2APIC_MODE)); |
| printk(BIOS_INFO, "LAPIC 0x%x switched to X2APIC mode.\n", lapicid()); |
| } else { |
| die("Switching from X2APIC to XAPIC mode is not implemented."); |
| } |
| |
| } |
| |
| void disable_lapic(void) |
| { |
| msr_t msr; |
| msr = rdmsr(LAPIC_BASE_MSR); |
| msr.lo &= ~(LAPIC_BASE_MSR_ENABLE | LAPIC_BASE_MSR_X2APIC_MODE); |
| wrmsr(LAPIC_BASE_MSR, msr); |
| } |
| |
| uintptr_t cpu_get_lapic_addr(void) |
| { |
| return LAPIC_DEFAULT_BASE; |
| } |
| |
| /* See if I need to initialize the local APIC */ |
| static int need_lapic_init(void) |
| { |
| return CONFIG(SMP) || CONFIG(IOAPIC); |
| } |
| |
| static void lapic_virtual_wire_mode_init(void) |
| { |
| /* |
| * Set Task Priority to 'accept all'. |
| */ |
| lapic_update32(LAPIC_TASKPRI, ~LAPIC_TPRI_MASK, 0); |
| |
| /* Set spurious interrupt vector to 0 and keep LAPIC enabled to |
| be able to clear LVT register mask bits. */ |
| lapic_update32(LAPIC_SPIV, ~LAPIC_VECTOR_MASK, LAPIC_SPIV_ENABLE); |
| |
| /* Put the local APIC in virtual wire mode */ |
| uint32_t mask = LAPIC_LVT_MASKED | LAPIC_LVT_LEVEL_TRIGGER | LAPIC_INPUT_POLARITY | |
| LAPIC_DELIVERY_MODE_MASK; |
| |
| if (boot_cpu()) |
| lapic_update32(LAPIC_LVT0, ~mask, LAPIC_DELIVERY_MODE_EXTINT); |
| else |
| lapic_update32(LAPIC_LVT0, ~mask, LAPIC_LVT_MASKED | |
| LAPIC_DELIVERY_MODE_EXTINT); |
| |
| lapic_update32(LAPIC_LVT1, ~mask, LAPIC_DELIVERY_MODE_NMI); |
| } |
| |
| void setup_lapic(void) |
| { |
| /* Enable the local APIC */ |
| if (need_lapic_init()) |
| enable_lapic(); |
| else if (!CONFIG(UDELAY_LAPIC)) |
| disable_lapic(); |
| |
| /* This programming is for PIC mode i8259 interrupts to be delivered to CPU |
| while LAPIC is enabled. */ |
| if (need_lapic_init()) |
| lapic_virtual_wire_mode_init(); |
| } |