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/* 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();
}
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