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/* SPDX-License-Identifier: GPL-2.0-only */
#include <cpu/x86/lapic.h>
#include <cpu/x86/lapic_def.h>
#include <cpu/x86/msr.h>
#include <console/console.h>
#include <stdint.h>
void enable_lapic(void)
{
msr_t msr;
msr = rdmsr(LAPIC_BASE_MSR);
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);
}
void disable_lapic(void)
{
msr_t msr;
msr = rdmsr(LAPIC_BASE_MSR);
msr.lo &= ~LAPIC_BASE_MSR_ENABLE;
wrmsr(LAPIC_BASE_MSR, msr);
}
/* 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)
{
/* this is so interrupts work. This is very limited scope --
* linux will do better later, we hope ...
*/
/* this is the first way we learned to do it. It fails on real SMP
* stuff. So we have to do things differently ...
* see the Intel mp1.4 spec, page A-3
*/
printk(BIOS_INFO, "Setting up local APIC...\n");
/* Enable the local APIC */
enable_lapic();
/*
* Set Task Priority to 'accept all'.
*/
lapic_update32(LAPIC_TASKPRI, ~LAPIC_TPRI_MASK, 0);
/* Put the local APIC in virtual wire mode */
lapic_update32(LAPIC_SPIV, ~LAPIC_VECTOR_MASK, LAPIC_SPIV_ENABLE);
uint32_t mask = LAPIC_LVT_MASKED | LAPIC_LVT_LEVEL_TRIGGER | LAPIC_LVT_REMOTE_IRR |
LAPIC_INPUT_POLARITY | LAPIC_SEND_PENDING | LAPIC_LVT_RESERVED_1 |
LAPIC_DELIVERY_MODE_MASK;
lapic_update32(LAPIC_LVT0, ~mask, LAPIC_LVT_REMOTE_IRR | LAPIC_SEND_PENDING |
LAPIC_DELIVERY_MODE_EXTINT);
lapic_update32(LAPIC_LVT1, ~mask, LAPIC_LVT_REMOTE_IRR | LAPIC_SEND_PENDING |
LAPIC_DELIVERY_MODE_NMI);
printk(BIOS_DEBUG, " apic_id: 0x%x ", lapicid());
printk(BIOS_INFO, "done.\n");
}
void setup_lapic(void)
{
if (need_lapic_init())
lapic_virtual_wire_mode_init();
else
disable_lapic();
}
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