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acrn-hypervisor/hypervisor/arch/x86/lapic.c

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/*
* Copyright (C) 2018 Intel Corporation. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <types.h>
#include <bits.h>
#include <msr.h>
#include <cpu.h>
#include <per_cpu.h>
#include <cpu_caps.h>
#include <lapic.h>
union lapic_base_msr {
uint64_t value;
struct {
uint32_t rsvd_1:8;
uint32_t bsp:1;
uint32_t rsvd_2:1;
uint32_t x2APIC_enable:1;
uint32_t xAPIC_enable:1;
uint32_t lapic_paddr:24;
uint32_t rsvd_3:28;
} fields;
};
static struct lapic_regs saved_lapic_regs;
static union lapic_base_msr saved_lapic_base_msr;
static void clear_lapic_isr(void)
{
uint32_t i;
uint32_t isr_reg;
/* This is a Intel recommended procedure and assures that the processor
* does not get hung up due to already set "in-service" interrupts left
* over from the boot loader environment. This actually occurs in real
* life, therefore we will ensure all the in-service bits are clear.
*/
for (isr_reg = MSR_IA32_EXT_APIC_ISR7; isr_reg >= MSR_IA32_EXT_APIC_ISR0; isr_reg--) {
for (i = 0U; i < 32U; i++) {
if (msr_read(isr_reg) != 0U) {
msr_write(MSR_IA32_EXT_APIC_EOI, 0U);
} else {
break;
}
}
}
}
void early_init_lapic(void)
{
union lapic_base_msr base;
/* Get local APIC base address */
base.value = msr_read(MSR_IA32_APIC_BASE);
/* Enable LAPIC in x2APIC mode*/
/* The following sequence of msr writes to enable x2APIC
* will work irrespective of the state of LAPIC
* left by BIOS
*/
/* Step1: Enable LAPIC in xAPIC mode */
base.fields.xAPIC_enable = 1U;
msr_write(MSR_IA32_APIC_BASE, base.value);
/* Step2: Enable LAPIC in x2APIC mode */
base.fields.x2APIC_enable = 1U;
msr_write(MSR_IA32_APIC_BASE, base.value);
}
/**
* @pre pcpu_id < 8U
*/
void init_lapic(uint16_t pcpu_id)
{
per_cpu(lapic_ldr, pcpu_id) = (uint32_t) msr_read(MSR_IA32_EXT_APIC_LDR);
/* Mask all LAPIC LVT entries before enabling the local APIC */
msr_write(MSR_IA32_EXT_APIC_LVT_CMCI, LAPIC_LVT_MASK);
msr_write(MSR_IA32_EXT_APIC_LVT_TIMER, LAPIC_LVT_MASK);
msr_write(MSR_IA32_EXT_APIC_LVT_THERMAL, LAPIC_LVT_MASK);
msr_write(MSR_IA32_EXT_APIC_LVT_PMI, LAPIC_LVT_MASK);
msr_write(MSR_IA32_EXT_APIC_LVT_LINT0, LAPIC_LVT_MASK);
msr_write(MSR_IA32_EXT_APIC_LVT_LINT1, LAPIC_LVT_MASK);
msr_write(MSR_IA32_EXT_APIC_LVT_ERROR, LAPIC_LVT_MASK);
/* Enable Local APIC */
/* TODO: add spurious-interrupt handler */
msr_write(MSR_IA32_EXT_APIC_SIVR, LAPIC_SVR_APIC_ENABLE_MASK | LAPIC_SVR_VECTOR);
/* Ensure there are no ISR bits set. */
clear_lapic_isr();
}
void save_lapic(struct lapic_regs *regs)
{
regs->tpr.v = (uint32_t) msr_read(MSR_IA32_EXT_APIC_TPR);
regs->ppr.v = (uint32_t) msr_read(MSR_IA32_EXT_APIC_PPR);
regs->tmr[0].v = (uint32_t) msr_read(MSR_IA32_EXT_APIC_TMR0);
regs->tmr[1].v = (uint32_t) msr_read(MSR_IA32_EXT_APIC_TMR1);
regs->tmr[2].v = (uint32_t) msr_read(MSR_IA32_EXT_APIC_TMR2);
regs->tmr[3].v = (uint32_t) msr_read(MSR_IA32_EXT_APIC_TMR3);
regs->tmr[4].v = (uint32_t) msr_read(MSR_IA32_EXT_APIC_TMR4);
regs->tmr[5].v = (uint32_t) msr_read(MSR_IA32_EXT_APIC_TMR5);
regs->tmr[6].v = (uint32_t) msr_read(MSR_IA32_EXT_APIC_TMR6);
regs->tmr[7].v = (uint32_t) msr_read(MSR_IA32_EXT_APIC_TMR7);
regs->svr.v = (uint32_t) msr_read(MSR_IA32_EXT_APIC_SIVR);
regs->lvt[APIC_LVT_TIMER].v =
(uint32_t) msr_read(MSR_IA32_EXT_APIC_LVT_TIMER);
regs->lvt[APIC_LVT_LINT0].v =
(uint32_t) msr_read(MSR_IA32_EXT_APIC_LVT_LINT0);
regs->lvt[APIC_LVT_LINT1].v =
(uint32_t) msr_read(MSR_IA32_EXT_APIC_LVT_LINT1);
regs->lvt[APIC_LVT_ERROR].v =
(uint32_t) msr_read(MSR_IA32_EXT_APIC_LVT_ERROR);
regs->icr_timer.v = (uint32_t) msr_read(MSR_IA32_EXT_APIC_INIT_COUNT);
regs->ccr_timer.v = (uint32_t) msr_read(MSR_IA32_EXT_APIC_CUR_COUNT);
regs->dcr_timer.v =
(uint32_t) msr_read(MSR_IA32_EXT_APIC_DIV_CONF);
}
static void restore_lapic(const struct lapic_regs *regs)
{
msr_write(MSR_IA32_EXT_APIC_TPR, (uint64_t) regs->tpr.v);
msr_write(MSR_IA32_EXT_APIC_SIVR, (uint64_t) regs->svr.v);
msr_write(MSR_IA32_EXT_APIC_LVT_TIMER,
(uint64_t) regs->lvt[APIC_LVT_TIMER].v);
msr_write(MSR_IA32_EXT_APIC_LVT_LINT0,
(uint64_t) regs->lvt[APIC_LVT_LINT0].v);
msr_write(MSR_IA32_EXT_APIC_LVT_LINT1,
(uint64_t) regs->lvt[APIC_LVT_LINT1].v);
msr_write(MSR_IA32_EXT_APIC_LVT_ERROR,
(uint64_t) regs->lvt[APIC_LVT_ERROR].v);
msr_write(MSR_IA32_EXT_APIC_INIT_COUNT, (uint64_t) regs->icr_timer.v);
msr_write(MSR_IA32_EXT_APIC_DIV_CONF, (uint64_t) regs->dcr_timer.v);
}
void suspend_lapic(void)
{
uint64_t val;
saved_lapic_base_msr.value = msr_read(MSR_IA32_APIC_BASE);
save_lapic(&saved_lapic_regs);
/* disable APIC with software flag */
val = msr_read(MSR_IA32_EXT_APIC_SIVR);
val = (~(uint64_t)LAPIC_SVR_APIC_ENABLE_MASK) & val;
msr_write(MSR_IA32_EXT_APIC_SIVR, val);
}
void resume_lapic(void)
{
msr_write(MSR_IA32_APIC_BASE, saved_lapic_base_msr.value);
/* ACPI software flag will be restored also */
restore_lapic(&saved_lapic_regs);
}
void send_lapic_eoi(void)
{
msr_write(MSR_IA32_EXT_APIC_EOI, 0U);
}
uint32_t get_cur_lapic_id(void)
{
uint32_t lapic_id;
lapic_id = (uint32_t) msr_read(MSR_IA32_EXT_XAPICID);
return lapic_id;
}
/**
* @pre cpu_startup_shorthand < INTR_CPU_STARTUP_UNKNOWN
*/
void
send_startup_ipi(enum intr_cpu_startup_shorthand cpu_startup_shorthand,
uint16_t dest_pcpu_id, uint64_t cpu_startup_start_address)
{
union apic_icr icr;
uint8_t shorthand;
struct cpuinfo_x86 *cpu_info = get_cpu_info();
icr.value = 0U;
icr.bits.destination_mode = INTR_LAPIC_ICR_PHYSICAL;
if (cpu_startup_shorthand == INTR_CPU_STARTUP_USE_DEST) {
shorthand = INTR_LAPIC_ICR_USE_DEST_ARRAY;
icr.value_32.hi_32 = per_cpu(lapic_id, dest_pcpu_id);
} else { /* Use destination shorthand */
shorthand = INTR_LAPIC_ICR_ALL_EX_SELF;
icr.value_32.hi_32 = 0U;
}
/* Assert INIT IPI */
icr.bits.shorthand = shorthand;
icr.bits.delivery_mode = INTR_LAPIC_ICR_INIT;
icr.bits.level = INTR_LAPIC_ICR_ASSERT;
icr.bits.trigger_mode = INTR_LAPIC_ICR_LEVEL;
msr_write(MSR_IA32_EXT_APIC_ICR, icr.value);
/* Give 10ms for INIT sequence to complete for old processors.
* Modern processors (family == 6) don't need to wait here.
*/
if (cpu_info->family != 6U) {
/* delay 10ms */
udelay(10000U);
}
/* De-assert INIT IPI */
icr.bits.level = INTR_LAPIC_ICR_DEASSERT;
msr_write(MSR_IA32_EXT_APIC_ICR, icr.value);
/* Send Start IPI with page number of secondary reset code */
icr.value_32.lo_32 = 0U;
icr.bits.shorthand = shorthand;
icr.bits.delivery_mode = INTR_LAPIC_ICR_STARTUP;
icr.bits.vector = (uint8_t)(cpu_startup_start_address >> 12U);
msr_write(MSR_IA32_EXT_APIC_ICR, icr.value);
if (cpu_info->family == 6U) {
udelay(10U); /* 10us is enough for Modern processors */
} else {
udelay(200U); /* 200us for old processors */
}
/* Send another start IPI as per the Intel Arch specification */
msr_write(MSR_IA32_EXT_APIC_ICR, icr.value);
}
void send_dest_ipi_mask(uint32_t dest_mask, uint32_t vector)
{
union apic_icr icr;
uint16_t pcpu_id;
uint32_t mask = dest_mask;
icr.value_32.lo_32 = vector | (INTR_LAPIC_ICR_PHYSICAL << 11U);
pcpu_id = ffs64(mask);
while (pcpu_id != INVALID_BIT_INDEX) {
bitmap32_clear_nolock(pcpu_id, &mask);
if (is_pcpu_active(pcpu_id)) {
icr.value_32.hi_32 = per_cpu(lapic_id, pcpu_id);
msr_write(MSR_IA32_EXT_APIC_ICR, icr.value);
} else {
pr_err("pcpu_id %d not in active!", pcpu_id);
}
pcpu_id = ffs64(mask);
}
}
void send_single_ipi(uint16_t pcpu_id, uint32_t vector)
{
union apic_icr icr;
if (is_pcpu_active(pcpu_id)) {
/* Set the destination field to the target processor. */
icr.value_32.hi_32 = per_cpu(lapic_id, pcpu_id);
/* Write the vector ID to ICR. */
icr.value_32.lo_32 = vector | (INTR_LAPIC_ICR_PHYSICAL << 11U);
msr_write(MSR_IA32_EXT_APIC_ICR, icr.value);
} else {
pr_err("pcpu_id %d not in active!", pcpu_id);
}
}
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