#include <mach/mach_types.h>
#include <mach/kern_return.h>
#include <kern/kern_types.h>
#include <kern/cpu_number.h>
#include <kern/cpu_data.h>
#include <kern/assert.h>
#include <kern/machine.h>
#include <vm/vm_map.h>
#include <vm/vm_kern.h>
#include <i386/lapic.h>
#include <i386/cpuid.h>
#include <i386/proc_reg.h>
#include <i386/machine_cpu.h>
#include <i386/misc_protos.h>
#include <i386/mp.h>
#include <i386/mtrr.h>
#include <i386/postcode.h>
#include <i386/cpu_threads.h>
#include <i386/machine_routines.h>
#if CONFIG_MCA
#include <i386/machine_check.h>
#endif
#if CONFIG_COUNTERS
#include <pmc/pmc.h>
#endif
#if MACH_KDB
#include <machine/db_machdep.h>
#endif
#include <sys/kdebug.h>
#if MP_DEBUG
#define PAUSE delay(1000000)
#define DBG(x...) kprintf(x)
#else
#define DBG(x...)
#define PAUSE
#endif
unsigned long lapic_id_initdata = 0;
unsigned long lapic_id = (unsigned long)&lapic_id_initdata;
vm_offset_t lapic_start;
static i386_intr_func_t lapic_intr_func[LAPIC_FUNC_TABLE_SIZE];
static boolean_t lapic_os_enabled = FALSE;
static boolean_t lapic_errors_masked = FALSE;
static uint64_t lapic_last_master_error = 0;
static uint64_t lapic_error_time_threshold = 0;
static unsigned lapic_master_error_count = 0;
static unsigned lapic_error_count_threshold = 5;
static boolean_t lapic_dont_panic = FALSE;
extern int debug_boot_arg;
int lapic_interrupt_base = LAPIC_DEFAULT_INTERRUPT_BASE;
int lapic_to_cpu[MAX_CPUS];
int cpu_to_lapic[MAX_CPUS];
static void
lapic_cpu_map_init(void)
{
int i;
for (i = 0; i < MAX_CPUS; i++) {
lapic_to_cpu[i] = -1;
cpu_to_lapic[i] = -1;
}
}
void
lapic_cpu_map(int apic_id, int cpu)
{
cpu_to_lapic[cpu] = apic_id;
lapic_to_cpu[apic_id] = cpu;
}
uint32_t
ml_get_apicid(uint32_t cpu)
{
if(cpu >= (uint32_t)MAX_CPUS)
return 0xFFFFFFFF;
return (uint32_t)cpu_to_lapic[cpu];
}
uint32_t
ml_get_cpuid(uint32_t lapic_index)
{
if(lapic_index >= (uint32_t)MAX_CPUS)
return 0xFFFFFFFF;
return (uint32_t)lapic_to_cpu[lapic_index];
}
#ifdef MP_DEBUG
static void
lapic_cpu_map_dump(void)
{
int i;
for (i = 0; i < MAX_CPUS; i++) {
if (cpu_to_lapic[i] == -1)
continue;
kprintf("cpu_to_lapic[%d]: %d\n",
i, cpu_to_lapic[i]);
}
for (i = 0; i < MAX_CPUS; i++) {
if (lapic_to_cpu[i] == -1)
continue;
kprintf("lapic_to_cpu[%d]: %d\n",
i, lapic_to_cpu[i]);
}
}
#endif
void
lapic_init(void)
{
int result;
vm_map_entry_t entry;
uint32_t lo;
uint32_t hi;
boolean_t is_boot_processor;
boolean_t is_lapic_enabled;
vm_offset_t lapic_base;
rdmsr(MSR_IA32_APIC_BASE, lo, hi);
is_boot_processor = (lo & MSR_IA32_APIC_BASE_BSP) != 0;
is_lapic_enabled = (lo & MSR_IA32_APIC_BASE_ENABLE) != 0;
lapic_base = (lo & MSR_IA32_APIC_BASE_BASE);
kprintf("MSR_IA32_APIC_BASE %p %s %s\n", (void *) lapic_base,
is_lapic_enabled ? "enabled" : "disabled",
is_boot_processor ? "BSP" : "AP");
if (!is_boot_processor || !is_lapic_enabled)
panic("Unexpected local APIC state\n");
lapic_start = (vm_offset_t)vm_map_min(kernel_map);
result = vm_map_find_space(kernel_map,
(vm_map_address_t *) &lapic_start,
round_page(LAPIC_SIZE), 0,
VM_MAKE_TAG(VM_MEMORY_IOKIT), &entry);
if (result != KERN_SUCCESS) {
panic("smp_init: vm_map_find_entry FAILED (err=%d)", result);
}
vm_map_unlock(kernel_map);
pmap_enter(pmap_kernel(),
lapic_start,
(ppnum_t) i386_btop(lapic_base),
VM_PROT_READ|VM_PROT_WRITE,
VM_WIMG_IO,
TRUE);
lapic_id = (unsigned long)(lapic_start + LAPIC_ID);
if ((LAPIC_READ(VERSION)&LAPIC_VERSION_MASK) < 0x14) {
panic("Local APIC version 0x%x, 0x14 or more expected\n",
(LAPIC_READ(VERSION)&LAPIC_VERSION_MASK));
}
lapic_cpu_map_init();
lapic_cpu_map((LAPIC_READ(ID)>>LAPIC_ID_SHIFT)&LAPIC_ID_MASK, 0);
kprintf("Boot cpu local APIC id 0x%x\n", cpu_to_lapic[0]);
}
static int
lapic_esr_read(void)
{
LAPIC_WRITE(ERROR_STATUS, 0);
return LAPIC_READ(ERROR_STATUS);
}
static void
lapic_esr_clear(void)
{
LAPIC_WRITE(ERROR_STATUS, 0);
LAPIC_WRITE(ERROR_STATUS, 0);
}
static const char *DM_str[8] = {
"Fixed",
"Lowest Priority",
"Invalid",
"Invalid",
"NMI",
"Reset",
"Invalid",
"ExtINT"};
void
lapic_dump(void)
{
int i;
#define BOOL(a) ((a)?' ':'!')
#define VEC(lvt) \
LAPIC_READ(lvt)&LAPIC_LVT_VECTOR_MASK
#define DS(lvt) \
(LAPIC_READ(lvt)&LAPIC_LVT_DS_PENDING)?" SendPending" : "Idle"
#define DM(lvt) \
DM_str[(LAPIC_READ(lvt)>>LAPIC_LVT_DM_SHIFT)&LAPIC_LVT_DM_MASK]
#define MASK(lvt) \
BOOL(LAPIC_READ(lvt)&LAPIC_LVT_MASKED)
#define TM(lvt) \
(LAPIC_READ(lvt)&LAPIC_LVT_TM_LEVEL)? "Level" : "Edge"
#define IP(lvt) \
(LAPIC_READ(lvt)&LAPIC_LVT_IP_PLRITY_LOW)? "Low " : "High"
kprintf("LAPIC %d at %p version 0x%x\n",
(LAPIC_READ(ID)>>LAPIC_ID_SHIFT)&LAPIC_ID_MASK,
(void *) lapic_start,
LAPIC_READ(VERSION)&LAPIC_VERSION_MASK);
kprintf("Priorities: Task 0x%x Arbitration 0x%x Processor 0x%x\n",
LAPIC_READ(TPR)&LAPIC_TPR_MASK,
LAPIC_READ(APR)&LAPIC_APR_MASK,
LAPIC_READ(PPR)&LAPIC_PPR_MASK);
kprintf("Destination Format 0x%x Logical Destination 0x%x\n",
LAPIC_READ(DFR)>>LAPIC_DFR_SHIFT,
LAPIC_READ(LDR)>>LAPIC_LDR_SHIFT);
kprintf("%cEnabled %cFocusChecking SV 0x%x\n",
BOOL(LAPIC_READ(SVR)&LAPIC_SVR_ENABLE),
BOOL(!(LAPIC_READ(SVR)&LAPIC_SVR_FOCUS_OFF)),
LAPIC_READ(SVR) & LAPIC_SVR_MASK);
#if CONFIG_MCA
if (mca_is_cmci_present())
kprintf("LVT_CMCI: Vector 0x%02x [%s] %s %cmasked\n",
VEC(LVT_CMCI),
DM(LVT_CMCI),
DS(LVT_CMCI),
MASK(LVT_CMCI));
#endif
kprintf("LVT_TIMER: Vector 0x%02x %s %cmasked %s\n",
VEC(LVT_TIMER),
DS(LVT_TIMER),
MASK(LVT_TIMER),
(LAPIC_READ(LVT_TIMER)&LAPIC_LVT_PERIODIC)?"Periodic":"OneShot");
kprintf(" Initial Count: 0x%08x \n", LAPIC_READ(TIMER_INITIAL_COUNT));
kprintf(" Current Count: 0x%08x \n", LAPIC_READ(TIMER_CURRENT_COUNT));
kprintf(" Divide Config: 0x%08x \n", LAPIC_READ(TIMER_DIVIDE_CONFIG));
kprintf("LVT_PERFCNT: Vector 0x%02x [%s] %s %cmasked\n",
VEC(LVT_PERFCNT),
DM(LVT_PERFCNT),
DS(LVT_PERFCNT),
MASK(LVT_PERFCNT));
kprintf("LVT_THERMAL: Vector 0x%02x [%s] %s %cmasked\n",
VEC(LVT_THERMAL),
DM(LVT_THERMAL),
DS(LVT_THERMAL),
MASK(LVT_THERMAL));
kprintf("LVT_LINT0: Vector 0x%02x [%s][%s][%s] %s %cmasked\n",
VEC(LVT_LINT0),
DM(LVT_LINT0),
TM(LVT_LINT0),
IP(LVT_LINT0),
DS(LVT_LINT0),
MASK(LVT_LINT0));
kprintf("LVT_LINT1: Vector 0x%02x [%s][%s][%s] %s %cmasked\n",
VEC(LVT_LINT1),
DM(LVT_LINT1),
TM(LVT_LINT1),
IP(LVT_LINT1),
DS(LVT_LINT1),
MASK(LVT_LINT1));
kprintf("LVT_ERROR: Vector 0x%02x %s %cmasked\n",
VEC(LVT_ERROR),
DS(LVT_ERROR),
MASK(LVT_ERROR));
kprintf("ESR: %08x \n", lapic_esr_read());
kprintf(" ");
for(i=0xf; i>=0; i--)
kprintf("%x%x%x%x",i,i,i,i);
kprintf("\n");
kprintf("TMR: 0x");
for(i=7; i>=0; i--)
kprintf("%08x",LAPIC_READ_OFFSET(TMR_BASE, i*0x10));
kprintf("\n");
kprintf("IRR: 0x");
for(i=7; i>=0; i--)
kprintf("%08x",LAPIC_READ_OFFSET(IRR_BASE, i*0x10));
kprintf("\n");
kprintf("ISR: 0x");
for(i=7; i >= 0; i--)
kprintf("%08x",LAPIC_READ_OFFSET(ISR_BASE, i*0x10));
kprintf("\n");
}
#if MACH_KDB
void
db_apic(__unused db_expr_t addr,
__unused int have_addr,
__unused db_expr_t count,
__unused char *modif)
{
lapic_dump();
return;
}
#endif
boolean_t
lapic_probe(void)
{
uint32_t lo;
uint32_t hi;
if (cpuid_features() & CPUID_FEATURE_APIC)
return TRUE;
if (cpuid_family() == 6 || cpuid_family() == 15) {
rdmsr(MSR_IA32_APIC_BASE, lo, hi);
lo &= ~MSR_IA32_APIC_BASE_BASE;
lo |= MSR_IA32_APIC_BASE_ENABLE | LAPIC_START;
lo |= MSR_IA32_APIC_BASE_ENABLE;
wrmsr(MSR_IA32_APIC_BASE, lo, hi);
cpuid_set_info();
if (cpuid_features() & CPUID_FEATURE_APIC) {
printf("Local APIC discovered and enabled\n");
lapic_os_enabled = TRUE;
lapic_interrupt_base = LAPIC_REDUCED_INTERRUPT_BASE;
return TRUE;
}
}
return FALSE;
}
void
lapic_shutdown(void)
{
uint32_t lo;
uint32_t hi;
uint32_t value;
if (lapic_os_enabled == FALSE)
return;
mp_disable_preemption();
if (get_cpu_number() == master_cpu) {
value = LAPIC_READ(LVT_LINT0);
value |= LAPIC_LVT_MASKED;
LAPIC_WRITE(LVT_LINT0, value);
}
LAPIC_WRITE(LVT_ERROR, LAPIC_READ(LVT_ERROR) | LAPIC_LVT_MASKED);
LAPIC_WRITE(LVT_TIMER, LAPIC_READ(LVT_TIMER) | LAPIC_LVT_MASKED);
LAPIC_WRITE(LVT_PERFCNT, LAPIC_READ(LVT_PERFCNT) | LAPIC_LVT_MASKED);
LAPIC_WRITE(SVR, LAPIC_READ(SVR) & ~LAPIC_SVR_ENABLE);
rdmsr(MSR_IA32_APIC_BASE, lo, hi);
lo &= ~MSR_IA32_APIC_BASE_ENABLE;
wrmsr(MSR_IA32_APIC_BASE, lo, hi);
cpuid_set_info();
mp_enable_preemption();
}
void
lapic_configure(void)
{
int value;
if (lapic_error_time_threshold == 0 && cpu_number() == 0) {
nanoseconds_to_absolutetime(NSEC_PER_SEC >> 2, &lapic_error_time_threshold);
if (!PE_parse_boot_argn("lapic_dont_panic", &lapic_dont_panic, sizeof(lapic_dont_panic))) {
lapic_dont_panic = FALSE;
}
}
LAPIC_WRITE(DFR, LAPIC_DFR_FLAT);
LAPIC_WRITE(LDR, (get_cpu_number()) << LAPIC_LDR_SHIFT);
LAPIC_WRITE(TPR, 0);
LAPIC_WRITE(SVR, LAPIC_VECTOR(SPURIOUS) | LAPIC_SVR_ENABLE);
if (get_cpu_number() == master_cpu) {
value = LAPIC_READ(LVT_LINT0);
value &= ~LAPIC_LVT_MASKED;
value |= LAPIC_LVT_DM_EXTINT;
LAPIC_WRITE(LVT_LINT0, value);
}
LAPIC_WRITE(LVT_TIMER, LAPIC_VECTOR(TIMER));
LAPIC_WRITE(LVT_PERFCNT, LAPIC_VECTOR(PERFCNT));
LAPIC_WRITE(LVT_THERMAL, LAPIC_VECTOR(THERMAL));
#if CONFIG_MCA
if (mca_is_cmci_present())
LAPIC_WRITE(LVT_CMCI, LAPIC_VECTOR(CMCI));
#endif
if (((cpu_number() == master_cpu) && lapic_errors_masked == FALSE) ||
(cpu_number() != master_cpu)) {
lapic_esr_clear();
LAPIC_WRITE(LVT_ERROR, LAPIC_VECTOR(ERROR));
}
}
void
lapic_set_timer(
boolean_t interrupt_unmasked,
lapic_timer_mode_t mode,
lapic_timer_divide_t divisor,
lapic_timer_count_t initial_count)
{
boolean_t state;
uint32_t timer_vector;
state = ml_set_interrupts_enabled(FALSE);
timer_vector = LAPIC_READ(LVT_TIMER);
timer_vector &= ~(LAPIC_LVT_MASKED|LAPIC_LVT_PERIODIC);;
timer_vector |= interrupt_unmasked ? 0 : LAPIC_LVT_MASKED;
timer_vector |= (mode == periodic) ? LAPIC_LVT_PERIODIC : 0;
LAPIC_WRITE(LVT_TIMER, timer_vector);
LAPIC_WRITE(TIMER_DIVIDE_CONFIG, divisor);
LAPIC_WRITE(TIMER_INITIAL_COUNT, initial_count);
ml_set_interrupts_enabled(state);
}
void
lapic_get_timer(
lapic_timer_mode_t *mode,
lapic_timer_divide_t *divisor,
lapic_timer_count_t *initial_count,
lapic_timer_count_t *current_count)
{
boolean_t state;
state = ml_set_interrupts_enabled(FALSE);
if (mode)
*mode = (LAPIC_READ(LVT_TIMER) & LAPIC_LVT_PERIODIC) ?
periodic : one_shot;
if (divisor)
*divisor = LAPIC_READ(TIMER_DIVIDE_CONFIG) & LAPIC_TIMER_DIVIDE_MASK;
if (initial_count)
*initial_count = LAPIC_READ(TIMER_INITIAL_COUNT);
if (current_count)
*current_count = LAPIC_READ(TIMER_CURRENT_COUNT);
ml_set_interrupts_enabled(state);
}
static inline void
_lapic_end_of_interrupt(void)
{
LAPIC_WRITE(EOI, 0);
}
void
lapic_end_of_interrupt(void)
{
_lapic_end_of_interrupt();
}
void lapic_unmask_perfcnt_interrupt(void) {
LAPIC_WRITE(LVT_PERFCNT, LAPIC_VECTOR(PERFCNT));
}
void
lapic_set_intr_func(int vector, i386_intr_func_t func)
{
if (vector > lapic_interrupt_base)
vector -= lapic_interrupt_base;
switch (vector) {
case LAPIC_NMI_INTERRUPT:
case LAPIC_INTERPROCESSOR_INTERRUPT:
case LAPIC_TIMER_INTERRUPT:
case LAPIC_THERMAL_INTERRUPT:
case LAPIC_PERFCNT_INTERRUPT:
case LAPIC_CMCI_INTERRUPT:
case LAPIC_PM_INTERRUPT:
lapic_intr_func[vector] = func;
break;
default:
panic("lapic_set_intr_func(%d,%p) invalid vector\n",
vector, func);
}
}
int
lapic_interrupt(int interrupt_num, x86_saved_state_t *state)
{
int retval = 0;
int esr = -1;
interrupt_num -= lapic_interrupt_base;
if (interrupt_num < 0) {
if (interrupt_num == (LAPIC_NMI_INTERRUPT - lapic_interrupt_base) &&
lapic_intr_func[LAPIC_NMI_INTERRUPT] != NULL) {
retval = (*lapic_intr_func[LAPIC_NMI_INTERRUPT])(state);
_lapic_end_of_interrupt();
return retval;
}
else
return 0;
}
switch(interrupt_num) {
case LAPIC_TIMER_INTERRUPT:
case LAPIC_THERMAL_INTERRUPT:
case LAPIC_INTERPROCESSOR_INTERRUPT:
case LAPIC_PM_INTERRUPT:
if (lapic_intr_func[interrupt_num] != NULL)
(void) (*lapic_intr_func[interrupt_num])(state);
_lapic_end_of_interrupt();
retval = 1;
break;
case LAPIC_PERFCNT_INTERRUPT:
if (lapic_intr_func[interrupt_num] != NULL) {
(void) (*lapic_intr_func[interrupt_num])(state);
lapic_unmask_perfcnt_interrupt();
_lapic_end_of_interrupt();
retval = 1;
}
break;
case LAPIC_CMCI_INTERRUPT:
if (lapic_intr_func[interrupt_num] != NULL)
(void) (*lapic_intr_func[interrupt_num])(state);
break;
case LAPIC_ERROR_INTERRUPT:
esr = lapic_esr_read();
lapic_dump();
if ((debug_boot_arg && (lapic_dont_panic == FALSE)) ||
cpu_number() != master_cpu) {
panic("Local APIC error, ESR: %d\n", esr);
}
if (cpu_number() == master_cpu) {
uint64_t abstime = mach_absolute_time();
if ((abstime - lapic_last_master_error) < lapic_error_time_threshold) {
if (lapic_master_error_count++ > lapic_error_count_threshold) {
lapic_errors_masked = TRUE;
LAPIC_WRITE(LVT_ERROR, LAPIC_READ(LVT_ERROR) | LAPIC_LVT_MASKED);
printf("Local APIC: errors masked\n");
}
}
else {
lapic_last_master_error = abstime;
lapic_master_error_count = 0;
}
printf("Local APIC error on master CPU, ESR: %d, error count this run: %d\n", esr, lapic_master_error_count);
}
_lapic_end_of_interrupt();
retval = 1;
break;
case LAPIC_SPURIOUS_INTERRUPT:
kprintf("SPIV\n");
retval = 1;
break;
case LAPIC_PMC_SW_INTERRUPT:
{
#if CONFIG_COUNTERS
thread_t old, new;
ml_get_csw_threads(&old, &new);
if (pmc_context_switch(old, new) == TRUE) {
retval = 1;
}
#endif
}
break;
}
return retval;
}
void
lapic_smm_restore(void)
{
boolean_t state;
if (lapic_os_enabled == FALSE)
return;
state = ml_set_interrupts_enabled(FALSE);
if (LAPIC_ISR_IS_SET(LAPIC_REDUCED_INTERRUPT_BASE, TIMER)) {
_lapic_end_of_interrupt();
if (LAPIC_READ(TIMER_CURRENT_COUNT) == 0) {
LAPIC_WRITE(TIMER_INITIAL_COUNT, 1);
}
kprintf("lapic_smm_restore\n");
}
ml_set_interrupts_enabled(state);
}
void
lapic_send_ipi(int cpu, int vector)
{
boolean_t state;
if (vector < lapic_interrupt_base)
vector += lapic_interrupt_base;
state = ml_set_interrupts_enabled(FALSE);
while (LAPIC_READ(ICR) & LAPIC_ICR_DS_PENDING) {
cpu_pause();
}
LAPIC_WRITE(ICRD, cpu_to_lapic[cpu] << LAPIC_ICRD_DEST_SHIFT);
LAPIC_WRITE(ICR, vector | LAPIC_ICR_DM_FIXED);
(void) ml_set_interrupts_enabled(state);
}