Commit d592d303 authored by bellard's avatar bellard
Browse files

IOAPIC support (initial patch by Filip Navara)


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1520 c046a42c-6fe2-441c-8c8c-71466251a162
parent 1ff5c1a6
......@@ -20,6 +20,7 @@
#include "vl.h"
//#define DEBUG_APIC
//#define DEBUG_IOAPIC
/* APIC Local Vector Table */
#define APIC_LVT_TIMER 0
......@@ -39,6 +40,10 @@
#define APIC_DM_SIPI 6
#define APIC_DM_EXTINT 7
/* APIC destination mode */
#define APIC_DESTMODE_FLAT 0xf
#define APIC_DESTMODE_CLUSTER 1
#define APIC_TRIGGER_EDGE 0
#define APIC_TRIGGER_LEVEL 1
......@@ -49,6 +54,8 @@
#define APIC_INPUT_POLARITY (1<<13)
#define APIC_SEND_PENDING (1<<12)
#define IOAPIC_NUM_PINS 0x18
#define ESR_ILLEGAL_ADDRESS (1 << 7)
#define APIC_SV_ENABLE (1 << 8)
......@@ -57,8 +64,11 @@ typedef struct APICState {
CPUState *cpu_env;
uint32_t apicbase;
uint8_t id;
uint8_t arb_id;
uint8_t tpr;
uint32_t spurious_vec;
uint8_t log_dest;
uint8_t dest_mode;
uint32_t isr[8]; /* in service register */
uint32_t tmr[8]; /* trigger mode register */
uint32_t irr[8]; /* interrupt request register */
......@@ -71,9 +81,65 @@ typedef struct APICState {
uint32_t initial_count;
int64_t initial_count_load_time, next_time;
QEMUTimer *timer;
struct APICState *next_apic;
} APICState;
struct IOAPICState {
uint8_t id;
uint8_t ioregsel;
uint32_t irr;
uint64_t ioredtbl[IOAPIC_NUM_PINS];
};
static int apic_io_memory;
static APICState *first_local_apic = NULL;
static int last_apic_id = 0;
static IOAPICState *ioapic_state;
static void apic_init_ipi(APICState *s);
static void apic_set_irq(APICState *s, int vector_num, int trigger_mode);
static void apic_update_irq(APICState *s);
static void apic_bus_deliver(uint32_t deliver_bitmask, uint8_t delivery_mode,
uint8_t vector_num, uint8_t polarity,
uint8_t trigger_mode)
{
APICState *apic_iter;
switch (delivery_mode) {
case APIC_DM_LOWPRI:
case APIC_DM_FIXED:
/* XXX: arbitration */
break;
case APIC_DM_SMI:
case APIC_DM_NMI:
break;
case APIC_DM_INIT:
/* normal INIT IPI sent to processors */
for (apic_iter = first_local_apic; apic_iter != NULL;
apic_iter = apic_iter->next_apic) {
apic_init_ipi(apic_iter);
}
return;
case APIC_DM_EXTINT:
/* XXX: implement */
break;
default:
return;
}
for (apic_iter = first_local_apic; apic_iter != NULL;
apic_iter = apic_iter->next_apic) {
if (deliver_bitmask & (1 << apic_iter->id))
apic_set_irq(apic_iter, vector_num, trigger_mode);
}
}
void cpu_set_apic_base(CPUState *env, uint64_t val)
{
......@@ -104,6 +170,7 @@ void cpu_set_apic_tpr(CPUX86State *env, uint8_t val)
{
APICState *s = env->apic_state;
s->tpr = (val & 0x0f) << 4;
apic_update_irq(s);
}
uint8_t cpu_get_apic_tpr(CPUX86State *env)
......@@ -112,16 +179,24 @@ uint8_t cpu_get_apic_tpr(CPUX86State *env)
return s->tpr >> 4;
}
/* return -1 if no bit is set */
static int get_highest_priority_int(uint32_t *tab)
int fls_bit(int value)
{
int i;
for(i = 0;i < 8; i++) {
if (tab[i] != 0) {
return i * 32 + ffs(tab[i]) - 1;
}
}
return -1;
unsigned int ret = 0;
#ifdef HOST_I386
__asm__ __volatile__ ("bsr %1, %0\n" : "+r" (ret) : "rm" (value));
return ret;
#else
if (value > 0xffff)
value >>= 16, ret = 16;
if (value > 0xff)
value >>= 8, ret += 8;
if (value > 0xf)
value >>= 4, ret += 4;
if (value > 0x3)
value >>= 2, ret += 2;
return ret + (value >> 1);
#endif
}
static inline void set_bit(uint32_t *tab, int index)
......@@ -140,6 +215,18 @@ static inline void reset_bit(uint32_t *tab, int index)
tab[i] &= ~mask;
}
/* return -1 if no bit is set */
static int get_highest_priority_int(uint32_t *tab)
{
int i;
for(i = 7; i >= 0; i--) {
if (tab[i] != 0) {
return i * 32 + fls_bit(tab[i]);
}
}
return -1;
}
static int apic_get_ppr(APICState *s)
{
int tpr, isrv, ppr;
......@@ -156,16 +243,23 @@ static int apic_get_ppr(APICState *s)
return ppr;
}
static int apic_get_arb_pri(APICState *s)
{
/* XXX: arbitration */
return 0;
}
/* signal the CPU if an irq is pending */
static void apic_update_irq(APICState *s)
{
int irrv, isrv;
int irrv, ppr;
if (!(s->spurious_vec & APIC_SV_ENABLE))
return;
irrv = get_highest_priority_int(s->irr);
if (irrv < 0)
return;
isrv = get_highest_priority_int(s->isr);
/* if the pending irq has less priority, we do not make a new request */
if (isrv >= 0 && irrv >= isrv)
ppr = apic_get_ppr(s);
if (ppr && (irrv & 0xf0) <= (ppr & 0xf0))
return;
cpu_interrupt(s->cpu_env, CPU_INTERRUPT_HARD);
}
......@@ -187,9 +281,116 @@ static void apic_eoi(APICState *s)
if (isrv < 0)
return;
reset_bit(s->isr, isrv);
/* XXX: send the EOI packet to the APIC bus to allow the I/O APIC to
set the remote IRR bit for level triggered interrupts. */
apic_update_irq(s);
}
static uint32_t apic_get_delivery_bitmask(uint8_t dest, uint8_t dest_mode)
{
uint32_t mask = 0;
APICState *apic_iter;
if (dest_mode == 0) {
if (dest == 0xff)
mask = 0xff;
else
mask = 1 << dest;
} else {
/* XXX: cluster mode */
for (apic_iter = first_local_apic; apic_iter != NULL;
apic_iter = apic_iter->next_apic) {
if (dest & apic_iter->log_dest)
mask |= (1 << apic_iter->id);
}
}
return mask;
}
static void apic_init_ipi(APICState *s)
{
int i;
for(i = 0; i < APIC_LVT_NB; i++)
s->lvt[i] = 1 << 16; /* mask LVT */
s->tpr = 0;
s->spurious_vec = 0xff;
s->log_dest = 0;
s->dest_mode = 0;
memset(s->isr, 0, sizeof(s->isr));
memset(s->tmr, 0, sizeof(s->tmr));
memset(s->irr, 0, sizeof(s->irr));
memset(s->lvt, 0, sizeof(s->lvt));
s->esr = 0;
memset(s->icr, 0, sizeof(s->icr));
s->divide_conf = 0;
s->count_shift = 0;
s->initial_count = 0;
s->initial_count_load_time = 0;
s->next_time = 0;
}
static void apic_deliver(APICState *s, uint8_t dest, uint8_t dest_mode,
uint8_t delivery_mode, uint8_t vector_num,
uint8_t polarity, uint8_t trigger_mode)
{
uint32_t deliver_bitmask = 0;
int dest_shorthand = (s->icr[0] >> 18) & 3;
APICState *apic_iter;
switch (delivery_mode) {
case APIC_DM_LOWPRI:
/* XXX: serch for focus processor, arbitration */
dest = s->id;
case APIC_DM_INIT:
{
int trig_mode = (s->icr[0] >> 15) & 1;
int level = (s->icr[0] >> 14) & 1;
if (level == 0 && trig_mode == 1) {
for (apic_iter = first_local_apic; apic_iter != NULL;
apic_iter = apic_iter->next_apic) {
if (deliver_bitmask & (1 << apic_iter->id)) {
apic_iter->arb_id = apic_iter->id;
}
}
return;
}
}
break;
case APIC_DM_SIPI:
for (apic_iter = first_local_apic; apic_iter != NULL;
apic_iter = apic_iter->next_apic) {
if (deliver_bitmask & (1 << apic_iter->id)) {
/* XXX: SMP support */
/* apic_startup(apic_iter); */
}
}
return;
}
switch (dest_shorthand) {
case 0:
deliver_bitmask = apic_get_delivery_bitmask(dest, dest_mode);
break;
case 1:
deliver_bitmask = (1 << s->id);
break;
case 2:
deliver_bitmask = 0xffffffff;
break;
case 3:
deliver_bitmask = 0xffffffff & ~(1 << s->id);
break;
}
apic_bus_deliver(deliver_bitmask, delivery_mode, vector_num, polarity,
trigger_mode);
}
int apic_get_interrupt(CPUState *env)
{
APICState *s = env->apic_state;
......@@ -207,6 +408,8 @@ int apic_get_interrupt(CPUState *env)
if (intno < 0)
return -1;
reset_bit(s->irr, intno);
if (s->tpr && intno <= s->tpr)
return s->spurious_vec & 0xff;
set_bit(s->isr, intno);
apic_update_irq(s);
return intno;
......@@ -220,7 +423,7 @@ static uint32_t apic_get_current_count(APICState *s)
s->count_shift;
if (s->lvt[APIC_LVT_TIMER] & APIC_LVT_TIMER_PERIODIC) {
/* periodic */
val = s->initial_count - (d % (s->initial_count + 1));
val = s->initial_count - (d % ((uint64_t)s->initial_count + 1));
} else {
if (d >= s->initial_count)
val = 0;
......@@ -238,11 +441,11 @@ static void apic_timer_update(APICState *s, int64_t current_time)
d = (current_time - s->initial_count_load_time) >>
s->count_shift;
if (s->lvt[APIC_LVT_TIMER] & APIC_LVT_TIMER_PERIODIC) {
d = ((d / (s->initial_count + 1)) + 1) * (s->initial_count + 1);
d = ((d / ((uint64_t)s->initial_count + 1)) + 1) * ((uint64_t)s->initial_count + 1);
} else {
if (d >= s->initial_count)
goto no_timer;
d = s->initial_count + 1;
d = (uint64_t)s->initial_count + 1;
}
next_time = s->initial_count_load_time + (d << s->count_shift);
qemu_mod_timer(s->timer, next_time);
......@@ -304,10 +507,19 @@ static uint32_t apic_mem_readl(void *opaque, target_phys_addr_t addr)
case 0x08:
val = s->tpr;
break;
case 0x09:
val = apic_get_arb_pri(s);
break;
case 0x0a:
/* ppr */
val = apic_get_ppr(s);
break;
case 0x0d:
val = s->log_dest << 24;
break;
case 0x0e:
val = s->dest_mode << 28;
break;
case 0x0f:
val = s->spurious_vec;
break;
......@@ -372,16 +584,29 @@ static void apic_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
break;
case 0x08:
s->tpr = val;
apic_update_irq(s);
break;
case 0x0b: /* EOI */
apic_eoi(s);
break;
case 0x0d:
s->log_dest = val >> 24;
break;
case 0x0e:
s->dest_mode = val >> 28;
break;
case 0x0f:
s->spurious_vec = val & 0x1ff;
apic_update_irq(s);
break;
case 0x30:
s->icr[0] = val;
apic_deliver(s, (s->icr[1] >> 24) & 0xff, (s->icr[0] >> 11) & 1,
(s->icr[0] >> 8) & 7, (s->icr[0] & 0xff),
(s->icr[0] >> 14) & 1, (s->icr[0] >> 15) & 1);
break;
case 0x31:
s->icr[index & 1] = val;
s->icr[1] = val;
break;
case 0x32 ... 0x37:
{
......@@ -410,7 +635,76 @@ static void apic_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
}
}
static void apic_save(QEMUFile *f, void *opaque)
{
APICState *s = opaque;
int i;
qemu_put_be32s(f, &s->apicbase);
qemu_put_8s(f, &s->id);
qemu_put_8s(f, &s->arb_id);
qemu_put_8s(f, &s->tpr);
qemu_put_be32s(f, &s->spurious_vec);
qemu_put_8s(f, &s->log_dest);
qemu_put_8s(f, &s->dest_mode);
for (i = 0; i < 8; i++) {
qemu_put_be32s(f, &s->isr[i]);
qemu_put_be32s(f, &s->tmr[i]);
qemu_put_be32s(f, &s->irr[i]);
}
for (i = 0; i < APIC_LVT_NB; i++) {
qemu_put_be32s(f, &s->lvt[i]);
}
qemu_put_be32s(f, &s->esr);
qemu_put_be32s(f, &s->icr[0]);
qemu_put_be32s(f, &s->icr[1]);
qemu_put_be32s(f, &s->divide_conf);
qemu_put_be32s(f, &s->count_shift);
qemu_put_be32s(f, &s->initial_count);
qemu_put_be64s(f, &s->initial_count_load_time);
qemu_put_be64s(f, &s->next_time);
}
static int apic_load(QEMUFile *f, void *opaque, int version_id)
{
APICState *s = opaque;
int i;
if (version_id != 1)
return -EINVAL;
/* XXX: what if the base changes? (registered memory regions) */
qemu_get_be32s(f, &s->apicbase);
qemu_get_8s(f, &s->id);
qemu_get_8s(f, &s->arb_id);
qemu_get_8s(f, &s->tpr);
qemu_get_be32s(f, &s->spurious_vec);
qemu_get_8s(f, &s->log_dest);
qemu_get_8s(f, &s->dest_mode);
for (i = 0; i < 8; i++) {
qemu_get_be32s(f, &s->isr[i]);
qemu_get_be32s(f, &s->tmr[i]);
qemu_get_be32s(f, &s->irr[i]);
}
for (i = 0; i < APIC_LVT_NB; i++) {
qemu_get_be32s(f, &s->lvt[i]);
}
qemu_get_be32s(f, &s->esr);
qemu_get_be32s(f, &s->icr[0]);
qemu_get_be32s(f, &s->icr[1]);
qemu_get_be32s(f, &s->divide_conf);
qemu_get_be32s(f, &s->count_shift);
qemu_get_be32s(f, &s->initial_count);
qemu_get_be64s(f, &s->initial_count_load_time);
qemu_get_be64s(f, &s->next_time);
return 0;
}
static void apic_reset(void *opaque)
{
APICState *s = opaque;
apic_init_ipi(s);
}
static CPUReadMemoryFunc *apic_mem_read[3] = {
apic_mem_readb,
......@@ -427,27 +721,228 @@ static CPUWriteMemoryFunc *apic_mem_write[3] = {
int apic_init(CPUState *env)
{
APICState *s;
int i;
s = malloc(sizeof(APICState));
s = qemu_mallocz(sizeof(APICState));
if (!s)
return -1;
memset(s, 0, sizeof(*s));
env->apic_state = s;
apic_init_ipi(s);
s->id = last_apic_id++;
s->cpu_env = env;
s->apicbase = 0xfee00000 |
MSR_IA32_APICBASE_BSP | MSR_IA32_APICBASE_ENABLE;
for(i = 0; i < APIC_LVT_NB; i++)
s->lvt[i] = 1 << 16; /* mask LVT */
s->spurious_vec = 0xff;
(s->id ? 0 : MSR_IA32_APICBASE_BSP) | MSR_IA32_APICBASE_ENABLE;
/* XXX: mapping more APICs at the same memory location */
if (apic_io_memory == 0) {
/* NOTE: the APIC is directly connected to the CPU - it is not
on the global memory bus. */
apic_io_memory = cpu_register_io_memory(0, apic_mem_read,
apic_mem_write, NULL);
cpu_register_physical_memory(s->apicbase & ~0xfff, 0x1000, apic_io_memory);
cpu_register_physical_memory(s->apicbase & ~0xfff, 0x1000,
apic_io_memory);
}
s->timer = qemu_new_timer(vm_clock, apic_timer, s);
register_savevm("apic", 0, 1, apic_save, apic_load, s);
qemu_register_reset(apic_reset, s);
s->next_apic = first_local_apic;
first_local_apic = s;
return 0;
}
static void ioapic_service(IOAPICState *s)
{
uint8_t vector;
uint32_t mask;
uint64_t entry;
uint8_t dest;
uint8_t dest_mode;
for (vector = 0; vector < IOAPIC_NUM_PINS; vector++) {
mask = 1 << vector;
if (s->irr & mask) {
entry = s->ioredtbl[vector];
if (!(entry & APIC_LVT_MASKED)) {
if (!((entry >> 15) & 1))
s->irr &= ~mask;
dest = entry >> 56;
dest_mode = (entry >> 11) & 1;
apic_bus_deliver(apic_get_delivery_bitmask(dest, dest_mode),
(entry >> 8) & 7, entry & 0xff,
(entry >> 13) & 1, (entry >> 15) & 1);
}
}
}
}
void ioapic_set_irq(void *opaque, int vector, int level)
{
IOAPICState *s = opaque;
if (vector >= 0 && vector < IOAPIC_NUM_PINS) {
uint32_t mask = 1 << vector;
uint64_t entry = s->ioredtbl[vector];
if ((entry >> 15) & 1) {
/* level triggered */
if (level) {
s->irr |= mask;
ioapic_service(s);
} else {
s->irr &= ~mask;
}
} else {
/* edge triggered */
if (level) {
s->irr |= mask;
ioapic_service(s);
}
}
}
}
static uint32_t ioapic_mem_readl(void *opaque, target_phys_addr_t addr)
{
IOAPICState *s = opaque;
int index;
uint32_t val = 0;
addr &= 0xff;
if (addr == 0x00) {
val = s->ioregsel;
} else if (addr == 0x10) {
switch (s->ioregsel) {
case 0x00:
val = s->id << 24;
break;
case 0x01:
val = 0x11 | ((IOAPIC_NUM_PINS - 1) << 16); /* version 0x11 */
break;
case 0x02:
val = 0;
break;
default:
index = (s->ioregsel - 0x10) >> 1;
if (index >= 0 && index < IOAPIC_NUM_PINS) {
if (s->ioregsel & 1)
val = s->ioredtbl[index] >> 32;
else
val = s->ioredtbl[index] & 0xffffffff;
}
}
#ifdef DEBUG_IOAPIC
printf("I/O APIC read: %08x = %08x\n", s->ioregsel, val);
#endif
}
return val;
}
static void ioapic_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
{
IOAPICState *s = opaque;
int index;
addr &= 0xff;
if (addr == 0x00) {
s->ioregsel = val;
return;
} else if (addr == 0x10) {
#ifdef DEBUG_IOAPIC
printf("I/O APIC write: %08x = %08x\n", s->ioregsel, val);
#endif
switch (s->ioregsel) {
case 0x00:
s->id = (val >> 24) & 0xff;
return;
case 0x01:
case 0x02:
return;
default:
index = (s->ioregsel - 0x10) >> 1;
if (index >= 0 && index < IOAPIC_NUM_PINS) {
if (s->ioregsel & 1) {
s->ioredtbl[index] &= 0xffffffff;
s->ioredtbl[index] |= (uint64_t)val << 32;
} else {
s->ioredtbl[index] &= ~0xffffffffULL;
s->ioredtbl[index] |= val;
}
ioapic_service(s);
}
}
}
}
static void ioapic_save(QEMUFile *f, void *opaque)
{
IOAPICState *s = opaque;