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qemu/hw/apic.c

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/*
* APIC support
*
* Copyright (c) 2004-2005 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA
*/
#include "hw.h"
#include "pc.h"
#include "qemu-timer.h"
#include "host-utils.h"
//#define DEBUG_APIC
/* APIC Local Vector Table */
#define APIC_LVT_TIMER 0
#define APIC_LVT_THERMAL 1
#define APIC_LVT_PERFORM 2
#define APIC_LVT_LINT0 3
#define APIC_LVT_LINT1 4
#define APIC_LVT_ERROR 5
#define APIC_LVT_NB 6
/* APIC delivery modes */
#define APIC_DM_FIXED 0
#define APIC_DM_LOWPRI 1
#define APIC_DM_SMI 2
#define APIC_DM_NMI 4
#define APIC_DM_INIT 5
#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
#define APIC_LVT_TIMER_PERIODIC (1<<17)
#define APIC_LVT_MASKED (1<<16)
#define APIC_LVT_LEVEL_TRIGGER (1<<15)
#define APIC_LVT_REMOTE_IRR (1<<14)
#define APIC_INPUT_POLARITY (1<<13)
#define APIC_SEND_PENDING (1<<12)
#define ESR_ILLEGAL_ADDRESS (1 << 7)
#define APIC_SV_ENABLE (1 << 8)
#define MAX_APICS 255
#define MAX_APIC_WORDS 8
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 */
uint32_t lvt[APIC_LVT_NB];
uint32_t esr; /* error register */
uint32_t icr[2];
uint32_t divide_conf;
int count_shift;
uint32_t initial_count;
int64_t initial_count_load_time, next_time;
QEMUTimer *timer;
} APICState;
static int apic_io_memory;
static APICState *local_apics[MAX_APICS + 1];
static int last_apic_id = 0;
static int apic_irq_delivered;
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_get_delivery_bitmask(uint32_t *deliver_bitmask,
uint8_t dest, uint8_t dest_mode);
/* Find first bit starting from msb */
static int fls_bit(uint32_t value)
{
return 31 - clz32(value);
}
/* Find first bit starting from lsb */
static int ffs_bit(uint32_t value)
{
return ctz32(value);
}
static inline void set_bit(uint32_t *tab, int index)
{
int i, mask;
i = index >> 5;
mask = 1 << (index & 0x1f);
tab[i] |= mask;
}
static inline void reset_bit(uint32_t *tab, int index)
{
int i, mask;
i = index >> 5;
mask = 1 << (index & 0x1f);
tab[i] &= ~mask;
}
static inline int get_bit(uint32_t *tab, int index)
{
int i, mask;
i = index >> 5;
mask = 1 << (index & 0x1f);
return !!(tab[i] & mask);
}
static void apic_local_deliver(CPUState *env, int vector)
{
APICState *s = env->apic_state;
uint32_t lvt = s->lvt[vector];
int trigger_mode;
if (lvt & APIC_LVT_MASKED)
return;
switch ((lvt >> 8) & 7) {
case APIC_DM_SMI:
cpu_interrupt(env, CPU_INTERRUPT_SMI);
break;
case APIC_DM_NMI:
cpu_interrupt(env, CPU_INTERRUPT_NMI);
break;
case APIC_DM_EXTINT:
cpu_interrupt(env, CPU_INTERRUPT_HARD);
break;
case APIC_DM_FIXED:
trigger_mode = APIC_TRIGGER_EDGE;
if ((vector == APIC_LVT_LINT0 || vector == APIC_LVT_LINT1) &&
(lvt & APIC_LVT_LEVEL_TRIGGER))
trigger_mode = APIC_TRIGGER_LEVEL;
apic_set_irq(s, lvt & 0xff, trigger_mode);
}
}
void apic_deliver_pic_intr(CPUState *env, int level)
{
if (level)
apic_local_deliver(env, APIC_LVT_LINT0);
else {
APICState *s = env->apic_state;
uint32_t lvt = s->lvt[APIC_LVT_LINT0];
switch ((lvt >> 8) & 7) {
case APIC_DM_FIXED:
if (!(lvt & APIC_LVT_LEVEL_TRIGGER))
break;
reset_bit(s->irr, lvt & 0xff);
/* fall through */
case APIC_DM_EXTINT:
cpu_reset_interrupt(env, CPU_INTERRUPT_HARD);
break;
}
}
}
#define foreach_apic(apic, deliver_bitmask, code) \
{\
int __i, __j, __mask;\
for(__i = 0; __i < MAX_APIC_WORDS; __i++) {\
__mask = deliver_bitmask[__i];\
if (__mask) {\
for(__j = 0; __j < 32; __j++) {\
if (__mask & (1 << __j)) {\
apic = local_apics[__i * 32 + __j];\
if (apic) {\
code;\
}\
}\
}\
}\
}\
}
static void apic_bus_deliver(const 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:
/* XXX: search for focus processor, arbitration */
{
int i, d;
d = -1;
for(i = 0; i < MAX_APIC_WORDS; i++) {
if (deliver_bitmask[i]) {
d = i * 32 + ffs_bit(deliver_bitmask[i]);
break;
}
}
if (d >= 0) {
apic_iter = local_apics[d];
if (apic_iter) {
apic_set_irq(apic_iter, vector_num, trigger_mode);
}
}
}
return;
case APIC_DM_FIXED:
break;
case APIC_DM_SMI:
foreach_apic(apic_iter, deliver_bitmask,
cpu_interrupt(apic_iter->cpu_env, CPU_INTERRUPT_SMI) );
return;
case APIC_DM_NMI:
foreach_apic(apic_iter, deliver_bitmask,
cpu_interrupt(apic_iter->cpu_env, CPU_INTERRUPT_NMI) );
return;
case APIC_DM_INIT:
/* normal INIT IPI sent to processors */
foreach_apic(apic_iter, deliver_bitmask,
apic_init_ipi(apic_iter) );
return;
case APIC_DM_EXTINT:
/* handled in I/O APIC code */
break;
default:
return;
}
foreach_apic(apic_iter, deliver_bitmask,
apic_set_irq(apic_iter, vector_num, trigger_mode) );
}
void apic_deliver_irq(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[MAX_APIC_WORDS];
apic_get_delivery_bitmask(deliver_bitmask, dest, dest_mode);
apic_bus_deliver(deliver_bitmask, delivery_mode, vector_num, polarity,
trigger_mode);
}
void cpu_set_apic_base(CPUState *env, uint64_t val)
{
APICState *s = env->apic_state;
#ifdef DEBUG_APIC
printf("cpu_set_apic_base: %016" PRIx64 "\n", val);
#endif
s->apicbase = (val & 0xfffff000) |
(s->apicbase & (MSR_IA32_APICBASE_BSP | MSR_IA32_APICBASE_ENABLE));
/* if disabled, cannot be enabled again */
if (!(val & MSR_IA32_APICBASE_ENABLE)) {
s->apicbase &= ~MSR_IA32_APICBASE_ENABLE;
env->cpuid_features &= ~CPUID_APIC;
s->spurious_vec &= ~APIC_SV_ENABLE;
}
}
uint64_t cpu_get_apic_base(CPUState *env)
{
APICState *s = env->apic_state;
#ifdef DEBUG_APIC
printf("cpu_get_apic_base: %016" PRIx64 "\n", (uint64_t)s->apicbase);
#endif
return s->apicbase;
}
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)
{
APICState *s = env->apic_state;
return s->tpr >> 4;
}
/* 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;
tpr = (s->tpr >> 4);
isrv = get_highest_priority_int(s->isr);
if (isrv < 0)
isrv = 0;
isrv >>= 4;
if (tpr >= isrv)
ppr = s->tpr;
else
ppr = isrv << 4;
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, ppr;
if (!(s->spurious_vec & APIC_SV_ENABLE))
return;
irrv = get_highest_priority_int(s->irr);
if (irrv < 0)
return;
ppr = apic_get_ppr(s);
if (ppr && (irrv & 0xf0) <= (ppr & 0xf0))
return;
cpu_interrupt(s->cpu_env, CPU_INTERRUPT_HARD);
}
void apic_reset_irq_delivered(void)
{
apic_irq_delivered = 0;
}
int apic_get_irq_delivered(void)
{
return apic_irq_delivered;
}
static void apic_set_irq(APICState *s, int vector_num, int trigger_mode)
{
apic_irq_delivered += !get_bit(s->irr, vector_num);
set_bit(s->irr, vector_num);
if (trigger_mode)
set_bit(s->tmr, vector_num);
else
reset_bit(s->tmr, vector_num);
apic_update_irq(s);
}
static void apic_eoi(APICState *s)
{
int isrv;
isrv = get_highest_priority_int(s->isr);
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 void apic_get_delivery_bitmask(uint32_t *deliver_bitmask,
uint8_t dest, uint8_t dest_mode)
{
APICState *apic_iter;
int i;
if (dest_mode == 0) {
if (dest == 0xff) {
memset(deliver_bitmask, 0xff, MAX_APIC_WORDS * sizeof(uint32_t));
} else {
memset(deliver_bitmask, 0x00, MAX_APIC_WORDS * sizeof(uint32_t));
set_bit(deliver_bitmask, dest);
}
} else {
/* XXX: cluster mode */
memset(deliver_bitmask, 0x00, MAX_APIC_WORDS * sizeof(uint32_t));
for(i = 0; i < MAX_APICS; i++) {
apic_iter = local_apics[i];
if (apic_iter) {
if (apic_iter->dest_mode == 0xf) {
if (dest & apic_iter->log_dest)
set_bit(deliver_bitmask, i);
} else if (apic_iter->dest_mode == 0x0) {
if ((dest & 0xf0) == (apic_iter->log_dest & 0xf0) &&
(dest & apic_iter->log_dest & 0x0f)) {
set_bit(deliver_bitmask, i);
}
}
}
}
}
}
static void apic_init_ipi(APICState *s)
{
int i;
s->tpr = 0;
s->spurious_vec = 0xff;
s->log_dest = 0;
s->dest_mode = 0xf;
memset(s->isr, 0, sizeof(s->isr));
memset(s->tmr, 0, sizeof(s->tmr));
memset(s->irr, 0, sizeof(s->irr));
for(i = 0; i < APIC_LVT_NB; i++)
s->lvt[i] = 1 << 16; /* mask 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;
cpu_reset(s->cpu_env);
if (!(s->apicbase & MSR_IA32_APICBASE_BSP))
s->cpu_env->halted = 1;
}
/* send a SIPI message to the CPU to start it */
static void apic_startup(APICState *s, int vector_num)
{
CPUState *env = s->cpu_env;
if (!env->halted)
return;
env->eip = 0;
cpu_x86_load_seg_cache(env, R_CS, vector_num << 8, vector_num << 12,
0xffff, 0);
env->halted = 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[MAX_APIC_WORDS];
int dest_shorthand = (s->icr[0] >> 18) & 3;
APICState *apic_iter;
switch (dest_shorthand) {
case 0:
apic_get_delivery_bitmask(deliver_bitmask, dest, dest_mode);
break;
case 1:
memset(deliver_bitmask, 0x00, sizeof(deliver_bitmask));
set_bit(deliver_bitmask, s->id);
break;
case 2:
memset(deliver_bitmask, 0xff, sizeof(deliver_bitmask));
break;
case 3:
memset(deliver_bitmask, 0xff, sizeof(deliver_bitmask));
reset_bit(deliver_bitmask, s->id);
break;
}
switch (delivery_mode) {
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) {
foreach_apic(apic_iter, deliver_bitmask,
apic_iter->arb_id = apic_iter->id );
return;
}
}
break;
case APIC_DM_SIPI:
foreach_apic(apic_iter, deliver_bitmask,
apic_startup(apic_iter, vector_num) );
return;
}
apic_bus_deliver(deliver_bitmask, delivery_mode, vector_num, polarity,
trigger_mode);
}
int apic_get_interrupt(CPUState *env)
{
APICState *s = env->apic_state;
int intno;
/* if the APIC is installed or enabled, we let the 8259 handle the
IRQs */
if (!s)
return -1;
if (!(s->spurious_vec & APIC_SV_ENABLE))
return -1;
/* XXX: spurious IRQ handling */
intno = get_highest_priority_int(s->irr);
if (intno < 0)
return -1;
if (s->tpr && intno <= s->tpr)
return s->spurious_vec & 0xff;
reset_bit(s->irr, intno);
set_bit(s->isr, intno);
apic_update_irq(s);
return intno;
}
int apic_accept_pic_intr(CPUState *env)
{
APICState *s = env->apic_state;
uint32_t lvt0;
if (!s)
return -1;
lvt0 = s->lvt[APIC_LVT_LINT0];
if ((s->apicbase & MSR_IA32_APICBASE_ENABLE) == 0 ||
(lvt0 & APIC_LVT_MASKED) == 0)
return 1;
return 0;
}
static uint32_t apic_get_current_count(APICState *s)
{
int64_t d;
uint32_t val;
d = (qemu_get_clock(vm_clock) - s->initial_count_load_time) >>
s->count_shift;
if (s->lvt[APIC_LVT_TIMER] & APIC_LVT_TIMER_PERIODIC) {
/* periodic */
val = s->initial_count - (d % ((uint64_t)s->initial_count + 1));
} else {
if (d >= s->initial_count)
val = 0;
else
val = s->initial_count - d;
}
return val;
}
static void apic_timer_update(APICState *s, int64_t current_time)
{
int64_t next_time, d;
if (!(s->lvt[APIC_LVT_TIMER] & APIC_LVT_MASKED)) {
d = (current_time - s->initial_count_load_time) >>
s->count_shift;
if (s->lvt[APIC_LVT_TIMER] & APIC_LVT_TIMER_PERIODIC) {
if (!s->initial_count)
goto no_timer;
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 = (uint64_t)s->initial_count + 1;
}
next_time = s->initial_count_load_time + (d << s->count_shift);
qemu_mod_timer(s->timer, next_time);
s->next_time = next_time;
} else {
no_timer:
qemu_del_timer(s->timer);
}
}
static void apic_timer(void *opaque)
{
APICState *s = opaque;
apic_local_deliver(s->cpu_env, APIC_LVT_TIMER);
apic_timer_update(s, s->next_time);
}
static uint32_t apic_mem_readb(void *opaque, target_phys_addr_t addr)
{
return 0;
}
static uint32_t apic_mem_readw(void *opaque, target_phys_addr_t addr)
{
return 0;
}
static void apic_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
{
}
static void apic_mem_writew(void *opaque, target_phys_addr_t addr, uint32_t val)
{
}
static uint32_t apic_mem_readl(void *opaque, target_phys_addr_t addr)
{
CPUState *env;
APICState *s;
uint32_t val;
int index;
env = cpu_single_env;
if (!env)
return 0;
s = env->apic_state;
index = (addr >> 4) & 0xff;
switch(index) {
case 0x02: /* id */
val = s->id << 24;
break;
case 0x03: /* version */
val = 0x11 | ((APIC_LVT_NB - 1) << 16); /* version 0x11 */
break;
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 0x0b:
val = 0;
break;
case 0x0d:
val = s->log_dest << 24;
break;
case 0x0e:
val = s->dest_mode << 28;
break;
case 0x0f:
val = s->spurious_vec;
break;
case 0x10 ... 0x17:
val = s->isr[index & 7];
break;
case 0x18 ... 0x1f:
val = s->tmr[index & 7];
break;
case 0x20 ... 0x27:
val = s->irr[index & 7];
break;
case 0x28:
val = s->esr;
break;
case 0x30:
case 0x31:
val = s->icr[index & 1];
break;
case 0x32 ... 0x37:
val = s->lvt[index - 0x32];
break;
case 0x38:
val = s->initial_count;
break;
case 0x39:
val = apic_get_current_count(s);
break;
case 0x3e:
val = s->divide_conf;
break;
default:
s->esr |= ESR_ILLEGAL_ADDRESS;
val = 0;
break;
}
#ifdef DEBUG_APIC
printf("APIC read: %08x = %08x\n", (uint32_t)addr, val);
#endif
return val;
}
static void apic_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
{
CPUState *env;
APICState *s;
int index;
env = cpu_single_env;
if (!env)
return;
s = env->apic_state;
#ifdef DEBUG_APIC
printf("APIC write: %08x = %08x\n", (uint32_t)addr, val);
#endif
index = (addr >> 4) & 0xff;
switch(index) {
case 0x02:
s->id = (val >> 24);
break;
case 0x03:
break;
case 0x08:
s->tpr = val;
apic_update_irq(s);
break;
case 0x09:
case 0x0a:
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 0x10 ... 0x17:
case 0x18 ... 0x1f:
case 0x20 ... 0x27:
case 0x28:
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[1] = val;
break;
case 0x32 ... 0x37:
{
int n = index - 0x32;
s->lvt[n] = val;
if (n == APIC_LVT_TIMER)
apic_timer_update(s, qemu_get_clock(vm_clock));
}
break;
case 0x38:
s->initial_count = val;
s->initial_count_load_time = qemu_get_clock(vm_clock);
apic_timer_update(s, s->initial_count_load_time);
break;
case 0x39:
break;
case 0x3e:
{
int v;
s->divide_conf = val & 0xb;
v = (s->divide_conf & 3) | ((s->divide_conf >> 1) & 4);
s->count_shift = (v + 1) & 7;
}
break;
default:
s->esr |= ESR_ILLEGAL_ADDRESS;
break;
}
}
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_be32(f, s->count_shift);
qemu_put_be32s(f, &s->initial_count);
qemu_put_be64(f, s->initial_count_load_time);
qemu_put_be64(f, s->next_time);
qemu_put_timer(f, s->timer);
}
static int apic_load(QEMUFile *f, void *opaque, int version_id)
{
APICState *s = opaque;
int i;
if (version_id > 2)
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);
s->count_shift=qemu_get_be32(f);
qemu_get_be32s(f, &s->initial_count);
s->initial_count_load_time=qemu_get_be64(f);
s->next_time=qemu_get_be64(f);
if (version_id >= 2)
qemu_get_timer(f, s->timer);
return 0;
}
static void apic_reset(void *opaque)
{
APICState *s = opaque;
s->apicbase = 0xfee00000 |
(s->id ? 0 : MSR_IA32_APICBASE_BSP) | MSR_IA32_APICBASE_ENABLE;
apic_init_ipi(s);
if (s->id == 0) {
/*
* LINT0 delivery mode on CPU #0 is set to ExtInt at initialization
* time typically by BIOS, so PIC interrupt can be delivered to the
* processor when local APIC is enabled.
*/
s->lvt[APIC_LVT_LINT0] = 0x700;
}
}
static CPUReadMemoryFunc *apic_mem_read[3] = {
apic_mem_readb,
apic_mem_readw,
apic_mem_readl,
};
static CPUWriteMemoryFunc *apic_mem_write[3] = {
apic_mem_writeb,
apic_mem_writew,
apic_mem_writel,
};
int apic_init(CPUState *env)
{
APICState *s;
if (last_apic_id >= MAX_APICS)
return -1;
s = qemu_mallocz(sizeof(APICState));
env->apic_state = s;
s->id = last_apic_id++;
env->cpuid_apic_id = s->id;
s->cpu_env = env;
apic_reset(s);
/* 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);
}
s->timer = qemu_new_timer(vm_clock, apic_timer, s);
register_savevm("apic", s->id, 2, apic_save, apic_load, s);
qemu_register_reset(apic_reset, s);
local_apics[s->id] = s;
return 0;
}
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