4 * Copyright (c) 2004-2005 Fabrice Bellard
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA
22 #include "qemu-timer.h"
23 #include "host-utils.h"
27 /* APIC Local Vector Table */
28 #define APIC_LVT_TIMER 0
29 #define APIC_LVT_THERMAL 1
30 #define APIC_LVT_PERFORM 2
31 #define APIC_LVT_LINT0 3
32 #define APIC_LVT_LINT1 4
33 #define APIC_LVT_ERROR 5
36 /* APIC delivery modes */
37 #define APIC_DM_FIXED 0
38 #define APIC_DM_LOWPRI 1
41 #define APIC_DM_INIT 5
42 #define APIC_DM_SIPI 6
43 #define APIC_DM_EXTINT 7
45 /* APIC destination mode */
46 #define APIC_DESTMODE_FLAT 0xf
47 #define APIC_DESTMODE_CLUSTER 1
49 #define APIC_TRIGGER_EDGE 0
50 #define APIC_TRIGGER_LEVEL 1
52 #define APIC_LVT_TIMER_PERIODIC (1<<17)
53 #define APIC_LVT_MASKED (1<<16)
54 #define APIC_LVT_LEVEL_TRIGGER (1<<15)
55 #define APIC_LVT_REMOTE_IRR (1<<14)
56 #define APIC_INPUT_POLARITY (1<<13)
57 #define APIC_SEND_PENDING (1<<12)
59 #define ESR_ILLEGAL_ADDRESS (1 << 7)
61 #define APIC_SV_ENABLE (1 << 8)
64 #define MAX_APIC_WORDS 8
66 typedef struct APICState {
72 uint32_t spurious_vec;
75 uint32_t isr[8]; /* in service register */
76 uint32_t tmr[8]; /* trigger mode register */
77 uint32_t irr[8]; /* interrupt request register */
78 uint32_t lvt[APIC_LVT_NB];
79 uint32_t esr; /* error register */
84 uint32_t initial_count;
85 int64_t initial_count_load_time, next_time;
89 static int apic_io_memory;
90 static APICState *local_apics[MAX_APICS + 1];
91 static int last_apic_id = 0;
92 static int apic_irq_delivered;
95 static void apic_init_ipi(APICState *s);
96 static void apic_set_irq(APICState *s, int vector_num, int trigger_mode);
97 static void apic_update_irq(APICState *s);
98 static void apic_get_delivery_bitmask(uint32_t *deliver_bitmask,
99 uint8_t dest, uint8_t dest_mode);
101 /* Find first bit starting from msb */
102 static int fls_bit(uint32_t value)
104 return 31 - clz32(value);
107 /* Find first bit starting from lsb */
108 static int ffs_bit(uint32_t value)
113 static inline void set_bit(uint32_t *tab, int index)
117 mask = 1 << (index & 0x1f);
121 static inline void reset_bit(uint32_t *tab, int index)
125 mask = 1 << (index & 0x1f);
129 static inline int get_bit(uint32_t *tab, int index)
133 mask = 1 << (index & 0x1f);
134 return !!(tab[i] & mask);
137 static void apic_local_deliver(CPUState *env, int vector)
139 APICState *s = env->apic_state;
140 uint32_t lvt = s->lvt[vector];
143 if (lvt & APIC_LVT_MASKED)
146 switch ((lvt >> 8) & 7) {
148 cpu_interrupt(env, CPU_INTERRUPT_SMI);
152 cpu_interrupt(env, CPU_INTERRUPT_NMI);
156 cpu_interrupt(env, CPU_INTERRUPT_HARD);
160 trigger_mode = APIC_TRIGGER_EDGE;
161 if ((vector == APIC_LVT_LINT0 || vector == APIC_LVT_LINT1) &&
162 (lvt & APIC_LVT_LEVEL_TRIGGER))
163 trigger_mode = APIC_TRIGGER_LEVEL;
164 apic_set_irq(s, lvt & 0xff, trigger_mode);
168 void apic_deliver_pic_intr(CPUState *env, int level)
171 apic_local_deliver(env, APIC_LVT_LINT0);
173 APICState *s = env->apic_state;
174 uint32_t lvt = s->lvt[APIC_LVT_LINT0];
176 switch ((lvt >> 8) & 7) {
178 if (!(lvt & APIC_LVT_LEVEL_TRIGGER))
180 reset_bit(s->irr, lvt & 0xff);
183 cpu_reset_interrupt(env, CPU_INTERRUPT_HARD);
189 #define foreach_apic(apic, deliver_bitmask, code) \
191 int __i, __j, __mask;\
192 for(__i = 0; __i < MAX_APIC_WORDS; __i++) {\
193 __mask = deliver_bitmask[__i];\
195 for(__j = 0; __j < 32; __j++) {\
196 if (__mask & (1 << __j)) {\
197 apic = local_apics[__i * 32 + __j];\
207 static void apic_bus_deliver(const uint32_t *deliver_bitmask,
208 uint8_t delivery_mode,
209 uint8_t vector_num, uint8_t polarity,
210 uint8_t trigger_mode)
212 APICState *apic_iter;
214 switch (delivery_mode) {
216 /* XXX: search for focus processor, arbitration */
220 for(i = 0; i < MAX_APIC_WORDS; i++) {
221 if (deliver_bitmask[i]) {
222 d = i * 32 + ffs_bit(deliver_bitmask[i]);
227 apic_iter = local_apics[d];
229 apic_set_irq(apic_iter, vector_num, trigger_mode);
239 foreach_apic(apic_iter, deliver_bitmask,
240 cpu_interrupt(apic_iter->cpu_env, CPU_INTERRUPT_SMI) );
244 foreach_apic(apic_iter, deliver_bitmask,
245 cpu_interrupt(apic_iter->cpu_env, CPU_INTERRUPT_NMI) );
249 /* normal INIT IPI sent to processors */
250 foreach_apic(apic_iter, deliver_bitmask,
251 apic_init_ipi(apic_iter) );
255 /* handled in I/O APIC code */
262 foreach_apic(apic_iter, deliver_bitmask,
263 apic_set_irq(apic_iter, vector_num, trigger_mode) );
266 void apic_deliver_irq(uint8_t dest, uint8_t dest_mode,
267 uint8_t delivery_mode, uint8_t vector_num,
268 uint8_t polarity, uint8_t trigger_mode)
270 uint32_t deliver_bitmask[MAX_APIC_WORDS];
272 apic_get_delivery_bitmask(deliver_bitmask, dest, dest_mode);
273 apic_bus_deliver(deliver_bitmask, delivery_mode, vector_num, polarity,
277 void cpu_set_apic_base(CPUState *env, uint64_t val)
279 APICState *s = env->apic_state;
281 printf("cpu_set_apic_base: %016" PRIx64 "\n", val);
285 s->apicbase = (val & 0xfffff000) |
286 (s->apicbase & (MSR_IA32_APICBASE_BSP | MSR_IA32_APICBASE_ENABLE));
287 /* if disabled, cannot be enabled again */
288 if (!(val & MSR_IA32_APICBASE_ENABLE)) {
289 s->apicbase &= ~MSR_IA32_APICBASE_ENABLE;
290 env->cpuid_features &= ~CPUID_APIC;
291 s->spurious_vec &= ~APIC_SV_ENABLE;
295 uint64_t cpu_get_apic_base(CPUState *env)
297 APICState *s = env->apic_state;
299 printf("cpu_get_apic_base: %016" PRIx64 "\n",
300 s ? (uint64_t)s->apicbase: 0);
302 return s ? s->apicbase : 0;
305 void cpu_set_apic_tpr(CPUX86State *env, uint8_t val)
307 APICState *s = env->apic_state;
310 s->tpr = (val & 0x0f) << 4;
314 uint8_t cpu_get_apic_tpr(CPUX86State *env)
316 APICState *s = env->apic_state;
317 return s ? s->tpr >> 4 : 0;
320 /* return -1 if no bit is set */
321 static int get_highest_priority_int(uint32_t *tab)
324 for(i = 7; i >= 0; i--) {
326 return i * 32 + fls_bit(tab[i]);
332 static int apic_get_ppr(APICState *s)
337 isrv = get_highest_priority_int(s->isr);
348 static int apic_get_arb_pri(APICState *s)
350 /* XXX: arbitration */
354 /* signal the CPU if an irq is pending */
355 static void apic_update_irq(APICState *s)
358 if (!(s->spurious_vec & APIC_SV_ENABLE))
360 irrv = get_highest_priority_int(s->irr);
363 ppr = apic_get_ppr(s);
364 if (ppr && (irrv & 0xf0) <= (ppr & 0xf0))
366 cpu_interrupt(s->cpu_env, CPU_INTERRUPT_HARD);
369 void apic_reset_irq_delivered(void)
371 apic_irq_delivered = 0;
374 int apic_get_irq_delivered(void)
376 return apic_irq_delivered;
379 static void apic_set_irq(APICState *s, int vector_num, int trigger_mode)
381 apic_irq_delivered += !get_bit(s->irr, vector_num);
383 set_bit(s->irr, vector_num);
385 set_bit(s->tmr, vector_num);
387 reset_bit(s->tmr, vector_num);
391 static void apic_eoi(APICState *s)
394 isrv = get_highest_priority_int(s->isr);
397 reset_bit(s->isr, isrv);
398 /* XXX: send the EOI packet to the APIC bus to allow the I/O APIC to
399 set the remote IRR bit for level triggered interrupts. */
403 static void apic_get_delivery_bitmask(uint32_t *deliver_bitmask,
404 uint8_t dest, uint8_t dest_mode)
406 APICState *apic_iter;
409 if (dest_mode == 0) {
411 memset(deliver_bitmask, 0xff, MAX_APIC_WORDS * sizeof(uint32_t));
413 memset(deliver_bitmask, 0x00, MAX_APIC_WORDS * sizeof(uint32_t));
414 set_bit(deliver_bitmask, dest);
417 /* XXX: cluster mode */
418 memset(deliver_bitmask, 0x00, MAX_APIC_WORDS * sizeof(uint32_t));
419 for(i = 0; i < MAX_APICS; i++) {
420 apic_iter = local_apics[i];
422 if (apic_iter->dest_mode == 0xf) {
423 if (dest & apic_iter->log_dest)
424 set_bit(deliver_bitmask, i);
425 } else if (apic_iter->dest_mode == 0x0) {
426 if ((dest & 0xf0) == (apic_iter->log_dest & 0xf0) &&
427 (dest & apic_iter->log_dest & 0x0f)) {
428 set_bit(deliver_bitmask, i);
437 static void apic_init_ipi(APICState *s)
442 s->spurious_vec = 0xff;
445 memset(s->isr, 0, sizeof(s->isr));
446 memset(s->tmr, 0, sizeof(s->tmr));
447 memset(s->irr, 0, sizeof(s->irr));
448 for(i = 0; i < APIC_LVT_NB; i++)
449 s->lvt[i] = 1 << 16; /* mask LVT */
451 memset(s->icr, 0, sizeof(s->icr));
454 s->initial_count = 0;
455 s->initial_count_load_time = 0;
458 cpu_reset(s->cpu_env);
460 if (!(s->apicbase & MSR_IA32_APICBASE_BSP))
461 s->cpu_env->halted = 1;
464 /* send a SIPI message to the CPU to start it */
465 static void apic_startup(APICState *s, int vector_num)
467 CPUState *env = s->cpu_env;
471 cpu_x86_load_seg_cache(env, R_CS, vector_num << 8, vector_num << 12,
476 static void apic_deliver(APICState *s, uint8_t dest, uint8_t dest_mode,
477 uint8_t delivery_mode, uint8_t vector_num,
478 uint8_t polarity, uint8_t trigger_mode)
480 uint32_t deliver_bitmask[MAX_APIC_WORDS];
481 int dest_shorthand = (s->icr[0] >> 18) & 3;
482 APICState *apic_iter;
484 switch (dest_shorthand) {
486 apic_get_delivery_bitmask(deliver_bitmask, dest, dest_mode);
489 memset(deliver_bitmask, 0x00, sizeof(deliver_bitmask));
490 set_bit(deliver_bitmask, s->id);
493 memset(deliver_bitmask, 0xff, sizeof(deliver_bitmask));
496 memset(deliver_bitmask, 0xff, sizeof(deliver_bitmask));
497 reset_bit(deliver_bitmask, s->id);
501 switch (delivery_mode) {
504 int trig_mode = (s->icr[0] >> 15) & 1;
505 int level = (s->icr[0] >> 14) & 1;
506 if (level == 0 && trig_mode == 1) {
507 foreach_apic(apic_iter, deliver_bitmask,
508 apic_iter->arb_id = apic_iter->id );
515 foreach_apic(apic_iter, deliver_bitmask,
516 apic_startup(apic_iter, vector_num) );
520 apic_bus_deliver(deliver_bitmask, delivery_mode, vector_num, polarity,
524 int apic_get_interrupt(CPUState *env)
526 APICState *s = env->apic_state;
529 /* if the APIC is installed or enabled, we let the 8259 handle the
533 if (!(s->spurious_vec & APIC_SV_ENABLE))
536 /* XXX: spurious IRQ handling */
537 intno = get_highest_priority_int(s->irr);
540 if (s->tpr && intno <= s->tpr)
541 return s->spurious_vec & 0xff;
542 reset_bit(s->irr, intno);
543 set_bit(s->isr, intno);
548 int apic_accept_pic_intr(CPUState *env)
550 APICState *s = env->apic_state;
556 lvt0 = s->lvt[APIC_LVT_LINT0];
558 if ((s->apicbase & MSR_IA32_APICBASE_ENABLE) == 0 ||
559 (lvt0 & APIC_LVT_MASKED) == 0)
565 static uint32_t apic_get_current_count(APICState *s)
569 d = (qemu_get_clock(vm_clock) - s->initial_count_load_time) >>
571 if (s->lvt[APIC_LVT_TIMER] & APIC_LVT_TIMER_PERIODIC) {
573 val = s->initial_count - (d % ((uint64_t)s->initial_count + 1));
575 if (d >= s->initial_count)
578 val = s->initial_count - d;
583 static void apic_timer_update(APICState *s, int64_t current_time)
585 int64_t next_time, d;
587 if (!(s->lvt[APIC_LVT_TIMER] & APIC_LVT_MASKED)) {
588 d = (current_time - s->initial_count_load_time) >>
590 if (s->lvt[APIC_LVT_TIMER] & APIC_LVT_TIMER_PERIODIC) {
591 if (!s->initial_count)
593 d = ((d / ((uint64_t)s->initial_count + 1)) + 1) * ((uint64_t)s->initial_count + 1);
595 if (d >= s->initial_count)
597 d = (uint64_t)s->initial_count + 1;
599 next_time = s->initial_count_load_time + (d << s->count_shift);
600 qemu_mod_timer(s->timer, next_time);
601 s->next_time = next_time;
604 qemu_del_timer(s->timer);
608 static void apic_timer(void *opaque)
610 APICState *s = opaque;
612 apic_local_deliver(s->cpu_env, APIC_LVT_TIMER);
613 apic_timer_update(s, s->next_time);
616 static uint32_t apic_mem_readb(void *opaque, target_phys_addr_t addr)
621 static uint32_t apic_mem_readw(void *opaque, target_phys_addr_t addr)
626 static void apic_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
630 static void apic_mem_writew(void *opaque, target_phys_addr_t addr, uint32_t val)
634 static uint32_t apic_mem_readl(void *opaque, target_phys_addr_t addr)
641 env = cpu_single_env;
646 index = (addr >> 4) & 0xff;
651 case 0x03: /* version */
652 val = 0x11 | ((APIC_LVT_NB - 1) << 16); /* version 0x11 */
658 val = apic_get_arb_pri(s);
662 val = apic_get_ppr(s);
668 val = s->log_dest << 24;
671 val = s->dest_mode << 28;
674 val = s->spurious_vec;
677 val = s->isr[index & 7];
680 val = s->tmr[index & 7];
683 val = s->irr[index & 7];
690 val = s->icr[index & 1];
693 val = s->lvt[index - 0x32];
696 val = s->initial_count;
699 val = apic_get_current_count(s);
702 val = s->divide_conf;
705 s->esr |= ESR_ILLEGAL_ADDRESS;
710 printf("APIC read: %08x = %08x\n", (uint32_t)addr, val);
715 static void apic_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
721 env = cpu_single_env;
727 printf("APIC write: %08x = %08x\n", (uint32_t)addr, val);
730 index = (addr >> 4) & 0xff;
748 s->log_dest = val >> 24;
751 s->dest_mode = val >> 28;
754 s->spurious_vec = val & 0x1ff;
764 apic_deliver(s, (s->icr[1] >> 24) & 0xff, (s->icr[0] >> 11) & 1,
765 (s->icr[0] >> 8) & 7, (s->icr[0] & 0xff),
766 (s->icr[0] >> 14) & 1, (s->icr[0] >> 15) & 1);
773 int n = index - 0x32;
775 if (n == APIC_LVT_TIMER)
776 apic_timer_update(s, qemu_get_clock(vm_clock));
780 s->initial_count = val;
781 s->initial_count_load_time = qemu_get_clock(vm_clock);
782 apic_timer_update(s, s->initial_count_load_time);
789 s->divide_conf = val & 0xb;
790 v = (s->divide_conf & 3) | ((s->divide_conf >> 1) & 4);
791 s->count_shift = (v + 1) & 7;
795 s->esr |= ESR_ILLEGAL_ADDRESS;
800 static void apic_save(QEMUFile *f, void *opaque)
802 APICState *s = opaque;
805 qemu_put_be32s(f, &s->apicbase);
806 qemu_put_8s(f, &s->id);
807 qemu_put_8s(f, &s->arb_id);
808 qemu_put_8s(f, &s->tpr);
809 qemu_put_be32s(f, &s->spurious_vec);
810 qemu_put_8s(f, &s->log_dest);
811 qemu_put_8s(f, &s->dest_mode);
812 for (i = 0; i < 8; i++) {
813 qemu_put_be32s(f, &s->isr[i]);
814 qemu_put_be32s(f, &s->tmr[i]);
815 qemu_put_be32s(f, &s->irr[i]);
817 for (i = 0; i < APIC_LVT_NB; i++) {
818 qemu_put_be32s(f, &s->lvt[i]);
820 qemu_put_be32s(f, &s->esr);
821 qemu_put_be32s(f, &s->icr[0]);
822 qemu_put_be32s(f, &s->icr[1]);
823 qemu_put_be32s(f, &s->divide_conf);
824 qemu_put_be32(f, s->count_shift);
825 qemu_put_be32s(f, &s->initial_count);
826 qemu_put_be64(f, s->initial_count_load_time);
827 qemu_put_be64(f, s->next_time);
829 qemu_put_timer(f, s->timer);
832 static int apic_load(QEMUFile *f, void *opaque, int version_id)
834 APICState *s = opaque;
840 /* XXX: what if the base changes? (registered memory regions) */
841 qemu_get_be32s(f, &s->apicbase);
842 qemu_get_8s(f, &s->id);
843 qemu_get_8s(f, &s->arb_id);
844 qemu_get_8s(f, &s->tpr);
845 qemu_get_be32s(f, &s->spurious_vec);
846 qemu_get_8s(f, &s->log_dest);
847 qemu_get_8s(f, &s->dest_mode);
848 for (i = 0; i < 8; i++) {
849 qemu_get_be32s(f, &s->isr[i]);
850 qemu_get_be32s(f, &s->tmr[i]);
851 qemu_get_be32s(f, &s->irr[i]);
853 for (i = 0; i < APIC_LVT_NB; i++) {
854 qemu_get_be32s(f, &s->lvt[i]);
856 qemu_get_be32s(f, &s->esr);
857 qemu_get_be32s(f, &s->icr[0]);
858 qemu_get_be32s(f, &s->icr[1]);
859 qemu_get_be32s(f, &s->divide_conf);
860 s->count_shift=qemu_get_be32(f);
861 qemu_get_be32s(f, &s->initial_count);
862 s->initial_count_load_time=qemu_get_be64(f);
863 s->next_time=qemu_get_be64(f);
866 qemu_get_timer(f, s->timer);
870 static void apic_reset(void *opaque)
872 APICState *s = opaque;
874 s->apicbase = 0xfee00000 |
875 (s->id ? 0 : MSR_IA32_APICBASE_BSP) | MSR_IA32_APICBASE_ENABLE;
881 * LINT0 delivery mode on CPU #0 is set to ExtInt at initialization
882 * time typically by BIOS, so PIC interrupt can be delivered to the
883 * processor when local APIC is enabled.
885 s->lvt[APIC_LVT_LINT0] = 0x700;
889 static CPUReadMemoryFunc *apic_mem_read[3] = {
895 static CPUWriteMemoryFunc *apic_mem_write[3] = {
901 int apic_init(CPUState *env)
905 if (last_apic_id >= MAX_APICS)
907 s = qemu_mallocz(sizeof(APICState));
909 s->id = last_apic_id++;
910 env->cpuid_apic_id = s->id;
915 /* XXX: mapping more APICs at the same memory location */
916 if (apic_io_memory == 0) {
917 /* NOTE: the APIC is directly connected to the CPU - it is not
918 on the global memory bus. */
919 apic_io_memory = cpu_register_io_memory(0, apic_mem_read,
920 apic_mem_write, NULL);
921 cpu_register_physical_memory(s->apicbase & ~0xfff, 0x1000,
924 s->timer = qemu_new_timer(vm_clock, apic_timer, s);
926 register_savevm("apic", s->id, 2, apic_save, apic_load, s);
927 qemu_register_reset(apic_reset, 0, s);
929 local_apics[s->id] = s;