2 * This file is part of the Palacios Virtual Machine Monitor developed
3 * by the V3VEE Project with funding from the United States National
4 * Science Foundation and the Department of Energy.
6 * The V3VEE Project is a joint project between Northwestern University
7 * and the University of New Mexico. You can find out more at
10 * Copyright (c) 2008, Jack Lange <jarusl@cs.northwestern.edu>
11 * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org>
12 * All rights reserved.
14 * Author: Jack Lange <jarusl@cs.northwestern.edu>
16 * This is free software. You are permitted to use,
17 * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
21 #include <devices/apic.h>
22 #include <devices/apic_regs.h>
23 #include <palacios/vmm.h>
24 #include <palacios/vmm_msr.h>
29 #define PrintDebug(fmt, args...)
33 typedef enum { APIC_TMR_INT, APIC_THERM_INT, APIC_PERF_INT,
34 APIC_LINT0_INT, APIC_LINT1_INT, APIC_ERR_INT } apic_irq_type_t;
36 #define APIC_FIXED_DELIVERY 0x0
37 #define APIC_SMI_DELIVERY 0x2
38 #define APIC_NMI_DELIVERY 0x4
39 #define APIC_INIT_DELIVERY 0x5
40 #define APIC_EXTINT_DELIVERY 0x7
43 #define BASE_ADDR_MSR 0x0000001B
44 #define DEFAULT_BASE_ADDR 0xfee00000
46 #define APIC_ID_OFFSET 0x020
47 #define APIC_VERSION_OFFSET 0x030
48 #define TPR_OFFSET 0x080
49 #define APR_OFFSET 0x090
50 #define PPR_OFFSET 0x0a0
51 #define EOI_OFFSET 0x0b0
52 #define REMOTE_READ_OFFSET 0x0c0
53 #define LDR_OFFSET 0x0d0
54 #define DFR_OFFSET 0x0e0
55 #define SPURIOUS_INT_VEC_OFFSET 0x0f0
57 #define ISR_OFFSET0 0x100 // 0x100 - 0x170
58 #define ISR_OFFSET1 0x110 // 0x100 - 0x170
59 #define ISR_OFFSET2 0x120 // 0x100 - 0x170
60 #define ISR_OFFSET3 0x130 // 0x100 - 0x170
61 #define ISR_OFFSET4 0x140 // 0x100 - 0x170
62 #define ISR_OFFSET5 0x150 // 0x100 - 0x170
63 #define ISR_OFFSET6 0x160 // 0x100 - 0x170
64 #define ISR_OFFSET7 0x170 // 0x100 - 0x170
66 #define TRIG_OFFSET0 0x180 // 0x180 - 0x1f0
67 #define TRIG_OFFSET1 0x190 // 0x180 - 0x1f0
68 #define TRIG_OFFSET2 0x1a0 // 0x180 - 0x1f0
69 #define TRIG_OFFSET3 0x1b0 // 0x180 - 0x1f0
70 #define TRIG_OFFSET4 0x1c0 // 0x180 - 0x1f0
71 #define TRIG_OFFSET5 0x1d0 // 0x180 - 0x1f0
72 #define TRIG_OFFSET6 0x1e0 // 0x180 - 0x1f0
73 #define TRIG_OFFSET7 0x1f0 // 0x180 - 0x1f0
76 #define IRR_OFFSET0 0x200 // 0x200 - 0x270
77 #define IRR_OFFSET1 0x210 // 0x200 - 0x270
78 #define IRR_OFFSET2 0x220 // 0x200 - 0x270
79 #define IRR_OFFSET3 0x230 // 0x200 - 0x270
80 #define IRR_OFFSET4 0x240 // 0x200 - 0x270
81 #define IRR_OFFSET5 0x250 // 0x200 - 0x270
82 #define IRR_OFFSET6 0x260 // 0x200 - 0x270
83 #define IRR_OFFSET7 0x270 // 0x200 - 0x270
86 #define ESR_OFFSET 0x280
87 #define INT_CMD_LO_OFFSET 0x300
88 #define INT_CMD_HI_OFFSET 0x310
89 #define TMR_LOC_VEC_TBL_OFFSET 0x320
90 #define THERM_LOC_VEC_TBL_OFFSET 0x330
91 #define PERF_CTR_LOC_VEC_TBL_OFFSET 0x340
92 #define LINT0_VEC_TBL_OFFSET 0x350
93 #define LINT1_VEC_TBL_OFFSET 0x360
94 #define ERR_VEC_TBL_OFFSET 0x370
95 #define TMR_INIT_CNT_OFFSET 0x380
96 #define TMR_CUR_CNT_OFFSET 0x390
97 #define TMR_DIV_CFG_OFFSET 0x3e0
98 #define EXT_APIC_FEATURE_OFFSET 0x400
99 #define EXT_APIC_CMD_OFFSET 0x410
100 #define SEOI_OFFSET 0x420
102 #define IER_OFFSET0 0x480 // 0x480 - 0x4f0
103 #define IER_OFFSET1 0x490 // 0x480 - 0x4f0
104 #define IER_OFFSET2 0x4a0 // 0x480 - 0x4f0
105 #define IER_OFFSET3 0x4b0 // 0x480 - 0x4f0
106 #define IER_OFFSET4 0x4c0 // 0x480 - 0x4f0
107 #define IER_OFFSET5 0x4d0 // 0x480 - 0x4f0
108 #define IER_OFFSET6 0x4e0 // 0x480 - 0x4f0
109 #define IER_OFFSET7 0x4f0 // 0x480 - 0x4f0
111 #define EXT_INT_LOC_VEC_TBL_OFFSET0 0x500 // 0x500 - 0x530
112 #define EXT_INT_LOC_VEC_TBL_OFFSET1 0x510 // 0x500 - 0x530
113 #define EXT_INT_LOC_VEC_TBL_OFFSET2 0x520 // 0x500 - 0x530
114 #define EXT_INT_LOC_VEC_TBL_OFFSET3 0x530 // 0x500 - 0x530
123 uint_t bootstrap_cpu : 1;
125 uint_t apic_enable : 1;
126 ullong_t base_addr : 40;
128 } __attribute__((packed));
129 } __attribute__((packed));
130 } __attribute__((packed));
139 v3_msr_t base_addr_msr;
142 /* memory map registers */
144 struct lapic_id_reg lapic_id;
145 struct apic_ver_reg apic_ver;
146 struct ext_apic_ctrl_reg ext_apic_ctrl;
147 struct local_vec_tbl_reg local_vec_tbl;
148 struct tmr_vec_tbl_reg tmr_vec_tbl;
149 struct tmr_div_cfg_reg tmr_div_cfg;
150 struct lint_vec_tbl_reg lint0_vec_tbl;
151 struct lint_vec_tbl_reg lint1_vec_tbl;
152 struct perf_ctr_loc_vec_tbl_reg perf_ctr_loc_vec_tbl;
153 struct therm_loc_vec_tbl_reg therm_loc_vec_tbl;
154 struct err_vec_tbl_reg err_vec_tbl;
155 struct err_status_reg err_status;
156 struct spurious_int_reg spurious_int;
157 struct int_cmd_reg int_cmd;
158 struct log_dst_reg log_dst;
159 struct dst_fmt_reg dst_fmt;
160 struct arb_prio_reg arb_prio;
161 struct task_prio_reg task_prio;
162 struct proc_prio_reg proc_prio;
163 struct ext_apic_feature_reg ext_apic_feature;
164 struct spec_eoi_reg spec_eoi;
167 uint32_t tmr_cur_cnt;
168 uint32_t tmr_init_cnt;
171 struct local_vec_tbl_reg ext_intr_vec_tbl[4];
173 uint32_t rem_rd_data;
176 uchar_t int_req_reg[32];
177 uchar_t int_svc_reg[32];
178 uchar_t int_en_reg[32];
179 uchar_t trig_mode_reg[32];
187 static void init_apic_state(struct apic_state * apic) {
188 apic->base_addr = DEFAULT_BASE_ADDR;
189 apic->base_addr_msr.value = 0x0000000000000900LL;
190 apic->base_addr_msr.value |= ((uint64_t)DEFAULT_BASE_ADDR);
192 PrintDebug("Sizeof Interrupt Request Register %d, should be 32\n",
193 (uint_t)sizeof(apic->int_req_reg));
195 memset(apic->int_req_reg, 0, sizeof(apic->int_req_reg));
196 memset(apic->int_svc_reg, 0, sizeof(apic->int_svc_reg));
197 memset(apic->int_en_reg, 0xff, sizeof(apic->int_en_reg));
198 memset(apic->trig_mode_reg, 0, sizeof(apic->trig_mode_reg));
200 apic->eoi = 0x00000000;
201 apic->rem_rd_data = 0x00000000;
202 apic->tmr_init_cnt = 0x00000000;
203 apic->tmr_cur_cnt = 0x00000000;
206 // We need to figure out what the APIC ID is....
207 apic->lapic_id.val = 0x00000000;
209 // The P6 has 6 LVT entries, so we set the value to (6-1)...
210 apic->apic_ver.val = 0x80050010;
212 apic->task_prio.val = 0x00000000;
213 apic->arb_prio.val = 0x00000000;
214 apic->proc_prio.val = 0x00000000;
215 apic->log_dst.val = 0x00000000;
216 apic->dst_fmt.val = 0xffffffff;
217 apic->spurious_int.val = 0x000000ff;
218 apic->err_status.val = 0x00000000;
219 apic->int_cmd.val = 0x0000000000000000LL;
220 apic->tmr_vec_tbl.val = 0x00010000;
221 apic->therm_loc_vec_tbl.val = 0x00010000;
222 apic->perf_ctr_loc_vec_tbl.val = 0x00010000;
223 apic->lint0_vec_tbl.val = 0x00010000;
224 apic->lint1_vec_tbl.val = 0x00010000;
225 apic->err_vec_tbl.val = 0x00010000;
226 apic->tmr_div_cfg.val = 0x00000000;
227 //apic->ext_apic_feature.val = 0x00000007;
228 apic->ext_apic_feature.val = 0x00040007;
229 apic->ext_apic_ctrl.val = 0x00000000;
230 apic->spec_eoi.val = 0x00000000;
236 static int read_apic_msr(uint_t msr, v3_msr_t * dst, void * priv_data) {
237 struct vm_device * dev = (struct vm_device *)priv_data;
238 struct apic_state * apic = (struct apic_state *)dev->private_data;
239 PrintError("READING APIC BASE ADDR: HI=%x LO=%x\n", apic->base_addr_msr.hi, apic->base_addr_msr.lo);
245 static int write_apic_msr(uint_t msr, v3_msr_t src, void * priv_data) {
246 // struct vm_device * dev = (struct vm_device *)priv_data;
247 // struct apic_state * apic = (struct apic_state *)dev->private_data;
249 PrintError("WRITING APIC BASE ADDR: HI=%x LO=%x\n", src.hi, src.lo);
255 // irq_num is the bit offset into a 256 bit buffer...
256 static int activate_apic_irq(struct apic_state * apic, uint32_t irq_num) {
257 int major_offset = (irq_num & ~0x00000007) >> 3;
258 int minor_offset = irq_num & 0x00000007;
259 uchar_t * req_location = apic->int_req_reg + major_offset;
260 uchar_t * en_location = apic->int_en_reg + major_offset;
261 uchar_t flag = 0x1 << minor_offset;
264 PrintError("Attempting to raise an invalid interrupt: %d\n", irq_num);
268 PrintDebug("Raising APIC IRQ %d\n", irq_num);
270 if (*en_location & flag) {
271 *req_location |= flag;
273 PrintDebug("Interrupt not enabled... %.2x\n", *en_location);
282 static int get_highest_isr(struct apic_state * apic) {
285 // We iterate backwards to find the highest priority
286 for (i = 31; i >= 0; i--) {
287 uchar_t * svc_major = apic->int_svc_reg + i;
289 if ((*svc_major) & 0xff) {
290 for (j = 7; j >= 0; j--) {
291 uchar_t flag = 0x1 << j;
292 if ((*svc_major) & flag) {
293 return ((i * 8) + j);
304 static int get_highest_irr(struct apic_state * apic) {
307 // We iterate backwards to find the highest priority
308 for (i = 31; i >= 0; i--) {
309 uchar_t * req_major = apic->int_req_reg + i;
311 if ((*req_major) & 0xff) {
312 for (j = 7; j >= 0; j--) {
313 uchar_t flag = 0x1 << j;
314 if ((*req_major) & flag) {
315 return ((i * 8) + j);
327 static int apic_do_eoi(struct apic_state * apic) {
328 int isr_irq = get_highest_isr(apic);
331 int major_offset = (isr_irq & ~0x00000007) >> 3;
332 int minor_offset = isr_irq & 0x00000007;
333 uchar_t flag = 0x1 << minor_offset;
334 uchar_t * svc_location = apic->int_svc_reg + major_offset;
336 PrintDebug("Received APIC EOI\n");
338 *svc_location &= ~flag;
342 if ((isr_irq == 238) ||
344 PrintError("Acking IRQ %d\n", isr_irq);
347 if (isr_irq == 238) {
352 PrintError("Spurious EOI...\n");
359 static int activate_internal_irq(struct apic_state * apic, apic_irq_type_t int_type) {
360 uint32_t vec_num = 0;
361 uint32_t del_mode = 0;
367 vec_num = apic->tmr_vec_tbl.vec;
368 del_mode = APIC_FIXED_DELIVERY;
369 masked = apic->tmr_vec_tbl.mask;
372 vec_num = apic->therm_loc_vec_tbl.vec;
373 del_mode = apic->therm_loc_vec_tbl.msg_type;
374 masked = apic->therm_loc_vec_tbl.mask;
377 vec_num = apic->perf_ctr_loc_vec_tbl.vec;
378 del_mode = apic->perf_ctr_loc_vec_tbl.msg_type;
379 masked = apic->perf_ctr_loc_vec_tbl.mask;
382 vec_num = apic->lint0_vec_tbl.vec;
383 del_mode = apic->lint0_vec_tbl.msg_type;
384 masked = apic->lint0_vec_tbl.mask;
387 vec_num = apic->lint1_vec_tbl.vec;
388 del_mode = apic->lint1_vec_tbl.msg_type;
389 masked = apic->lint1_vec_tbl.mask;
392 vec_num = apic->err_vec_tbl.vec;
393 del_mode = APIC_FIXED_DELIVERY;
394 masked = apic->err_vec_tbl.mask;
397 PrintError("Invalid APIC interrupt type\n");
401 // interrupt is masked, don't send
403 PrintDebug("Inerrupt is masked\n");
407 if (del_mode == APIC_FIXED_DELIVERY) {
408 //PrintDebug("Activating internal APIC IRQ %d\n", vec_num);
409 return activate_apic_irq(apic, vec_num);
411 PrintError("Unhandled Delivery Mode\n");
417 static int apic_read(addr_t guest_addr, void * dst, uint_t length, void * priv_data) {
418 struct vm_device * dev = (struct vm_device *)priv_data;
419 struct apic_state * apic = (struct apic_state *)dev->private_data;
420 addr_t reg_addr = guest_addr - apic->base_addr;
421 struct apic_msr * msr = (struct apic_msr *)&(apic->base_addr_msr.value);
425 PrintDebug("Read apic address space (%p)\n",
428 if (msr->apic_enable == 0) {
429 PrintError("Write to APIC address space with disabled APIC\n");
434 /* Because "May not be supported" doesn't matter to Linux developers... */
435 /* if (length != 4) { */
436 /* PrintError("Invalid apic read length (%d)\n", length); */
440 switch (reg_addr & ~0x3) {
442 // Well, only an idiot would read from a architectural write only register
444 // PrintError("Attempting to read from write only register\n");
450 val = apic->lapic_id.val;
452 case APIC_VERSION_OFFSET:
453 val = apic->apic_ver.val;
456 val = apic->task_prio.val;
459 val = apic->arb_prio.val;
462 val = apic->proc_prio.val;
464 case REMOTE_READ_OFFSET:
465 val = apic->rem_rd_data;
468 val = apic->log_dst.val;
471 val = apic->dst_fmt.val;
473 case SPURIOUS_INT_VEC_OFFSET:
474 val = apic->spurious_int.val;
477 val = apic->err_status.val;
479 case TMR_LOC_VEC_TBL_OFFSET:
480 val = apic->tmr_vec_tbl.val;
482 case LINT0_VEC_TBL_OFFSET:
483 val = apic->lint0_vec_tbl.val;
485 case LINT1_VEC_TBL_OFFSET:
486 val = apic->lint1_vec_tbl.val;
488 case ERR_VEC_TBL_OFFSET:
489 val = apic->err_vec_tbl.val;
491 case TMR_INIT_CNT_OFFSET:
492 val = apic->tmr_init_cnt;
494 case TMR_DIV_CFG_OFFSET:
495 val = apic->tmr_div_cfg.val;
499 val = *(uint32_t *)(apic->int_en_reg);
502 val = *(uint32_t *)(apic->int_en_reg + 4);
505 val = *(uint32_t *)(apic->int_en_reg + 8);
508 val = *(uint32_t *)(apic->int_en_reg + 12);
511 val = *(uint32_t *)(apic->int_en_reg + 16);
514 val = *(uint32_t *)(apic->int_en_reg + 20);
517 val = *(uint32_t *)(apic->int_en_reg + 24);
520 val = *(uint32_t *)(apic->int_en_reg + 28);
524 val = *(uint32_t *)(apic->int_svc_reg);
527 val = *(uint32_t *)(apic->int_svc_reg + 4);
530 val = *(uint32_t *)(apic->int_svc_reg + 8);
533 val = *(uint32_t *)(apic->int_svc_reg + 12);
536 val = *(uint32_t *)(apic->int_svc_reg + 16);
539 val = *(uint32_t *)(apic->int_svc_reg + 20);
542 val = *(uint32_t *)(apic->int_svc_reg + 24);
545 val = *(uint32_t *)(apic->int_svc_reg + 28);
549 val = *(uint32_t *)(apic->trig_mode_reg);
552 val = *(uint32_t *)(apic->trig_mode_reg + 4);
555 val = *(uint32_t *)(apic->trig_mode_reg + 8);
558 val = *(uint32_t *)(apic->trig_mode_reg + 12);
561 val = *(uint32_t *)(apic->trig_mode_reg + 16);
564 val = *(uint32_t *)(apic->trig_mode_reg + 20);
567 val = *(uint32_t *)(apic->trig_mode_reg + 24);
570 val = *(uint32_t *)(apic->trig_mode_reg + 28);
574 val = *(uint32_t *)(apic->int_req_reg);
577 val = *(uint32_t *)(apic->int_req_reg + 4);
580 val = *(uint32_t *)(apic->int_req_reg + 8);
583 val = *(uint32_t *)(apic->int_req_reg + 12);
586 val = *(uint32_t *)(apic->int_req_reg + 16);
589 val = *(uint32_t *)(apic->int_req_reg + 20);
592 val = *(uint32_t *)(apic->int_req_reg + 24);
595 val = *(uint32_t *)(apic->int_req_reg + 28);
597 case TMR_CUR_CNT_OFFSET:
598 val = apic->tmr_cur_cnt;
601 // We are not going to implement these....
602 case THERM_LOC_VEC_TBL_OFFSET:
603 val = apic->therm_loc_vec_tbl.val;
605 case PERF_CTR_LOC_VEC_TBL_OFFSET:
606 val = apic->perf_ctr_loc_vec_tbl.val;
612 case INT_CMD_LO_OFFSET:
613 val = apic->int_cmd.lo;
615 case INT_CMD_HI_OFFSET:
616 val = apic->int_cmd.hi;
619 // handle current timer count
621 // Unhandled Registers
622 case EXT_INT_LOC_VEC_TBL_OFFSET0:
623 val = apic->ext_intr_vec_tbl[0].val;
625 case EXT_INT_LOC_VEC_TBL_OFFSET1:
626 val = apic->ext_intr_vec_tbl[1].val;
628 case EXT_INT_LOC_VEC_TBL_OFFSET2:
629 val = apic->ext_intr_vec_tbl[2].val;
631 case EXT_INT_LOC_VEC_TBL_OFFSET3:
632 val = apic->ext_intr_vec_tbl[3].val;
636 case EXT_APIC_FEATURE_OFFSET:
637 case EXT_APIC_CMD_OFFSET:
641 PrintError("Read from Unhandled APIC Register: %x\n", (uint32_t)reg_addr);
647 uint_t byte_addr = reg_addr & 0x3;
648 uint8_t * val_ptr = (uint8_t *)dst;
650 *val_ptr = *(((uint8_t *)&val) + byte_addr);
652 } else if ((length == 2) &&
653 ((reg_addr & 0x3) == 0x3)) {
654 uint_t byte_addr = reg_addr & 0x3;
655 uint16_t * val_ptr = (uint16_t *)dst;
656 *val_ptr = *(((uint16_t *)&val) + byte_addr);
658 } else if (length == 4) {
659 uint32_t * val_ptr = (uint32_t *)dst;
663 PrintError("Invalid apic read length (%d)\n", length);
667 PrintDebug("Read finished (val=%x)\n", *(uint32_t *)dst);
673 static int apic_write(addr_t guest_addr, void * src, uint_t length, void * priv_data) {
674 struct vm_device * dev = (struct vm_device *)priv_data;
675 struct apic_state * apic = (struct apic_state *)dev->private_data;
676 addr_t reg_addr = guest_addr - apic->base_addr;
677 struct apic_msr * msr = (struct apic_msr *)&(apic->base_addr_msr.value);
678 uint32_t op_val = *(uint32_t *)src;
680 PrintDebug("Write to apic address space (%p) (val=%x)\n",
681 (void *)guest_addr, *(uint32_t *)src);
683 if (msr->apic_enable == 0) {
684 PrintError("Write to APIC address space with disabled APIC\n");
690 PrintError("Invalid apic write length (%d)\n", length);
695 case REMOTE_READ_OFFSET:
696 case APIC_VERSION_OFFSET:
723 case EXT_APIC_FEATURE_OFFSET:
725 PrintError("Attempting to write to read only register %p (ignored)\n", (void *)reg_addr);
727 PrintError("Attempting to write to read only register %p (error)\n", (void *)reg_addr);
734 apic->lapic_id.val = op_val;
737 apic->task_prio.val = op_val;
740 apic->log_dst.val = op_val;
743 apic->dst_fmt.val = op_val;
745 case SPURIOUS_INT_VEC_OFFSET:
746 apic->spurious_int.val = op_val;
749 apic->err_status.val = op_val;
751 case TMR_LOC_VEC_TBL_OFFSET:
752 apic->tmr_vec_tbl.val = op_val;
754 case THERM_LOC_VEC_TBL_OFFSET:
755 apic->therm_loc_vec_tbl.val = op_val;
757 case PERF_CTR_LOC_VEC_TBL_OFFSET:
758 apic->perf_ctr_loc_vec_tbl.val = op_val;
760 case LINT0_VEC_TBL_OFFSET:
761 apic->lint0_vec_tbl.val = op_val;
763 case LINT1_VEC_TBL_OFFSET:
764 apic->lint1_vec_tbl.val = op_val;
766 case ERR_VEC_TBL_OFFSET:
767 apic->err_vec_tbl.val = op_val;
769 case TMR_INIT_CNT_OFFSET:
770 apic->tmr_init_cnt = op_val;
771 apic->tmr_cur_cnt = op_val;
773 case TMR_CUR_CNT_OFFSET:
774 apic->tmr_cur_cnt = op_val;
776 case TMR_DIV_CFG_OFFSET:
777 apic->tmr_div_cfg.val = op_val;
781 // Enable mask (256 bits)
783 *(uint32_t *)(apic->int_en_reg) = op_val;
786 *(uint32_t *)(apic->int_en_reg + 4) = op_val;
789 *(uint32_t *)(apic->int_en_reg + 8) = op_val;
792 *(uint32_t *)(apic->int_en_reg + 12) = op_val;
795 *(uint32_t *)(apic->int_en_reg + 16) = op_val;
798 *(uint32_t *)(apic->int_en_reg + 20) = op_val;
801 *(uint32_t *)(apic->int_en_reg + 24) = op_val;
804 *(uint32_t *)(apic->int_en_reg + 28) = op_val;
807 case EXT_INT_LOC_VEC_TBL_OFFSET0:
808 apic->ext_intr_vec_tbl[0].val = op_val;
810 case EXT_INT_LOC_VEC_TBL_OFFSET1:
811 apic->ext_intr_vec_tbl[1].val = op_val;
813 case EXT_INT_LOC_VEC_TBL_OFFSET2:
814 apic->ext_intr_vec_tbl[2].val = op_val;
816 case EXT_INT_LOC_VEC_TBL_OFFSET3:
817 apic->ext_intr_vec_tbl[3].val = op_val;
827 case INT_CMD_LO_OFFSET:
828 case INT_CMD_HI_OFFSET:
829 // Unhandled Registers
831 case EXT_APIC_CMD_OFFSET:
834 PrintError("Write to Unhandled APIC Register: %x\n", (uint32_t)reg_addr);
838 PrintDebug("Write finished\n");
845 /* Interrupt Controller Functions */
847 // returns 1 if an interrupt is pending, 0 otherwise
848 static int apic_intr_pending(void * private_data) {
849 struct vm_device * dev = (struct vm_device *)private_data;
850 struct apic_state * apic = (struct apic_state *)dev->private_data;
851 int req_irq = get_highest_irr(apic);
852 int svc_irq = get_highest_isr(apic);
854 if ((req_irq >= 0) &&
855 (req_irq > svc_irq)) {
862 static int apic_get_intr_number(void * private_data) {
863 struct vm_device * dev = (struct vm_device *)private_data;
864 struct apic_state * apic = (struct apic_state *)dev->private_data;
865 int req_irq = get_highest_irr(apic);
866 int svc_irq = get_highest_isr(apic);
870 } else if (svc_irq < req_irq) {
877 static int apic_raise_intr(void * private_data, int irq) {
879 // The Seastar is connected directly to the LAPIC via LINT0 on the ICC bus
882 struct vm_device * dev = (struct vm_device *)private_data;
883 struct apic_state * apic = (struct apic_state *)dev->private_data;
885 return activate_apic_irq(apic, irq);
891 static int apic_lower_intr(void * private_data, int irq) {
895 static int apic_begin_irq(void * private_data, int irq) {
896 struct vm_device * dev = (struct vm_device *)private_data;
897 struct apic_state * apic = (struct apic_state *)dev->private_data;
898 int major_offset = (irq & ~0x00000007) >> 3;
899 int minor_offset = irq & 0x00000007;
900 uchar_t * req_location = apic->int_req_reg + major_offset;
901 uchar_t * svc_location = apic->int_svc_reg + major_offset;
902 uchar_t flag = 0x01 << minor_offset;
904 *svc_location |= flag;
905 *req_location &= ~flag;
908 if ((irq == 238) || (irq == 239)) {
909 PrintError("APIC: Begin IRQ %d (ISR=%x), (IRR=%x)\n", irq, *svc_location, *req_location);
918 int v3_apic_raise_intr(struct vm_device * apic_dev, int intr_num) {
919 struct apic_state * apic = (struct apic_state *)apic_dev->private_data;
920 return activate_apic_irq(apic, intr_num);
925 /* Timer Functions */
926 static void apic_update_time(ullong_t cpu_cycles, ullong_t cpu_freq, void * priv_data) {
927 struct vm_device * dev = (struct vm_device *)priv_data;
928 struct apic_state * apic = (struct apic_state *)dev->private_data;
929 // The 32 bit GCC runtime is a pile of shit
931 uint64_t tmr_ticks = 0;
933 uint32_t tmr_ticks = 0;
936 uchar_t tmr_div = *(uchar_t *)&(apic->tmr_div_cfg.val);
937 uint_t shift_num = 0;
940 // Check whether this is true:
941 // -> If the Init count is zero then the timer is disabled
942 // and doesn't just blitz interrupts to the CPU
943 if ((apic->tmr_init_cnt == 0) ||
944 ( (apic->tmr_vec_tbl.tmr_mode == APIC_TMR_ONESHOT) &&
945 (apic->tmr_cur_cnt == 0))) {
946 //PrintDebug("APIC timer not yet initialized\n");
973 case APIC_TMR_DIV128:
977 PrintError("Invalid Timer Divider configuration\n");
981 tmr_ticks = cpu_cycles >> shift_num;
982 PrintDebug("Timer Ticks: %p\n", (void *)tmr_ticks);
984 if (tmr_ticks < apic->tmr_cur_cnt) {
985 apic->tmr_cur_cnt -= tmr_ticks;
987 tmr_ticks -= apic->tmr_cur_cnt;
988 apic->tmr_cur_cnt = 0;
991 PrintDebug("Raising APIC Timer interrupt (periodic=%d) (icnt=%d) (div=%d)\n",
992 apic->tmr_vec_tbl.tmr_mode, apic->tmr_init_cnt, shift_num);
994 if (activate_internal_irq(apic, APIC_TMR_INT) == -1) {
995 PrintError("Could not raise Timer interrupt\n");
998 if (apic->tmr_vec_tbl.tmr_mode == APIC_TMR_PERIODIC) {
999 tmr_ticks = tmr_ticks % apic->tmr_init_cnt;
1000 apic->tmr_cur_cnt = apic->tmr_init_cnt - tmr_ticks;
1009 static struct intr_ctrl_ops intr_ops = {
1010 .intr_pending = apic_intr_pending,
1011 .get_intr_number = apic_get_intr_number,
1012 .raise_intr = apic_raise_intr,
1013 .begin_irq = apic_begin_irq,
1014 .lower_intr = apic_lower_intr,
1018 static struct vm_timer_ops timer_ops = {
1019 .update_time = apic_update_time,
1023 static int apic_init(struct vm_device * dev) {
1024 struct guest_info * info = dev->vm;
1025 struct apic_state * apic = (struct apic_state *)(dev->private_data);
1027 v3_register_intr_controller(dev->vm, &intr_ops, dev);
1028 v3_add_timer(dev->vm, &timer_ops, dev);
1030 init_apic_state(apic);
1032 v3_hook_msr(info, BASE_ADDR_MSR, read_apic_msr, write_apic_msr, dev);
1034 v3_hook_full_mem(info, apic->base_addr, apic->base_addr + PAGE_SIZE_4KB, apic_read, apic_write, dev);
1039 static int apic_deinit(struct vm_device * dev) {
1040 struct guest_info * info = dev->vm;
1042 v3_unhook_msr(info, BASE_ADDR_MSR);
1048 static struct vm_device_ops dev_ops = {
1050 .deinit = apic_deinit,
1057 struct vm_device * v3_create_apic() {
1058 PrintDebug("Creating APIC\n");
1060 struct apic_state * apic = (struct apic_state *)V3_Malloc(sizeof(struct apic_state));
1062 struct vm_device * device = v3_create_device("APIC", &dev_ops, apic);