1 #include "apic.h"
2 #include "apic_timer.h"
3 #include <common/cpu.h>
4 #include <common/glib.h>
5 #include <common/kprint.h>
6 #include <common/printk.h>
7 #include <driver/acpi/acpi.h>
8 #include <exception/gate.h>
9
10 #include <exception/softirq.h>
11 #include <process/process.h>
12 #include <sched/sched.h>
13
14 #pragma GCC push_options
15 #pragma GCC optimize("O0")
16 // 导出定义在irq.c中的中段门表
17 extern void (*interrupt_table[24])(void);
18
19 static bool flag_support_apic = false;
20 static bool flag_support_x2apic = false;
21 uint8_t __apic_enable_state = APIC_XAPIC_ENABLED;
22 static uint local_apic_version;
23 static uint local_apic_max_LVT_entries;
24
25 static struct acpi_Multiple_APIC_Description_Table_t *madt;
26 static struct acpi_IO_APIC_Structure_t *io_apic_ICS;
27
28 static void __local_apic_xapic_init();
29 static void __local_apic_x2apic_init();
30
__send_eoi()31 static __always_inline void __send_eoi()
32 {
33 if (CURRENT_APIC_STATE == APIC_X2APIC_ENABLED)
34 {
35 __asm__ __volatile__("movq $0x00, %%rdx \n\t"
36 "movq $0x00, %%rax \n\t"
37 "movq $0x80b, %%rcx \n\t"
38 "wrmsr \n\t" ::
39 : "memory");
40 }
41 else
42 {
43
44 io_mfence();
45 __write4b(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_EOI, 0);
46 io_mfence();
47 }
48 }
49
50 /**
51 * @brief 初始化io_apic
52 *
53 */
apic_io_apic_init()54 void apic_io_apic_init()
55 {
56
57 ul madt_addr;
58 acpi_iter_SDT(acpi_get_MADT, &madt_addr);
59 madt = (struct acpi_Multiple_APIC_Description_Table_t *)madt_addr;
60
61 // kdebug("MADT->local intr controller addr=%#018lx", madt->Local_Interrupt_Controller_Address);
62 // kdebug("MADT->length= %d bytes", madt->header.Length);
63 // 寻找io apic的ICS
64 void *ent = (void *)(madt_addr) + sizeof(struct acpi_Multiple_APIC_Description_Table_t);
65 struct apic_Interrupt_Controller_Structure_header_t *header =
66 (struct apic_Interrupt_Controller_Structure_header_t *)ent;
67 while (header->length > 2)
68 {
69 header = (struct apic_Interrupt_Controller_Structure_header_t *)ent;
70 if (header->type == 1)
71 {
72 struct acpi_IO_APIC_Structure_t *t = (struct acpi_IO_APIC_Structure_t *)ent;
73 // kdebug("IO apic addr = %#018lx", t->IO_APIC_Address);
74 io_apic_ICS = t;
75 break;
76 }
77
78 ent += header->length;
79 }
80 // kdebug("Global_System_Interrupt_Base=%d", io_apic_ICS->Global_System_Interrupt_Base);
81
82 apic_ioapic_map.addr_phys = io_apic_ICS->IO_APIC_Address;
83 apic_ioapic_map.virtual_index_addr = (unsigned char *)APIC_IO_APIC_VIRT_BASE_ADDR;
84 apic_ioapic_map.virtual_data_addr = (uint *)(APIC_IO_APIC_VIRT_BASE_ADDR + 0x10);
85 apic_ioapic_map.virtual_EOI_addr = (uint *)(APIC_IO_APIC_VIRT_BASE_ADDR + 0x40);
86
87 // kdebug("(ul)apic_ioapic_map.virtual_index_addr=%#018lx", (ul)apic_ioapic_map.virtual_index_addr);
88 // 填写页表，完成地址映射
89 mm_map_phys_addr((ul)apic_ioapic_map.virtual_index_addr, apic_ioapic_map.addr_phys, PAGE_2M_SIZE,
90 PAGE_KERNEL_PAGE | PAGE_PWT | PAGE_PCD, false);
91
92 // 设置IO APIC ID 为0x0f000000
93 *apic_ioapic_map.virtual_index_addr = 0x00;
94 io_mfence();
95 *apic_ioapic_map.virtual_data_addr = 0x0f000000;
96 io_mfence();
97
98 // kdebug("I/O APIC ID:%#010x", ((*apic_ioapic_map.virtual_data_addr) >> 24) & 0xff);
99 io_mfence();
100
101 // 获取IO APIC Version
102 *apic_ioapic_map.virtual_index_addr = 0x01;
103 io_mfence();
104 kdebug("IO APIC Version=%d, Max Redirection Entries=%d", *apic_ioapic_map.virtual_data_addr & 0xff,
105 (((*apic_ioapic_map.virtual_data_addr) >> 16) & 0xff) + 1);
106
107 // 初始化RTE表项，将所有RTE表项屏蔽
108 for (int i = 0x10; i < 0x40; i += 2)
109 {
110 // 以0x20为起始中断向量号，初始化RTE
111 apic_ioapic_write_rte(i, 0x10020 + ((i - 0x10) >> 1));
112 }
113
114 // 不需要手动启动IO APIC，只要初始化了RTE寄存器之后，io apic就会自动启用了。
115 // 而且不是每台电脑都有RCBA寄存器，因此不需要手动启用IO APIC
116 }
117
118 /**
119 * @brief 初始化AP处理器的Local apic
120 *
121 */
apic_init_ap_core_local_apic()122 void apic_init_ap_core_local_apic()
123 {
124 kinfo("Initializing AP-core's local apic...");
125 uint eax, edx;
126 // 启用xAPIC 和x2APIC
127 uint64_t ia32_apic_base = rdmsr(0x1b);
128 ia32_apic_base |= (1 << 11);
129 if (flag_support_x2apic) // 如果支持x2apic，则启用
130 {
131 ia32_apic_base |= (1 << 10);
132 wrmsr(0x1b, ia32_apic_base);
133 }
134 ia32_apic_base = rdmsr(0x1b);
135 eax = ia32_apic_base & 0xffffffff;
136
137 // 检测是否成功启用xAPIC和x2APIC
138 if ((eax & 0xc00) == 0xc00)
139 kinfo("xAPIC & x2APIC enabled!");
140 else if ((eax & 0x800) == 0x800)
141 kinfo("Only xAPIC enabled!");
142 else
143 kerror("Both xAPIC and x2APIC are not enabled.");
144
145 // 设置SVR寄存器，开启local APIC、禁止EOI广播
146 if (flag_support_x2apic) // 当前为x2APIC
147 __local_apic_x2apic_init();
148 else // 当前为xapic
149 __local_apic_xapic_init();
150 }
151
152 /**
153 * @brief 当前使用xapic来初始化local apic
154 *
155 */
__local_apic_xapic_init()156 static void __local_apic_xapic_init()
157 {
158 __apic_enable_state = APIC_XAPIC_ENABLED;
159 // 设置svr的 apic软件使能位
160 uint64_t qword = *(uint64_t *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_SVR);
161
162 qword |= (1 << 8);
163 *(uint64_t *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_SVR) = qword;
164 qword = *(uint64_t *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_SVR);
165 if (qword & 0x100)
166 kinfo("APIC Software Enabled.");
167 if (qword & 0x1000)
168 kinfo("EOI-Broadcast Suppression Enabled.");
169
170 // 从 Local APIC Version register 获取Local APIC Version
171 qword = *(uint64_t *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_Version);
172 qword &= 0xffffffff;
173
174 local_apic_max_LVT_entries = ((qword >> 16) & 0xff) + 1;
175 local_apic_version = qword & 0xff;
176
177 kdebug("local APIC Version:%#010x,Max LVT Entry:%#010x,SVR(Suppress EOI Broadcast):%#04x\t", local_apic_version,
178 local_apic_max_LVT_entries, (qword >> 24) & 0x1);
179
180 if ((qword & 0xff) < 0x10)
181 {
182 kdebug("82489DX discrete APIC");
183 }
184 else if (((qword & 0xff) >= 0x10) && ((qword & 0xff) <= 0x15))
185 kdebug("Integrated APIC.");
186
187 io_mfence();
188 // 如果写入这里的话，在有的机器上面会报错
189 // *(uint *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_LVT_CMCI) = APIC_LVT_INT_MASKED;
190 io_mfence();
191 *(uint *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_LVT_TIMER) = APIC_LVT_INT_MASKED;
192 io_mfence();
193
194 *(uint *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_LVT_THERMAL) = APIC_LVT_INT_MASKED;
195 io_mfence();
196 *(uint *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_LVT_PERFORMANCE_MONITOR) =
197 APIC_LVT_INT_MASKED;
198 io_mfence();
199 *(uint *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_LVT_LINT0) = APIC_LVT_INT_MASKED;
200 io_mfence();
201 *(uint *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_LVT_LINT1) = APIC_LVT_INT_MASKED;
202 io_mfence();
203 *(uint *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_LVT_ERROR) = APIC_LVT_INT_MASKED;
204 io_mfence();
205
206 kdebug("All LVT Masked");
207 }
208
209 /**
210 * @brief 当前使用x2apic来初始化local apic
211 *
212 */
__local_apic_x2apic_init()213 static void __local_apic_x2apic_init()
214 {
215 __apic_enable_state = APIC_X2APIC_ENABLED;
216 uint32_t eax, edx;
217 __asm__ __volatile__("movq $0x80f, %%rcx \n\t"
218 "rdmsr \n\t"
219 "bts $8, %%rax \n\t"
220 // "bts $12, %%rax \n\t"
221 "movq $0x80f, %%rcx \n\t"
222 "wrmsr \n\t"
223 "movq $0x80f , %%rcx \n\t"
224 "rdmsr \n\t"
225 : "=a"(eax), "=d"(edx)::"memory");
226 if (eax & 0x100)
227 kinfo("APIC Software Enabled.");
228 if (eax & 0x1000)
229 kinfo("EOI-Broadcast Suppression Enabled.");
230
231 // 获取Local APIC Version
232 // 0x803处是 Local APIC Version register
233 __asm__ __volatile__("movq $0x803, %%rcx \n\t"
234 "rdmsr \n\t"
235 : "=a"(eax), "=d"(edx)::"memory");
236
237 local_apic_max_LVT_entries = ((eax >> 16) & 0xff) + 1;
238 local_apic_version = eax & 0xff;
239
240 kdebug("local APIC Version:%#010x,Max LVT Entry:%#010x,SVR(Suppress EOI Broadcast):%#04x\t", local_apic_version,
241 local_apic_max_LVT_entries, (eax >> 24) & 0x1);
242
243 if ((eax & 0xff) < 0x10)
244 kdebug("82489DX discrete APIC");
245 else if (((eax & 0xff) >= 0x10) && ((eax & 0xff) <= 0x15))
246 kdebug("Integrated APIC.");
247
248 // 由于尚未配置LVT对应的处理程序，因此先屏蔽所有的LVT
249 __asm__ __volatile__( // "movq $0x82f, %%rcx \n\t" // CMCI
250 // "wrmsr \n\t"
251 "movq $0x832, %%rcx \n\t" // Timer
252 "wrmsr \n\t"
253 "movq $0x833, %%rcx \n\t" // Thermal Monitor
254 "wrmsr \n\t"
255 "movq $0x834, %%rcx \n\t" // Performance Counter
256 "wrmsr \n\t"
257 "movq $0x835, %%rcx \n\t" // LINT0
258 "wrmsr \n\t"
259 "movq $0x836, %%rcx \n\t" // LINT1
260 "wrmsr \n\t"
261 "movq $0x837, %%rcx \n\t" // Error
262 "wrmsr \n\t"
263 :
264 : "a"(0x10000), "d"(0x00)
265 : "memory");
266 kdebug("All LVT Masked");
267 }
268
269 /**
270 * @brief 初始化local apic
271 *
272 */
apic_local_apic_init()273 void apic_local_apic_init()
274 {
275 uint64_t ia32_apic_base = rdmsr(0x1b);
276 // kdebug("apic base=%#018lx", (ia32_apic_base & 0x1FFFFFFFFFF000));
277 // 映射Local APIC 寄存器地址
278 mm_map_phys_addr(APIC_LOCAL_APIC_VIRT_BASE_ADDR, (ia32_apic_base & 0x1FFFFFFFFFFFFF), PAGE_2M_SIZE,
279 PAGE_KERNEL_PAGE | PAGE_PWT | PAGE_PCD, false);
280 uint a, b, c, d;
281
282 cpu_cpuid(1, 0, &a, &b, &c, &d);
283
284 // kdebug("CPUID 0x01, eax:%#010lx, ebx:%#010lx, ecx:%#010lx, edx:%#010lx", a, b, c, d);
285
286 // 判断是否支持APIC和xAPIC
287 if ((1 << 9) & d)
288 {
289 flag_support_apic = true;
290 kdebug("This computer support APIC&xAPIC");
291 }
292 else
293 {
294 flag_support_apic = false;
295 kerror("This computer does not support APIC&xAPIC");
296 while (1)
297 ;
298 }
299
300 // 判断是否支持x2APIC
301 if ((1 << 21) & c)
302 {
303 flag_support_x2apic = true;
304 kdebug("This computer support x2APIC");
305 }
306 else
307 {
308 flag_support_x2apic = false;
309 kwarn("This computer does not support x2APIC");
310 }
311
312 uint eax, edx;
313 // 启用xAPIC 和x2APIC
314 ia32_apic_base = rdmsr(0x1b);
315 ia32_apic_base |= (1 << 11);
316 if (flag_support_x2apic) // 如果支持x2apic，则启用
317 {
318 ia32_apic_base |= (1 << 10);
319 wrmsr(0x1b, ia32_apic_base);
320 }
321 ia32_apic_base = rdmsr(0x1b);
322 eax = ia32_apic_base & 0xffffffff;
323
324 // 检测是否成功启用xAPIC和x2APIC
325 if ((eax & 0xc00) == 0xc00)
326 kinfo("xAPIC & x2APIC enabled!");
327 else if ((eax & 0x800) == 0x800)
328 kinfo("Only xAPIC enabled!");
329 else
330 kerror("Both xAPIC and x2APIC are not enabled.");
331
332 // 设置SVR寄存器，开启local APIC、禁止EOI广播
333 if (flag_support_x2apic) // 当前为x2APIC
334 __local_apic_x2apic_init();
335 else // 当前为xapic
336 __local_apic_xapic_init();
337
338 // 获取Local APIC的基础信息 （参见英特尔开发手册Vol3A 10-39）
339 // Table 10-6. Local APIC Register Address Map Supported by x2APIC
340 // 获取 Local APIC ID
341 // 0x802处是x2APIC ID 位宽32bits 的 Local APIC ID register
342 /*
343 __asm__ __volatile__("movq $0x802, %%rcx \n\t"
344 "rdmsr \n\t"
345 : "=a"(eax), "=d"(edx)::"memory");
346 */
347 // kdebug("get Local APIC ID: edx=%#010x, eax=%#010x", edx, eax);
348 // kdebug("local_apic_id=%#018lx", *(uint *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_ID));
349 }
350
351 /**
352 * @brief 初始化apic控制器
353 *
354 */
apic_init()355 int apic_init()
356 {
357 // 初始化中断门， 中断使用rsp0防止在软中断时发生嵌套，然后处理器重新加载导致数据被抹掉
358 for (int i = 32; i <= 55; ++i)
359 set_intr_gate(i, 0, interrupt_table[i - 32]);
360
361 // 设置local apic中断门
362 for (int i = 150; i < 160; ++i)
363 set_intr_gate(i, 0, local_apic_interrupt_table[i - 150]);
364
365 // 屏蔽类8259A芯片
366 io_out8(0x21, 0xff);
367
368 io_out8(0xa1, 0xff);
369
370 // 写入8259A pic的EOI位
371 io_out8(0x20, 0x20);
372 io_out8(0xa0, 0x20);
373
374 kdebug("8259A Masked.");
375
376 // enable IMCR
377 io_out8(0x22, 0x70);
378 io_out8(0x23, 0x01);
379
380 apic_local_apic_init();
381
382 apic_io_apic_init();
383
384 // get RCBA address
385 io_out32(0xcf8, 0x8000f8f0);
386 uint32_t RCBA_phys = io_in32(0xcfc);
387
388 // 获取RCBA寄存器的地址
389 if (RCBA_phys > 0xfec00000 && RCBA_phys < 0xfee00000)
390 RCBA_vaddr = SPECIAL_MEMOEY_MAPPING_VIRT_ADDR_BASE + RCBA_phys;
391 else
392 {
393 RCBA_vaddr = 0;
394 kwarn("Cannot get RCBA address. RCBA_phys=%#010lx", RCBA_phys);
395 }
396 sti();
397 return 0;
398 }
399 /**
400 * @brief 中断服务程序
401 *
402 * @param rsp 中断栈指针
403 * @param number 中断向量号
404 */
do_IRQ(struct pt_regs * rsp,ul number)405 void do_IRQ(struct pt_regs *rsp, ul number)
406 {
407
408 if (number < 0x80 && number >= 32) // 以0x80为界限，低于0x80的是外部中断控制器，高于0x80的是Local APIC
409 {
410 // ==========外部中断控制器========
411 irq_desc_t *irq = &interrupt_desc[number - 32];
412
413 // 执行中断上半部处理程序
414 if (irq != NULL && irq->handler != NULL)
415 irq->handler(number, irq->parameter, rsp);
416 else
417 kwarn("Intr vector [%d] does not have a handler!");
418 // 向中断控制器发送应答消息
419 if (irq->controller != NULL && irq->controller->ack != NULL)
420 irq->controller->ack(number);
421 else
422 __send_eoi();
423 }
424 else if (number >= 200)
425 {
426 apic_local_apic_edge_ack(number);
427
428 {
429 irq_desc_t *irq = &SMP_IPI_desc[number - 200];
430 if (irq->handler != NULL)
431 irq->handler(number, irq->parameter, rsp);
432 }
433 }
434 else if (number >= 150 && number < 200)
435 {
436 irq_desc_t *irq = &local_apic_interrupt_desc[number - 150];
437
438 // 执行中断上半部处理程序
439 if (irq != NULL && irq->handler != NULL)
440 irq->handler(number, irq->parameter, rsp);
441 else
442 kwarn("Intr vector [%d] does not have a handler!");
443 // 向中断控制器发送应答消息
444 if (irq->controller != NULL && irq->controller->ack != NULL)
445 irq->controller->ack(number);
446 else
447 __send_eoi(); // 向EOI寄存器写入0x00表示结束中断
448 }
449 else
450 {
451
452 kwarn("do IRQ receive: %d", number);
453 // 忽略未知中断
454 return;
455 }
456
457 // kdebug("before softirq");
458 // 进入软中断处理程序
459 rs_do_softirq();
460
461 // kdebug("after softirq");
462 // 检测当前进程是否持有自旋锁，若持有自旋锁，则不进行抢占式的进程调度
463 if (current_pcb->preempt_count > 0)
464 return;
465 else if (current_pcb->preempt_count < 0)
466 kBUG("current_pcb->preempt_count<0! pid=%d", current_pcb->pid); // should not be here
467
468 // 检测当前进程是否可被调度
469 if (current_pcb->flags & PF_NEED_SCHED && number == APIC_TIMER_IRQ_NUM)
470 {
471 io_mfence();
472 sched();
473 }
474 }
475
476 /**
477 * @brief 读取RTE寄存器
478 * 由于RTE位宽为64位而IO window寄存器只有32位，因此需要两次读取
479 * @param index 索引值
480 * @return ul
481 */
apic_ioapic_read_rte(unsigned char index)482 ul apic_ioapic_read_rte(unsigned char index)
483 {
484 // 由于处理器的乱序执行的问题，需要加入内存屏障以保证结果的正确性。
485 ul ret;
486 // 先读取高32bit
487 *apic_ioapic_map.virtual_index_addr = index + 1;
488 io_mfence();
489
490 ret = *apic_ioapic_map.virtual_data_addr;
491 ret <<= 32;
492 io_mfence();
493
494 // 读取低32bit
495 *apic_ioapic_map.virtual_index_addr = index;
496 io_mfence();
497 ret |= *apic_ioapic_map.virtual_data_addr;
498 io_mfence();
499
500 return ret;
501 }
502
503 /**
504 * @brief 写入RTE寄存器
505 *
506 * @param index 索引值
507 * @param value 要写入的值
508 */
apic_ioapic_write_rte(unsigned char index,ul value)509 void apic_ioapic_write_rte(unsigned char index, ul value)
510 {
511 // 先写入低32bit
512 *apic_ioapic_map.virtual_index_addr = index;
513 io_mfence();
514
515 *apic_ioapic_map.virtual_data_addr = value & 0xffffffff;
516 io_mfence();
517 // 再写入高32bit
518 value >>= 32;
519 io_mfence();
520 *apic_ioapic_map.virtual_index_addr = index + 1;
521 io_mfence();
522 *apic_ioapic_map.virtual_data_addr = value & 0xffffffff;
523 io_mfence();
524 }
525
526 // =========== 中断控制操作接口 ============
apic_ioapic_enable(ul irq_num)527 void apic_ioapic_enable(ul irq_num)
528 {
529 ul index = 0x10 + ((irq_num - 32) << 1);
530 ul value = apic_ioapic_read_rte(index);
531 value &= (~0x10000UL);
532 apic_ioapic_write_rte(index, value);
533 }
534
apic_ioapic_disable(ul irq_num)535 void apic_ioapic_disable(ul irq_num)
536 {
537 ul index = 0x10 + ((irq_num - 32) << 1);
538 ul value = apic_ioapic_read_rte(index);
539 value |= (0x10000UL);
540 apic_ioapic_write_rte(index, value);
541 }
542
apic_ioapic_install(ul irq_num,void * arg)543 ul apic_ioapic_install(ul irq_num, void *arg)
544 {
545 struct apic_IO_APIC_RTE_entry *entry = (struct apic_IO_APIC_RTE_entry *)arg;
546 // RTE表项值写入对应的RTE寄存器
547 apic_ioapic_write_rte(0x10 + ((irq_num - 32) << 1), *(ul *)entry);
548 return 0;
549 }
550
apic_ioapic_uninstall(ul irq_num)551 void apic_ioapic_uninstall(ul irq_num)
552 {
553 // 将对应的RTE表项设置为屏蔽状态
554 apic_ioapic_write_rte(0x10 + ((irq_num - 32) << 1), 0x10000UL);
555 }
556
apic_ioapic_level_ack(ul irq_num)557 void apic_ioapic_level_ack(ul irq_num) // 电平触发
558 {
559 __send_eoi();
560 *apic_ioapic_map.virtual_EOI_addr = irq_num;
561 }
562
apic_ioapic_edge_ack(ul irq_num)563 void apic_ioapic_edge_ack(ul irq_num) // 边沿触发
564 {
565
566 // 向EOI寄存器写入0x00表示结束中断
567 /*
568 uint *eoi = (uint *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_EOI);
569 *eoi = 0x00;
570
571 */
572 __send_eoi();
573 }
574
575 /**
576 * @brief local apic 边沿触发应答
577 *
578 * @param irq_num
579 */
580
apic_local_apic_edge_ack(ul irq_num)581 void apic_local_apic_edge_ack(ul irq_num)
582 {
583 // 向EOI寄存器写入0x00表示结束中断
584 __send_eoi();
585 }
586
587 /**
588 * @brief 读取指定类型的 Interrupt Control Structure
589 *
590 * @param type ics的类型
591 * @param ret_vaddr 对应的ICS的虚拟地址数组
592 * @param total 返回数组的元素总个数
593 * @return uint
594 */
apic_get_ics(const uint type,ul ret_vaddr[],uint * total)595 uint apic_get_ics(const uint type, ul ret_vaddr[], uint *total)
596 {
597 void *ent = (void *)(madt) + sizeof(struct acpi_Multiple_APIC_Description_Table_t);
598 struct apic_Interrupt_Controller_Structure_header_t *header =
599 (struct apic_Interrupt_Controller_Structure_header_t *)ent;
600 bool flag = false;
601
602 uint cnt = 0;
603
604 while (header->length > 2)
605 {
606 header = (struct apic_Interrupt_Controller_Structure_header_t *)ent;
607 if (header->type == type)
608 {
609 ret_vaddr[cnt++] = (ul)ent;
610 flag = true;
611 }
612 ent += header->length;
613 }
614
615 *total = cnt;
616 if (!flag)
617 return APIC_E_NOTFOUND;
618 else
619 return APIC_SUCCESS;
620 }
621
622 /**
623 * @brief 构造RTE Entry结构体
624 *
625 * @param entry 返回的结构体
626 * @param vector 中断向量
627 * @param deliver_mode 投递模式
628 * @param dest_mode 目标模式
629 * @param deliver_status 投递状态
630 * @param polarity 电平触发极性
631 * @param irr 远程IRR标志位（只读）
632 * @param trigger 触发模式
633 * @param mask 屏蔽标志位，（0为未屏蔽， 1为已屏蔽）
634 * @param dest_apicID 目标apicID
635 */
apic_make_rte_entry(struct apic_IO_APIC_RTE_entry * entry,uint8_t vector,uint8_t deliver_mode,uint8_t dest_mode,uint8_t deliver_status,uint8_t polarity,uint8_t irr,uint8_t trigger,uint8_t mask,uint8_t dest_apicID)636 void apic_make_rte_entry(struct apic_IO_APIC_RTE_entry *entry, uint8_t vector, uint8_t deliver_mode, uint8_t dest_mode,
637 uint8_t deliver_status, uint8_t polarity, uint8_t irr, uint8_t trigger, uint8_t mask,
638 uint8_t dest_apicID)
639 {
640
641 entry->vector = vector;
642 entry->deliver_mode = deliver_mode;
643 entry->dest_mode = dest_mode;
644 entry->deliver_status = deliver_status;
645 entry->polarity = polarity;
646 entry->remote_IRR = irr;
647 entry->trigger_mode = trigger;
648 entry->mask = mask;
649
650 entry->reserved = 0;
651
652 if (dest_mode == DEST_PHYSICAL)
653 {
654 entry->destination.physical.phy_dest = dest_apicID;
655 entry->destination.physical.reserved1 = 0;
656 entry->destination.physical.reserved2 = 0;
657 }
658 else
659 {
660 entry->destination.logical.logical_dest = dest_apicID;
661 entry->destination.logical.reserved1 = 0;
662 }
663 }
664
665 /**
666 * @brief 获取当前处理器的local apic id
667 *
668 * @return uint32_t
669 */
apic_get_local_apic_id()670 uint32_t apic_get_local_apic_id()
671 {
672 // 获取Local APIC的基础信息 （参见英特尔开发手册Vol3A 10-39）
673 // Table 10-6. Local APIC Register Address Map Supported by x2APIC
674
675 if (flag_support_x2apic)
676 {
677 // 获取 Local APIC ID
678 // 0x802处是x2APIC ID 位宽32bits 的 Local APIC ID register
679 uint32_t x = 0;
680 __asm__ __volatile__("movq $0x802, %%rcx \n\t"
681 "rdmsr \n\t"
682 : "=a"(x)::"memory");
683 return x;
684 }
685 else
686 {
687 // kdebug("get Local APIC ID: edx=%#010x, eax=%#010x", edx, eax);
688 // kdebug("local_apic_id=%#018lx", );
689
690 uint32_t x = *(uint32_t *)(APIC_LOCAL_APIC_VIRT_BASE_ADDR + LOCAL_APIC_OFFSET_Local_APIC_ID);
691 x = ((x >> 24) & 0xff);
692 return x;
693 }
694 }
695 #pragma GCC pop_options