1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2008-2011
4 * Graeme Russ, <graeme.russ@gmail.com>
5 *
6 * (C) Copyright 2002
7 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
8 *
9 * Portions of this file are derived from the Linux kernel source
10 * Copyright (C) 1991, 1992 Linus Torvalds
11 */
12
13 #include <common.h>
14 #include <dm.h>
15 #include <asm/control_regs.h>
16 #include <asm/i8259.h>
17 #include <asm/interrupt.h>
18 #include <asm/io.h>
19 #include <asm/lapic.h>
20 #include <asm/processor-flags.h>
21
22 DECLARE_GLOBAL_DATA_PTR;
23
24 #define DECLARE_INTERRUPT(x) \
25 ".globl irq_"#x"\n" \
26 ".hidden irq_"#x"\n" \
27 ".type irq_"#x", @function\n" \
28 "irq_"#x":\n" \
29 "pushl $"#x"\n" \
30 "jmp.d32 irq_common_entry\n"
31
32 static char *exceptions[] = {
33 "Divide Error",
34 "Debug",
35 "NMI Interrupt",
36 "Breakpoint",
37 "Overflow",
38 "BOUND Range Exceeded",
39 "Invalid Opcode (Undefined Opcode)",
40 "Device Not Avaiable (No Math Coprocessor)",
41 "Double Fault",
42 "Coprocessor Segment Overrun",
43 "Invalid TSS",
44 "Segment Not Present",
45 "Stack Segment Fault",
46 "General Protection",
47 "Page Fault",
48 "Reserved",
49 "x87 FPU Floating-Point Error",
50 "Alignment Check",
51 "Machine Check",
52 "SIMD Floating-Point Exception",
53 "Virtualization Exception",
54 "Reserved",
55 "Reserved",
56 "Reserved",
57 "Reserved",
58 "Reserved",
59 "Reserved",
60 "Reserved",
61 "Reserved",
62 "Reserved",
63 "Reserved",
64 "Reserved"
65 };
66
dump_regs(struct irq_regs * regs)67 static void dump_regs(struct irq_regs *regs)
68 {
69 unsigned long cs, eip, eflags;
70 unsigned long cr0 = 0L, cr2 = 0L, cr3 = 0L, cr4 = 0L;
71 unsigned long d0, d1, d2, d3, d6, d7;
72 unsigned long sp;
73
74 /*
75 * Some exceptions cause an error code to be saved on the current stack
76 * after the EIP value. We should extract CS/EIP/EFLAGS from different
77 * position on the stack based on the exception number.
78 */
79 switch (regs->irq_id) {
80 case EXC_DF:
81 case EXC_TS:
82 case EXC_NP:
83 case EXC_SS:
84 case EXC_GP:
85 case EXC_PF:
86 case EXC_AC:
87 cs = regs->context.ctx2.xcs;
88 eip = regs->context.ctx2.eip;
89 eflags = regs->context.ctx2.eflags;
90 /* We should fix up the ESP due to error code */
91 regs->esp += 4;
92 break;
93 default:
94 cs = regs->context.ctx1.xcs;
95 eip = regs->context.ctx1.eip;
96 eflags = regs->context.ctx1.eflags;
97 break;
98 }
99
100 printf("EIP: %04x:[<%08lx>] EFLAGS: %08lx\n",
101 (u16)cs, eip, eflags);
102 if (gd->flags & GD_FLG_RELOC)
103 printf("Original EIP :[<%08lx>]\n", eip - gd->reloc_off);
104
105 printf("EAX: %08lx EBX: %08lx ECX: %08lx EDX: %08lx\n",
106 regs->eax, regs->ebx, regs->ecx, regs->edx);
107 printf("ESI: %08lx EDI: %08lx EBP: %08lx ESP: %08lx\n",
108 regs->esi, regs->edi, regs->ebp, regs->esp);
109 printf(" DS: %04x ES: %04x FS: %04x GS: %04x SS: %04x\n",
110 (u16)regs->xds, (u16)regs->xes, (u16)regs->xfs,
111 (u16)regs->xgs, (u16)regs->xss);
112
113 cr0 = read_cr0();
114 cr2 = read_cr2();
115 cr3 = read_cr3();
116 cr4 = read_cr4();
117
118 printf("CR0: %08lx CR2: %08lx CR3: %08lx CR4: %08lx\n",
119 cr0, cr2, cr3, cr4);
120
121 d0 = get_debugreg(0);
122 d1 = get_debugreg(1);
123 d2 = get_debugreg(2);
124 d3 = get_debugreg(3);
125
126 printf("DR0: %08lx DR1: %08lx DR2: %08lx DR3: %08lx\n",
127 d0, d1, d2, d3);
128
129 d6 = get_debugreg(6);
130 d7 = get_debugreg(7);
131 printf("DR6: %08lx DR7: %08lx\n",
132 d6, d7);
133
134 printf("Stack:\n");
135 sp = regs->esp;
136
137 sp += 64;
138
139 while (sp > (regs->esp - 16)) {
140 if (sp == regs->esp)
141 printf("--->");
142 else
143 printf(" ");
144 printf("0x%8.8lx : 0x%8.8lx\n", sp, (ulong)readl(sp));
145 sp -= 4;
146 }
147 }
148
do_exception(struct irq_regs * regs)149 static void do_exception(struct irq_regs *regs)
150 {
151 printf("%s\n", exceptions[regs->irq_id]);
152 dump_regs(regs);
153 hang();
154 }
155
156 struct idt_entry {
157 u16 base_low;
158 u16 selector;
159 u8 res;
160 u8 access;
161 u16 base_high;
162 } __packed;
163
164 struct desc_ptr {
165 unsigned short size;
166 unsigned long address;
167 } __packed;
168
169 struct idt_entry idt[256] __aligned(16);
170
171 struct desc_ptr idt_ptr;
172
load_idt(const struct desc_ptr * dtr)173 static inline void load_idt(const struct desc_ptr *dtr)
174 {
175 asm volatile("cs lidt %0" : : "m" (*dtr));
176 }
177
set_vector(u8 intnum,void * routine)178 void set_vector(u8 intnum, void *routine)
179 {
180 idt[intnum].base_high = (u16)((ulong)(routine) >> 16);
181 idt[intnum].base_low = (u16)((ulong)(routine) & 0xffff);
182 }
183
184 /*
185 * Ideally these would be defined static to avoid a checkpatch warning, but
186 * the compiler cannot see them in the inline asm and complains that they
187 * aren't defined
188 */
189 void irq_0(void);
190 void irq_1(void);
191
cpu_init_interrupts(void)192 int cpu_init_interrupts(void)
193 {
194 int i;
195
196 int irq_entry_size = irq_1 - irq_0;
197 void *irq_entry = (void *)irq_0;
198
199 /* Setup the IDT */
200 for (i = 0; i < 256; i++) {
201 idt[i].access = 0x8e;
202 idt[i].res = 0;
203 idt[i].selector = X86_GDT_ENTRY_32BIT_CS * X86_GDT_ENTRY_SIZE;
204 set_vector(i, irq_entry);
205 irq_entry += irq_entry_size;
206 }
207
208 idt_ptr.size = 256 * 8 - 1;
209 idt_ptr.address = (unsigned long) idt;
210
211 load_idt(&idt_ptr);
212
213 return 0;
214 }
215
x86_get_idt(void)216 void *x86_get_idt(void)
217 {
218 return &idt_ptr;
219 }
220
__do_irq(int irq)221 void __do_irq(int irq)
222 {
223 printf("Unhandled IRQ : %d\n", irq);
224 }
225 void do_irq(int irq) __attribute__((weak, alias("__do_irq")));
226
enable_interrupts(void)227 void enable_interrupts(void)
228 {
229 asm("sti\n");
230 }
231
disable_interrupts(void)232 int disable_interrupts(void)
233 {
234 long flags;
235
236 #if CONFIG_IS_ENABLED(X86_64)
237 asm volatile ("pushfq ; popq %0 ; cli\n" : "=g" (flags) : );
238 #else
239 asm volatile ("pushfl ; popl %0 ; cli\n" : "=g" (flags) : );
240 #endif
241 return flags & X86_EFLAGS_IF;
242 }
243
interrupt_init(void)244 int interrupt_init(void)
245 {
246 struct udevice *dev;
247 int ret;
248
249 /* Try to set up the interrupt router, but don't require one */
250 ret = uclass_first_device_err(UCLASS_IRQ, &dev);
251 if (ret && ret != -ENODEV)
252 return ret;
253
254 /*
255 * When running as an EFI application we are not in control of
256 * interrupts and should leave them alone.
257 */
258 #ifndef CONFIG_EFI_APP
259 /* Just in case... */
260 disable_interrupts();
261
262 #ifdef CONFIG_I8259_PIC
263 /* Initialize the master/slave i8259 pic */
264 i8259_init();
265 #endif
266
267 lapic_setup();
268
269 /* Initialize core interrupt and exception functionality of CPU */
270 cpu_init_interrupts();
271
272 /*
273 * It is now safe to enable interrupts.
274 *
275 * TODO(sjg@chromium.org): But we don't handle these correctly when
276 * booted from EFI.
277 */
278 if (ll_boot_init())
279 enable_interrupts();
280 #endif
281
282 return 0;
283 }
284
285 /* IRQ Low-Level Service Routine */
irq_llsr(struct irq_regs * regs)286 void irq_llsr(struct irq_regs *regs)
287 {
288 /*
289 * For detailed description of each exception, refer to:
290 * Intel® 64 and IA-32 Architectures Software Developer's Manual
291 * Volume 1: Basic Architecture
292 * Order Number: 253665-029US, November 2008
293 * Table 6-1. Exceptions and Interrupts
294 */
295 if (regs->irq_id < 32) {
296 /* Architecture defined exception */
297 do_exception(regs);
298 } else {
299 /* Hardware or User IRQ */
300 do_irq(regs->irq_id);
301 }
302 }
303
304 /*
305 * OK - This looks really horrible, but it serves a purpose - It helps create
306 * fully relocatable code.
307 * - The call to irq_llsr will be a relative jump
308 * - The IRQ entries will be guaranteed to be in order
309 * Interrupt entries are now very small (a push and a jump) but they are
310 * now slower (all registers pushed on stack which provides complete
311 * crash dumps in the low level handlers
312 *
313 * Interrupt Entry Point:
314 * - Interrupt has caused eflags, CS and EIP to be pushed
315 * - Interrupt Vector Handler has pushed orig_eax
316 * - pt_regs.esp needs to be adjusted by 40 bytes:
317 * 12 bytes pushed by CPU (EFLAGSF, CS, EIP)
318 * 4 bytes pushed by vector handler (irq_id)
319 * 24 bytes pushed before SP (SS, GS, FS, ES, DS, EAX)
320 * NOTE: Only longs are pushed on/popped off the stack!
321 */
322 asm(".globl irq_common_entry\n" \
323 ".hidden irq_common_entry\n" \
324 ".type irq_common_entry, @function\n" \
325 "irq_common_entry:\n" \
326 "cld\n" \
327 "pushl %ss\n" \
328 "pushl %gs\n" \
329 "pushl %fs\n" \
330 "pushl %es\n" \
331 "pushl %ds\n" \
332 "pushl %eax\n" \
333 "movl %esp, %eax\n" \
334 "addl $40, %eax\n" \
335 "pushl %eax\n" \
336 "pushl %ebp\n" \
337 "pushl %edi\n" \
338 "pushl %esi\n" \
339 "pushl %edx\n" \
340 "pushl %ecx\n" \
341 "pushl %ebx\n" \
342 "mov %esp, %eax\n" \
343 "call irq_llsr\n" \
344 "popl %ebx\n" \
345 "popl %ecx\n" \
346 "popl %edx\n" \
347 "popl %esi\n" \
348 "popl %edi\n" \
349 "popl %ebp\n" \
350 "popl %eax\n" \
351 "popl %eax\n" \
352 "popl %ds\n" \
353 "popl %es\n" \
354 "popl %fs\n" \
355 "popl %gs\n" \
356 "popl %ss\n" \
357 "add $4, %esp\n" \
358 "iret\n" \
359 DECLARE_INTERRUPT(0) \
360 DECLARE_INTERRUPT(1) \
361 DECLARE_INTERRUPT(2) \
362 DECLARE_INTERRUPT(3) \
363 DECLARE_INTERRUPT(4) \
364 DECLARE_INTERRUPT(5) \
365 DECLARE_INTERRUPT(6) \
366 DECLARE_INTERRUPT(7) \
367 DECLARE_INTERRUPT(8) \
368 DECLARE_INTERRUPT(9) \
369 DECLARE_INTERRUPT(10) \
370 DECLARE_INTERRUPT(11) \
371 DECLARE_INTERRUPT(12) \
372 DECLARE_INTERRUPT(13) \
373 DECLARE_INTERRUPT(14) \
374 DECLARE_INTERRUPT(15) \
375 DECLARE_INTERRUPT(16) \
376 DECLARE_INTERRUPT(17) \
377 DECLARE_INTERRUPT(18) \
378 DECLARE_INTERRUPT(19) \
379 DECLARE_INTERRUPT(20) \
380 DECLARE_INTERRUPT(21) \
381 DECLARE_INTERRUPT(22) \
382 DECLARE_INTERRUPT(23) \
383 DECLARE_INTERRUPT(24) \
384 DECLARE_INTERRUPT(25) \
385 DECLARE_INTERRUPT(26) \
386 DECLARE_INTERRUPT(27) \
387 DECLARE_INTERRUPT(28) \
388 DECLARE_INTERRUPT(29) \
389 DECLARE_INTERRUPT(30) \
390 DECLARE_INTERRUPT(31) \
391 DECLARE_INTERRUPT(32) \
392 DECLARE_INTERRUPT(33) \
393 DECLARE_INTERRUPT(34) \
394 DECLARE_INTERRUPT(35) \
395 DECLARE_INTERRUPT(36) \
396 DECLARE_INTERRUPT(37) \
397 DECLARE_INTERRUPT(38) \
398 DECLARE_INTERRUPT(39) \
399 DECLARE_INTERRUPT(40) \
400 DECLARE_INTERRUPT(41) \
401 DECLARE_INTERRUPT(42) \
402 DECLARE_INTERRUPT(43) \
403 DECLARE_INTERRUPT(44) \
404 DECLARE_INTERRUPT(45) \
405 DECLARE_INTERRUPT(46) \
406 DECLARE_INTERRUPT(47) \
407 DECLARE_INTERRUPT(48) \
408 DECLARE_INTERRUPT(49) \
409 DECLARE_INTERRUPT(50) \
410 DECLARE_INTERRUPT(51) \
411 DECLARE_INTERRUPT(52) \
412 DECLARE_INTERRUPT(53) \
413 DECLARE_INTERRUPT(54) \
414 DECLARE_INTERRUPT(55) \
415 DECLARE_INTERRUPT(56) \
416 DECLARE_INTERRUPT(57) \
417 DECLARE_INTERRUPT(58) \
418 DECLARE_INTERRUPT(59) \
419 DECLARE_INTERRUPT(60) \
420 DECLARE_INTERRUPT(61) \
421 DECLARE_INTERRUPT(62) \
422 DECLARE_INTERRUPT(63) \
423 DECLARE_INTERRUPT(64) \
424 DECLARE_INTERRUPT(65) \
425 DECLARE_INTERRUPT(66) \
426 DECLARE_INTERRUPT(67) \
427 DECLARE_INTERRUPT(68) \
428 DECLARE_INTERRUPT(69) \
429 DECLARE_INTERRUPT(70) \
430 DECLARE_INTERRUPT(71) \
431 DECLARE_INTERRUPT(72) \
432 DECLARE_INTERRUPT(73) \
433 DECLARE_INTERRUPT(74) \
434 DECLARE_INTERRUPT(75) \
435 DECLARE_INTERRUPT(76) \
436 DECLARE_INTERRUPT(77) \
437 DECLARE_INTERRUPT(78) \
438 DECLARE_INTERRUPT(79) \
439 DECLARE_INTERRUPT(80) \
440 DECLARE_INTERRUPT(81) \
441 DECLARE_INTERRUPT(82) \
442 DECLARE_INTERRUPT(83) \
443 DECLARE_INTERRUPT(84) \
444 DECLARE_INTERRUPT(85) \
445 DECLARE_INTERRUPT(86) \
446 DECLARE_INTERRUPT(87) \
447 DECLARE_INTERRUPT(88) \
448 DECLARE_INTERRUPT(89) \
449 DECLARE_INTERRUPT(90) \
450 DECLARE_INTERRUPT(91) \
451 DECLARE_INTERRUPT(92) \
452 DECLARE_INTERRUPT(93) \
453 DECLARE_INTERRUPT(94) \
454 DECLARE_INTERRUPT(95) \
455 DECLARE_INTERRUPT(97) \
456 DECLARE_INTERRUPT(96) \
457 DECLARE_INTERRUPT(98) \
458 DECLARE_INTERRUPT(99) \
459 DECLARE_INTERRUPT(100) \
460 DECLARE_INTERRUPT(101) \
461 DECLARE_INTERRUPT(102) \
462 DECLARE_INTERRUPT(103) \
463 DECLARE_INTERRUPT(104) \
464 DECLARE_INTERRUPT(105) \
465 DECLARE_INTERRUPT(106) \
466 DECLARE_INTERRUPT(107) \
467 DECLARE_INTERRUPT(108) \
468 DECLARE_INTERRUPT(109) \
469 DECLARE_INTERRUPT(110) \
470 DECLARE_INTERRUPT(111) \
471 DECLARE_INTERRUPT(112) \
472 DECLARE_INTERRUPT(113) \
473 DECLARE_INTERRUPT(114) \
474 DECLARE_INTERRUPT(115) \
475 DECLARE_INTERRUPT(116) \
476 DECLARE_INTERRUPT(117) \
477 DECLARE_INTERRUPT(118) \
478 DECLARE_INTERRUPT(119) \
479 DECLARE_INTERRUPT(120) \
480 DECLARE_INTERRUPT(121) \
481 DECLARE_INTERRUPT(122) \
482 DECLARE_INTERRUPT(123) \
483 DECLARE_INTERRUPT(124) \
484 DECLARE_INTERRUPT(125) \
485 DECLARE_INTERRUPT(126) \
486 DECLARE_INTERRUPT(127) \
487 DECLARE_INTERRUPT(128) \
488 DECLARE_INTERRUPT(129) \
489 DECLARE_INTERRUPT(130) \
490 DECLARE_INTERRUPT(131) \
491 DECLARE_INTERRUPT(132) \
492 DECLARE_INTERRUPT(133) \
493 DECLARE_INTERRUPT(134) \
494 DECLARE_INTERRUPT(135) \
495 DECLARE_INTERRUPT(136) \
496 DECLARE_INTERRUPT(137) \
497 DECLARE_INTERRUPT(138) \
498 DECLARE_INTERRUPT(139) \
499 DECLARE_INTERRUPT(140) \
500 DECLARE_INTERRUPT(141) \
501 DECLARE_INTERRUPT(142) \
502 DECLARE_INTERRUPT(143) \
503 DECLARE_INTERRUPT(144) \
504 DECLARE_INTERRUPT(145) \
505 DECLARE_INTERRUPT(146) \
506 DECLARE_INTERRUPT(147) \
507 DECLARE_INTERRUPT(148) \
508 DECLARE_INTERRUPT(149) \
509 DECLARE_INTERRUPT(150) \
510 DECLARE_INTERRUPT(151) \
511 DECLARE_INTERRUPT(152) \
512 DECLARE_INTERRUPT(153) \
513 DECLARE_INTERRUPT(154) \
514 DECLARE_INTERRUPT(155) \
515 DECLARE_INTERRUPT(156) \
516 DECLARE_INTERRUPT(157) \
517 DECLARE_INTERRUPT(158) \
518 DECLARE_INTERRUPT(159) \
519 DECLARE_INTERRUPT(160) \
520 DECLARE_INTERRUPT(161) \
521 DECLARE_INTERRUPT(162) \
522 DECLARE_INTERRUPT(163) \
523 DECLARE_INTERRUPT(164) \
524 DECLARE_INTERRUPT(165) \
525 DECLARE_INTERRUPT(166) \
526 DECLARE_INTERRUPT(167) \
527 DECLARE_INTERRUPT(168) \
528 DECLARE_INTERRUPT(169) \
529 DECLARE_INTERRUPT(170) \
530 DECLARE_INTERRUPT(171) \
531 DECLARE_INTERRUPT(172) \
532 DECLARE_INTERRUPT(173) \
533 DECLARE_INTERRUPT(174) \
534 DECLARE_INTERRUPT(175) \
535 DECLARE_INTERRUPT(176) \
536 DECLARE_INTERRUPT(177) \
537 DECLARE_INTERRUPT(178) \
538 DECLARE_INTERRUPT(179) \
539 DECLARE_INTERRUPT(180) \
540 DECLARE_INTERRUPT(181) \
541 DECLARE_INTERRUPT(182) \
542 DECLARE_INTERRUPT(183) \
543 DECLARE_INTERRUPT(184) \
544 DECLARE_INTERRUPT(185) \
545 DECLARE_INTERRUPT(186) \
546 DECLARE_INTERRUPT(187) \
547 DECLARE_INTERRUPT(188) \
548 DECLARE_INTERRUPT(189) \
549 DECLARE_INTERRUPT(190) \
550 DECLARE_INTERRUPT(191) \
551 DECLARE_INTERRUPT(192) \
552 DECLARE_INTERRUPT(193) \
553 DECLARE_INTERRUPT(194) \
554 DECLARE_INTERRUPT(195) \
555 DECLARE_INTERRUPT(196) \
556 DECLARE_INTERRUPT(197) \
557 DECLARE_INTERRUPT(198) \
558 DECLARE_INTERRUPT(199) \
559 DECLARE_INTERRUPT(200) \
560 DECLARE_INTERRUPT(201) \
561 DECLARE_INTERRUPT(202) \
562 DECLARE_INTERRUPT(203) \
563 DECLARE_INTERRUPT(204) \
564 DECLARE_INTERRUPT(205) \
565 DECLARE_INTERRUPT(206) \
566 DECLARE_INTERRUPT(207) \
567 DECLARE_INTERRUPT(208) \
568 DECLARE_INTERRUPT(209) \
569 DECLARE_INTERRUPT(210) \
570 DECLARE_INTERRUPT(211) \
571 DECLARE_INTERRUPT(212) \
572 DECLARE_INTERRUPT(213) \
573 DECLARE_INTERRUPT(214) \
574 DECLARE_INTERRUPT(215) \
575 DECLARE_INTERRUPT(216) \
576 DECLARE_INTERRUPT(217) \
577 DECLARE_INTERRUPT(218) \
578 DECLARE_INTERRUPT(219) \
579 DECLARE_INTERRUPT(220) \
580 DECLARE_INTERRUPT(221) \
581 DECLARE_INTERRUPT(222) \
582 DECLARE_INTERRUPT(223) \
583 DECLARE_INTERRUPT(224) \
584 DECLARE_INTERRUPT(225) \
585 DECLARE_INTERRUPT(226) \
586 DECLARE_INTERRUPT(227) \
587 DECLARE_INTERRUPT(228) \
588 DECLARE_INTERRUPT(229) \
589 DECLARE_INTERRUPT(230) \
590 DECLARE_INTERRUPT(231) \
591 DECLARE_INTERRUPT(232) \
592 DECLARE_INTERRUPT(233) \
593 DECLARE_INTERRUPT(234) \
594 DECLARE_INTERRUPT(235) \
595 DECLARE_INTERRUPT(236) \
596 DECLARE_INTERRUPT(237) \
597 DECLARE_INTERRUPT(238) \
598 DECLARE_INTERRUPT(239) \
599 DECLARE_INTERRUPT(240) \
600 DECLARE_INTERRUPT(241) \
601 DECLARE_INTERRUPT(242) \
602 DECLARE_INTERRUPT(243) \
603 DECLARE_INTERRUPT(244) \
604 DECLARE_INTERRUPT(245) \
605 DECLARE_INTERRUPT(246) \
606 DECLARE_INTERRUPT(247) \
607 DECLARE_INTERRUPT(248) \
608 DECLARE_INTERRUPT(249) \
609 DECLARE_INTERRUPT(250) \
610 DECLARE_INTERRUPT(251) \
611 DECLARE_INTERRUPT(252) \
612 DECLARE_INTERRUPT(253) \
613 DECLARE_INTERRUPT(254) \
614 DECLARE_INTERRUPT(255));
615