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d8ed9d48 TG |
1 | /* |
2 | * Interrupt descriptor table related code | |
3 | * | |
4 | * This file is licensed under the GPL V2 | |
5 | */ | |
6 | #include <linux/interrupt.h> | |
7 | ||
3318e974 TG |
8 | #include <asm/traps.h> |
9 | #include <asm/proto.h> | |
d8ed9d48 TG |
10 | #include <asm/desc.h> |
11 | ||
3318e974 TG |
12 | struct idt_data { |
13 | unsigned int vector; | |
14 | unsigned int segment; | |
15 | struct idt_bits bits; | |
16 | const void *addr; | |
17 | }; | |
18 | ||
19 | #define DPL0 0x0 | |
20 | #define DPL3 0x3 | |
21 | ||
22 | #define DEFAULT_STACK 0 | |
23 | ||
24 | #define G(_vector, _addr, _ist, _type, _dpl, _segment) \ | |
25 | { \ | |
26 | .vector = _vector, \ | |
27 | .bits.ist = _ist, \ | |
28 | .bits.type = _type, \ | |
29 | .bits.dpl = _dpl, \ | |
30 | .bits.p = 1, \ | |
31 | .addr = _addr, \ | |
32 | .segment = _segment, \ | |
33 | } | |
34 | ||
35 | /* Interrupt gate */ | |
36 | #define INTG(_vector, _addr) \ | |
37 | G(_vector, _addr, DEFAULT_STACK, GATE_INTERRUPT, DPL0, __KERNEL_CS) | |
38 | ||
39 | /* System interrupt gate */ | |
40 | #define SYSG(_vector, _addr) \ | |
41 | G(_vector, _addr, DEFAULT_STACK, GATE_INTERRUPT, DPL3, __KERNEL_CS) | |
42 | ||
43 | /* Interrupt gate with interrupt stack */ | |
44 | #define ISTG(_vector, _addr, _ist) \ | |
45 | G(_vector, _addr, _ist, GATE_INTERRUPT, DPL0, __KERNEL_CS) | |
46 | ||
47 | /* Task gate */ | |
48 | #define TSKG(_vector, _gdt) \ | |
49 | G(_vector, NULL, DEFAULT_STACK, GATE_TASK, DPL0, _gdt << 3) | |
50 | ||
433f8924 TG |
51 | /* |
52 | * Early traps running on the DEFAULT_STACK because the other interrupt | |
53 | * stacks work only after cpu_init(). | |
54 | */ | |
55 | static const __initdata struct idt_data early_idts[] = { | |
56 | INTG(X86_TRAP_DB, debug), | |
57 | SYSG(X86_TRAP_BP, int3), | |
58 | #ifdef CONFIG_X86_32 | |
59 | INTG(X86_TRAP_PF, page_fault), | |
60 | #endif | |
61 | }; | |
62 | ||
b70543a0 TG |
63 | /* |
64 | * The default IDT entries which are set up in trap_init() before | |
65 | * cpu_init() is invoked. Interrupt stacks cannot be used at that point and | |
66 | * the traps which use them are reinitialized with IST after cpu_init() has | |
67 | * set up TSS. | |
68 | */ | |
69 | static const __initdata struct idt_data def_idts[] = { | |
70 | INTG(X86_TRAP_DE, divide_error), | |
71 | INTG(X86_TRAP_NMI, nmi), | |
72 | INTG(X86_TRAP_BR, bounds), | |
73 | INTG(X86_TRAP_UD, invalid_op), | |
74 | INTG(X86_TRAP_NM, device_not_available), | |
75 | INTG(X86_TRAP_OLD_MF, coprocessor_segment_overrun), | |
76 | INTG(X86_TRAP_TS, invalid_TSS), | |
77 | INTG(X86_TRAP_NP, segment_not_present), | |
78 | INTG(X86_TRAP_SS, stack_segment), | |
79 | INTG(X86_TRAP_GP, general_protection), | |
80 | INTG(X86_TRAP_SPURIOUS, spurious_interrupt_bug), | |
81 | INTG(X86_TRAP_MF, coprocessor_error), | |
82 | INTG(X86_TRAP_AC, alignment_check), | |
83 | INTG(X86_TRAP_XF, simd_coprocessor_error), | |
84 | ||
85 | #ifdef CONFIG_X86_32 | |
86 | TSKG(X86_TRAP_DF, GDT_ENTRY_DOUBLEFAULT_TSS), | |
87 | #else | |
88 | INTG(X86_TRAP_DF, double_fault), | |
89 | #endif | |
90 | INTG(X86_TRAP_DB, debug), | |
91 | INTG(X86_TRAP_NMI, nmi), | |
92 | INTG(X86_TRAP_BP, int3), | |
93 | ||
94 | #ifdef CONFIG_X86_MCE | |
95 | INTG(X86_TRAP_MC, &machine_check), | |
96 | #endif | |
97 | ||
98 | SYSG(X86_TRAP_OF, overflow), | |
99 | #if defined(CONFIG_IA32_EMULATION) | |
100 | SYSG(IA32_SYSCALL_VECTOR, entry_INT80_compat), | |
101 | #elif defined(CONFIG_X86_32) | |
102 | SYSG(IA32_SYSCALL_VECTOR, entry_INT80_32), | |
103 | #endif | |
104 | }; | |
105 | ||
636a7598 TG |
106 | /* |
107 | * The APIC and SMP idt entries | |
108 | */ | |
109 | static const __initdata struct idt_data apic_idts[] = { | |
110 | #ifdef CONFIG_SMP | |
111 | INTG(RESCHEDULE_VECTOR, reschedule_interrupt), | |
112 | INTG(CALL_FUNCTION_VECTOR, call_function_interrupt), | |
113 | INTG(CALL_FUNCTION_SINGLE_VECTOR, call_function_single_interrupt), | |
114 | INTG(IRQ_MOVE_CLEANUP_VECTOR, irq_move_cleanup_interrupt), | |
115 | INTG(REBOOT_VECTOR, reboot_interrupt), | |
116 | #endif | |
117 | ||
118 | #ifdef CONFIG_X86_THERMAL_VECTOR | |
119 | INTG(THERMAL_APIC_VECTOR, thermal_interrupt), | |
120 | #endif | |
121 | ||
122 | #ifdef CONFIG_X86_MCE_THRESHOLD | |
123 | INTG(THRESHOLD_APIC_VECTOR, threshold_interrupt), | |
124 | #endif | |
125 | ||
126 | #ifdef CONFIG_X86_MCE_AMD | |
127 | INTG(DEFERRED_ERROR_VECTOR, deferred_error_interrupt), | |
128 | #endif | |
129 | ||
130 | #ifdef CONFIG_X86_LOCAL_APIC | |
131 | INTG(LOCAL_TIMER_VECTOR, apic_timer_interrupt), | |
132 | INTG(X86_PLATFORM_IPI_VECTOR, x86_platform_ipi), | |
133 | # ifdef CONFIG_HAVE_KVM | |
134 | INTG(POSTED_INTR_VECTOR, kvm_posted_intr_ipi), | |
135 | INTG(POSTED_INTR_WAKEUP_VECTOR, kvm_posted_intr_wakeup_ipi), | |
136 | INTG(POSTED_INTR_NESTED_VECTOR, kvm_posted_intr_nested_ipi), | |
137 | # endif | |
138 | # ifdef CONFIG_IRQ_WORK | |
139 | INTG(IRQ_WORK_VECTOR, irq_work_interrupt), | |
140 | # endif | |
141 | INTG(SPURIOUS_APIC_VECTOR, spurious_interrupt), | |
142 | INTG(ERROR_APIC_VECTOR, error_interrupt), | |
143 | #endif | |
144 | }; | |
145 | ||
433f8924 TG |
146 | #ifdef CONFIG_X86_64 |
147 | /* | |
148 | * Early traps running on the DEFAULT_STACK because the other interrupt | |
149 | * stacks work only after cpu_init(). | |
150 | */ | |
151 | static const __initdata struct idt_data early_pf_idts[] = { | |
152 | INTG(X86_TRAP_PF, page_fault), | |
153 | }; | |
0a30908b TG |
154 | |
155 | /* | |
156 | * Override for the debug_idt. Same as the default, but with interrupt | |
157 | * stack set to DEFAULT_STACK (0). Required for NMI trap handling. | |
158 | */ | |
159 | static const __initdata struct idt_data dbg_idts[] = { | |
160 | INTG(X86_TRAP_DB, debug), | |
161 | INTG(X86_TRAP_BP, int3), | |
162 | }; | |
433f8924 TG |
163 | #endif |
164 | ||
d8ed9d48 TG |
165 | /* Must be page-aligned because the real IDT is used in a fixmap. */ |
166 | gate_desc idt_table[IDT_ENTRIES] __page_aligned_bss; | |
167 | ||
d8ed9d48 | 168 | struct desc_ptr idt_descr __ro_after_init = { |
16bc18d8 | 169 | .size = (IDT_ENTRIES * 2 * sizeof(unsigned long)) - 1, |
d8ed9d48 TG |
170 | .address = (unsigned long) idt_table, |
171 | }; | |
172 | ||
16bc18d8 TG |
173 | #ifdef CONFIG_X86_64 |
174 | /* No need to be aligned, but done to keep all IDTs defined the same way. */ | |
175 | gate_desc debug_idt_table[IDT_ENTRIES] __page_aligned_bss; | |
176 | ||
90f6225f TG |
177 | /* |
178 | * The exceptions which use Interrupt stacks. They are setup after | |
179 | * cpu_init() when the TSS has been initialized. | |
180 | */ | |
181 | static const __initdata struct idt_data ist_idts[] = { | |
182 | ISTG(X86_TRAP_DB, debug, DEBUG_STACK), | |
183 | ISTG(X86_TRAP_NMI, nmi, NMI_STACK), | |
184 | ISTG(X86_TRAP_BP, int3, DEBUG_STACK), | |
185 | ISTG(X86_TRAP_DF, double_fault, DOUBLEFAULT_STACK), | |
186 | #ifdef CONFIG_X86_MCE | |
187 | ISTG(X86_TRAP_MC, &machine_check, MCE_STACK), | |
188 | #endif | |
189 | }; | |
190 | ||
0a30908b TG |
191 | /* |
192 | * Override for the debug_idt. Same as the default, but with interrupt | |
193 | * stack set to DEFAULT_STACK (0). Required for NMI trap handling. | |
194 | */ | |
d8ed9d48 TG |
195 | const struct desc_ptr debug_idt_descr = { |
196 | .size = IDT_ENTRIES * 16 - 1, | |
197 | .address = (unsigned long) debug_idt_table, | |
198 | }; | |
199 | #endif | |
e802a51e | 200 | |
3318e974 TG |
201 | static inline void idt_init_desc(gate_desc *gate, const struct idt_data *d) |
202 | { | |
203 | unsigned long addr = (unsigned long) d->addr; | |
204 | ||
205 | gate->offset_low = (u16) addr; | |
206 | gate->segment = (u16) d->segment; | |
207 | gate->bits = d->bits; | |
208 | gate->offset_middle = (u16) (addr >> 16); | |
209 | #ifdef CONFIG_X86_64 | |
210 | gate->offset_high = (u32) (addr >> 32); | |
211 | gate->reserved = 0; | |
212 | #endif | |
213 | } | |
214 | ||
db18da78 TG |
215 | static void |
216 | idt_setup_from_table(gate_desc *idt, const struct idt_data *t, int size, bool sys) | |
3318e974 TG |
217 | { |
218 | gate_desc desc; | |
219 | ||
220 | for (; size > 0; t++, size--) { | |
221 | idt_init_desc(&desc, t); | |
3318e974 | 222 | write_idt_entry(idt, t->vector, &desc); |
db18da78 TG |
223 | if (sys) |
224 | set_bit(t->vector, used_vectors); | |
3318e974 TG |
225 | } |
226 | } | |
227 | ||
facaa3e3 TG |
228 | static void set_intr_gate(unsigned int n, const void *addr) |
229 | { | |
230 | struct idt_data data; | |
231 | ||
232 | BUG_ON(n > 0xFF); | |
233 | ||
234 | memset(&data, 0, sizeof(data)); | |
235 | data.vector = n; | |
236 | data.addr = addr; | |
237 | data.segment = __KERNEL_CS; | |
238 | data.bits.type = GATE_INTERRUPT; | |
239 | data.bits.p = 1; | |
240 | ||
241 | idt_setup_from_table(idt_table, &data, 1, false); | |
242 | } | |
243 | ||
433f8924 TG |
244 | /** |
245 | * idt_setup_early_traps - Initialize the idt table with early traps | |
246 | * | |
247 | * On X8664 these traps do not use interrupt stacks as they can't work | |
248 | * before cpu_init() is invoked and sets up TSS. The IST variants are | |
249 | * installed after that. | |
250 | */ | |
251 | void __init idt_setup_early_traps(void) | |
252 | { | |
db18da78 TG |
253 | idt_setup_from_table(idt_table, early_idts, ARRAY_SIZE(early_idts), |
254 | true); | |
433f8924 TG |
255 | load_idt(&idt_descr); |
256 | } | |
257 | ||
b70543a0 TG |
258 | /** |
259 | * idt_setup_traps - Initialize the idt table with default traps | |
260 | */ | |
261 | void __init idt_setup_traps(void) | |
262 | { | |
db18da78 | 263 | idt_setup_from_table(idt_table, def_idts, ARRAY_SIZE(def_idts), true); |
b70543a0 TG |
264 | } |
265 | ||
433f8924 TG |
266 | #ifdef CONFIG_X86_64 |
267 | /** | |
268 | * idt_setup_early_pf - Initialize the idt table with early pagefault handler | |
269 | * | |
270 | * On X8664 this does not use interrupt stacks as they can't work before | |
271 | * cpu_init() is invoked and sets up TSS. The IST variant is installed | |
272 | * after that. | |
273 | * | |
274 | * FIXME: Why is 32bit and 64bit installing the PF handler at different | |
275 | * places in the early setup code? | |
276 | */ | |
277 | void __init idt_setup_early_pf(void) | |
278 | { | |
279 | idt_setup_from_table(idt_table, early_pf_idts, | |
db18da78 | 280 | ARRAY_SIZE(early_pf_idts), true); |
433f8924 | 281 | } |
0a30908b | 282 | |
90f6225f TG |
283 | /** |
284 | * idt_setup_ist_traps - Initialize the idt table with traps using IST | |
285 | */ | |
286 | void __init idt_setup_ist_traps(void) | |
287 | { | |
db18da78 | 288 | idt_setup_from_table(idt_table, ist_idts, ARRAY_SIZE(ist_idts), true); |
90f6225f TG |
289 | } |
290 | ||
0a30908b TG |
291 | /** |
292 | * idt_setup_debugidt_traps - Initialize the debug idt table with debug traps | |
293 | */ | |
294 | void __init idt_setup_debugidt_traps(void) | |
295 | { | |
296 | memcpy(&debug_idt_table, &idt_table, IDT_ENTRIES * 16); | |
297 | ||
db18da78 | 298 | idt_setup_from_table(debug_idt_table, dbg_idts, ARRAY_SIZE(dbg_idts), false); |
0a30908b | 299 | } |
433f8924 TG |
300 | #endif |
301 | ||
636a7598 TG |
302 | /** |
303 | * idt_setup_apic_and_irq_gates - Setup APIC/SMP and normal interrupt gates | |
304 | */ | |
305 | void __init idt_setup_apic_and_irq_gates(void) | |
306 | { | |
dc20b2d5 TG |
307 | int i = FIRST_EXTERNAL_VECTOR; |
308 | void *entry; | |
309 | ||
db18da78 | 310 | idt_setup_from_table(idt_table, apic_idts, ARRAY_SIZE(apic_idts), true); |
dc20b2d5 TG |
311 | |
312 | for_each_clear_bit_from(i, used_vectors, FIRST_SYSTEM_VECTOR) { | |
313 | entry = irq_entries_start + 8 * (i - FIRST_EXTERNAL_VECTOR); | |
314 | set_intr_gate(i, entry); | |
315 | } | |
316 | ||
317 | for_each_clear_bit_from(i, used_vectors, NR_VECTORS) { | |
318 | #ifdef CONFIG_X86_LOCAL_APIC | |
319 | set_bit(i, used_vectors); | |
320 | set_intr_gate(i, spurious_interrupt); | |
321 | #else | |
322 | entry = irq_entries_start + 8 * (i - FIRST_EXTERNAL_VECTOR); | |
323 | set_intr_gate(i, entry); | |
324 | #endif | |
325 | } | |
636a7598 TG |
326 | } |
327 | ||
588787fd TG |
328 | /** |
329 | * idt_setup_early_handler - Initializes the idt table with early handlers | |
330 | */ | |
331 | void __init idt_setup_early_handler(void) | |
332 | { | |
333 | int i; | |
334 | ||
335 | for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) | |
336 | set_intr_gate(i, early_idt_handler_array[i]); | |
87e81786 TG |
337 | #ifdef CONFIG_X86_32 |
338 | for ( ; i < NR_VECTORS; i++) | |
339 | set_intr_gate(i, early_ignore_irq); | |
340 | #endif | |
588787fd TG |
341 | load_idt(&idt_descr); |
342 | } | |
343 | ||
e802a51e TG |
344 | /** |
345 | * idt_invalidate - Invalidate interrupt descriptor table | |
346 | * @addr: The virtual address of the 'invalid' IDT | |
347 | */ | |
348 | void idt_invalidate(void *addr) | |
349 | { | |
350 | struct desc_ptr idt = { .address = (unsigned long) addr, .size = 0 }; | |
351 | ||
352 | load_idt(&idt); | |
353 | } | |
db18da78 | 354 | |
facaa3e3 | 355 | void __init update_intr_gate(unsigned int n, const void *addr) |
db18da78 | 356 | { |
facaa3e3 TG |
357 | if (WARN_ON_ONCE(!test_bit(n, used_vectors))) |
358 | return; | |
359 | set_intr_gate(n, addr); | |
db18da78 TG |
360 | } |
361 | ||
362 | void alloc_intr_gate(unsigned int n, const void *addr) | |
363 | { | |
4447ac11 TG |
364 | BUG_ON(n < FIRST_SYSTEM_VECTOR); |
365 | if (!test_and_set_bit(n, used_vectors)) | |
366 | set_intr_gate(n, addr); | |
db18da78 | 367 | } |