1 #include <linux/linkage.h>
2 #include <linux/errno.h>
3 #include <linux/signal.h>
4 #include <linux/sched.h>
5 #include <linux/ioport.h>
6 #include <linux/interrupt.h>
7 #include <linux/timex.h>
8 #include <linux/random.h>
9 #include <linux/kprobes.h>
10 #include <linux/init.h>
11 #include <linux/kernel_stat.h>
12 #include <linux/device.h>
13 #include <linux/bitops.h>
14 #include <linux/acpi.h>
15 #include <linux/io.h>
16 #include <linux/delay.h>
17
18 #include <linux/atomic.h>
19 #include <asm/timer.h>
20 #include <asm/hw_irq.h>
21 #include <asm/pgtable.h>
22 #include <asm/desc.h>
23 #include <asm/apic.h>
24 #include <asm/setup.h>
25 #include <asm/i8259.h>
26 #include <asm/traps.h>
27 #include <asm/prom.h>
28
29 /*
30 * ISA PIC or low IO-APIC triggered (INTA-cycle or APIC) interrupts:
31 * (these are usually mapped to vectors 0x30-0x3f)
32 */
33
34 /*
35 * The IO-APIC gives us many more interrupt sources. Most of these
36 * are unused but an SMP system is supposed to have enough memory ...
37 * sometimes (mostly wrt. hw bugs) we get corrupted vectors all
38 * across the spectrum, so we really want to be prepared to get all
39 * of these. Plus, more powerful systems might have more than 64
40 * IO-APIC registers.
41 *
42 * (these are usually mapped into the 0x30-0xff vector range)
43 */
44
45 #ifdef CONFIG_X86_32
46 /*
47 * Note that on a 486, we don't want to do a SIGFPE on an irq13
48 * as the irq is unreliable, and exception 16 works correctly
49 * (ie as explained in the intel literature). On a 386, you
50 * can't use exception 16 due to bad IBM design, so we have to
51 * rely on the less exact irq13.
52 *
53 * Careful.. Not only is IRQ13 unreliable, but it is also
54 * leads to races. IBM designers who came up with it should
55 * be shot.
56 */
57
math_error_irq(int cpl,void * dev_id)58 static irqreturn_t math_error_irq(int cpl, void *dev_id)
59 {
60 outb(0, 0xF0);
61 if (ignore_fpu_irq || !boot_cpu_data.hard_math)
62 return IRQ_NONE;
63 math_error(get_irq_regs(), 0, X86_TRAP_MF);
64 return IRQ_HANDLED;
65 }
66
67 /*
68 * New motherboards sometimes make IRQ 13 be a PCI interrupt,
69 * so allow interrupt sharing.
70 */
71 static struct irqaction fpu_irq = {
72 .handler = math_error_irq,
73 .name = "fpu",
74 .flags = IRQF_NO_THREAD,
75 };
76 #endif
77
78 /*
79 * IRQ2 is cascade interrupt to second interrupt controller
80 */
81 static struct irqaction irq2 = {
82 .handler = no_action,
83 .name = "cascade",
84 .flags = IRQF_NO_THREAD,
85 };
86
87 DEFINE_PER_CPU(vector_irq_t, vector_irq) = {
88 [0 ... NR_VECTORS - 1] = -1,
89 };
90
vector_used_by_percpu_irq(unsigned int vector)91 int vector_used_by_percpu_irq(unsigned int vector)
92 {
93 int cpu;
94
95 for_each_online_cpu(cpu) {
96 if (per_cpu(vector_irq, cpu)[vector] != -1)
97 return 1;
98 }
99
100 return 0;
101 }
102
init_ISA_irqs(void)103 void __init init_ISA_irqs(void)
104 {
105 struct irq_chip *chip = legacy_pic->chip;
106 const char *name = chip->name;
107 int i;
108
109 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_LOCAL_APIC)
110 init_bsp_APIC();
111 #endif
112 legacy_pic->init(0);
113
114 for (i = 0; i < legacy_pic->nr_legacy_irqs; i++)
115 irq_set_chip_and_handler_name(i, chip, handle_level_irq, name);
116 }
117
init_IRQ(void)118 void __init init_IRQ(void)
119 {
120 int i;
121
122 /*
123 * We probably need a better place for this, but it works for
124 * now ...
125 */
126 x86_add_irq_domains();
127
128 /*
129 * On cpu 0, Assign IRQ0_VECTOR..IRQ15_VECTOR's to IRQ 0..15.
130 * If these IRQ's are handled by legacy interrupt-controllers like PIC,
131 * then this configuration will likely be static after the boot. If
132 * these IRQ's are handled by more mordern controllers like IO-APIC,
133 * then this vector space can be freed and re-used dynamically as the
134 * irq's migrate etc.
135 */
136 for (i = 0; i < legacy_pic->nr_legacy_irqs; i++)
137 per_cpu(vector_irq, 0)[IRQ0_VECTOR + i] = i;
138
139 x86_init.irqs.intr_init();
140 }
141
142 /*
143 * Setup the vector to irq mappings.
144 */
setup_vector_irq(int cpu)145 void setup_vector_irq(int cpu)
146 {
147 #ifndef CONFIG_X86_IO_APIC
148 int irq;
149
150 /*
151 * On most of the platforms, legacy PIC delivers the interrupts on the
152 * boot cpu. But there are certain platforms where PIC interrupts are
153 * delivered to multiple cpu's. If the legacy IRQ is handled by the
154 * legacy PIC, for the new cpu that is coming online, setup the static
155 * legacy vector to irq mapping:
156 */
157 for (irq = 0; irq < legacy_pic->nr_legacy_irqs; irq++)
158 per_cpu(vector_irq, cpu)[IRQ0_VECTOR + irq] = irq;
159 #endif
160
161 __setup_vector_irq(cpu);
162 }
163
smp_intr_init(void)164 static void __init smp_intr_init(void)
165 {
166 #ifdef CONFIG_SMP
167 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_LOCAL_APIC)
168 /*
169 * The reschedule interrupt is a CPU-to-CPU reschedule-helper
170 * IPI, driven by wakeup.
171 */
172 alloc_intr_gate(RESCHEDULE_VECTOR, reschedule_interrupt);
173
174 /* IPIs for invalidation */
175 #define ALLOC_INVTLB_VEC(NR) \
176 alloc_intr_gate(INVALIDATE_TLB_VECTOR_START+NR, \
177 invalidate_interrupt##NR)
178
179 switch (NUM_INVALIDATE_TLB_VECTORS) {
180 default:
181 ALLOC_INVTLB_VEC(31);
182 case 31:
183 ALLOC_INVTLB_VEC(30);
184 case 30:
185 ALLOC_INVTLB_VEC(29);
186 case 29:
187 ALLOC_INVTLB_VEC(28);
188 case 28:
189 ALLOC_INVTLB_VEC(27);
190 case 27:
191 ALLOC_INVTLB_VEC(26);
192 case 26:
193 ALLOC_INVTLB_VEC(25);
194 case 25:
195 ALLOC_INVTLB_VEC(24);
196 case 24:
197 ALLOC_INVTLB_VEC(23);
198 case 23:
199 ALLOC_INVTLB_VEC(22);
200 case 22:
201 ALLOC_INVTLB_VEC(21);
202 case 21:
203 ALLOC_INVTLB_VEC(20);
204 case 20:
205 ALLOC_INVTLB_VEC(19);
206 case 19:
207 ALLOC_INVTLB_VEC(18);
208 case 18:
209 ALLOC_INVTLB_VEC(17);
210 case 17:
211 ALLOC_INVTLB_VEC(16);
212 case 16:
213 ALLOC_INVTLB_VEC(15);
214 case 15:
215 ALLOC_INVTLB_VEC(14);
216 case 14:
217 ALLOC_INVTLB_VEC(13);
218 case 13:
219 ALLOC_INVTLB_VEC(12);
220 case 12:
221 ALLOC_INVTLB_VEC(11);
222 case 11:
223 ALLOC_INVTLB_VEC(10);
224 case 10:
225 ALLOC_INVTLB_VEC(9);
226 case 9:
227 ALLOC_INVTLB_VEC(8);
228 case 8:
229 ALLOC_INVTLB_VEC(7);
230 case 7:
231 ALLOC_INVTLB_VEC(6);
232 case 6:
233 ALLOC_INVTLB_VEC(5);
234 case 5:
235 ALLOC_INVTLB_VEC(4);
236 case 4:
237 ALLOC_INVTLB_VEC(3);
238 case 3:
239 ALLOC_INVTLB_VEC(2);
240 case 2:
241 ALLOC_INVTLB_VEC(1);
242 case 1:
243 ALLOC_INVTLB_VEC(0);
244 break;
245 }
246
247 /* IPI for generic function call */
248 alloc_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
249
250 /* IPI for generic single function call */
251 alloc_intr_gate(CALL_FUNCTION_SINGLE_VECTOR,
252 call_function_single_interrupt);
253
254 /* Low priority IPI to cleanup after moving an irq */
255 set_intr_gate(IRQ_MOVE_CLEANUP_VECTOR, irq_move_cleanup_interrupt);
256 set_bit(IRQ_MOVE_CLEANUP_VECTOR, used_vectors);
257
258 /* IPI used for rebooting/stopping */
259 alloc_intr_gate(REBOOT_VECTOR, reboot_interrupt);
260 #endif
261 #endif /* CONFIG_SMP */
262 }
263
apic_intr_init(void)264 static void __init apic_intr_init(void)
265 {
266 smp_intr_init();
267
268 #ifdef CONFIG_X86_THERMAL_VECTOR
269 alloc_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt);
270 #endif
271 #ifdef CONFIG_X86_MCE_THRESHOLD
272 alloc_intr_gate(THRESHOLD_APIC_VECTOR, threshold_interrupt);
273 #endif
274
275 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_LOCAL_APIC)
276 /* self generated IPI for local APIC timer */
277 alloc_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt);
278
279 /* IPI for X86 platform specific use */
280 alloc_intr_gate(X86_PLATFORM_IPI_VECTOR, x86_platform_ipi);
281
282 /* IPI vectors for APIC spurious and error interrupts */
283 alloc_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
284 alloc_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
285
286 /* IRQ work interrupts: */
287 # ifdef CONFIG_IRQ_WORK
288 alloc_intr_gate(IRQ_WORK_VECTOR, irq_work_interrupt);
289 # endif
290
291 #endif
292 }
293
native_init_IRQ(void)294 void __init native_init_IRQ(void)
295 {
296 int i;
297
298 /* Execute any quirks before the call gates are initialised: */
299 x86_init.irqs.pre_vector_init();
300
301 apic_intr_init();
302
303 /*
304 * Cover the whole vector space, no vector can escape
305 * us. (some of these will be overridden and become
306 * 'special' SMP interrupts)
307 */
308 i = FIRST_EXTERNAL_VECTOR;
309 for_each_clear_bit_from(i, used_vectors, NR_VECTORS) {
310 /* IA32_SYSCALL_VECTOR could be used in trap_init already. */
311 set_intr_gate(i, interrupt[i - FIRST_EXTERNAL_VECTOR]);
312 }
313
314 if (!acpi_ioapic && !of_ioapic)
315 setup_irq(2, &irq2);
316
317 #ifdef CONFIG_X86_32
318 /*
319 * External FPU? Set up irq13 if so, for
320 * original braindamaged IBM FERR coupling.
321 */
322 if (boot_cpu_data.hard_math && !cpu_has_fpu)
323 setup_irq(FPU_IRQ, &fpu_irq);
324
325 irq_ctx_init(smp_processor_id());
326 #endif
327 }
328