diff options
Diffstat (limited to 'arch/x86/kernel/irqinit_32.c')
-rw-r--r-- | arch/x86/kernel/irqinit_32.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/arch/x86/kernel/irqinit_32.c b/arch/x86/kernel/irqinit_32.c new file mode 100644 index 000000000000..d66914287ee1 --- /dev/null +++ b/arch/x86/kernel/irqinit_32.c | |||
@@ -0,0 +1,114 @@ | |||
1 | #include <linux/errno.h> | ||
2 | #include <linux/signal.h> | ||
3 | #include <linux/sched.h> | ||
4 | #include <linux/ioport.h> | ||
5 | #include <linux/interrupt.h> | ||
6 | #include <linux/slab.h> | ||
7 | #include <linux/random.h> | ||
8 | #include <linux/init.h> | ||
9 | #include <linux/kernel_stat.h> | ||
10 | #include <linux/sysdev.h> | ||
11 | #include <linux/bitops.h> | ||
12 | |||
13 | #include <asm/atomic.h> | ||
14 | #include <asm/system.h> | ||
15 | #include <asm/io.h> | ||
16 | #include <asm/timer.h> | ||
17 | #include <asm/pgtable.h> | ||
18 | #include <asm/delay.h> | ||
19 | #include <asm/desc.h> | ||
20 | #include <asm/apic.h> | ||
21 | #include <asm/arch_hooks.h> | ||
22 | #include <asm/i8259.h> | ||
23 | |||
24 | |||
25 | |||
26 | /* | ||
27 | * Note that on a 486, we don't want to do a SIGFPE on an irq13 | ||
28 | * as the irq is unreliable, and exception 16 works correctly | ||
29 | * (ie as explained in the intel literature). On a 386, you | ||
30 | * can't use exception 16 due to bad IBM design, so we have to | ||
31 | * rely on the less exact irq13. | ||
32 | * | ||
33 | * Careful.. Not only is IRQ13 unreliable, but it is also | ||
34 | * leads to races. IBM designers who came up with it should | ||
35 | * be shot. | ||
36 | */ | ||
37 | |||
38 | |||
39 | static irqreturn_t math_error_irq(int cpl, void *dev_id) | ||
40 | { | ||
41 | extern void math_error(void __user *); | ||
42 | outb(0,0xF0); | ||
43 | if (ignore_fpu_irq || !boot_cpu_data.hard_math) | ||
44 | return IRQ_NONE; | ||
45 | math_error((void __user *)get_irq_regs()->ip); | ||
46 | return IRQ_HANDLED; | ||
47 | } | ||
48 | |||
49 | /* | ||
50 | * New motherboards sometimes make IRQ 13 be a PCI interrupt, | ||
51 | * so allow interrupt sharing. | ||
52 | */ | ||
53 | static struct irqaction fpu_irq = { | ||
54 | .handler = math_error_irq, | ||
55 | .mask = CPU_MASK_NONE, | ||
56 | .name = "fpu", | ||
57 | }; | ||
58 | |||
59 | void __init init_ISA_irqs (void) | ||
60 | { | ||
61 | int i; | ||
62 | |||
63 | #ifdef CONFIG_X86_LOCAL_APIC | ||
64 | init_bsp_APIC(); | ||
65 | #endif | ||
66 | init_8259A(0); | ||
67 | |||
68 | /* | ||
69 | * 16 old-style INTA-cycle interrupts: | ||
70 | */ | ||
71 | for (i = 0; i < 16; i++) { | ||
72 | set_irq_chip_and_handler_name(i, &i8259A_chip, | ||
73 | handle_level_irq, "XT"); | ||
74 | } | ||
75 | } | ||
76 | |||
77 | /* Overridden in paravirt.c */ | ||
78 | void init_IRQ(void) __attribute__((weak, alias("native_init_IRQ"))); | ||
79 | |||
80 | void __init native_init_IRQ(void) | ||
81 | { | ||
82 | int i; | ||
83 | |||
84 | /* all the set up before the call gates are initialised */ | ||
85 | pre_intr_init_hook(); | ||
86 | |||
87 | /* | ||
88 | * Cover the whole vector space, no vector can escape | ||
89 | * us. (some of these will be overridden and become | ||
90 | * 'special' SMP interrupts) | ||
91 | */ | ||
92 | for (i = 0; i < (NR_VECTORS - FIRST_EXTERNAL_VECTOR); i++) { | ||
93 | int vector = FIRST_EXTERNAL_VECTOR + i; | ||
94 | if (i >= NR_IRQS) | ||
95 | break; | ||
96 | /* SYSCALL_VECTOR was reserved in trap_init. */ | ||
97 | if (!test_bit(vector, used_vectors)) | ||
98 | set_intr_gate(vector, interrupt[i]); | ||
99 | } | ||
100 | |||
101 | /* setup after call gates are initialised (usually add in | ||
102 | * the architecture specific gates) | ||
103 | */ | ||
104 | intr_init_hook(); | ||
105 | |||
106 | /* | ||
107 | * External FPU? Set up irq13 if so, for | ||
108 | * original braindamaged IBM FERR coupling. | ||
109 | */ | ||
110 | if (boot_cpu_data.hard_math && !cpu_has_fpu) | ||
111 | setup_irq(FPU_IRQ, &fpu_irq); | ||
112 | |||
113 | irq_ctx_init(smp_processor_id()); | ||
114 | } | ||