diff options
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kernel/irqinit_32.c | 53 | ||||
| -rw-r--r-- | arch/x86/kernel/irqinit_64.c | 82 |
2 files changed, 115 insertions, 20 deletions
diff --git a/arch/x86/kernel/irqinit_32.c b/arch/x86/kernel/irqinit_32.c index 4488b713396e..a780de3ad5da 100644 --- a/arch/x86/kernel/irqinit_32.c +++ b/arch/x86/kernel/irqinit_32.c @@ -22,7 +22,7 @@ #include <asm/i8259.h> #include <asm/traps.h> - +#ifdef CONFIG_X86_32 /* * Note that on a 486, we don't want to do a SIGFPE on an irq13 * as the irq is unreliable, and exception 16 works correctly @@ -52,6 +52,7 @@ static struct irqaction fpu_irq = { .handler = math_error_irq, .name = "fpu", }; +#endif /* * IRQ2 is cascade interrupt to second interrupt controller @@ -155,24 +156,6 @@ static void __init smp_intr_init(void) #endif /* CONFIG_SMP */ } -/** - * x86_quirk_pre_intr_init - initialisation prior to setting up interrupt vectors - * - * Description: - * Perform any necessary interrupt initialisation prior to setting up - * the "ordinary" interrupt call gates. For legacy reasons, the ISA - * interrupts should be initialised here if the machine emulates a PC - * in any way. - **/ -static void __init x86_quirk_pre_intr_init(void) -{ - if (x86_quirks->arch_pre_intr_init) { - if (x86_quirks->arch_pre_intr_init()) - return; - } - init_ISA_irqs(); -} - static void __init apic_intr_init(void) { smp_intr_init(); @@ -195,12 +178,36 @@ static void __init apic_intr_init(void) #endif } +#ifdef CONFIG_X86_32 +/** + * x86_quirk_pre_intr_init - initialisation prior to setting up interrupt vectors + * + * Description: + * Perform any necessary interrupt initialisation prior to setting up + * the "ordinary" interrupt call gates. For legacy reasons, the ISA + * interrupts should be initialised here if the machine emulates a PC + * in any way. + **/ +static void __init x86_quirk_pre_intr_init(void) +{ + if (x86_quirks->arch_pre_intr_init) { + if (x86_quirks->arch_pre_intr_init()) + return; + } + init_ISA_irqs(); +} +#endif + void __init native_init_IRQ(void) { int i; +#ifdef CONFIG_X86_32 /* Execute any quirks before the call gates are initialised: */ x86_quirk_pre_intr_init(); +#else + init_ISA_irqs(); +#endif /* * Cover the whole vector space, no vector can escape @@ -208,9 +215,15 @@ void __init native_init_IRQ(void) * 'special' SMP interrupts) */ for (i = FIRST_EXTERNAL_VECTOR; i < NR_VECTORS; i++) { +#ifdef CONFIG_X86_32 /* SYSCALL_VECTOR was reserved in trap_init. */ if (i != SYSCALL_VECTOR) set_intr_gate(i, interrupt[i-FIRST_EXTERNAL_VECTOR]); +#else + /* IA32_SYSCALL_VECTOR was reserved in trap_init. */ + if (i != IA32_SYSCALL_VECTOR) + set_intr_gate(i, interrupt[i-FIRST_EXTERNAL_VECTOR]); +#endif } apic_intr_init(); @@ -218,6 +231,7 @@ void __init native_init_IRQ(void) if (!acpi_ioapic) setup_irq(2, &irq2); +#ifdef CONFIG_X86_32 /* * Call quirks after call gates are initialised (usually add in * the architecture specific gates): @@ -232,4 +246,5 @@ void __init native_init_IRQ(void) setup_irq(FPU_IRQ, &fpu_irq); irq_ctx_init(smp_processor_id()); +#endif } diff --git a/arch/x86/kernel/irqinit_64.c b/arch/x86/kernel/irqinit_64.c index 61c9a922e80c..ed50e35ce97e 100644 --- a/arch/x86/kernel/irqinit_64.c +++ b/arch/x86/kernel/irqinit_64.c @@ -39,14 +39,46 @@ * (these are usually mapped into the 0x30-0xff vector range) */ +#ifdef CONFIG_X86_32 /* - * IRQ2 is cascade interrupt to second interrupt controller + * Note that on a 486, we don't want to do a SIGFPE on an irq13 + * as the irq is unreliable, and exception 16 works correctly + * (ie as explained in the intel literature). On a 386, you + * can't use exception 16 due to bad IBM design, so we have to + * rely on the less exact irq13. + * + * Careful.. Not only is IRQ13 unreliable, but it is also + * leads to races. IBM designers who came up with it should + * be shot. + */ + +static irqreturn_t math_error_irq(int cpl, void *dev_id) +{ + outb(0, 0xF0); + if (ignore_fpu_irq || !boot_cpu_data.hard_math) + return IRQ_NONE; + math_error((void __user *)get_irq_regs()->ip); + return IRQ_HANDLED; +} + +/* + * New motherboards sometimes make IRQ 13 be a PCI interrupt, + * so allow interrupt sharing. */ +static struct irqaction fpu_irq = { + .handler = math_error_irq, + .name = "fpu", +}; +#endif +/* + * IRQ2 is cascade interrupt to second interrupt controller + */ static struct irqaction irq2 = { .handler = no_action, .name = "cascade", }; + DEFINE_PER_CPU(vector_irq_t, vector_irq) = { [0 ... IRQ0_VECTOR - 1] = -1, [IRQ0_VECTOR] = 0, @@ -158,11 +190,36 @@ static void __init apic_intr_init(void) alloc_intr_gate(ERROR_APIC_VECTOR, error_interrupt); } +#ifdef CONFIG_X86_32 +/** + * x86_quirk_pre_intr_init - initialisation prior to setting up interrupt vectors + * + * Description: + * Perform any necessary interrupt initialisation prior to setting up + * the "ordinary" interrupt call gates. For legacy reasons, the ISA + * interrupts should be initialised here if the machine emulates a PC + * in any way. + **/ +static void __init x86_quirk_pre_intr_init(void) +{ + if (x86_quirks->arch_pre_intr_init) { + if (x86_quirks->arch_pre_intr_init()) + return; + } + init_ISA_irqs(); +} +#endif + void __init native_init_IRQ(void) { int i; +#ifdef CONFIG_X86_32 + /* Execute any quirks before the call gates are initialised: */ + x86_quirk_pre_intr_init(); +#else init_ISA_irqs(); +#endif /* * Cover the whole vector space, no vector can escape @@ -170,13 +227,36 @@ void __init native_init_IRQ(void) * 'special' SMP interrupts) */ for (i = FIRST_EXTERNAL_VECTOR; i < NR_VECTORS; i++) { +#ifdef CONFIG_X86_32 + /* SYSCALL_VECTOR was reserved in trap_init. */ + if (i != SYSCALL_VECTOR) + set_intr_gate(i, interrupt[i-FIRST_EXTERNAL_VECTOR]); +#else /* IA32_SYSCALL_VECTOR was reserved in trap_init. */ if (i != IA32_SYSCALL_VECTOR) set_intr_gate(i, interrupt[i-FIRST_EXTERNAL_VECTOR]); +#endif } apic_intr_init(); if (!acpi_ioapic) setup_irq(2, &irq2); + +#ifdef CONFIG_X86_32 + /* + * Call quirks after call gates are initialised (usually add in + * the architecture specific gates): + */ + x86_quirk_intr_init(); + + /* + * External FPU? Set up irq13 if so, for + * original braindamaged IBM FERR coupling. + */ + if (boot_cpu_data.hard_math && !cpu_has_fpu) + setup_irq(FPU_IRQ, &fpu_irq); + + irq_ctx_init(smp_processor_id()); +#endif } |