linux-kernel - Re: [patch 4/6] x86: irqinit

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Date:	Wed, 1 Apr 2009 16:53:28 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
Cc:	hpa@...or.com, tglx@...utronix.de, linux-kernel@...r.kernel.org,
	xemul@...nvz.org, yhlu.kernel@...il.com
Subject: Re: [patch 4/6] x86: irqinit - merge native_init_IRQ


* Cyrill Gorcunov <gorcunov@...nvz.org> wrote:

> For this purpose init_ISA_irqs is called indirectly
> by x86_quirk_pre_intr_init.
> 
> Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
> ---
>  arch/x86/kernel/irqinit_32.c |    4 +++-
>  arch/x86/kernel/irqinit_64.c |   22 +++++++++++++++++++++-
>  arch/x86/kernel/setup.c      |    8 ++++++++
>  3 files changed, 32 insertions(+), 2 deletions(-)
> 
> Index: linux-2.6.git/arch/x86/kernel/irqinit_32.c
> ===================================================================
> --- linux-2.6.git.orig/arch/x86/kernel/irqinit_32.c
> +++ linux-2.6.git/arch/x86/kernel/irqinit_32.c
> @@ -215,7 +215,7 @@ void __init native_init_IRQ(void)
>  	 */
>  	for (i = 0; i < (NR_VECTORS - FIRST_EXTERNAL_VECTOR); i++) {
>  		int vector = FIRST_EXTERNAL_VECTOR + i;
> -		/* SYSCALL_VECTOR was reserved in trap_init. */
> +		/* X86-32: SYSCALL_VECTOR was reserved in trap_init. */
>  		if (!test_bit(vector, used_vectors))
>  			set_intr_gate(vector, interrupt[i]);
>  	}
> @@ -229,6 +229,7 @@ void __init native_init_IRQ(void)
>  	 */
>  	x86_quirk_intr_init();
>  
> +#ifdef CONFIG_X86_32
>  	/*
>  	 * External FPU? Set up irq13 if so, for
>  	 * original braindamaged IBM FERR coupling.
> @@ -237,4 +238,5 @@ void __init native_init_IRQ(void)
>  		setup_irq(FPU_IRQ, &fpu_irq);
>  
>  	irq_ctx_init(smp_processor_id());
> +#endif
>  }
> Index: linux-2.6.git/arch/x86/kernel/irqinit_64.c
> ===================================================================
> --- linux-2.6.git.orig/arch/x86/kernel/irqinit_64.c
> +++ linux-2.6.git/arch/x86/kernel/irqinit_64.c
> @@ -21,6 +21,7 @@
>  #include <asm/pgtable.h>
>  #include <asm/desc.h>
>  #include <asm/apic.h>
> +#include <asm/setup.h>
>  #include <asm/i8259.h>
>  
>  /*
> @@ -174,7 +175,8 @@ void __init native_init_IRQ(void)
>  {
>  	int i;
>  
> -	init_ISA_irqs();
> +	/* Execute any quirks before the call gates are initialised: */
> +	x86_quirk_pre_intr_init();
>  
>  	apic_intr_init();
>  
> @@ -185,10 +187,28 @@ void __init native_init_IRQ(void)
>  	 */
>  	for (i = 0; i < (NR_VECTORS - FIRST_EXTERNAL_VECTOR); i++) {
>  		int vector = FIRST_EXTERNAL_VECTOR + i;
> +		/* X86-32: SYSCALL_VECTOR was reserved in trap_init. */
>  		if (!test_bit(vector, used_vectors))
>  			set_intr_gate(vector, interrupt[i]);
>  	}
>  
>  	if (!acpi_ioapic)
>  		setup_irq(2, &irq2);
> +
> +	/*
> +	 * Call quirks after call gates are initialised (usually add in
> +	 * the architecture specific gates):
> +	 */
> +	x86_quirk_intr_init();
> +
> +#ifdef CONFIG_X86_32
> +	/*
> +	 * 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
>  }
> Index: linux-2.6.git/arch/x86/kernel/setup.c
> ===================================================================
> --- linux-2.6.git.orig/arch/x86/kernel/setup.c
> +++ linux-2.6.git/arch/x86/kernel/setup.c
> @@ -1087,3 +1087,11 @@ void __init x86_quirk_time_init(void)
>  	setup_irq(0, &irq0);
>  }
>  #endif /* CONFIG_X86_32 */
> +
> +#ifdef CONFIG_X86_64
> +void x86_quirk_pre_intr_init(void)
> +{
> +	init_ISA_irqs();
> +}
> +void x86_quirk_intr_init(void) { }
> +#endif

Hm, wouldnt it be cleaner to add it as a new quirk function vector 
in struct x86_quirks? See arch/x86/include/asm/setup.h.

	Ingo
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