linux-kernel - Re: [PATCH v2] x86: Early-boot serial I/O support

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Date:	Sun, 11 Jul 2010 01:07:50 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	hpa@...or.com, x86@...nel.org, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>, Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH v2] x86: Early-boot serial I/O support

On Sat, Jul 10, 2010 at 10:40:20PM +0300, Pekka Enberg wrote:
> This patch adds serial I/O support to very early boot printf(). It's useful for
> debugging boot code when running Linux under KVM, for example. The actual code
> was lifted from early printk.
> 
> Cc: Cyrill Gorcunov <gorcunov@...il.com>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Yinghai Lu <yinghai@...nel.org>
> Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>
> ---
> v1 -> v2:
> 
>   - Use 'earlyprintk' kernel parameter to determine whether to use
>     early serial or not as suggested by Yinghai and hpa.
> 
>  arch/x86/boot/boot.h   |   16 +++++++
>  arch/x86/boot/main.c   |    3 +
>  arch/x86/boot/string.c |   41 ++++++++++++++++++
>  arch/x86/boot/tty.c    |  111 +++++++++++++++++++++++++++++++++++++++++++++---
>  4 files changed, 165 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/x86/boot/boot.h b/arch/x86/boot/boot.h
> index 98239d2..f05b5ac 100644
> --- a/arch/x86/boot/boot.h
> +++ b/arch/x86/boot/boot.h
> @@ -37,6 +37,8 @@
>  extern struct setup_header hdr;
>  extern struct boot_params boot_params;
>  
> +#define cpu_relax()	asm volatile("rep; nop" ::: "memory")
> +
>  /* Basic port I/O */
>  static inline void outb(u8 v, u16 port)
>  {
> @@ -203,6 +205,17 @@ static inline int isdigit(int ch)
>  	return (ch >= '0') && (ch <= '9');
>  }
>  
> +static inline int isxdigit(int ch)
> +{
> +	if (isdigit(ch))
> +		return true;
> +
> +	if ((ch >= 'a') && (ch <= 'f'))
> +		return true;
> +
> +	return (ch >= 'A') && (ch <= 'F');
> +}
> +

I suspect it's supposed to be static inline *bool*, right?

	-- Cyrill
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