linux-kernel - Re: [PATCH 9/33] i386 boot: Add serial output support to the decompressor

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Message-ID: <m1r6zzx41y.fsf@ebiederm.dsl.xmission.com>
Date:	Tue, 01 Aug 2006 20:30:17 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Andi Kleen <ak@...e.de>
Cc:	<linux-kernel@...r.kernel.org>, Horms <horms@...ge.net.au>,
	Jan Kratochvil <lace@...kratochvil.net>,
	"H. Peter Anvin" <hpa@...or.com>,
	Magnus Damm <magnus.damm@...il.com>,
	Vivek Goyal <vgoyal@...ibm.com>, Linda Wang <lwang@...hat.com>
Subject: Re: [PATCH 9/33] i386 boot: Add serial output support to the decompressor

Andi Kleen <ak@...e.de> writes:

> "Eric W. Biederman" <ebiederm@...ssion.com> writes:
>>  			}
>> @@ -200,6 +224,178 @@ static void putstr(const char *s)
>>  	outb_p(0xff & (pos >> 1), vidport+1);
>>  }
>>  
>> +static void vid_console_init(void)
>
> Please just use early_printk instead of reimplementing this. 
> I think it should work in this context too.

It doesn't or at least it didn't.  I can look again though.

>> +static inline int tolower(int ch)
>> +{
>> +	return ch | 0x20;
>> +}
>> +
>> +static inline int isdigit(int ch)
>> +{
>> +	return (ch >= '0') && (ch <= '9');
>> +}
>> +
>> +static inline int isxdigit(int ch)
>> +{
>> +	ch = tolower(ch);
>> +	return isdigit(ch) || ((ch >= 'a') && (ch <= 'f'));
>> +}
>
> And please reuse the Linux code here.

Reuse is hard because we really are a separate executable,
in a slightly different environment.

> Actually the best way to reuse would be to first do 64bit uncompressor
> and linker directly, but short of that #includes would be fine too.

> Would be better to just pull in lib/string.c

Maybe.  Size is fairly important here so I am concerned that I
will pull in more than I need.  But look and see if I can pull
in just a subset of what is needed.

Eric
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