linux-kernel - Re: [PATCH v3 11/12] x86, boot: add fields to support load bzImage and ramdisk high

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Message-ID: <CAE9FiQXS6jc8+N5533HFnqT3_eF5dHzYXkxoUJ8JRVq8VfcSNg@mail.gmail.com>
Date:	Thu, 22 Nov 2012 14:13:08 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org, Rob Landley <rob@...dley.net>,
	Matt Fleming <matt.fleming@...el.com>
Subject: Re: [PATCH v3 11/12] x86, boot: add fields to support load bzImage
 and ramdisk high

On Thu, Nov 22, 2012 at 1:02 PM, H. Peter Anvin <hpa@...or.com> wrote:
> On 11/22/2012 12:50 PM, H. Peter Anvin wrote:
>>
>> The limit is 0x280, not 0x290, or -- better -- you can use the byte at
>> 0x201 to get the size.
>>
>
> Not doing so would be wrong, in fact.

+	if (!real_mode_entry) {
+		unsigned long end;
+		/* clear value before header */
+		memset(real_mode, 0, 0x1f1);
+		/* clear value after setup_header  */
+		end = *((unsigned char *)real_mode + 0x201);
+		end += 0x202;
+		memset((unsigned char *)real_mode + end, 0, kern16_size - end);
+	}
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