linux-kernel - [PATCH -mm -v5 0/3] i386/x86_64 boot: 32-bit boot protocol

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Date:	Fri, 12 Oct 2007 13:52:25 +0800
From:	"Huang, Ying" <ying.huang@...el.com>
To:	"H. Peter Anvin" <hpa@...or.com>, Andi Kleen <ak@...e.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	akpm@...ux-foundation.org, Yinghai Lu <yhlu.kernel@...il.com>,
	Chandramouli Narayanan <mouli@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH -mm -v5 0/3] i386/x86_64 boot: 32-bit boot protocol

This patchset defines a 32-bit boot protocol for i386/x86_64 platform,
adds an extensible boot parameter passing mechanism, export the boot
parameters via sysfs.

The patchset has been tested against 2.6.23-rc8-mm2 kernel on x86_64
and i386.

This patchset is based on the proposal of Peter Anvin.


Known Issues:

- Where is safe to place the linked list of setup_data?  Because the
  length of the linked list of setup_data is variable, it can not be
  copied into BSS segment of kernel as that of "zero page". We must
  find a safe place for it, where it will not be overwritten by kernel
  during booting up. The i386 kernel will overwrite some pages after
  _end. The x86_64 kernel will overwrite some pages from 0x1000 on.

- The fields in zero page are fairly complex (such as struct
  edd_info). Is it necessary to document every field inside the first
  level fields, until the primary data type? Or is it sufficient to
  provide the C struct name only?


v5:

- Use bt_ioremap/bt_iounmap in copy_setup_data.

v4:

- Reserve setup_data and boot parameters for accessing during
  runtime.
- Export boot parameters via sysfs.

v3:

- Move hd0_info and hd1_info back to zero page for compatibility.

v2:

- Increase the boot protocol version number
- Check version number before parsing setup data.
- Revise zero page description according to the source code and move
  them to zero-page.txt.


Best Regards,
Huang Ying
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