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From: Yinghai Lu <yinghai@kernel.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	linux-kernel@vger.kernel.org, Rob Landley <rob@landley.net>,
	Matt Fleming <matt.fleming@intel.com>
Subject: Re: [PATCH v3 11/12] x86, boot: add fields to support load bzImage and ramdisk high
Date: Thu, 22 Nov 2012 10:28:29 -0800	[thread overview]
Message-ID: <CAE9FiQUoj9k0Tbqp8LC8Wb21_s_x8naiWX4zkX9pJG-oFnAQ9g@mail.gmail.com> (raw)
In-Reply-To: <a8b15bf0-4e3b-4fde-9190-26890f9abf77@email.android.com>

On Thu, Nov 22, 2012 at 7:59 AM, H. Peter Anvin <hpa@zytor.com> wrote:
> Looks good to me.
>

has problem with old kexec, it only copy header from bzImage include
setup_header as boot_param.

00000000  ea 05 00 c0 07 8c c8 8e  d8 8e c0 8e d0 31 e4 fb  |.............1..|
00000010  fc be 2d 00 ac 20 c0 74  09 b4 0e bb 07 00 cd 10  |..-.. .t........|
00000020  eb f2 31 c0 cd 16 cd 19  ea f0 ff 00 f0 44 69 72  |..1..........Dir|
00000030  65 63 74 20 66 6c 6f 70  70 79 20 62 6f 6f 74 20  |ect floppy boot |
00000040  69 73 20 6e 6f 74 20 73  75 70 70 6f 72 74 65 64  |is not supported|
00000050  2e 20 55 73 65 20 61 20  62 6f 6f 74 20 6c 6f 61  |. Use a boot loa|
00000060  64 65 72 20 70 72 6f 67  72 61 6d 20 69 6e 73 74  |der program inst|
00000070  65 61 64 2e 0d 0a 0a 52  65 6d 6f 76 65 20 64 69  |ead....Remove di|
00000080  73 6b 20 61 6e 64 20 70  72 65 73 73 20 61 6e 79  |sk and press any|
00000090  20 6b 65 79 20 74 6f 20  72 65 62 6f 6f 74 20 2e  | key to reboot .|
000000a0  2e 2e 0d 0a 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000000b0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
000001f0  00 21 01 00 33 15 09 00  00 00 ff ff 00 00 55 aa  |.!..3.........U.|


so will have stuff in 0x70

then i change to 0xC0, when CONFIG_EFI_STUB is enabled, there is value
there too.


00000000  4d 5a ea 07 00 c0 07 8c  c8 8e d8 8e c0 8e d0 31  |MZ.............1|
00000010  e4 fb fc be 40 00 ac 20  c0 74 09 b4 0e bb 07 00  |....@.. .t......|
00000020  cd 10 eb f2 31 c0 cd 16  cd 19 ea f0 ff 00 f0 00  |....1...........|
00000030  00 00 00 00 00 00 00 00  00 00 00 00 b8 00 00 00  |................|
00000040  44 69 72 65 63 74 20 66  6c 6f 70 70 79 20 62 6f  |Direct floppy bo|
00000050  6f 74 20 69 73 20 6e 6f  74 20 73 75 70 70 6f 72  |ot is not suppor|
00000060  74 65 64 2e 20 55 73 65  20 61 20 62 6f 6f 74 20  |ted. Use a boot |
00000070  6c 6f 61 64 65 72 20 70  72 6f 67 72 61 6d 20 69  |loader program i|
00000080  6e 73 74 65 61 64 2e 0d  0a 0a 52 65 6d 6f 76 65  |nstead....Remove|
00000090  20 64 69 73 6b 20 61 6e  64 20 70 72 65 73 73 20  | disk and press |
000000a0  61 6e 79 20 6b 65 79 20  74 6f 20 72 65 62 6f 6f  |any key to reboo|
000000b0  74 20 2e 2e 2e 0d 0a 00  50 45 00 00 64 86 03 00  |t ......PE..d...|
000000c0  00 00 00 00 00 00 00 00  01 00 00 00 a0 00 06 02  |................|
000000d0  0b 02 02 14 20 be 91 00  00 00 00 00 00 00 00 00  |.... ...........|
000000e0  10 46 00 00 00 02 00 00  00 00 00 00 00 00 00 00  |.F..............|
000000f0  20 00 00 00 20 00 00 00  00 00 00 00 00 00 00 00  | ... ...........|
00000100  00 00 00 00 00 00 00 00  20 c0 91 00 00 02 00 00  |........ .......|
00000110  00 00 00 00 0a 00 00 00  00 00 00 00 00 00 00 00  |................|
00000120  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000130  00 00 00 00 00 00 00 00  00 00 00 00 06 00 00 00  |................|
00000140  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000170  2e 73 65 74 75 70 00 00  e0 41 00 00 00 02 00 00  |.setup...A......|
00000180  e0 41 00 00 00 02 00 00  00 00 00 00 00 00 00 00  |.A..............|
00000190  00 00 00 00 20 00 50 60  2e 72 65 6c 6f 63 00 00  |.... .P`.reloc..|
000001a0  20 00 00 00 e0 43 00 00  20 00 00 00 e0 43 00 00  | ....C.. ....C..|
000001b0  00 00 00 00 00 00 00 00  00 00 00 00 40 00 10 42  |............@..B|
000001c0  2e 74 65 78 74 00 00 00  20 7c 91 00 00 44 00 00  |.text... |...D..|
000001d0  20 7c 91 00 00 44 00 00  00 00 00 00 00 00 00 00  | |...D..........|
000001e0  00 00 00 00 20 00 50 60  00 00 00 00 00 00 00 00  |.... .P`........|
000001f0  00 21 01 00 c2 17 09 00  00 00 ff ff 00 00 55 aa  |.!............U.|


looks we only can use [0x30,0x3c), [0x1e8, 0x1f0), but in boot_params, they
are apm_bios_info, and alt_mem_k...

so looks we still have to use setup_header instead.

  reply	other threads:[~2012-11-22 18:28 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-11-21  7:15 [PATCH v3 00/12] x86, boot, 64bit: Add support for loading ramdisk and bzImage high Yinghai Lu
2012-11-21  7:15 ` [PATCH v3 01/12] x86, boot: move verify_cpu.S after 0x200 Yinghai Lu
2012-11-21 17:23   ` H. Peter Anvin
2012-11-21 19:45     ` Yinghai Lu
2012-11-21 19:50       ` H. Peter Anvin
2012-11-21 20:15         ` Yinghai Lu
2012-11-22  5:48           ` Eric W. Biederman
     [not found]             ` <3178cb29-0e9e-44d2-b21f-45c53f38980a@email.android.com>
2012-11-22 11:27               ` Eric W. Biederman
2012-11-24  7:00                 ` Yinghai Lu
2012-11-21  7:16 ` [PATCH v3 02/12] x86, boot: Move lldt/ltr out of 64bit code section Yinghai Lu
2012-11-21  7:16 ` [PATCH v3 03/12] x86, 64bit: set extra ident page table for whole kernel range Yinghai Lu
2012-11-21  7:16 ` [PATCH v3 04/12] x86, 64bit: add support for loading kernel above 512G Yinghai Lu
2012-11-21  7:16 ` [PATCH v3 05/12] x86: Merge early_reserve_initrd for 32bit and 64bit Yinghai Lu
2012-11-21  7:40   ` Pekka Enberg
2012-11-21  7:16 ` [PATCH v3 06/12] x86: add get_ramdisk_image/size Yinghai Lu
2012-11-21  7:16 ` [PATCH v3 07/12] x86, boot: add get_cmd_line_ptr() Yinghai Lu
2012-11-21  7:16 ` [PATCH v3 08/12] x86, boot: Don't check if cmd_line_ptr is accessible in misc/decompressor() Yinghai Lu
2012-11-21 17:21   ` H. Peter Anvin
2012-11-21 19:18     ` Yinghai Lu
2012-11-21  7:16 ` [PATCH v3 09/12] x86, boot: update cmd_line_ptr to unsigned long Yinghai Lu
2012-11-21  7:16 ` [PATCH v3 10/12] x86: use io_remap to access real_mode_data Yinghai Lu
2012-11-21  7:16 ` [PATCH v3 11/12] x86, boot: add fields to support load bzImage and ramdisk high Yinghai Lu
2012-11-21 17:17   ` H. Peter Anvin
2012-11-21 18:59     ` Yinghai Lu
2012-11-21 19:18       ` H. Peter Anvin
2012-11-22  5:56         ` Yinghai Lu
     [not found]           ` <a1ca794a-09d4-4d36-8c8c-67100cb3696e@email.android.com>
2012-11-22  6:47             ` Yinghai Lu
2012-11-22  6:58               ` Yinghai Lu
2012-11-22 15:59                 ` H. Peter Anvin
2012-11-22 18:28                   ` Yinghai Lu [this message]
2012-11-22 18:37                     ` H. Peter Anvin
2012-11-22 18:50                       ` Yinghai Lu
2012-11-22 18:51                         ` H. Peter Anvin
2012-11-22 20:18                           ` Yinghai Lu
2012-11-22 20:20                             ` H. Peter Anvin
2012-11-22 20:29                               ` Yinghai Lu
2012-11-22 20:50                             ` H. Peter Anvin
2012-11-22 21:02                               ` H. Peter Anvin
2012-11-22 22:13                                 ` Yinghai Lu
2012-11-24 12:37                       ` Eric W. Biederman
2012-11-24 17:32                         ` H. Peter Anvin
     [not found]                           ` <CAE9FiQV0Q0fi7TrNjihdsUt0ueT4LLON4o+JEmX6ry9S6AU-ug@mail.gmail.com>
2012-11-24 18:24                             ` H. Peter Anvin
2012-11-24 19:50                           ` H. Peter Anvin
2012-11-24 21:30                             ` Yinghai Lu
2012-11-24 21:38                               ` H. Peter Anvin
2012-11-24 22:18                                 ` Yinghai Lu
2012-11-24 22:32                                   ` H. Peter Anvin
2012-11-24 23:24                                     ` Yinghai Lu
2012-11-24 23:50                             ` Eric W. Biederman
2012-11-25  0:04                               ` H. Peter Anvin
2012-11-25  0:11                                 ` Yinghai Lu
2012-11-25  5:50                                   ` Yinghai Lu
2012-11-25  5:52                                     ` H. Peter Anvin
2012-11-25  6:09                                       ` Yinghai Lu
2012-11-25  0:04                               ` Yinghai Lu
2012-11-25  0:06                                 ` H. Peter Anvin
2012-11-21  7:16 ` [PATCH v3 12/12] x86: remove 1024g limitation for kexec buffer on 64bit Yinghai Lu

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