linux-kernel - Re: [tip:x86/mm2] x86, boot: enable support load bzImage and ramdisk above 4G

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Date:	Tue, 29 Jan 2013 17:54:41 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	yinghai@...nel.org, caushik1@...il.com, matt.fleming@...el.com,
	jmillenbach@...il.com, tglx@...utronix.de, josh@...htriplett.org,
	hpa@...ux.intel.com, rob@...dley.net
Subject: Re: [tip:x86/mm2] x86, boot: enable support load bzImage and ramdisk
 above 4G

On Tue, Jan 29, 2013 at 5:45 PM, tip-bot for Yinghai Lu
<yinghai@...nel.org> wrote:
> Commit-ID:  8cf52eb755e5c5046d2a5d5d3b64d839677ed8ae
> Gitweb:     http://git.kernel.org/tip/8cf52eb755e5c5046d2a5d5d3b64d839677ed8ae
> Author:     Yinghai Lu <yinghai@...nel.org>
> AuthorDate: Mon, 28 Jan 2013 20:16:44 -0800
> Committer:  H. Peter Anvin <hpa@...ux.intel.com>
> CommitDate: Tue, 29 Jan 2013 15:30:22 -0800
>
> x86, boot: enable support load bzImage and ramdisk above 4G
>
> xloadflags bit 1 indicates that we can load the kernel and all data
> structure above 4G; it is set if kernel is relocatable and 64bit.
>
> bootloader will check if xloadflags bit1 is set to decicde if
> it could load ramdisk and kernel high above 4G.
>
> bootloader will fill value to ext_ramdisk_image/size for high 32bits
> when it load ramdisk above 4G.
> kernel use get_ramdisk_image/size to use ext_ramdisk_image/size to get
> right positon for ramdisk.
>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> Cc: Rob Landley <rob@...dley.net>
> Cc: Matt Fleming <matt.fleming@...el.com>
> Cc: Gokul Caushik <caushik1@...il.com>
> Cc: Josh Triplett <josh@...htriplett.org>
> Cc: Joe Millenbach <jmillenbach@...il.com>
> Link: http://lkml.kernel.org/r/1359058816-7615-26-git-send-email-yinghai@kernel.org
> Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
> ---
>  arch/x86/boot/compressed/cmdline.c |  2 ++
>  arch/x86/boot/compressed/misc.c    | 19 +++++++++++++++++++
>  arch/x86/boot/header.S             | 10 +++++++++-
>  arch/x86/kernel/head64.c           |  2 ++
>  arch/x86/kernel/setup.c            |  4 ++++
>  5 files changed, 36 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/boot/compressed/cmdline.c b/arch/x86/boot/compressed/cmdline.c
> index b4c913c..bffd73b 100644
> --- a/arch/x86/boot/compressed/cmdline.c
> +++ b/arch/x86/boot/compressed/cmdline.c
> @@ -17,6 +17,8 @@ static unsigned long get_cmd_line_ptr(void)
>  {
>         unsigned long cmd_line_ptr = real_mode->hdr.cmd_line_ptr;
>
> +       cmd_line_ptr |= (u64)real_mode->ext_cmd_line_ptr << 32;
> +
>         return cmd_line_ptr;
>  }
>  int cmdline_find_option(const char *option, char *buffer, int bufsize)
> diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
> index 7cb56c6..5d8dc86 100644
> --- a/arch/x86/boot/compressed/misc.c
> +++ b/arch/x86/boot/compressed/misc.c
> @@ -318,6 +318,23 @@ static void parse_elf(void *output)
>         free(phdrs);
>  }
>
> +static void sanitize_real_mode(struct boot_params *real_mode)
> +{
> +       if (real_mode->sentinel) {
> +               /*fields in boot_params are not valid, clear them */
> +               memset(&real_mode->olpc_ofw_header, 0,
> +                      (char *)&real_mode->alt_mem_k -
> +                       (char *)&real_mode->olpc_ofw_header);
> +               memset(&real_mode->_pad7[0], 0,
> +                      (char *)&real_mode->edd_mbr_sig_buffer[0] -
> +                       (char *)&real_mode->_pad7[0]);
> +               memset(&real_mode->_pad8[0], 0,
> +                      (char *)&real_mode->eddbuf[0] -
> +                       (char *)&real_mode->_pad8[0]);
> +               memset(&real_mode->_pad9[0], 0, sizeof(real_mode->_pad9));
> +       }
> +}
> +
>  asmlinkage void decompress_kernel(void *rmode, memptr heap,
>                                   unsigned char *input_data,
>                                   unsigned long input_len,
> @@ -327,6 +344,8 @@ asmlinkage void decompress_kernel(void *rmode, memptr heap,
>
>         sanitize_boot_params(real_mode);
>
> +       sanitize_real_mode(real_mode);
> +

Hi, Peter,

sanitize_real_mode() need to be dropped from this patch.

You already have complete patch sanitize_boot_params() applied before.

Thanks

Yinghai
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