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Re: [Qemu-devel] [PATCH] fw_cfg: document fw_cfg_modify_iXX() update fun
From: |
Gabriel L. Somlo |
Subject: |
Re: [Qemu-devel] [PATCH] fw_cfg: document fw_cfg_modify_iXX() update functions |
Date: |
Thu, 16 Jul 2015 11:51:36 -0400 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
Ping ?
Thanks,
--Gabriel
On Mon, Jun 15, 2015 at 02:45:47PM -0400, Gabriel L. Somlo wrote:
> Document the behavior of fw_cfg_modify_iXX() for leak-less updating
> of integer-type blobs.
>
> Currently only fw_cfg_modify_i16() is coded, but 32- and 64-bit versions
> may be added later if necessary..
>
> Signed-off-by: Gabriel Somlo <address@hidden>
> ---
> docs/specs/fw_cfg.txt | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/docs/specs/fw_cfg.txt b/docs/specs/fw_cfg.txt
> index 74351dd..5bc7b96 100644
> --- a/docs/specs/fw_cfg.txt
> +++ b/docs/specs/fw_cfg.txt
> @@ -159,6 +159,17 @@ will convert a 16-, 32-, or 64-bit integer to
> little-endian, then add
> a dynamically allocated copy of the appropriately sized item to fw_cfg
> under the given selector key value.
>
> +== fw_cfg_modify_iXX() ==
> +
> +Modify the value of an XX-bit item (where XX may be 16, 32, or 64).
> +Similarly to the corresponding fw_cfg_add_iXX() function set, convert
> +a 16-, 32-, or 64-bit integer to little endian, create a dynamically
> +allocated copy of the required size, and replace the existing item at
> +the given selector key value with the newly allocated one. The previous
> +item, assumed to have been allocated during an earlier call to
> +fw_cfg_add_iXX() or fw_cfg_modify_iXX() (of the same width XX), is freed
> +before the function returns.
> +
> == fw_cfg_add_file() ==
>
> Given a filename (i.e., fw_cfg item name), starting pointer, and size,
> --
> 2.1.0
>
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