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fw_cfg: document fw_cfg_modify_iXX() update functions 

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 <somlo@cmu.edu>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gabriel L. Somlo 2015-10-08 17:02:53 +02:00 committed by Gerd Hoffmann
parent 6407d76eb4
commit 57c3d238a5
1 changed files with 11 additions and 0 deletions
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docs/specs/fw_cfg.txt
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@ -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 a dynamically allocated copy of the appropriately sized item to fw_cfg
under the given selector key value. 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() == == fw_cfg_add_file() ==
Given a filename (i.e., fw_cfg item name), starting pointer, and size, Given a filename (i.e., fw_cfg item name), starting pointer, and size,