From: "Gabriel L. Somlo" <so...@cmu.edu> 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 <so...@cmu.edu> Signed-off-by: Gerd Hoffmann <kra...@redhat.com> Reviewed-by: Laszlo Ersek <ler...@redhat.com> --- 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, -- 2.4.3
