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[smbios] Allow access to multiple instances of SMBIOS structures

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Extend the syntax for numerical SMBIOS settings from

  smbios/<type>.<offset>.<length>

to

  smbios/[<instance>.]<type>.<offset>.<length>

Where SMBIOS provides multiple structures with the same <type>, this
extended syntax allows for access to structures other than the first.
If <instance> is omitted then it will default to zero, giving access
to the first instance (and so matching existing behaviour).

The 16-bit SMBIOS handle (which is an alternative way to disambiguate
multiple instances of the same type of structure) can be accessed, if
required, using

  smbios/<instance>.<type>.2.2:uint16

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2013-05-01 20:42:57 +01:00
parent a352fde45e
commit 8bc20c1aa0
3 changed files with 10 additions and 5 deletions
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6
src/interface/smbios/smbios.c
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@@ -59,10 +59,11 @@ static size_t find_strings_terminator ( size_t offset ) {
* Find specific structure type within SMBIOS
*
* @v type Structure type to search for
* @v instance Instance of this type of structure
* @v structure SMBIOS structure descriptor to fill in
* @ret rc Return status code
*/
int find_smbios_structure ( unsigned int type,
int find_smbios_structure ( unsigned int type, unsigned int instance,
struct smbios_structure *structure ) {
unsigned int count = 0;
size_t offset = 0;
@@ -105,7 +106,8 @@ int find_smbios_structure ( unsigned int type,
structure->header.len, structure->strings_len );
/* If this is the structure we want, return */
if ( structure->header.type == type ) {
if ( ( structure->header.type == type ) &&
( instance-- == 0 ) ) {
structure->offset = offset;
return 0;
}