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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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2
src/include/ipxe/smbios.h
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@@ -162,7 +162,7 @@ struct smbios {
#define SMBIOS_VERSION( major, minor ) ( ( (major) << 8 ) | (minor) )
extern int find_smbios ( struct smbios *smbios );
extern int find_smbios_structure ( unsigned int type,
extern int find_smbios_structure ( unsigned int type, unsigned int instance,
struct smbios_structure *structure );
extern int read_smbios_structure ( struct smbios_structure *structure,
void *data, size_t len );