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[acpi] Allow for extraction of a MAC address from the DSDT/SSDT

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Some vendors provide a "system MAC address" within the DSDT/SSDT, to
be used to override the MAC address for a USB docking station.

A full implementation would require an ACPI bytecode interpreter,
since at least one OEM allows the MAC address to be constructed by
executable ACPI bytecode (rather than a fixed data structure).

We instead attempt to extract a plausible-looking "_AUXMAC_#.....#"
string that appears shortly after an "AMAC" or "MACA" signature.  This
should work for most implementations encountered in practice.

Debugged-by: Andreas Hammarskjöld <junior@2PintSoftware.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2021-09-08 13:50:20 +01:00
parent 02ec659b73
commit 0cc4c42f0a
3 changed files with 169 additions and 0 deletions
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14
src/include/ipxe/acpimac.h Normal file
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@@ -0,0 +1,14 @@
#ifndef _IPXE_ACPIMAC_H
#define _IPXE_ACPIMAC_H
/** @file
*
* ACPI MAC address
*
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
extern int acpi_mac ( uint8_t *hw_addr );
#endif /* _IPXE_ACPIMAC_H */

1
src/include/ipxe/errfile.h
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@@ -77,6 +77,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#define ERRFILE_fdt ( ERRFILE_CORE | 0x00250000 )
#define ERRFILE_dma ( ERRFILE_CORE | 0x00260000 )
#define ERRFILE_cachedhcp ( ERRFILE_CORE | 0x00270000 )
#define ERRFILE_acpimac ( ERRFILE_CORE | 0x00280000 )
#define ERRFILE_eisa ( ERRFILE_DRIVER | 0x00000000 )
#define ERRFILE_isa ( ERRFILE_DRIVER | 0x00010000 )