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[efi] Add support for installing EFI configuration tables

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Add the ability to install and uninstall arbitrary EFI configuration
tables.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2025-03-27 14:45:12 +00:00
parent f0caf90a72
commit 98f86b4d0a
4 changed files with 217 additions and 18 deletions
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37
src/include/ipxe/efi/efi_table.h Normal file
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@@ -0,0 +1,37 @@
#ifndef _IPXE_EFI_TABLE_H
#define _IPXE_EFI_TABLE_H
/** @file
*
* EFI configuration tables
*
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <ipxe/efi/efi.h>
/** An installable EFI configuration table type */
struct efi_table {
/** Table GUID */
EFI_GUID *guid;
/**
* Determine length of table
*
* @v data Configuration table data (presumed valid)
* @ret len Length of table
*
* EFI does not record the length of installed configuration
* tables. Consumers must understand the specific type of
* table in order to be able to determine its length from the
* contents.
*/
size_t ( * len ) ( const void *data );
};
extern void * efi_find_table ( EFI_GUID *guid );
extern int efi_install_table ( struct efi_table *table, const void *data,
void **backup );
extern int efi_uninstall_table ( struct efi_table *table, void **backup );
#endif /* _IPXE_EFI_TABLE_H */

1
src/include/ipxe/errfile.h
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@@ -85,6 +85,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#define ERRFILE_efi_service ( ERRFILE_CORE | 0x002d0000 )
#define ERRFILE_null_smbios ( ERRFILE_CORE | 0x002e0000 )
#define ERRFILE_efi_open ( ERRFILE_CORE | 0x002f0000 )
#define ERRFILE_efi_table ( ERRFILE_CORE | 0x00300000 )
#define ERRFILE_eisa ( ERRFILE_DRIVER | 0x00000000 )
#define ERRFILE_isa ( ERRFILE_DRIVER | 0x00010000 )