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[efi] Allow use of EFI configuration tables

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EFI passes in copies of SMBIOS and other system configuration tables
via the EFI system table.  Allow configuration tables to be requested
using a mechanism similar to the current method for requesting EFI
protocols.
This commit is contained in:
Michael Brown 2008-12-04 04:04:54 +00:00
parent 3a799e99ca
commit 045a22764a
2 changed files with 78 additions and 4 deletions
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33
src/include/gpxe/efi/efi.h
View File

@ -43,6 +43,7 @@
/** An EFI protocol used by gPXE */
struct efi_protocol {
/** GUID */
union {
/** EFI protocol GUID */
EFI_GUID guid;
@ -70,6 +71,38 @@ struct efi_protocol {
(_ptr) : (_ptr) ) ), \
}
/** An EFI configuration table used by gPXE */
struct efi_config_table {
/** GUID */
union {
/** EFI configuration table GUID */
EFI_GUID guid;
/** UUID structure understood by gPXE */
union uuid uuid;
} u;
/** Variable containing pointer to configuration table */
void **table;
/** Table is required for operation */
int required;
};
/** Declare an EFI configuration table used by gPXE */
#define __efi_config_table \
__table ( struct efi_config_table, efi_config_tables, 01 )
/** Declare an EFI configuration table to be used by gPXE
*
* @v _table EFI configuration table name
* @v _ptr Pointer to configuration table
* @v _required Table is required for operation
*/
#define EFI_USE_TABLE( _table, _ptr, _required ) \
struct efi_config_table __ ## _table __efi_config_table = { \
.u.guid = _table ## _GUID, \
.table = ( ( void ** ) ( void * ) (_ptr) ), \
.required = (_required), \
}
/** Convert a gPXE status code to an EFI status code
*
* FIXME: actually perform some kind of conversion. gPXE error codes

49
src/interface/efi/efi_entry.c
View File

@ -17,6 +17,7 @@
*/
#include <stdlib.h>
#include <string.h>
#include <gpxe/efi/efi.h>
#include <gpxe/uuid.h>
@ -32,6 +33,30 @@ static struct efi_protocol efi_protocols[0] \
static struct efi_protocol efi_protocols_end[0] \
__table_end ( struct efi_protocol, efi_protocols );
/** Declared used EFI configuration tables */
static struct efi_config_table efi_config_tables[0] \
__table_start ( struct efi_config_table, efi_config_tables );
static struct efi_config_table efi_config_tables_end[0] \
__table_end ( struct efi_config_table, efi_config_tables );
/**
* Look up EFI configuration table
*
* @v guid Configuration table GUID
* @ret table Configuration table, or NULL
*/
static void * efi_find_table ( EFI_GUID *guid ) {
unsigned int i;
for ( i = 0 ; i < efi_systab->NumberOfTableEntries ; i++ ) {
if ( memcmp ( &efi_systab->ConfigurationTable[i].VendorGuid,
guid, sizeof ( *guid ) ) == 0 )
return efi_systab->ConfigurationTable[i].VendorTable;
}
return NULL;
}
/**
* EFI entry point
*
@ -43,6 +68,7 @@ EFI_STATUS EFIAPI efi_entry ( EFI_HANDLE image_handle,
EFI_SYSTEM_TABLE *systab ) {
EFI_BOOT_SERVICES *bs;
struct efi_protocol *prot;
struct efi_config_table *tab;
EFI_STATUS efirc;
/* Store image handle and system table pointer for future use */
@ -65,17 +91,32 @@ EFI_STATUS EFIAPI efi_entry ( EFI_HANDLE image_handle,
}
DBGC ( systab, "EFI handle %p systab %p\n", image_handle, systab );
/* Look up required protocols */
/* Look up used protocols */
bs = systab->BootServices;
for ( prot = efi_protocols ; prot < efi_protocols_end ; prot++ ) {
if ( ( efirc = bs->LocateProtocol ( &prot->u.guid, NULL,
prot->protocol ) ) != 0 ) {
prot->protocol ) ) == 0 ) {
DBGC ( systab, "EFI protocol %s is at %p\n",
uuid_ntoa ( &prot->u.uuid ), *(prot->protocol));
} else {
DBGC ( systab, "EFI does not provide protocol %s\n",
uuid_ntoa ( &prot->u.uuid ) );
/* All protocols are required */
return efirc;
}
DBGC ( systab, "EFI protocol %s is at %p\n",
uuid_ntoa ( &prot->u.uuid ), *(prot->protocol) );
}
/* Look up used configuration tables */
for ( tab = efi_config_tables ; tab < efi_config_tables_end ; tab++ ) {
if ( ( *(tab->table) = efi_find_table ( &tab->u.guid ) ) ) {
DBGC ( systab, "EFI configuration table %s is at %p\n",
uuid_ntoa ( &tab->u.uuid ), *(tab->table) );
} else {
DBGC ( systab, "EFI does not provide configuration "
"table %s\n", uuid_ntoa ( &tab->u.uuid ) );
if ( tab->required )
return EFI_NOT_AVAILABLE_YET;
}
}
/* Call to main() */