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[smbios] Support scanning for the 64-bit SMBIOS3 entry point

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Support scanning for the 64-bit SMBIOS3 entry point in addition to the
32-bit SMBIOS2 entry point.

Prefer use of the 32-bit entry point if present, since this is
guaranteed to be within accessible memory.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2023-12-29 19:38:12 +00:00
parent 119c415ee4
commit fa62213231
3 changed files with 120 additions and 15 deletions
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55
src/arch/x86/interface/pcbios/bios_smbios.c
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@@ -44,11 +44,11 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
* @v smbios SMBIOS entry point descriptor structure to fill in
* @ret rc Return status code
*/
static int bios_find_smbios ( struct smbios *smbios ) {
static int bios_find_smbios2 ( struct smbios *smbios ) {
struct smbios_entry entry;
int rc;
/* Scan through BIOS segment to find SMBIOS entry point */
/* Scan through BIOS segment to find SMBIOS 32-bit entry point */
if ( ( rc = find_smbios_entry ( real_to_user ( BIOS_SEG, 0 ), 0x10000,
&entry ) ) != 0 )
return rc;
@@ -62,4 +62,55 @@ static int bios_find_smbios ( struct smbios *smbios ) {
return 0;
}
/**
* Find SMBIOS
*
* @v smbios SMBIOS entry point descriptor structure to fill in
* @ret rc Return status code
*/
static int bios_find_smbios3 ( struct smbios *smbios ) {
struct smbios3_entry entry;
int rc;
/* Scan through BIOS segment to find SMBIOS 64-bit entry point */
if ( ( rc = find_smbios3_entry ( real_to_user ( BIOS_SEG, 0 ), 0x10000,
&entry ) ) != 0 )
return rc;
/* Check that address is accessible */
if ( entry.smbios_address > ~( ( physaddr_t ) 0 ) ) {
DBG ( "SMBIOS3 at %08llx is inaccessible\n",
( ( unsigned long long ) entry.smbios_address ) );
return -ENOTSUP;
}
/* Fill in entry point descriptor structure */
smbios->address = phys_to_user ( entry.smbios_address );
smbios->len = entry.smbios_len;
smbios->count = 0;
smbios->version = SMBIOS_VERSION ( entry.major, entry.minor );
return 0;
}
/**
* Find SMBIOS
*
* @v smbios SMBIOS entry point descriptor structure to fill in
* @ret rc Return status code
*/
static int bios_find_smbios ( struct smbios *smbios ) {
int rc;
/* Use 32-bit table if present */
if ( ( rc = bios_find_smbios2 ( smbios ) ) == 0 )
return 0;
/* Otherwise, use 64-bit table if present and accessible */
if ( ( rc = bios_find_smbios3 ( smbios ) ) == 0 )
return 0;
return rc;
}
PROVIDE_SMBIOS ( pcbios, find_smbios, bios_find_smbios );