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[linux] Provide access to SMBIOS via /dev/mem

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2013-12-05 03:15:53 +00:00
parent 2f1c7e386b
commit 03957bcb47
4 changed files with 149 additions and 49 deletions
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52
src/arch/i386/interface/pcbios/bios_smbios.c
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@@ -41,49 +41,21 @@ FILE_LICENCE ( GPL2_OR_LATER );
* @ret rc Return status code
*/
static int bios_find_smbios ( struct smbios *smbios ) {
union {
struct smbios_entry entry;
uint8_t bytes[256]; /* 256 is maximum length possible */
} u;
static unsigned int offset = 0;
size_t len;
unsigned int i;
uint8_t sum;
struct smbios_entry entry;
int rc;
/* Try to find SMBIOS */
for ( ; offset < 0x10000 ; offset += 0x10 ) {
/* Scan through BIOS segment to find SMBIOS entry point */
if ( ( rc = find_smbios_entry ( real_to_user ( BIOS_SEG, 0 ), 0x10000,
&entry ) ) != 0 )
return rc;
/* Read start of header and verify signature */
copy_from_real ( &u.entry, BIOS_SEG, offset,
sizeof ( u.entry ));
if ( u.entry.signature != SMBIOS_SIGNATURE )
continue;
/* Fill in entry point descriptor structure */
smbios->address = phys_to_user ( entry.smbios_address );
smbios->len = entry.smbios_len;
smbios->count = entry.smbios_count;
smbios->version = SMBIOS_VERSION ( entry.major, entry.minor );
/* Read whole header and verify checksum */
len = u.entry.len;
copy_from_real ( &u.bytes, BIOS_SEG, offset, len );
for ( i = 0 , sum = 0 ; i < len ; i++ ) {
sum += u.bytes[i];
}
if ( sum != 0 ) {
DBG ( "SMBIOS at %04x:%04x has bad checksum %02x\n",
BIOS_SEG, offset, sum );
continue;
}
/* Fill result structure */
DBG ( "Found SMBIOS v%d.%d entry point at %04x:%04x\n",
u.entry.major, u.entry.minor, BIOS_SEG, offset );
smbios->address = phys_to_user ( u.entry.smbios_address );
smbios->len = u.entry.smbios_len;
smbios->count = u.entry.smbios_count;
smbios->version =
SMBIOS_VERSION ( u.entry.major, u.entry.minor );
return 0;
}
DBG ( "No SMBIOS found\n" );
return -ENODEV;
return 0;
}
PROVIDE_SMBIOS ( pcbios, find_smbios, bios_find_smbios );