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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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78
src/interface/smbios/smbios.c
View File

@@ -42,7 +42,27 @@ static struct smbios smbios = {
};
/**
* Scan for SMBIOS entry point structure
* Calculate SMBIOS entry point structure checksum
*
* @v start Start address of region
* @v offset Offset of SMBIOS entry point structure
* @v len Length of entry point structure
* @ret sum Byte checksum
*/
static uint8_t smbios_checksum ( userptr_t start, size_t offset, size_t len ) {
size_t end = ( offset + len );
uint8_t sum;
uint8_t byte;
for ( sum = 0 ; offset < end ; offset++ ) {
copy_from_user ( &byte, start, offset, sizeof ( byte ) );
sum += byte;
}
return sum;
}
/**
* Scan for SMBIOS 32-bit entry point structure
*
* @v start Start address of region to scan
* @v len Length of region to scan
@@ -51,28 +71,20 @@ static struct smbios smbios = {
*/
int find_smbios_entry ( userptr_t start, size_t len,
struct smbios_entry *entry ) {
uint8_t buf[256]; /* 256 is maximum length possible */
static size_t offset = 0; /* Avoid repeated attempts to locate SMBIOS */
size_t entry_len;
unsigned int i;
uint8_t sum;
/* Try to find SMBIOS */
for ( ; offset < len ; offset += 0x10 ) {
for ( ; ( offset + sizeof ( *entry ) ) <= len ; offset += 0x10 ) {
/* Read start of header and verify signature */
copy_from_user ( entry, start, offset, sizeof ( *entry ) );
if ( entry->signature != SMBIOS_SIGNATURE )
continue;
/* Read whole header and verify checksum */
entry_len = entry->len;
assert ( entry_len <= sizeof ( buf ) );
copy_from_user ( buf, start, offset, entry_len );
for ( i = 0, sum = 0 ; i < entry_len ; i++ ) {
sum += buf[i];
}
if ( sum != 0 ) {
/* Verify checksum */
if ( ( sum = smbios_checksum ( start, offset,
entry->len ) ) != 0 ) {
DBG ( "SMBIOS at %08lx has bad checksum %02x\n",
user_to_phys ( start, offset ), sum );
continue;
@@ -89,6 +101,46 @@ int find_smbios_entry ( userptr_t start, size_t len,
return -ENODEV;
}
/**
* Scan for SMBIOS 64-bit entry point structure
*
* @v start Start address of region to scan
* @v len Length of region to scan
* @v entry SMBIOS entry point structure to fill in
* @ret rc Return status code
*/
int find_smbios3_entry ( userptr_t start, size_t len,
struct smbios3_entry *entry ) {
static size_t offset = 0; /* Avoid repeated attempts to locate SMBIOS */
uint8_t sum;
/* Try to find SMBIOS */
for ( ; ( offset + sizeof ( *entry ) ) <= len ; offset += 0x10 ) {
/* Read start of header and verify signature */
copy_from_user ( entry, start, offset, sizeof ( *entry ) );
if ( entry->signature != SMBIOS3_SIGNATURE )
continue;
/* Verify checksum */
if ( ( sum = smbios_checksum ( start, offset,
entry->len ) ) != 0 ) {
DBG ( "SMBIOS3 at %08lx has bad checksum %02x\n",
user_to_phys ( start, offset ), sum );
continue;
}
/* Fill result structure */
DBG ( "Found SMBIOS3 v%d.%d entry point at %08lx\n",
entry->major, entry->minor,
user_to_phys ( start, offset ) );
return 0;
}
DBG ( "No SMBIOS3 found\n" );
return -ENODEV;
}
/**
* Find SMBIOS strings terminator
*