diff options
Diffstat (limited to 'src/arch/x86/acpi.c')
| -rw-r--r-- | src/arch/x86/acpi.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/src/arch/x86/acpi.c b/src/arch/x86/acpi.c index f54aa19271..3b33f1ba7f 100644 --- a/src/arch/x86/acpi.c +++ b/src/arch/x86/acpi.c @@ -308,12 +308,47 @@ static void acpi_create_tcpa(acpi_tcpa_t *tcpa) header->checksum = acpi_checksum((void *)tcpa, header->length); } +static void *get_tpm2_log(u32 *size) +{ + const struct cbmem_entry *ce; + const u32 tpm2_default_log_len = 0x10000; + void *lasa; + ce = cbmem_entry_find(CBMEM_ID_TPM2_TCG_LOG); + if (ce) { + lasa = cbmem_entry_start(ce); + *size = cbmem_entry_size(ce); + printk(BIOS_DEBUG, "TPM2 log found at %p\n", lasa); + return lasa; + } + lasa = cbmem_add(CBMEM_ID_TPM2_TCG_LOG, tpm2_default_log_len); + if (!lasa) { + printk(BIOS_ERR, "TPM2 log creation failed\n"); + return NULL; + } + + printk(BIOS_DEBUG, "TPM2 log created at %p\n", lasa); + memset(lasa, 0, tpm2_default_log_len); + + *size = tpm2_default_log_len; + return lasa; +} + static void acpi_create_tpm2(acpi_tpm2_t *tpm2) { acpi_header_t *header = &(tpm2->header); + u32 tpm2_log_len; + void *lasa; memset((void *)tpm2, 0, sizeof(acpi_tpm2_t)); + /* + * Some payloads like SeaBIOS depend on log area to use TPM2. + * Get the memory size and address of TPM2 log area or initialize it. + */ + lasa = get_tpm2_log(&tpm2_log_len); + if (!lasa) + tpm2_log_len = 0; + /* Fill out header fields. */ memcpy(header->signature, "TPM2", 4); memcpy(header->oem_id, OEM_ID, 6); @@ -331,6 +366,10 @@ static void acpi_create_tpm2(acpi_tpm2_t *tpm2) tpm2->start_method = 6; memset(tpm2->msp, 0, sizeof(tpm2->msp)); + /* Fill the log area size and start address fields. */ + tpm2->laml = tpm2_log_len; + tpm2->lasa = (uintptr_t) lasa; + /* Calculate checksum. */ header->checksum = acpi_checksum((void *)tpm2, header->length); } |