/* SPDX-License-Identifier: GPL-2.0-only */ #include <console/console.h> #include <cpu/x86/msr.h> #include <cpu/intel/msr.h> #include <device/mmio.h> #include <stdint.h> #include <security/intel/txt/txt.h> #include "cbnt.h" #define LOG(...) printk(BIOS_INFO, "CBnT: " __VA_ARGS__) union sacm_info { struct { uint64_t nem_enabled : 1; uint64_t tpm_type : 2; uint64_t tpm_success : 1; uint64_t facb : 1; uint64_t measured_boot : 1; uint64_t verified_boot : 1; uint64_t revoked : 1; uint64_t : 24; uint64_t btg_cap : 1; uint64_t : 1; uint64_t txt_cap : 1; uint64_t : 29; }; msr_t msr; uint64_t raw; }; _Static_assert(sizeof(union sacm_info) == sizeof(uint64_t), "Wrong size of sacm_info"); static const char *const tpm_type[] = { "No TPM", "TPM 1.2", "TPM 2.0", "PTT", }; union cbnt_bootstatus { struct { uint64_t : 59; uint64_t bios_trusted : 1; uint64_t txt_dis_pol : 1; uint64_t btg_startup_err : 1; uint64_t txt_err : 1; uint64_t type7 : 1; }; uint64_t raw; }; _Static_assert(sizeof(union cbnt_bootstatus) == sizeof(uint64_t), "Wrong size of cbnt_bootstatus"); union cbnt_errorcode { struct { uint32_t type : 15; uint32_t : 15; uint32_t external : 1; uint32_t valid : 1; } microcode; struct { uint32_t ac_type : 4; uint32_t class : 6; uint32_t major : 5; uint32_t minor_invalid : 1; uint32_t minor : 9; uint32_t : 5; uint32_t external : 1; uint32_t valid : 1; } sinit; uint32_t raw; }; _Static_assert(sizeof(union cbnt_errorcode) == sizeof(uint32_t), "Wrong size of cbnt_errorcode"); union cbnt_biosacm_errorcode { struct { uint32_t ac_type : 4; uint32_t class : 6; uint32_t major : 5; uint32_t minor_invalid : 1; uint32_t minor : 12; uint32_t : 2; uint32_t external : 1; uint32_t valid : 1; } txt; struct { uint32_t ac_type : 4; uint32_t class : 6; uint32_t error : 5; uint32_t acm_started : 1; uint32_t km_id : 4; uint32_t bp : 5; uint32_t : 6; uint32_t valid : 1; } btg; uint32_t raw; }; _Static_assert(sizeof(union cbnt_biosacm_errorcode) == sizeof(uint32_t), "Wrong size of cbnt_biosacm_errorcode"); static const char *decode_err_type(uint8_t type) { switch (type) { case 0: return "BIOS ACM Error"; case 1: return "SINIT ACM Error"; case 3: return "Boot Guard Error"; default: return "Reserved"; } } void intel_cbnt_log_registers(void) { const union sacm_info acm_info = { .msr = rdmsr(MSR_BOOT_GUARD_SACM_INFO) }; LOG("SACM INFO MSR (0x13A) raw: 0x%016llx\n", acm_info.raw); LOG(" NEM status: %u\n", acm_info.nem_enabled); LOG(" TPM type: %s\n", tpm_type[acm_info.tpm_type]); LOG(" TPM success: %u\n", acm_info.tpm_success); LOG(" FACB: %u\n", acm_info.facb); LOG(" measured boot: %u\n", acm_info.measured_boot); LOG(" verified boot: %u\n", acm_info.verified_boot); LOG(" revoked: %u\n", acm_info.revoked); LOG(" BtG capable: %u\n", acm_info.btg_cap); LOG(" TXT capable: %u\n", acm_info.txt_cap); const union cbnt_bootstatus btsts = { .raw = read64p(CBNT_BOOTSTATUS), }; LOG("BOOTSTATUS (0xA0) raw: 0x%016llx\n", btsts.raw); LOG(" Bios trusted: %u\n", btsts.bios_trusted); LOG(" TXT disabled by policy: %u\n", btsts.txt_dis_pol); LOG(" Bootguard startup error: %u\n", btsts.btg_startup_err); LOG(" TXT ucode or ACM error: %u\n", btsts.txt_err); LOG(" TXT measurement type 7: %u\n", btsts.type7); const union cbnt_errorcode err = { .raw = read32p(CBNT_ERRORCODE), }; LOG("ERRORCODE (0x30) raw: 0x%08x\n", err.raw); /* It looks like the hardware does not set the txt error bit properly */ const bool txt_err_valid = btsts.txt_err || true; if (txt_err_valid && !btsts.txt_dis_pol) { if (err.microcode.valid && !err.microcode.external) { LOG("ERRORCODE is ucode error\n"); LOG(" type: %s\n", intel_txt_processor_error_type(err.microcode.type)); } else if (err.sinit.valid && err.sinit.external) { LOG("ERRORCODE is SINIT error\n"); const char *type = decode_err_type(err.sinit.ac_type); LOG(" AC Module Type: %s\n", type); LOG(" class: 0x%x\n", err.sinit.class); LOG(" major: 0x%x\n", err.sinit.major); if (!err.sinit.minor_invalid) LOG(" minor: 0x%x\n", err.sinit.minor); } } else if (txt_err_valid && btsts.txt_dis_pol) { LOG("TXT disabled in Policy\n"); } const union cbnt_biosacm_errorcode biosacm_err = { .raw = read32p(CBNT_BIOSACM_ERRORCODE), }; LOG("BIOSACM_ERRORCODE (0x328) raw: 0x%08x\n", biosacm_err.raw); if (txt_err_valid && biosacm_err.txt.valid) { LOG("BIOSACM_ERRORCODE: TXT ucode or ACM error\n"); const char *type = decode_err_type(biosacm_err.txt.ac_type); LOG(" AC Module Type: %s\n", type); LOG(" class: 0x%x\n", biosacm_err.txt.class); LOG(" major: 0x%x\n", biosacm_err.txt.major); if (!biosacm_err.txt.minor_invalid) LOG(" minor: 0x%x\n", biosacm_err.txt.minor); LOG(" External: 0x%x\n", biosacm_err.txt.external); } if (btsts.btg_startup_err && biosacm_err.btg.valid) { LOG("BIOSACM_ERRORCODE: Bootguard error\n"); const char *type = decode_err_type(biosacm_err.btg.ac_type); LOG(" AC Module Type: %s\n", type); LOG(" class: 0x%x\n", biosacm_err.btg.class); LOG(" error: 0x%x\n", biosacm_err.btg.error); LOG(" ACM started: %u\n", biosacm_err.btg.acm_started); LOG(" KMID: 0x%x\n", biosacm_err.btg.km_id); LOG(" BootPolicies: 0x%x\n", biosacm_err.btg.bp); } }