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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Copyright (C) 2017 Google, Inc.
- * Thiebaud Weksteen <[email protected]>
- */
- #define TPM_MEMREMAP(start, size) early_memremap(start, size)
- #define TPM_MEMUNMAP(start, size) early_memunmap(start, size)
- #include <asm/early_ioremap.h>
- #include <linux/efi.h>
- #include <linux/init.h>
- #include <linux/memblock.h>
- #include <linux/tpm_eventlog.h>
- int efi_tpm_final_log_size;
- EXPORT_SYMBOL(efi_tpm_final_log_size);
- static int __init tpm2_calc_event_log_size(void *data, int count, void *size_info)
- {
- struct tcg_pcr_event2_head *header;
- int event_size, size = 0;
- while (count > 0) {
- header = data + size;
- event_size = __calc_tpm2_event_size(header, size_info, true);
- if (event_size == 0)
- return -1;
- size += event_size;
- count--;
- }
- return size;
- }
- /*
- * Reserve the memory associated with the TPM Event Log configuration table.
- */
- int __init efi_tpm_eventlog_init(void)
- {
- struct linux_efi_tpm_eventlog *log_tbl;
- struct efi_tcg2_final_events_table *final_tbl;
- int tbl_size;
- int ret = 0;
- if (efi.tpm_log == EFI_INVALID_TABLE_ADDR) {
- /*
- * We can't calculate the size of the final events without the
- * first entry in the TPM log, so bail here.
- */
- return 0;
- }
- log_tbl = early_memremap(efi.tpm_log, sizeof(*log_tbl));
- if (!log_tbl) {
- pr_err("Failed to map TPM Event Log table @ 0x%lx\n",
- efi.tpm_log);
- efi.tpm_log = EFI_INVALID_TABLE_ADDR;
- return -ENOMEM;
- }
- tbl_size = sizeof(*log_tbl) + log_tbl->size;
- memblock_reserve(efi.tpm_log, tbl_size);
- if (efi.tpm_final_log == EFI_INVALID_TABLE_ADDR) {
- pr_info("TPM Final Events table not present\n");
- goto out;
- } else if (log_tbl->version != EFI_TCG2_EVENT_LOG_FORMAT_TCG_2) {
- pr_warn(FW_BUG "TPM Final Events table invalid\n");
- goto out;
- }
- final_tbl = early_memremap(efi.tpm_final_log, sizeof(*final_tbl));
- if (!final_tbl) {
- pr_err("Failed to map TPM Final Event Log table @ 0x%lx\n",
- efi.tpm_final_log);
- efi.tpm_final_log = EFI_INVALID_TABLE_ADDR;
- ret = -ENOMEM;
- goto out;
- }
- tbl_size = 0;
- if (final_tbl->nr_events != 0) {
- void *events = (void *)efi.tpm_final_log
- + sizeof(final_tbl->version)
- + sizeof(final_tbl->nr_events);
- tbl_size = tpm2_calc_event_log_size(events,
- final_tbl->nr_events,
- log_tbl->log);
- }
- if (tbl_size < 0) {
- pr_err(FW_BUG "Failed to parse event in TPM Final Events Log\n");
- ret = -EINVAL;
- goto out_calc;
- }
- memblock_reserve(efi.tpm_final_log,
- tbl_size + sizeof(*final_tbl));
- efi_tpm_final_log_size = tbl_size;
- out_calc:
- early_memunmap(final_tbl, sizeof(*final_tbl));
- out:
- early_memunmap(log_tbl, sizeof(*log_tbl));
- return ret;
- }
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