1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2017 Google, Inc.
4 * Thiebaud Weksteen <tweek@google.com>
7 #define TPM_MEMREMAP(start, size) early_memremap(start, size)
8 #define TPM_MEMUNMAP(start, size) early_memunmap(start, size)
10 #include <asm/early_ioremap.h>
11 #include <linux/efi.h>
12 #include <linux/init.h>
13 #include <linux/memblock.h>
14 #include <linux/tpm_eventlog.h>
16 int efi_tpm_final_log_size;
17 EXPORT_SYMBOL(efi_tpm_final_log_size);
19 static int tpm2_calc_event_log_size(void *data, int count, void *size_info)
21 struct tcg_pcr_event2_head *header;
22 int event_size, size = 0;
26 event_size = __calc_tpm2_event_size(header, size_info, true);
37 * Reserve the memory associated with the TPM Event Log configuration table.
39 int __init efi_tpm_eventlog_init(void)
41 struct linux_efi_tpm_eventlog *log_tbl;
42 struct efi_tcg2_final_events_table *final_tbl;
43 unsigned int tbl_size;
46 if (efi.tpm_log == EFI_INVALID_TABLE_ADDR) {
48 * We can't calculate the size of the final events without the
49 * first entry in the TPM log, so bail here.
54 log_tbl = early_memremap(efi.tpm_log, sizeof(*log_tbl));
56 pr_err("Failed to map TPM Event Log table @ 0x%lx\n",
58 efi.tpm_log = EFI_INVALID_TABLE_ADDR;
62 tbl_size = sizeof(*log_tbl) + log_tbl->size;
63 memblock_reserve(efi.tpm_log, tbl_size);
65 if (efi.tpm_final_log == EFI_INVALID_TABLE_ADDR)
68 final_tbl = early_memremap(efi.tpm_final_log, sizeof(*final_tbl));
71 pr_err("Failed to map TPM Final Event Log table @ 0x%lx\n",
73 efi.tpm_final_log = EFI_INVALID_TABLE_ADDR;
78 tbl_size = tpm2_calc_event_log_size((void *)efi.tpm_final_log
79 + sizeof(final_tbl->version)
80 + sizeof(final_tbl->nr_events),
83 memblock_reserve((unsigned long)final_tbl,
84 tbl_size + sizeof(*final_tbl));
85 early_memunmap(final_tbl, sizeof(*final_tbl));
86 efi_tpm_final_log_size = tbl_size;
89 early_memunmap(log_tbl, sizeof(*log_tbl));