Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / char / tpm / tpm_acpi.c

diff --git a/kernel/drivers/char/tpm/tpm_acpi.c b/kernel/drivers/char/tpm/tpm_acpi.c
new file mode 100644 (file)
index 0000000..565a947
--- /dev/null
+++ b/kernel/drivers/char/tpm/tpm_acpi.c
@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2005 IBM Corporation
+ *
+ * Authors:
+ *     Seiji Munetoh <munetoh@jp.ibm.com>
+ *     Stefan Berger <stefanb@us.ibm.com>
+ *     Reiner Sailer <sailer@watson.ibm.com>
+ *     Kylene Hall <kjhall@us.ibm.com>
+ *
+ * Maintained by: <tpmdd-devel@lists.sourceforge.net>
+ *
+ * Access to the eventlog extended by the TCG BIOS of PC platform
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <linux/seq_file.h>
+#include <linux/fs.h>
+#include <linux/security.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/acpi.h>
+
+#include "tpm.h"
+#include "tpm_eventlog.h"
+
+struct acpi_tcpa {
+       struct acpi_table_header hdr;
+       u16 platform_class;
+       union {
+               struct client_hdr {
+                       u32 log_max_len __packed;
+                       u64 log_start_addr __packed;
+               } client;
+               struct server_hdr {
+                       u16 reserved;
+                       u64 log_max_len __packed;
+                       u64 log_start_addr __packed;
+               } server;
+       };
+};
+
+/* read binary bios log */
+int read_log(struct tpm_bios_log *log)
+{
+       struct acpi_tcpa *buff;
+       acpi_status status;
+       void __iomem *virt;
+       u64 len, start;
+
+       if (log->bios_event_log != NULL) {
+               printk(KERN_ERR
+                      "%s: ERROR - Eventlog already initialized\n",
+                      __func__);
+               return -EFAULT;
+       }
+
+       /* Find TCPA entry in RSDT (ACPI_LOGICAL_ADDRESSING) */
+       status = acpi_get_table(ACPI_SIG_TCPA, 1,
+                               (struct acpi_table_header **)&buff);
+
+       if (ACPI_FAILURE(status)) {
+               printk(KERN_ERR "%s: ERROR - Could not get TCPA table\n",
+                      __func__);
+               return -EIO;
+       }
+
+       switch(buff->platform_class) {
+       case BIOS_SERVER:
+               len = buff->server.log_max_len;
+               start = buff->server.log_start_addr;
+               break;
+       case BIOS_CLIENT:
+       default:
+               len = buff->client.log_max_len;
+               start = buff->client.log_start_addr;
+               break;
+       }
+       if (!len) {
+               printk(KERN_ERR "%s: ERROR - TCPA log area empty\n", __func__);
+               return -EIO;
+       }
+
+       /* malloc EventLog space */
+       log->bios_event_log = kmalloc(len, GFP_KERNEL);
+       if (!log->bios_event_log) {
+               printk("%s: ERROR - Not enough  Memory for BIOS measurements\n",
+                       __func__);
+               return -ENOMEM;
+       }
+
+       log->bios_event_log_end = log->bios_event_log + len;
+
+       virt = acpi_os_map_iomem(start, len);
+       if (!virt) {
+               kfree(log->bios_event_log);
+               printk("%s: ERROR - Unable to map memory\n", __func__);
+               return -EIO;
+       }
+
+       memcpy_fromio(log->bios_event_log, virt, len);
+
+       acpi_os_unmap_iomem(virt, len);
+       return 0;
+}