| /* |
| * Copyright (C) 2004 IBM Corporation |
| * Copyright (C) 2015 Intel Corporation |
| * |
| * Authors: |
| * Leendert van Doorn <leendert@watson.ibm.com> |
| * Dave Safford <safford@watson.ibm.com> |
| * Reiner Sailer <sailer@watson.ibm.com> |
| * Kylene Hall <kjhall@us.ibm.com> |
| * |
| * Maintained by: <tpmdd-devel@lists.sourceforge.net> |
| * |
| * Device driver for TCG/TCPA TPM (trusted platform module). |
| * Specifications at www.trustedcomputinggroup.org |
| * |
| * 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, version 2 of the |
| * License. |
| * |
| */ |
| #include <linux/module.h> |
| #include <linux/delay.h> |
| #include <linux/fs.h> |
| #include <linux/mutex.h> |
| #include <linux/sched.h> |
| #include <linux/platform_device.h> |
| #include <linux/io.h> |
| #include <linux/tpm.h> |
| #include <linux/acpi.h> |
| #include <linux/cdev.h> |
| #include <linux/highmem.h> |
| |
| enum tpm_const { |
| TPM_MINOR = 224, /* officially assigned */ |
| TPM_BUFSIZE = 4096, |
| TPM_NUM_DEVICES = 256, |
| TPM_RETRY = 50, /* 5 seconds */ |
| }; |
| |
| enum tpm_timeout { |
| TPM_TIMEOUT = 5, /* msecs */ |
| TPM_TIMEOUT_RETRY = 100 /* msecs */ |
| }; |
| |
| /* TPM addresses */ |
| enum tpm_addr { |
| TPM_SUPERIO_ADDR = 0x2E, |
| TPM_ADDR = 0x4E, |
| }; |
| |
| /* Indexes the duration array */ |
| enum tpm_duration { |
| TPM_SHORT = 0, |
| TPM_MEDIUM = 1, |
| TPM_LONG = 2, |
| TPM_UNDEFINED, |
| }; |
| |
| #define TPM_WARN_RETRY 0x800 |
| #define TPM_WARN_DOING_SELFTEST 0x802 |
| #define TPM_ERR_DEACTIVATED 0x6 |
| #define TPM_ERR_DISABLED 0x7 |
| #define TPM_ERR_INVALID_POSTINIT 38 |
| |
| #define TPM_HEADER_SIZE 10 |
| |
| enum tpm2_const { |
| TPM2_PLATFORM_PCR = 24, |
| TPM2_PCR_SELECT_MIN = ((TPM2_PLATFORM_PCR + 7) / 8), |
| TPM2_TIMEOUT_A = 750, |
| TPM2_TIMEOUT_B = 2000, |
| TPM2_TIMEOUT_C = 200, |
| TPM2_TIMEOUT_D = 30, |
| TPM2_DURATION_SHORT = 20, |
| TPM2_DURATION_MEDIUM = 750, |
| TPM2_DURATION_LONG = 2000, |
| }; |
| |
| enum tpm2_structures { |
| TPM2_ST_NO_SESSIONS = 0x8001, |
| TPM2_ST_SESSIONS = 0x8002, |
| }; |
| |
| enum tpm2_return_codes { |
| TPM2_RC_INITIALIZE = 0x0100, |
| TPM2_RC_TESTING = 0x090A, |
| TPM2_RC_DISABLED = 0x0120, |
| }; |
| |
| enum tpm2_algorithms { |
| TPM2_ALG_SHA1 = 0x0004, |
| TPM2_ALG_KEYEDHASH = 0x0008, |
| TPM2_ALG_SHA256 = 0x000B, |
| TPM2_ALG_NULL = 0x0010 |
| }; |
| |
| enum tpm2_command_codes { |
| TPM2_CC_FIRST = 0x011F, |
| TPM2_CC_SELF_TEST = 0x0143, |
| TPM2_CC_STARTUP = 0x0144, |
| TPM2_CC_SHUTDOWN = 0x0145, |
| TPM2_CC_CREATE = 0x0153, |
| TPM2_CC_LOAD = 0x0157, |
| TPM2_CC_UNSEAL = 0x015E, |
| TPM2_CC_FLUSH_CONTEXT = 0x0165, |
| TPM2_CC_GET_CAPABILITY = 0x017A, |
| TPM2_CC_GET_RANDOM = 0x017B, |
| TPM2_CC_PCR_READ = 0x017E, |
| TPM2_CC_PCR_EXTEND = 0x0182, |
| TPM2_CC_LAST = 0x018F, |
| }; |
| |
| enum tpm2_permanent_handles { |
| TPM2_RS_PW = 0x40000009, |
| }; |
| |
| enum tpm2_capabilities { |
| TPM2_CAP_TPM_PROPERTIES = 6, |
| }; |
| |
| enum tpm2_startup_types { |
| TPM2_SU_CLEAR = 0x0000, |
| TPM2_SU_STATE = 0x0001, |
| }; |
| |
| enum tpm2_start_method { |
| TPM2_START_ACPI = 2, |
| TPM2_START_FIFO = 6, |
| TPM2_START_CRB = 7, |
| TPM2_START_CRB_WITH_ACPI = 8, |
| }; |
| |
| struct tpm_chip; |
| |
| struct tpm_vendor_specific { |
| void __iomem *iobase; /* ioremapped address */ |
| unsigned long base; /* TPM base address */ |
| |
| int irq; |
| int probed_irq; |
| |
| int region_size; |
| int have_region; |
| |
| struct list_head list; |
| int locality; |
| unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */ |
| bool timeout_adjusted; |
| unsigned long duration[3]; /* jiffies */ |
| bool duration_adjusted; |
| void *priv; |
| |
| wait_queue_head_t read_queue; |
| wait_queue_head_t int_queue; |
| |
| u16 manufacturer_id; |
| }; |
| |
| #define TPM_VPRIV(c) ((c)->vendor.priv) |
| |
| #define TPM_VID_INTEL 0x8086 |
| #define TPM_VID_WINBOND 0x1050 |
| #define TPM_VID_STM 0x104A |
| |
| #define TPM_PPI_VERSION_LEN 3 |
| |
| enum tpm_chip_flags { |
| TPM_CHIP_FLAG_REGISTERED = BIT(0), |
| TPM_CHIP_FLAG_TPM2 = BIT(1), |
| }; |
| |
| struct tpm_chip { |
| struct device *pdev; /* Device stuff */ |
| struct device dev; |
| struct cdev cdev; |
| |
| const struct tpm_class_ops *ops; |
| unsigned int flags; |
| |
| int dev_num; /* /dev/tpm# */ |
| char devname[7]; |
| unsigned long is_open; /* only one allowed */ |
| int time_expired; |
| |
| struct mutex tpm_mutex; /* tpm is processing */ |
| |
| struct tpm_vendor_specific vendor; |
| |
| struct dentry **bios_dir; |
| |
| #ifdef CONFIG_ACPI |
| const struct attribute_group *groups[2]; |
| unsigned int groups_cnt; |
| acpi_handle acpi_dev_handle; |
| char ppi_version[TPM_PPI_VERSION_LEN + 1]; |
| #endif /* CONFIG_ACPI */ |
| |
| struct list_head list; |
| }; |
| |
| #define to_tpm_chip(d) container_of(d, struct tpm_chip, dev) |
| |
| static inline void tpm_chip_put(struct tpm_chip *chip) |
| { |
| module_put(chip->pdev->driver->owner); |
| } |
| |
| static inline int tpm_read_index(int base, int index) |
| { |
| outb(index, base); |
| return inb(base+1) & 0xFF; |
| } |
| |
| static inline void tpm_write_index(int base, int index, int value) |
| { |
| outb(index, base); |
| outb(value & 0xFF, base+1); |
| } |
| struct tpm_input_header { |
| __be16 tag; |
| __be32 length; |
| __be32 ordinal; |
| } __packed; |
| |
| struct tpm_output_header { |
| __be16 tag; |
| __be32 length; |
| __be32 return_code; |
| } __packed; |
| |
| #define TPM_TAG_RQU_COMMAND cpu_to_be16(193) |
| |
| struct stclear_flags_t { |
| __be16 tag; |
| u8 deactivated; |
| u8 disableForceClear; |
| u8 physicalPresence; |
| u8 physicalPresenceLock; |
| u8 bGlobalLock; |
| } __packed; |
| |
| struct tpm_version_t { |
| u8 Major; |
| u8 Minor; |
| u8 revMajor; |
| u8 revMinor; |
| } __packed; |
| |
| struct tpm_version_1_2_t { |
| __be16 tag; |
| u8 Major; |
| u8 Minor; |
| u8 revMajor; |
| u8 revMinor; |
| } __packed; |
| |
| struct timeout_t { |
| __be32 a; |
| __be32 b; |
| __be32 c; |
| __be32 d; |
| } __packed; |
| |
| struct duration_t { |
| __be32 tpm_short; |
| __be32 tpm_medium; |
| __be32 tpm_long; |
| } __packed; |
| |
| struct permanent_flags_t { |
| __be16 tag; |
| u8 disable; |
| u8 ownership; |
| u8 deactivated; |
| u8 readPubek; |
| u8 disableOwnerClear; |
| u8 allowMaintenance; |
| u8 physicalPresenceLifetimeLock; |
| u8 physicalPresenceHWEnable; |
| u8 physicalPresenceCMDEnable; |
| u8 CEKPUsed; |
| u8 TPMpost; |
| u8 TPMpostLock; |
| u8 FIPS; |
| u8 operator; |
| u8 enableRevokeEK; |
| u8 nvLocked; |
| u8 readSRKPub; |
| u8 tpmEstablished; |
| u8 maintenanceDone; |
| u8 disableFullDALogicInfo; |
| } __packed; |
| |
| typedef union { |
| struct permanent_flags_t perm_flags; |
| struct stclear_flags_t stclear_flags; |
| bool owned; |
| __be32 num_pcrs; |
| struct tpm_version_t tpm_version; |
| struct tpm_version_1_2_t tpm_version_1_2; |
| __be32 manufacturer_id; |
| struct timeout_t timeout; |
| struct duration_t duration; |
| } cap_t; |
| |
| enum tpm_capabilities { |
| TPM_CAP_FLAG = cpu_to_be32(4), |
| TPM_CAP_PROP = cpu_to_be32(5), |
| CAP_VERSION_1_1 = cpu_to_be32(0x06), |
| CAP_VERSION_1_2 = cpu_to_be32(0x1A) |
| }; |
| |
| enum tpm_sub_capabilities { |
| TPM_CAP_PROP_PCR = cpu_to_be32(0x101), |
| TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103), |
| TPM_CAP_FLAG_PERM = cpu_to_be32(0x108), |
| TPM_CAP_FLAG_VOL = cpu_to_be32(0x109), |
| TPM_CAP_PROP_OWNER = cpu_to_be32(0x111), |
| TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115), |
| TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120), |
| |
| }; |
| |
| struct tpm_getcap_params_in { |
| __be32 cap; |
| __be32 subcap_size; |
| __be32 subcap; |
| } __packed; |
| |
| struct tpm_getcap_params_out { |
| __be32 cap_size; |
| cap_t cap; |
| } __packed; |
| |
| struct tpm_readpubek_params_out { |
| u8 algorithm[4]; |
| u8 encscheme[2]; |
| u8 sigscheme[2]; |
| __be32 paramsize; |
| u8 parameters[12]; /*assuming RSA*/ |
| __be32 keysize; |
| u8 modulus[256]; |
| u8 checksum[20]; |
| } __packed; |
| |
| typedef union { |
| struct tpm_input_header in; |
| struct tpm_output_header out; |
| } tpm_cmd_header; |
| |
| struct tpm_pcrread_out { |
| u8 pcr_result[TPM_DIGEST_SIZE]; |
| } __packed; |
| |
| struct tpm_pcrread_in { |
| __be32 pcr_idx; |
| } __packed; |
| |
| struct tpm_pcrextend_in { |
| __be32 pcr_idx; |
| u8 hash[TPM_DIGEST_SIZE]; |
| } __packed; |
| |
| /* 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18 |
| * bytes, but 128 is still a relatively large number of random bytes and |
| * anything much bigger causes users of struct tpm_cmd_t to start getting |
| * compiler warnings about stack frame size. */ |
| #define TPM_MAX_RNG_DATA 128 |
| |
| struct tpm_getrandom_out { |
| __be32 rng_data_len; |
| u8 rng_data[TPM_MAX_RNG_DATA]; |
| } __packed; |
| |
| struct tpm_getrandom_in { |
| __be32 num_bytes; |
| } __packed; |
| |
| struct tpm_startup_in { |
| __be16 startup_type; |
| } __packed; |
| |
| typedef union { |
| struct tpm_getcap_params_out getcap_out; |
| struct tpm_readpubek_params_out readpubek_out; |
| u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)]; |
| struct tpm_getcap_params_in getcap_in; |
| struct tpm_pcrread_in pcrread_in; |
| struct tpm_pcrread_out pcrread_out; |
| struct tpm_pcrextend_in pcrextend_in; |
| struct tpm_getrandom_in getrandom_in; |
| struct tpm_getrandom_out getrandom_out; |
| struct tpm_startup_in startup_in; |
| } tpm_cmd_params; |
| |
| struct tpm_cmd_t { |
| tpm_cmd_header header; |
| tpm_cmd_params params; |
| } __packed; |
| |
| /* A string buffer type for constructing TPM commands. This is based on the |
| * ideas of string buffer code in security/keys/trusted.h but is heap based |
| * in order to keep the stack usage minimal. |
| */ |
| |
| enum tpm_buf_flags { |
| TPM_BUF_OVERFLOW = BIT(0), |
| }; |
| |
| struct tpm_buf { |
| struct page *data_page; |
| unsigned int flags; |
| u8 *data; |
| }; |
| |
| static inline int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal) |
| { |
| struct tpm_input_header *head; |
| |
| buf->data_page = alloc_page(GFP_HIGHUSER); |
| if (!buf->data_page) |
| return -ENOMEM; |
| |
| buf->flags = 0; |
| buf->data = kmap(buf->data_page); |
| |
| head = (struct tpm_input_header *) buf->data; |
| |
| head->tag = cpu_to_be16(tag); |
| head->length = cpu_to_be32(sizeof(*head)); |
| head->ordinal = cpu_to_be32(ordinal); |
| |
| return 0; |
| } |
| |
| static inline void tpm_buf_destroy(struct tpm_buf *buf) |
| { |
| kunmap(buf->data_page); |
| __free_page(buf->data_page); |
| } |
| |
| static inline u32 tpm_buf_length(struct tpm_buf *buf) |
| { |
| struct tpm_input_header *head = (struct tpm_input_header *) buf->data; |
| |
| return be32_to_cpu(head->length); |
| } |
| |
| static inline u16 tpm_buf_tag(struct tpm_buf *buf) |
| { |
| struct tpm_input_header *head = (struct tpm_input_header *) buf->data; |
| |
| return be16_to_cpu(head->tag); |
| } |
| |
| static inline void tpm_buf_append(struct tpm_buf *buf, |
| const unsigned char *new_data, |
| unsigned int new_len) |
| { |
| struct tpm_input_header *head = (struct tpm_input_header *) buf->data; |
| u32 len = tpm_buf_length(buf); |
| |
| /* Return silently if overflow has already happened. */ |
| if (buf->flags & TPM_BUF_OVERFLOW) |
| return; |
| |
| if ((len + new_len) > PAGE_SIZE) { |
| WARN(1, "tpm_buf: overflow\n"); |
| buf->flags |= TPM_BUF_OVERFLOW; |
| return; |
| } |
| |
| memcpy(&buf->data[len], new_data, new_len); |
| head->length = cpu_to_be32(len + new_len); |
| } |
| |
| static inline void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value) |
| { |
| tpm_buf_append(buf, &value, 1); |
| } |
| |
| static inline void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value) |
| { |
| __be16 value2 = cpu_to_be16(value); |
| |
| tpm_buf_append(buf, (u8 *) &value2, 2); |
| } |
| |
| static inline void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value) |
| { |
| __be32 value2 = cpu_to_be32(value); |
| |
| tpm_buf_append(buf, (u8 *) &value2, 4); |
| } |
| |
| extern struct class *tpm_class; |
| extern dev_t tpm_devt; |
| extern const struct file_operations tpm_fops; |
| |
| ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *); |
| ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf, |
| size_t bufsiz); |
| ssize_t tpm_transmit_cmd(struct tpm_chip *chip, void *cmd, int len, |
| const char *desc); |
| extern int tpm_get_timeouts(struct tpm_chip *); |
| extern void tpm_gen_interrupt(struct tpm_chip *); |
| extern int tpm_do_selftest(struct tpm_chip *); |
| extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32); |
| extern int tpm_pm_suspend(struct device *); |
| extern int tpm_pm_resume(struct device *); |
| extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long, |
| wait_queue_head_t *, bool); |
| |
| struct tpm_chip *tpm_chip_find_get(int chip_num); |
| extern struct tpm_chip *tpmm_chip_alloc(struct device *dev, |
| const struct tpm_class_ops *ops); |
| extern int tpm_chip_register(struct tpm_chip *chip); |
| extern void tpm_chip_unregister(struct tpm_chip *chip); |
| |
| int tpm_sysfs_add_device(struct tpm_chip *chip); |
| void tpm_sysfs_del_device(struct tpm_chip *chip); |
| |
| int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf); |
| |
| #ifdef CONFIG_ACPI |
| extern void tpm_add_ppi(struct tpm_chip *chip); |
| #else |
| static inline void tpm_add_ppi(struct tpm_chip *chip) |
| { |
| } |
| #endif |
| |
| int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf); |
| int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash); |
| int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max); |
| int tpm2_seal_trusted(struct tpm_chip *chip, |
| struct trusted_key_payload *payload, |
| struct trusted_key_options *options); |
| int tpm2_unseal_trusted(struct tpm_chip *chip, |
| struct trusted_key_payload *payload, |
| struct trusted_key_options *options); |
| ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id, |
| u32 *value, const char *desc); |
| |
| extern int tpm2_startup(struct tpm_chip *chip, u16 startup_type); |
| extern void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type); |
| extern unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *, u32); |
| extern int tpm2_do_selftest(struct tpm_chip *chip); |
| extern int tpm2_gen_interrupt(struct tpm_chip *chip); |
| extern int tpm2_probe(struct tpm_chip *chip); |