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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 | // SPDX-License-Identifier: GPL-2.0+ /* * Copyright (c) 2013 The Chromium OS Authors. * Coypright (c) 2013 Guntermann & Drunck GmbH */ #define LOG_CATEGORY UCLASS_TPM #include <dm.h> #include <log.h> #include <asm/unaligned.h> #include <tpm-common.h> #include "tpm-utils.h" enum tpm_version tpm_get_version(struct udevice *dev) { struct tpm_chip_priv *priv = dev_get_uclass_priv(dev); return priv->version; } int pack_byte_string(u8 *str, size_t size, const char *format, ...) { va_list args; size_t offset = 0, length = 0; u8 *data = NULL; u32 value = 0; va_start(args, format); for (; *format; format++) { switch (*format) { case 'b': offset = va_arg(args, size_t); value = va_arg(args, int); length = 1; break; case 'w': offset = va_arg(args, size_t); value = va_arg(args, int); length = 2; break; case 'd': offset = va_arg(args, size_t); value = va_arg(args, u32); length = 4; break; case 's': offset = va_arg(args, size_t); data = va_arg(args, u8 *); length = va_arg(args, u32); break; default: debug("Couldn't recognize format string\n"); va_end(args); return -1; } if (offset + length > size) { va_end(args); return -1; } switch (*format) { case 'b': str[offset] = value; break; case 'w': put_unaligned_be16(value, str + offset); break; case 'd': put_unaligned_be32(value, str + offset); break; case 's': memcpy(str + offset, data, length); break; } } va_end(args); return 0; } int unpack_byte_string(const u8 *str, size_t size, const char *format, ...) { va_list args; size_t offset = 0, length = 0; u8 *ptr8 = NULL; u16 *ptr16 = NULL; u32 *ptr32 = NULL; va_start(args, format); for (; *format; format++) { switch (*format) { case 'b': offset = va_arg(args, size_t); ptr8 = va_arg(args, u8 *); length = 1; break; case 'w': offset = va_arg(args, size_t); ptr16 = va_arg(args, u16 *); length = 2; break; case 'd': offset = va_arg(args, size_t); ptr32 = va_arg(args, u32 *); length = 4; break; case 's': offset = va_arg(args, size_t); ptr8 = va_arg(args, u8 *); length = va_arg(args, u32); break; default: va_end(args); debug("Couldn't recognize format string\n"); return -1; } if (offset + length > size) { va_end(args); log_err("Failed to read: size=%zd, offset=%zx, len=%zx\n", size, offset, length); return -1; } switch (*format) { case 'b': *ptr8 = str[offset]; break; case 'w': *ptr16 = get_unaligned_be16(str + offset); break; case 'd': *ptr32 = get_unaligned_be32(str + offset); break; case 's': memcpy(ptr8, str + offset, length); break; } } va_end(args); return 0; } u32 tpm_command_size(const void *command) { const size_t command_size_offset = 2; return get_unaligned_be32(command + command_size_offset); } u32 tpm_return_code(const void *response) { const size_t return_code_offset = 6; return get_unaligned_be32(response + return_code_offset); } u32 tpm_sendrecv_command(struct udevice *dev, const void *command, void *response, size_t *size_ptr) { int err, ret; u8 response_buffer[COMMAND_BUFFER_SIZE]; size_t response_length; int i; uint size; if (response) { response_length = *size_ptr; } else { response = response_buffer; response_length = sizeof(response_buffer); } size = tpm_command_size(command); /* sanity check, which also helps coverity */ if (size > COMMAND_BUFFER_SIZE) return log_msg_ret("size", -E2BIG); log_debug("TPM request [size:%d]: ", size); for (i = 0; i < size; i++) log_debug("%02x ", ((u8 *)command)[i]); log_debug("\n"); err = tpm_xfer(dev, command, size, response, &response_length); if (err < 0) return err; if (size_ptr) *size_ptr = response_length; ret = tpm_return_code(response); log_debug("TPM response [ret:%d]: ", ret); for (i = 0; i < response_length; i++) log_debug("%02x ", ((u8 *)response)[i]); log_debug("\n"); return ret; } int tpm_init(struct udevice *dev) { return tpm_open(dev); } |