Adds SHA256 Cryptocell code to bootloader

bootloader/Cargo.toml

@@ -15,6 +15,7 @@ cortex-m-rt = "*"
 cortex-m-rt-macros = "*"
 panic-abort = "0.3.2"
 rtt-target = { version = "*", features = ["cortex-m"] }
+tock-registers = { version = "0.6.0", features = ["no_std_unit_tests"] }
 
 [profile.dev]
 panic = "abort"

bootloader/src/bitfields.rs

@@ -0,0 +1,118 @@
+// Copyright 2020-2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use tock_registers::register_bitfields;
+
+register_bitfields! [u32,
+    // Generic or shared bitfields
+    pub Task [
+        ENABLE OFFSET(0) NUMBITS(1)
+    ],
+
+    pub Byte [
+        VALUE OFFSET(0) NUMBITS(8)
+    ],
+
+    pub Busy [
+        /// Asserted when AES_BUSY or DES_BUSY or HASH_BUSY are asserted or when the DIN FIFO is not empty
+        BUSY OFFSET(0) NUMBITS(1) [
+            Ready = 0,
+            Busy = 1
+        ]
+    ],
+
+    // CC_CTL register bitfields
+    pub CryptoMode [
+        /// Determines the active cryptographic engine
+        MODE OFFSET(0) NUMBITS(5) [
+            Bypass = 0,
+            Aes = 1,
+            AesToHash = 2,
+            AesAndHash = 3,
+            Des = 4,
+            DesToHash = 5,
+            DesAndHash = 6,
+            Hash = 7,
+            AesMacAndBypass = 9,
+            AesToHashAndDout = 10
+        ]
+    ],
+
+    // HOST_RGF register bitfields
+    pub Interrupts [
+        /// This interrupt is asserted when all data was delivered to DIN buffer from SRAM
+        SRAM_TO_DIN OFFSET(4) NUMBITS(1),
+        /// This interrupt is asserted when all data was delivered to SRAM buffer from DOUT
+        DOUT_TO_SRAM OFFSET(5) NUMBITS(1),
+        /// This interrupt is asserted when all data was delivered to DIN buffer from memory
+        MEM_TO_DIN OFFSET(6) NUMBITS(1),
+        /// This interrupt is asserted when all data was delivered to memory buffer from DOUT
+        DOUT_TO_MEM OFFSET(7) NUMBITS(1),
+        AXI_ERROR OFFSET(8) NUMBITS(1),
+        /// The PKA end of operation interrupt status
+        PKA_EXP OFFSET(9) NUMBITS(1),
+        /// The RNG interrupt status
+        RNG OFFSET(10) NUMBITS(1),
+        /// The GPR interrupt status
+        SYM_DMA_COMPLETED OFFSET(11) NUMBITS(1)
+    ],
+
+    pub RgfEndianness [
+        /// DOUT write endianness
+        DOUT_WR_BG OFFSET(3) NUMBITS(1) [
+            LittleEndian = 0,
+            BigEndian = 1
+        ],
+        /// DIN write endianness
+        DIN_RD_BG OFFSET(7) NUMBITS(1) [
+            LittleEndian = 0,
+            BigEndian = 1
+        ],
+        /// DOUT write word endianness
+        DOUT_WR_WBG OFFSET(11) NUMBITS(1) [
+            LittleEndian = 0,
+            BigEndian = 1
+        ],
+        /// DIN write word endianness
+        DIN_RD_WBG OFFSET(15) NUMBITS(1) [
+            LittleEndian = 0,
+            BigEndian = 1
+        ]
+    ],
+
+    // DIN and DOUT register bitfields
+    pub LliWord1 [
+        /// Total number of bytes to read using DMA in this entry
+        BYTES_NUM OFFSET(0) NUMBITS(30),
+        /// Indicates the first LLI entry
+        FIRST OFFSET(30) NUMBITS(1),
+        /// Indicates the last LLI entry
+        LAST OFFSET(31) NUMBITS(1)
+    ],
+
+    pub HashControl [
+        // bit 2 is reserved but to simplify the logic we include it in the bitfield.
+        MODE OFFSET(0) NUMBITS(4) [
+            MD5 = 0,
+            SHA1 = 1,
+            SHA256 = 2,
+            SHA224 = 10
+        ]
+    ],
+
+    pub PaddingConfig [
+        /// Enable Padding generation. must be reset upon completion of padding.
+        DO_PAD OFFSET(2) NUMBITS(1)
+    ]
+];