max32xxx_write.c 11.1 KB
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/*******************************************************************************
 * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Except as contained in this notice, the name of Maxim Integrated
 * Products, Inc. shall not be used except as stated in the Maxim Integrated
 * Products, Inc. Branding Policy.
 *
 * The mere transfer of this software does not imply any licenses
 * of trade secrets, proprietary technology, copyrights, patents,
 * trademarks, maskwork rights, or any other form of intellectual
 * property whatsoever. Maxim Integrated Products, Inc. retains all
 * ownership rights.
 *
 *******************************************************************************
 */

/***** Includes *****/
#ifdef ALGO_TEST
#include "mxc_config.h"
#endif

#include "tpu_regs.h"
#include "gcr_regs.h"
#include "flc_regs.h"
#include "algo_options.h"

#ifdef ALGO_TEST
#include <stdio.h>
#else
#define printf(...)
#endif

/***** Definitions *****/
#define MXC_BASE_TPU                    ((uint32_t)0x40001000UL)
#define MXC_TPU                         ((mxc_tpu_regs_t*)MXC_BASE_TPU)
#define MXC_BASE_GCR                    ((uint32_t)0x40000000UL)
#define MXC_GCR                         ((mxc_gcr_regs_t*)MXC_BASE_GCR)

/******************************************************************************/
#define getbyte(temp8)                                                          \
    /* Wait for the Read FIFO to not equal the Write FIFO */                    \
    while (*read_ptr == *write_ptr);                                            \
    temp8 = **read_ptr;                                                         \
                                                                                \
    /* Increment and wrap around the read pointer */                            \
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    if ((*read_ptr + 1) >= (uint8_t*)(work_end - 8 - 256)) {                                          \
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        *read_ptr = (uint8_t *)(work_start + 8);                                       \
    } else {                                                                    \
        (*read_ptr)++;                                                          \
    }                                                                           \
    len--;                                                                      \
    addr++;

/******************************************************************************/
#ifndef ALGO_TEST
__attribute__ ((naked, section(".algo")))
#endif
void algo_write(uint8_t *work_start, uint8_t *work_end, uint32_t len, uint32_t addr)
{

    printf(" > algo_write() starting\n");

    uint8_t * volatile *write_ptr = (uint8_t **)work_start;
    uint8_t * volatile *read_ptr = (uint8_t **)(work_start + 4);
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    uint32_t *flc_base = (uint32_t *)(work_end - 4 - 128);
    uint32_t *options = (uint32_t *)(work_end - 8 - 128);
    uint32_t *enc_buffer = (uint32_t *)(work_end - 8 - 256);
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    uint8_t temp8;
    uint32_t addr_save;
    int i;
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    mxc_flc_regs_t * MXC_FLC=(mxc_flc_regs_t*)*flc_base;
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    printf(" > w%08x r%08x o%08x f%08x b%08x b%08x\n", 
        (uint32_t)write_ptr, (uint32_t)read_ptr, (uint32_t)*options, (uint32_t)*flc_base, (uint32_t)enc_buffer, (uint32_t)(enc_buffer + 256));
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    if(*options & OPTIONS_ENC) {
        /* Enable Memory Protection */
        MXC_GCR->scon |= MXC_F_GCR_SCON_MEMPROT_EN;

        /* Set the keysize */
        if(*options & OPTIONS_KEYSIZE) {
            MXC_GCR->scon |= MXC_F_GCR_SCON_MEMPROT_KEYSZ;
        } else {
            MXC_GCR->scon &= ~(MXC_F_GCR_SCON_MEMPROT_KEYSZ);
        }
    } else {
        /* Disable memory protection */
        MXC_GCR->scon &= ~MXC_F_GCR_SCON_MEMPROT_EN;
    }

    if(*options & OPTIONS_ENC) {
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        // Setup the AES

        /* Enable CRYPTO clock */
        if ((MXC_GCR->clkcn & MXC_F_GCR_CLKCN_HIRC_EN) == 0) {
            MXC_GCR->clkcn |= MXC_F_GCR_CLKCN_HIRC_EN;
        }

        /* Disable CRYPTO clock gate */
        if (MXC_GCR->perckcn0 & MXC_F_GCR_PERCKCN0_CRYPTOD) {
            MXC_GCR->perckcn0 &= ~(MXC_F_GCR_PERCKCN0_CRYPTOD);
        }

        // Reset Crypto block and clear state
        MXC_TPU->ctrl = MXC_F_TPU_CTRL_RST;

        // Set the legacy bit
        MXC_TPU->ctrl |= MXC_F_TPU_CTRL_FLAG_MODE;

        // Byte swap the input and output
        MXC_TPU->ctrl |= MXC_F_TPU_CTRL_BSO;
        MXC_TPU->ctrl |= MXC_F_TPU_CTRL_BSI;
    }

    while(len) {

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        if((*options & OPTIONS_128) == 0) {
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            // Save the current address before we read from the working area
            addr_save = addr;

            // 32-bit write
            MXC_FLC->cn |= MXC_F_FLC_CN_WDTH;

            enc_buffer[0] = 0;
            for(i = 0; i < 4; i++) {
                // Get data from the working area, pad with 0xFF
                if(len) {
                    getbyte(temp8);
                } else {
                    temp8 = 0xFF;
                }  
                enc_buffer[0] |= (temp8 << (i*8));
            }

            // Unlock the flash
            MXC_FLC->cn = (MXC_FLC->cn & ~MXC_F_FLC_CN_UNLOCK) | MXC_S_FLC_CN_UNLOCK_UNLOCKED;

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            // 32-bit write
            MXC_FLC->cn |= MXC_F_FLC_CN_WDTH;

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            MXC_FLC->addr = addr_save;
            MXC_FLC->data[0] = enc_buffer[0];

            // Enable the write
            MXC_FLC->cn |= MXC_F_FLC_CN_WR;

            // Wait for the operation to complete
            while(MXC_FLC->cn & MXC_F_FLC_CN_WR) {}

            /* Lock flash */
            MXC_FLC->cn &= ~MXC_F_FLC_CN_UNLOCK;
            
            /* Check access violations */
            if (MXC_FLC->intr & MXC_F_FLC_INTR_AF) {
                MXC_FLC->intr &= ~MXC_F_FLC_INTR_AF;
                #ifndef ALGO_TEST
                __asm("bkpt\n");
                #else
                printf(" > Error writing to flash\n");
                return;
                #endif
            }
        } else {

            // Save the current address before we read from the working area
            addr_save = addr;

            // Fill the buffer with the plain text data from the working area
            for(i = 0; i < 4; i++) {
                // Get data from the working area, pad with 0xFF
                enc_buffer[i] = 0;
                if(len) {
                    getbyte(temp8);
                } else {
                    temp8 = 0xFF;
                }  
                enc_buffer[i] |= (temp8 << (0));
                // Get data from the working area, pad with 0xFF
                if(len) {
                    getbyte(temp8);
                } else {
                    temp8 = 0xFF;
                }  
                enc_buffer[i] |= (temp8 << (8));
                // Get data from the working area, pad with 0xFF
                if(len) {
                    getbyte(temp8);
                } else {
                    temp8 = 0xFF;
                }  
                enc_buffer[i] |= (temp8 << (16));
                // Get data from the working area, pad with 0xFF
                if(len) {
                    getbyte(temp8);
                } else {
                    temp8 = 0xFF;
                }  
                enc_buffer[i] |= (temp8 << (24));
            }

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            if(*options & OPTIONS_ENC) {
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                // XOR data with the address
                for(i = 0; i < 4; i++) {
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                    if(*options & OPTIONS_RELATIVE_XOR) {
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                        enc_buffer[i] ^= ((addr_save & 0x00FFFFFF) + i*4);
                    } else {
                        enc_buffer[i] ^= (addr_save + i*4);
                    }     
                }

                // Encrypt the plain text
                // Clear interrupt flags
                MXC_TPU->ctrl |= MXC_F_TPU_CTRL_CPH_DONE;

                MXC_TPU->cipher_ctrl = ((0x0 << MXC_F_TPU_CIPHER_CTRL_MODE_POS) |
                    (0x0 << MXC_F_TPU_CIPHER_CTRL_ENC_POS));

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                if(*options & OPTIONS_KEYSIZE) {
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                    // ECB, AES-256, encrypt
                    MXC_TPU->cipher_ctrl |= (0x3 << MXC_F_TPU_CIPHER_CTRL_CIPHER_POS);
                } else {
                    // ECB, AES-128, encrypt
                    MXC_TPU->cipher_ctrl |= (0x1 << MXC_F_TPU_CIPHER_CTRL_CIPHER_POS);
                }

                // Set the key source
                MXC_TPU->cipher_ctrl = ((MXC_TPU->cipher_ctrl & ~MXC_F_TPU_CIPHER_CTRL_SRC) |
                    (0x3 << MXC_F_TPU_CIPHER_CTRL_SRC_POS));
                
                // Copy data to start the operation
                MXC_TPU->din[0] = enc_buffer[0];
                MXC_TPU->din[1] = enc_buffer[1];
                MXC_TPU->din[2] = enc_buffer[2];
                MXC_TPU->din[3] = enc_buffer[3];

                // Wait until operation is complete
                while(!(MXC_TPU->ctrl & MXC_F_TPU_CTRL_CPH_DONE)) {}

                // Copy the data out
                enc_buffer[0] = MXC_TPU->dout[0];
                enc_buffer[1] = MXC_TPU->dout[1];
                enc_buffer[2] = MXC_TPU->dout[2];
                enc_buffer[3] = MXC_TPU->dout[3];
            }

            // Unlock the flash
            MXC_FLC->cn = (MXC_FLC->cn & ~MXC_F_FLC_CN_UNLOCK) | MXC_S_FLC_CN_UNLOCK_UNLOCKED;

            // 128-bit write
            MXC_FLC->cn &= ~MXC_F_FLC_CN_WDTH;

            MXC_FLC->addr = addr_save;
            MXC_FLC->data[0] = enc_buffer[0];
            MXC_FLC->data[1] = enc_buffer[1];
            MXC_FLC->data[2] = enc_buffer[2];
            MXC_FLC->data[3] = enc_buffer[3];

            // Enable the write
            MXC_FLC->cn |= MXC_F_FLC_CN_WR;

            // Wait for the operation to complete
            while(MXC_FLC->cn & MXC_F_FLC_CN_WR) {}

            /* Lock flash */
            MXC_FLC->cn &= ~MXC_F_FLC_CN_UNLOCK;
            
            /* Check access violations */
            if (MXC_FLC->intr & MXC_F_FLC_INTR_AF) {
                MXC_FLC->intr &= ~MXC_F_FLC_INTR_AF;
                #ifndef ALGO_TEST
                __asm("bkpt\n");
                #else
                printf(" > Error writing to flash\n");
                return;
                #endif
            }
        }
    }
       
    #ifndef ALGO_TEST
    __asm("bkpt\n");
    #else
    printf(" > algo_write returning\n");
    return;
    #endif
}