src/main/drivers/memprot_stm32g4xx.c

   1 /*
   2  * This file is part of Cleanflight and Betaflight.
   3  *
   4  * Cleanflight and Betaflight are free software. You can redistribute
   5  * this software and/or modify this software under the terms of the
   6  * GNU General Public License as published by the Free Software
   7  * Foundation, either version 3 of the License, or (at your option)
   8  * any later version.
   9  *
  10  * Cleanflight and Betaflight are distributed in the hope that they
  11  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  12  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  13  * See the GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this software.
  17  *
  18  * If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "platform.h"
  22
  23 #include "memprot.h"
  24
  25 // Defined in linker script
  26 extern uint8_t dma_ram_r_start;
  27 extern uint8_t dma_ram_r_end;
  28
  29 extern uint8_t dma_ram_w_start;
  30 extern uint8_t dma_ram_w_end;
  31
  32 extern uint8_t dma_ram_rw_start;
  33 extern uint8_t dma_ram_rw_end;
  34
  35 mpuRegion_t mpuRegions[] = {
  36     {
  37         // DMA_RAM_R
  38         // DMA receive buffer in SRAM
  39         .start      = (uint32_t)&dma_ram_r_start,
  40         .end        = (uint32_t)&dma_ram_r_end,
  41         .size       = 0,  // Size determined by ".end"
  42         .perm       = MPU_REGION_FULL_ACCESS,
  43         .exec       = MPU_INSTRUCTION_ACCESS_ENABLE,
  44         .shareable  = MPU_ACCESS_SHAREABLE,
  45         .cacheable  = MPU_ACCESS_NOT_CACHEABLE,
  46         .bufferable = MPU_ACCESS_BUFFERABLE,
  47     },
  48     {
  49         // DMA_RAM_W
  50         // DMA transmit buffer in SRAM
  51         .start      = (uint32_t)&dma_ram_w_start,
  52         .end        = (uint32_t)&dma_ram_w_end,
  53         .size       = 0,  // Size determined by ".end"
  54         .perm       = MPU_REGION_FULL_ACCESS,
  55         .exec       = MPU_INSTRUCTION_ACCESS_ENABLE,
  56         .shareable  = MPU_ACCESS_SHAREABLE,
  57         .cacheable  = MPU_ACCESS_CACHEABLE,
  58         .bufferable = MPU_ACCESS_NOT_BUFFERABLE,
  59     },
  60     {
  61         // DMA_RAM_RW
  62         // DMA transmit and receive buffer in SRAM
  63         .start      = (uint32_t)&dma_ram_rw_start,
  64         .end        = (uint32_t)&dma_ram_rw_end,
  65         .size       = 0,  // Size determined by ".end"
  66         .perm       = MPU_REGION_FULL_ACCESS,
  67         .exec       = MPU_INSTRUCTION_ACCESS_ENABLE,
  68         .shareable  = MPU_ACCESS_SHAREABLE,
  69         .cacheable  = MPU_ACCESS_NOT_CACHEABLE,
  70         .bufferable = MPU_ACCESS_NOT_BUFFERABLE,
  71     },
  72 };
  73
  74 unsigned mpuRegionCount = ARRAYLEN(mpuRegions);