mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-21 22:08:08 +00:00
c09590b54d
Use `FLASH_PTR` macro to convert a flash address to a const pointer. For real hardware it is just a cast, for emulator we subtract the `FLASH_ORIGIN` and use it as index into the memory mapped flash file. Make write access to flash with volatile pointers Also use FLASH_PTR in DebugMemory* for now. This allows for reading and writing the flash in the emulator or just crash it by reading outside the flash...
76 lines
3.1 KiB
C
76 lines
3.1 KiB
C
/*
|
|
* This file is part of the TREZOR project, https://trezor.io/
|
|
*
|
|
* Copyright (C) 2014 Pavol Rusnak <stick@satoshilabs.com>
|
|
*
|
|
* This library is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Lesser General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with this library. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <libopencm3/stm32/flash.h>
|
|
#include <stdint.h>
|
|
#include "memory.h"
|
|
#include "sha2.h"
|
|
|
|
#define FLASH_OPTION_BYTES_1 (*(const uint64_t *)0x1FFFC000)
|
|
#define FLASH_OPTION_BYTES_2 (*(const uint64_t *)0x1FFFC008)
|
|
|
|
void memory_protect(void)
|
|
{
|
|
#if MEMORY_PROTECT
|
|
// Reference STM32F205 Flash programming manual revision 5 http://www.st.com/resource/en/programming_manual/cd00233952.pdf
|
|
// Section 2.6 Option bytes
|
|
// set RDP level 2 WRP for sectors 0 and 1 flash option control register matches
|
|
if (((FLASH_OPTION_BYTES_1 & 0xFFEC) == 0xCCEC) && ((FLASH_OPTION_BYTES_2 & 0xFFF) == 0xFFC) && (FLASH_OPTCR == 0x0FFCCCED)) {
|
|
return; // already set up correctly - bail out
|
|
}
|
|
flash_unlock_option_bytes();
|
|
// Section 2.8.6 Flash option control register (FLASH_OPTCR)
|
|
// Bits 31:28 Reserved, must be kept cleared.
|
|
// Bits 27:16 nWRP: Not write protect: write protect bootloader code in flash main memory sectors 0 and 1 (Section 2.3; table 2)
|
|
// Bits 15:8 RDP: Read protect: level 2 chip read protection active
|
|
// Bits 7:5 USER: User option bytes: no reset on standby, no reset on stop, software watchdog
|
|
// Bit 4 Reserved, must be kept cleared.
|
|
// Bits 3:2 BOR_LEV: BOR reset Level: BOR off
|
|
// Bit 1 OPTSTRT: Option start: ignored by flash_program_option_bytes
|
|
// Bit 0 OPTLOCK: Option lock: ignored by flash_program_option_bytes
|
|
flash_program_option_bytes(0x0FFCCCEC);
|
|
flash_lock_option_bytes();
|
|
#endif
|
|
}
|
|
|
|
// Remove write-protection on all flash sectors.
|
|
//
|
|
// This is an undocumented feature/bug of STM32F205/F405 microcontrollers,
|
|
// where flash controller reads its write protection bits from FLASH_OPTCR
|
|
// register not from OPTION_BYTES, rendering write protection useless.
|
|
// This behaviour is fixed in future designs of flash controller used for
|
|
// example in STM32F427, where the protection bits are read correctly
|
|
// from OPTION_BYTES and not form FLASH_OPCTR register.
|
|
//
|
|
// Read protection is unaffected and always stays locked to the desired value.
|
|
void memory_write_unlock(void)
|
|
{
|
|
flash_unlock_option_bytes();
|
|
flash_program_option_bytes(0x0FFFCCEC);
|
|
flash_lock_option_bytes();
|
|
}
|
|
|
|
int memory_bootloader_hash(uint8_t *hash)
|
|
|
|
{
|
|
sha256_Raw(FLASH_PTR(FLASH_BOOT_START), FLASH_BOOT_LEN, hash);
|
|
sha256_Raw(hash, 32, hash);
|
|
return 32;
|
|
}
|