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https://github.com/trezor/trezor-firmware.git
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25e824aaa3
Add Supervise interrupts to allow to do privileged operations like flashing from application code.
89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/*
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* This file is part of the TREZOR project, https://trezor.io/
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*
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* Copyright (C) 2018 Jochen Hoenicke <hoenicke@gmail.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopencm3/stm32/flash.h>
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#include <stdint.h>
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#include "supervise.h"
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#include "memory.h"
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static void svhandler_flash_unlock(void) {
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flash_clear_status_flags();
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flash_unlock();
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}
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static void svhandler_flash_program(uint32_t psize) {
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/* Wait for any write operation to complete. */
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flash_wait_for_last_operation();
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/* check program size argument */
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if (psize != FLASH_CR_PROGRAM_X8
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&& psize != FLASH_CR_PROGRAM_X16
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&& psize != FLASH_CR_PROGRAM_X32
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&& psize != FLASH_CR_PROGRAM_X64)
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return;
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FLASH_CR = (FLASH_CR & ~(FLASH_CR_PROGRAM_MASK << FLASH_CR_PROGRAM_SHIFT))
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| (psize << FLASH_CR_PROGRAM_SHIFT);
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FLASH_CR |= FLASH_CR_PG;
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}
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static void svhandler_flash_erase_sector(uint16_t sector) {
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/* we only allow erasing meta sectors 2 and 3. */
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if (sector < FLASH_META_SECTOR_FIRST ||
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sector > FLASH_META_SECTOR_LAST) {
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return;
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}
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flash_erase_sector(sector, FLASH_CR_PROGRAM_X32);
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}
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static uint32_t svhandler_flash_lock(void) {
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/* Wait for any write operation to complete. */
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flash_wait_for_last_operation();
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/* Disable writes to flash. */
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FLASH_CR &= ~FLASH_CR_PG;
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/* lock flash register */
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FLASH_CR |= FLASH_CR_LOCK;
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/* return flash status register */
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return FLASH_SR;
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}
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extern volatile uint32_t system_millis;
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void svc_handler_main(uint32_t *stack) {
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uint8_t svc_number = ((uint8_t*) stack[6])[-2];
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switch (svc_number) {
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case SVC_FLASH_UNLOCK:
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svhandler_flash_unlock();
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break;
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case SVC_FLASH_PROGRAM:
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svhandler_flash_program(stack[0]);
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break;
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case SVC_FLASH_ERASE:
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svhandler_flash_erase_sector(stack[0]);
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break;
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case SVC_FLASH_LOCK:
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stack[0] = svhandler_flash_lock();
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break;
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case SVC_TIMER_MS:
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stack[0] = system_millis;
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break;
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default:
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stack[0] = 0xffffffff;
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break;
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}
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}
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