mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-15 02:48:11 +00:00
97 lines
3.0 KiB
C
97 lines
3.0 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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#ifndef __SUPERVISE_H__
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#define __SUPERVISE_H__
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#include <stdint.h>
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#if !EMULATOR
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#define SVC_FLASH_UNLOCK 0
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#define SVC_FLASH_ERASE 1
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#define SVC_FLASH_PROGRAM 2
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#define SVC_FLASH_LOCK 3
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#define SVC_TIMER_MS 4
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#define SVC_REBOOT_TO_BOOTLOADER 5
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#define STAY_IN_BOOTLOADER_FLAG_ADDR ((uint32_t *)0x20010000)
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#define STAY_IN_BOOTLOADER_FLAG 0x0FC35A96
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/* Unlocks flash. This function needs to be called before programming
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* or erasing. Multiple calls of flash_program and flash_erase can
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* follow and should be completed with flash_lock().
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*/
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inline void svc_flash_unlock(void) {
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__asm__ __volatile__("svc %0" ::"i"(SVC_FLASH_UNLOCK) : "memory");
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}
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/* Enable flash write operations.
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* @param program_size (8-bit, 16-bit, 32-bit or 64-bit)
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* should be one of the FLASH_CR_PROGRAM_X.. constants
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*/
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inline void svc_flash_program(uint32_t program_size) {
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register uint32_t r0 __asm__("r0") = program_size;
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__asm__ __volatile__("svc %0" ::"i"(SVC_FLASH_PROGRAM), "r"(r0) : "memory");
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}
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/* Erase a flash sector.
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* @param sector sector number 0..11
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* (this only allows erasing meta sectors 2 and 3 though).
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*/
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inline void svc_flash_erase_sector(uint8_t sector) {
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register uint32_t r0 __asm__("r0") = sector;
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__asm__ __volatile__("svc %0" ::"i"(SVC_FLASH_ERASE), "r"(r0) : "memory");
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}
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/* Lock flash after programming or erasing.
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* @return flash status register (FLASH_SR)
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*/
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inline uint32_t svc_flash_lock(void) {
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register uint32_t r0 __asm__("r0");
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__asm__ __volatile__("svc %1" : "=r"(r0) : "i"(SVC_FLASH_LOCK) : "memory");
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return r0;
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}
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inline uint32_t svc_timer_ms(void) {
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register uint32_t r0 __asm__("r0");
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__asm__ __volatile__("svc %1" : "=r"(r0) : "i"(SVC_TIMER_MS) : "memory");
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return r0;
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}
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/* Reboot to bootloader.
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* Sets a flag in memory and reboots. When bootloader runs, it will recognize
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* flag and won't run firmware, but enter bootloader mode.
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*/
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inline void svc_reboot_to_bootloader(void) {
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__asm__ __volatile__("svc %0" ::"i"(SVC_REBOOT_TO_BOOTLOADER) : "memory");
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}
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#else
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extern void svc_flash_unlock(void);
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extern void svc_flash_program(uint32_t program_size);
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extern void svc_flash_erase_sector(uint8_t sector);
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extern uint32_t svc_flash_lock(void);
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extern uint32_t svc_timer_ms(void);
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#endif
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#endif
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