58 lines
2.3 KiB
C
58 lines
2.3 KiB
C
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/* Copyright 2021 QMK
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU 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 program 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "bootloader.h"
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#include <avr/wdt.h>
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#define FLASH_SIZE (FLASHEND + 1L)
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#if !defined(MCUCSR)
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# if defined(MCUSR)
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# define MCUCSR MCUSR
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# endif
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#endif
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__attribute__((weak))
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void bootloader_jump(void) {
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// Taken with permission of Stephan Baerwolf from https://github.com/tinyusbboard/API/blob/master/apipage.c
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wdt_enable(WDTO_15MS);
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wdt_reset();
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asm volatile("cli \n\t"
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"ldi r29 , %[ramendhi] \n\t"
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"ldi r28 , %[ramendlo] \n\t"
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#if (FLASHEND > 131071)
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"ldi r18 , %[bootaddrhi] \n\t"
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"st Y+, r18 \n\t"
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#endif
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"ldi r18 , %[bootaddrme] \n\t"
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"st Y+, r18 \n\t"
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"ldi r18 , %[bootaddrlo] \n\t"
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"st Y+, r18 \n\t"
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"out %[mcucsrio], __zero_reg__ \n\t"
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"bootloader_startup_loop%=: \n\t"
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"rjmp bootloader_startup_loop%= \n\t"
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:
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: [mcucsrio] "I"(_SFR_IO_ADDR(MCUCSR)),
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#if (FLASHEND > 131071)
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[ramendhi] "M"(((RAMEND - 2) >> 8) & 0xff), [ramendlo] "M"(((RAMEND - 2) >> 0) & 0xff), [bootaddrhi] "M"((((FLASH_SIZE - BOOTLOADER_SIZE) >> 1) >> 16) & 0xff),
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#else
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[ramendhi] "M"(((RAMEND - 1) >> 8) & 0xff), [ramendlo] "M"(((RAMEND - 1) >> 0) & 0xff),
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#endif
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[bootaddrme] "M"((((FLASH_SIZE - BOOTLOADER_SIZE) >> 1) >> 8) & 0xff), [bootaddrlo] "M"((((FLASH_SIZE - BOOTLOADER_SIZE) >> 1) >> 0) & 0xff));
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}
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