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// Code for interacting with bootrom on rp235x chips
//
// Copyright (C) 2024 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include <stdint.h> // uint32_t
#include "boot/picoboot_constants.h" // REBOOT2_FLAG_REBOOT_TYPE_BOOTSEL
#include "hardware/address_mapped.h" // static_assert
#include "internal.h" // bootrom_read_unique_id
#include "pico/bootrom_constants.h" // RT_FLAG_FUNC_ARM_NONSEC
static void *
rom_func_lookup(uint32_t code)
{
typedef void *(*rom_table_lookup_fn)(uint32_t code, uint32_t mask);
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Warray-bounds"
rom_table_lookup_fn rom_table_lookup = (rom_table_lookup_fn)
(uintptr_t)*(uint16_t*)(BOOTROM_TABLE_LOOKUP_OFFSET);
#pragma GCC diagnostic pop
return rom_table_lookup(code, RT_FLAG_FUNC_ARM_SEC);
}
/****************************************************************
* Reboot to USB rom bootloader
****************************************************************/
void
bootrom_reboot_usb_bootloader(void)
{
typedef int (*rom_reboot_fn)(uint32_t flags, uint32_t delay_ms
, uint32_t p0, uint32_t p1);
rom_reboot_fn func = rom_func_lookup(ROM_FUNC_REBOOT);
func(REBOOT2_FLAG_REBOOT_TYPE_BOOTSEL | REBOOT2_FLAG_NO_RETURN_ON_SUCCESS
, 10, 0, 0);
}
/****************************************************************
* Unique id reading
****************************************************************/
#define PICO_UNIQUE_BOARD_ID_SIZE_BYTES 8
void
bootrom_read_unique_id(uint8_t *out, uint32_t maxlen)
{
typedef int (*rom_get_sys_info_fn)(uint8_t *out_buffer
, uint32_t out_buffer_word_size
, uint32_t flags);
rom_get_sys_info_fn func = rom_func_lookup(ROM_FUNC_GET_SYS_INFO);
uint8_t data[9 * 4];
func(data, 9, SYS_INFO_CHIP_INFO);
int i;
for (i = 0; i < PICO_UNIQUE_BOARD_ID_SIZE_BYTES; i++)
out[i] = data[PICO_UNIQUE_BOARD_ID_SIZE_BYTES - 1 + 2 * 4 - i];
}
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