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// Hardware interface to bootrom on rp2040
//
// Copyright (C) 2021 Lasse Dalegaard <dalegaard@gmail.com>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include <stdint.h> // uint16_t, uint32_t, uintptr_t
#include <string.h> // memcpy
#include "compiler.h" // noinline, __section
#include "internal.h" // _ramfunc
#define ROM_TABLE_CODE(c1, c2) ((c1) | ((c2) << 8))
// All functions in here need to be RAM-resident, as we may need
// to (especially for the flash functions) call while the XIP layer
// is unavailable.
static void * _ramfunc
rom_func_lookup(uint32_t code)
{
// Table and lookup function are provided by the BOOTROM
void *(*fn)(uint16_t *, uint32_t) =
(void *)(uintptr_t)(*(uint16_t *)0x18);
uint16_t *table = (uint16_t *)(uintptr_t)(*(uint16_t *)0x14);
return fn(table, code);
}
void _ramfunc
reset_to_usb_boot(uint32_t gpio_activity_pin_mask
, uint32_t disable_interface_mask)
{
void (*fn)(uint32_t, uint32_t) = rom_func_lookup(ROM_TABLE_CODE('U', 'B'));
fn(gpio_activity_pin_mask, disable_interface_mask);
}
void _ramfunc
connect_internal_flash(void)
{
void (*fn)(void) = rom_func_lookup(ROM_TABLE_CODE('I', 'F'));
fn();
}
void _ramfunc
flash_exit_xip(void)
{
void (*fn)(void) = rom_func_lookup(ROM_TABLE_CODE('E', 'X'));
fn();
}
void _ramfunc
flash_flush_cache(void)
{
void (*fn)(void) = rom_func_lookup(ROM_TABLE_CODE('F', 'C'));
fn();
}
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