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https://github.com/fergalmoran/ladybird.git
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fdc86ddae5
This allows configuring the alternate pin functions and pin pull up/down states, which is needed for using the UART.
47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
/*
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* Copyright (c) 2021, Nico Weber <thakis@chromium.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Types.h>
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#include <Kernel/Prekernel/Arch/aarch64/GPIO.h>
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#include <Kernel/Prekernel/Arch/aarch64/Mailbox.h>
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extern "C" [[noreturn]] void halt();
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extern "C" [[noreturn]] void init();
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extern "C" [[noreturn]] void init()
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{
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auto& gpio = Prekernel::GPIO::the();
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gpio.set_pin_function(14, Prekernel::GPIO::PinFunction::Alternate0);
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gpio.set_pin_function(15, Prekernel::GPIO::PinFunction::Alternate0);
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gpio.set_pin_pull_up_down_state(Array { 14, 15 }, Prekernel::GPIO::PullUpDownState::Disable);
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[[maybe_unused]] u32 firmware_version = Prekernel::Mailbox::query_firmware_version();
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halt();
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}
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// FIXME: Share this with the Intel Prekernel.
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extern size_t __stack_chk_guard;
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size_t __stack_chk_guard;
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extern "C" [[noreturn]] void __stack_chk_fail();
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[[noreturn]] void halt()
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{
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for (;;) {
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asm volatile("wfi");
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}
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}
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void __stack_chk_fail()
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{
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halt();
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}
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[[noreturn]] void __assertion_failed(char const*, char const*, unsigned int, char const*)
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{
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halt();
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}
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