mirror of
https://github.com/RGBCube/serenity
synced 2025-07-28 10:17:34 +00:00
c460b84ebe
While the PL011-based UART0 is currently reserved for the kernel console, UART1 is free to be exposed to the userspace as `/dev/ttyS0`. This will be used as the stdout of `run-tests-and-shutdown.sh` when testing the AArch64 kernel.
47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
/*
|
|
* Copyright (c) 2023, Daniel Bertalan <dani@danielbertalan.dev>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <Kernel/Devices/CharacterDevice.h>
|
|
#include <Kernel/Devices/DeviceManagement.h>
|
|
#include <Kernel/Locking/Spinlock.h>
|
|
|
|
namespace Kernel::RPi {
|
|
|
|
struct MiniUARTRegisters;
|
|
|
|
// Makes the secondary "mini UART" (UART1) available to the userspace.
|
|
// See bcm2711-peripherals.pdf chapter "2.2. Mini UART".
|
|
class MiniUART final : public CharacterDevice {
|
|
friend class Kernel::DeviceManagement;
|
|
|
|
public:
|
|
static ErrorOr<NonnullLockRefPtr<MiniUART>> create();
|
|
|
|
virtual ~MiniUART() override;
|
|
|
|
// ^CharacterDevice
|
|
virtual bool can_read(OpenFileDescription const&, u64) const override;
|
|
virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
|
|
virtual bool can_write(OpenFileDescription const&, u64) const override;
|
|
virtual ErrorOr<size_t> write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t) override;
|
|
|
|
void put_char(u8);
|
|
|
|
private:
|
|
MiniUART();
|
|
|
|
// ^CharacterDevice
|
|
virtual StringView class_name() const override { return "MiniUART"sv; }
|
|
|
|
void set_baud_rate(u32);
|
|
|
|
bool m_last_put_char_was_carriage_return { false };
|
|
Spinlock<LockRank::None> m_serial_lock {};
|
|
MiniUARTRegisters volatile* m_registers;
|
|
};
|
|
}
|