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https://github.com/RGBCube/serenity
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6d2c298b66
As there is no need for a Prekernel on aarch64, the Prekernel code was moved into Kernel itself. The functionality remains the same. SERENITY_KERNEL_AND_INITRD in run.sh specifies a kernel and an inital ramdisk to be used by the emulator. This is needed because aarch64 does not need a Prekernel and the other ones do.
60 lines
1.2 KiB
C++
60 lines
1.2 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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#pragma once
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#include <AK/Array.h>
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#include <AK/Types.h>
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namespace Prekernel {
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struct GPIOControlRegisters;
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// Can configure the general-purpose I/O registers on a Raspberry Pi.
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class GPIO {
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public:
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enum class PinFunction {
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Input = 0,
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Output = 1,
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Alternate0 = 0b100,
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Alternate1 = 0b101,
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Alternate2 = 0b110,
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Alternate3 = 0b111,
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Alternate4 = 0b011,
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Alternate5 = 0b010,
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};
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static GPIO& the();
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void set_pin_function(unsigned pin_number, PinFunction);
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enum class PullUpDownState {
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Disable = 0,
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PullDown = 1,
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PullUp = 2,
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};
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template<size_t N>
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void set_pin_pull_up_down_state(Array<int, N> pins, PullUpDownState state)
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{
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u32 enable[2] = {};
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for (int pin : pins) {
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if (pin < 32)
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enable[0] |= (1 << pin);
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else
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enable[1] |= (1 << (pin - 32));
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}
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internal_enable_pins(enable, state);
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}
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private:
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GPIO();
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void internal_enable_pins(u32 enable[2], PullUpDownState state);
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GPIOControlRegisters volatile* m_registers;
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};
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}
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