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697e6ccb89
As a demo, query the firmware version. `Meta/serenity.sh gdb aarch64` can be used to observe that qemu puts 0x548E1 in x0 in response to this mailbox message.
31 lines
771 B
C++
31 lines
771 B
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/Types.h>
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namespace Prekernel {
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// Knows about memory-mapped IO addresses on the Broadcom family of SOCs used in Raspberry Pis.
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// RPi3 is the first Raspberry Pi that supports aarch64.
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// https://datasheets.raspberrypi.org/bcm2836/bcm2836-peripherals.pdf (RPi3)
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// https://datasheets.raspberrypi.org/bcm2711/bcm2711-peripherals.pdf (RPi4 Model B)
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class MMIO {
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public:
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static MMIO& the();
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u32 read(FlatPtr offset) { return *(u32 volatile*)(m_base_address + offset); }
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void write(FlatPtr offset, u32 value) { *(u32 volatile*)(m_base_address + offset) = value; }
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private:
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MMIO();
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unsigned int m_base_address;
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};
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}
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