67 lines
3.1 KiB
C
67 lines
3.1 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause */
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/* See the end of this file for copyright, licensing, and warranty information. */
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#pragma once
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/**
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* Block the CPU by continuously checking the same expression in an
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* infinite loop, until the condition is true. Useful for polling.
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*
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* @param expr The expression.
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*/
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#define mom_are_we_there_yet(expr) ({ while (!(expr)); })
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/**
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* Initialize the system hardware.
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* This function is responsible for putting the entire system to a state that
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* allows the Kernel to perform its bootstrap procedure and is therefore the
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* first thing to be called by `do_bootstrap`. Possible tasks to be dealt with
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* here include:
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*
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* - Performing sanity checks to see if there are any major hardware faults
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* - Setting up the CPU frequency and other oscillators
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* - Communicating that frequency change to any hardware component that needs
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* to know about it (especially the flash controller)
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* - Enabling interrupts that are vital for stable operation
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*
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* If any of this fails, a nonzero value must be returned to indicate the error
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* condition. An on-chip LED should be used to "morse" some kind of diagnostic
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* message, if the system has one (kind of like BIOS beep codes).
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*
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* @returns `0` on success, a negative POSIX error code if applicable, or a
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* positive (platform-dependant) number on hardware fault.
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*/
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int sys_init(void);
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#if defined(ARCH_ATMEGA328P)
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#error "ATmega328p is not implemented (yet?)"
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#elif defined(ARCH_AT91SAM3X8E)
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#include <arch/at91sam3x8e/hardware.h>
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#else
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#error "Unsupported architecture"
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#endif
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/*
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* Copyright (c) 2020 Felix Kopp <sandtler@sandtler.club>
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*
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* Redistribution and use in source and binary forms, with or without modification, are permitted
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* provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its contributors may be
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* used to endorse or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
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* WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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