/* * Copyright (c) 2025 Ian Marco Moffett and L5 engineers * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #ifndef _OS_BUS_H_ #define _OS_BUS_H_ #include typedef enum { BUS_PCI_NONE, BUS_PCI_PCI, } bus_type_t; /* * Represents a physical or virtual MMIO address that * allows tranmission and reception on the bus. */ typedef uintptr_t bus_addr_t; /* * Represents a bus space that can be used with certain * bus interfaces * * @va_base: Virtual address base * @length: Length at buffer * @type: Type of the space space (see BUS_*) */ struct bus_space { void *va_base; size_t length; bus_type_t type; }; /* * Initialize a bus space descriptor and map a physical * bus address. * * @bp: Bus space descriptor to use * @pa: Physical bus address to map. * @len: Length of mapping to use * * Returns zero on success, otherwise a less than zero * value. */ int bus_space_map(struct bus_space *bp, bus_addr_t pa, size_t len); #endif /* !_OS_BUS_H_ */