From ea4f3cfceb3e3f926a517ab0bb2373c8f4152671 Mon Sep 17 00:00:00 2001 From: Ian Moffett Date: Sun, 2 Jun 2024 23:04:53 -0400 Subject: kernel/amd64: bus: Add bus abstraction layer Signed-off-by: Ian Moffett --- sys/arch/amd64/amd64/bus_machdep.c | 83 ++++++++++++++++++++++++++++++++++++++ sys/include/arch/amd64/bus.h | 39 ++++++++++++++++++ 2 files changed, 122 insertions(+) create mode 100644 sys/arch/amd64/amd64/bus_machdep.c create mode 100644 sys/include/arch/amd64/bus.h diff --git a/sys/arch/amd64/amd64/bus_machdep.c b/sys/arch/amd64/amd64/bus_machdep.c new file mode 100644 index 0000000..91e7963 --- /dev/null +++ b/sys/arch/amd64/amd64/bus_machdep.c @@ -0,0 +1,83 @@ +/* + * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team. + * 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 Hyra 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. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * Map a physical device address into the kernel address + * space. + * + * @addr: Physical address to map. + * @size: Size to map. + * @flags: Mapping flags. + * @vap: Resulting virtual address. + */ +int +bus_map(bus_addr_t addr, size_t size, int flags, void **vap) +{ + struct vm_ctx *vmctx = vm_get_ctx(); + struct vas vas; + size_t pagesize; + vaddr_t va; + int status; + + pagesize = vm_get_page_size(); + size = __ALIGN_UP(size, pagesize); + + va = (vaddr_t)PHYS_TO_VIRT(addr); + vas = pmap_read_vas(); + + /* Ensure the size is valid */ + if (size == 0) { + return -EINVAL; + } + + /* Map the device address to our new VA */ + if ((status = vm_map_create(vas, va, addr, PROT_WRITE, size)) != 0) { + return status; + } + + /* + * Mark the memory as uncachable because this is + * for device I/O + */ + if ((status = pmap_set_cache(vmctx, vas, va, VM_CACHE_UC)) != 0) { + return status; + } + + *vap = (void *)va; + return 0; +} diff --git a/sys/include/arch/amd64/bus.h b/sys/include/arch/amd64/bus.h new file mode 100644 index 0000000..53d1fe2 --- /dev/null +++ b/sys/include/arch/amd64/bus.h @@ -0,0 +1,39 @@ +/* + * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team. + * 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 Hyra 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 _AMD64_BUS_H_ +#define _AMD64_BUS_H_ + +#include + +typedef uint64_t bus_addr_t; + +int bus_map(bus_addr_t addr, size_t size, int flags, void **vap); + +#endif /* !_AMD64_BUS_H_ */ -- cgit v1.2.3