diff options
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/include/vm/map.h | 38 | ||||
| -rw-r--r-- | sys/vm/vm_map.c | 124 |
2 files changed, 162 insertions, 0 deletions
diff --git a/sys/include/vm/map.h b/sys/include/vm/map.h new file mode 100644 index 0000000..679831b --- /dev/null +++ b/sys/include/vm/map.h @@ -0,0 +1,38 @@ +/* + * 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 _VM_MMAP_H_ +#define _VM_MMAP_H_ + +#include <sys/types.h> +#include <vm/pmap.h> + +int vm_map_create(vaddr_t va, paddr_t pa, vm_prot_t prot, size_t bytes); + +#endif /* !_VM_MMAP_H_ */ diff --git a/sys/vm/vm_map.c b/sys/vm/vm_map.c new file mode 100644 index 0000000..0002dde --- /dev/null +++ b/sys/vm/vm_map.c @@ -0,0 +1,124 @@ +/* + * 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 <vm/map.h> +#include <vm/vm.h> +#include <vm/pmap.h> +#include <sys/types.h> +#include <sys/cdefs.h> +#include <sys/panic.h> +#include <lib/assert.h> + +/* + * Internal routine for cleaning up. + * + * @va: VA to start unmapping at. + * @bytes_aligned: Amount of bytes to unmap. + * + * XXX DANGER!!: `bytes_aligned' is expected to be aligned by the + * machine's page granule. If this is not so, + * undefined behaviour will occur. This will + * be enforced via a panic. + */ +static void +vm_map_cleanup(struct vm_ctx *ctx, vaddr_t va, size_t bytes_aligned, + size_t granule) +{ + __assert(bytes_aligned != 0); + __assert((bytes_aligned & (granule - 1)) == 0); + + for (size_t i = 0; i < bytes_aligned; i += 0x1000) { + if (pmap_unmap(ctx, va + i) != 0) { + /* + * XXX: This shouldn't happen... If it somehow does, + * then this should be handled. + */ + panic("Could not cleanup!!!\n"); + } + } +} + +/* + * Create a virtual memory mappings in the current + * address space. + * + * @va: Virtual address. + * @pa: Physical address. + * @prot: Protection flags. + * @bytes: Amount of bytes to be mapped. This is aligned by the + * machine's page granule, typically a 4k boundary. + */ +int +vm_map_create(vaddr_t va, paddr_t pa, vm_prot_t prot, size_t bytes) +{ + size_t granule = vm_get_page_size(); + int s; + + /* + * TODO: This needs to be changed, once vm_get_bsp_ctx() + * is no longer used, we'll need to fetch it from + * the current process! + */ + struct vm_ctx *ctx = vm_get_bsp_ctx(); + + /* We want bytes to be aligned by the granule */ + bytes = __ALIGN_UP(bytes, granule); + + /* + * The VA and PA must be aligned by the granule as well. + * However, it is a terrible idea to do this ourselves + * as that could introduce very hard to find bugs... + * If one of them aren't aligned, the caller most likely + * screwed something up and silently continuing would be + * a terrible thing! The offset of the addresses should be 0, + * i.e., we should be at the very beginning of the page. + */ + if ((va & (granule - 1)) != 0) { + return -1; + } + if ((pa & (granule - 1)) != 0) { + return -1; + } + + if (bytes == 0) { + /* You can't map 0 pages, silly! */ + return -1; + } + + for (uintptr_t i = 0; i < bytes; i += granule) { + s = pmap_map(ctx, va + i, pa + i, prot); + if (s != 0) { + /* Something went a bit wrong here, cleanup */ + vm_map_cleanup(ctx, va, i, bytes); + return -1; + } + } + + return 0; +} |