From 758ffd773a962c3d2e3f95f0d342d5b5d4ea6f08 Mon Sep 17 00:00:00 2001 From: Ian Moffett Date: Tue, 4 Jun 2024 14:55:49 -0400 Subject: kernel: Add initial virtual memory code Signed-off-by: Ian Moffett --- sys/include/vm/vm.h | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 sys/include/vm/vm.h (limited to 'sys/include/vm') diff --git a/sys/include/vm/vm.h b/sys/include/vm/vm.h new file mode 100644 index 0000000..a4a073f --- /dev/null +++ b/sys/include/vm/vm.h @@ -0,0 +1,42 @@ +/* + * 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_H_ +#define _VM_H_ + +#include +#include + +extern volatile struct limine_hhdm_request g_hhdm_request; + +#define VM_HIGHER_HALF (g_hhdm_request.response->offset) +#define PHYS_TO_VIRT(phys) (void *)((uintptr_t)phys + VM_HIGHER_HALF) +#define VIRT_TO_PHYS(virt) ((uintptr_t)virt - VM_HIGHER_HALF) + +#endif -- cgit v1.2.3