fef
a3941b6dc4
This seems like a huge commit but it's really just renaming a bunch of symbols. The entire mm subsystem is probably gonna have to go through some major changes in the near future, so it's best to start off with something that is not too chaotic i guess.
88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
/* See the end of this file for copyright and license terms. */
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#include <gay/kprintf.h>
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#include <gay/mm.h>
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#include <gay/types.h>
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#include <gay/util.h>
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extern void _image_start_phys;
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extern void _image_end_phys;
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/* these are initialized by pages_init() */
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void *kheap_start;
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void *kheap_end;
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int kmalloc_init(uintptr_t _phys_start, uintptr_t _phys_end)
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{
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phys_start = _phys_start;
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phys_end = _phys_end;
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/*
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* The kernel image is very likely gonna be within the physical memory
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* range, so we're gonna need to do some cropping in order to not hand
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* out pages that actually contain kernel code.
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* Furthermore, somebody should probably clean up this mess somehow.
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*/
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uintptr_t image_start_phys = (uintptr_t)&_image_start_phys;
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uintptr_t image_end_phys = (uintptr_t)&_image_end_phys;
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if (phys_start < image_start_phys && phys_end > image_start_phys) {
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if (image_start_phys - phys_start > phys_end - image_start_phys)
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phys_end = image_start_phys;
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else
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phys_start = image_end_phys;
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}
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if (phys_start < image_end_phys && _phys_end > image_end_phys) {
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if (image_end_phys - phys_start > phys_end - image_end_phys)
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phys_end = image_start_phys;
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else
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phys_start = image_end_phys;
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}
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phys_start = align_ceil(phys_start, HUGEPAGE_SIZE);
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/*
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* This is intentionally not aligned to hugepages, because __early_get_page()
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* shrinks it in single PAGE_SIZE steps whenever it is called anyway.
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* I know, this is a terrible hack, but it will be aligned to a hugepage
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* from within pages_init(), right after the entire physical memory has
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* been mapped to the direct area (which is the only reason we need to
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* be able to allocate pages before the page frame allocator is set up
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* in the first place).
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*/
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phys_end = align_floor(phys_end, PAGE_SIZE);
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int err = pages_init();
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if (err)
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return err;
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slab_init();
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return 0;
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}
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__weak void *malloc(usize size)
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{
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return kmalloc(size, M_KERN);
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}
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__weak void free(void *ptr)
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{
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kfree(ptr);
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}
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/*
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* Looking for kmalloc() and kfree()?
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* Those two are in slab.c for purely organizational reasons.
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*/
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/*
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* This file is part of GayBSD.
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* Copyright (c) 2021 fef <owo@fef.moe>.
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*
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* GayBSD is nonviolent software: you may only use, redistribute, and/or
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* modify it under the terms of the Cooperative Nonviolent Public License
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* (CNPL) as found in the LICENSE file in the source code root directory
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* or at <https://git.pixie.town/thufie/npl-builder>; either version 7
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* of the license, or (at your option) any later version.
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*
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* GayBSD comes with ABSOLUTELY NO WARRANTY, to the extent
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* permitted by applicable law. See the CNPL for details.
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*/
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