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https://github.com/fergalmoran/ladybird.git
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3cbe805486
The kernel ignored the first 8 MiB of RAM while parsing the memory map because the kmalloc heaps and the super physical pages lived here. Move all that stuff inside the .bss segment so that those memory regions are accounted for, otherwise we risk overwriting boot modules placed next to the kernel.
85 lines
2.9 KiB
C++
85 lines
2.9 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Types.h>
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//#define KMALLOC_DEBUG_LARGE_ALLOCATIONS
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#define KMALLOC_SCRUB_BYTE 0xbb
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#define KFREE_SCRUB_BYTE 0xaa
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void kmalloc_init();
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[[gnu::malloc, gnu::returns_nonnull, gnu::alloc_size(1)]] void* kmalloc_impl(size_t);
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[[gnu::malloc, gnu::returns_nonnull, gnu::alloc_size(1)]] void* kmalloc_eternal(size_t);
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void* krealloc(void*, size_t);
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void kfree(void*);
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struct kmalloc_stats {
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size_t bytes_allocated;
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size_t bytes_free;
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size_t bytes_eternal;
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size_t kmalloc_call_count;
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size_t kfree_call_count;
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};
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void get_kmalloc_stats(kmalloc_stats&);
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extern bool g_dump_kmalloc_stacks;
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inline void* operator new(size_t, void* p) { return p; }
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inline void* operator new[](size_t, void* p) { return p; }
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[[gnu::malloc, gnu::returns_nonnull, gnu::alloc_size(1)]] ALWAYS_INLINE void* kmalloc(size_t size)
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{
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#ifdef KMALLOC_DEBUG_LARGE_ALLOCATIONS
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// Any kernel allocation >= 1M is 99.9% a bug.
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if (size >= 1048576)
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asm volatile("cli;hlt");
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#endif
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return kmalloc_impl(size);
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}
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template<size_t ALIGNMENT>
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[[gnu::malloc, gnu::returns_nonnull, gnu::alloc_size(1)]] inline void* kmalloc_aligned(size_t size)
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{
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static_assert(ALIGNMENT > 1);
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static_assert(ALIGNMENT < 255);
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void* ptr = kmalloc(size + ALIGNMENT + sizeof(u8));
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size_t max_addr = (size_t)ptr + ALIGNMENT;
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void* aligned_ptr = (void*)(max_addr - (max_addr % ALIGNMENT));
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((u8*)aligned_ptr)[-1] = (u8)((u8*)aligned_ptr - (u8*)ptr);
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return aligned_ptr;
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}
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inline void kfree_aligned(void* ptr)
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{
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kfree((u8*)ptr - ((u8*)ptr)[-1]);
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}
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void kmalloc_enable_expand();
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