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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* 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.
*
* 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 HOLDER 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.
*/
#pragma once
#include <AK/Types.h>
//#define KMALLOC_DEBUG_LARGE_ALLOCATIONS
#define KMALLOC_SCRUB_BYTE 0xbb
#define KFREE_SCRUB_BYTE 0xaa
void kmalloc_init();
[[gnu::malloc, gnu::returns_nonnull, gnu::alloc_size(1)]] void* kmalloc_impl(size_t);
[[gnu::malloc, gnu::returns_nonnull, gnu::alloc_size(1)]] void* kmalloc_eternal(size_t);
void* krealloc(void*, size_t);
void kfree(void*);
struct kmalloc_stats {
size_t bytes_allocated;
size_t bytes_free;
size_t bytes_eternal;
size_t kmalloc_call_count;
size_t kfree_call_count;
};
void get_kmalloc_stats(kmalloc_stats&);
extern bool g_dump_kmalloc_stacks;
inline void* operator new(size_t, void* p) { return p; }
inline void* operator new[](size_t, void* p) { return p; }
[[gnu::malloc, gnu::returns_nonnull, gnu::alloc_size(1)]] ALWAYS_INLINE void* kmalloc(size_t size)
{
#ifdef KMALLOC_DEBUG_LARGE_ALLOCATIONS
// Any kernel allocation >= 1M is 99.9% a bug.
if (size >= 1048576)
asm volatile("cli;hlt");
#endif
return kmalloc_impl(size);
}
template<size_t ALIGNMENT>
[[gnu::malloc, gnu::returns_nonnull, gnu::alloc_size(1)]] inline void* kmalloc_aligned(size_t size)
{
static_assert(ALIGNMENT > 1);
static_assert(ALIGNMENT < 255);
void* ptr = kmalloc(size + ALIGNMENT + sizeof(u8));
size_t max_addr = (size_t)ptr + ALIGNMENT;
void* aligned_ptr = (void*)(max_addr - (max_addr % ALIGNMENT));
((u8*)aligned_ptr)[-1] = (u8)((u8*)aligned_ptr - (u8*)ptr);
return aligned_ptr;
}
inline void kfree_aligned(void* ptr)
{
kfree((u8*)ptr - ((u8*)ptr)[-1]);
}
void kmalloc_enable_expand();
extern u8* const kmalloc_start;
extern u8* const kmalloc_end;
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