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https://github.com/SerenityOS/serenity
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ddea37b521
Reduce inclusion of limits.h as much as possible at the same time. This does mean that kmalloc.h is now including Kernel/API/POSIX/limits.h instead of LibC/limits.h, but the scope could be limited a lot more. Basically every file in the kernel includes kmalloc.h, and needs the limits.h include for PAGE_SIZE.
87 lines
3.6 KiB
C++
87 lines
3.6 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Types.h>
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#include <Kernel/API/POSIX/sys/limits.h> // For PAGE_SIZE. Everyone needs PAGE_SIZE
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#define KMALLOC_SCRUB_BYTE 0xbb
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#define KFREE_SCRUB_BYTE 0xaa
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#define MAKE_ALIGNED_ALLOCATED(type, alignment) \
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public: \
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[[nodiscard]] void* operator new(size_t) \
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{ \
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void* ptr = kmalloc_aligned(sizeof(type), alignment); \
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VERIFY(ptr); \
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return ptr; \
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} \
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[[nodiscard]] void* operator new(size_t, std::nothrow_t const&) noexcept \
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{ \
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return kmalloc_aligned(sizeof(type), alignment); \
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} \
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void operator delete(void* ptr) noexcept \
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{ \
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kfree_sized(ptr, sizeof(type)); \
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} \
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\
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private:
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// The C++ standard specifies that the nothrow allocation tag should live in the std namespace.
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// Otherwise, `new (std::nothrow)` calls wouldn't get resolved.
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namespace std { // NOLINT(cert-dcl58-cpp) These declarations must be in ::std and we are not using <new>
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struct nothrow_t {
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explicit nothrow_t() = default;
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};
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extern const nothrow_t nothrow;
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enum class align_val_t : size_t {};
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};
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void kmalloc_init();
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void kfree_sized(void*, size_t);
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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 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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[[nodiscard]] void* operator new(size_t size);
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[[nodiscard]] void* operator new(size_t size, std::nothrow_t const&) noexcept;
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[[nodiscard]] void* operator new(size_t size, std::align_val_t);
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[[nodiscard]] void* operator new(size_t size, std::align_val_t, std::nothrow_t const&) noexcept;
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void operator delete(void* ptr) noexcept DISALLOW("All deletes in the kernel should have a known size.");
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void operator delete(void* ptr, size_t) noexcept;
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void operator delete(void* ptr, std::align_val_t) noexcept DISALLOW("All deletes in the kernel should have a known size.");
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void operator delete(void* ptr, size_t, std::align_val_t) noexcept;
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[[nodiscard]] void* operator new[](size_t size);
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[[nodiscard]] void* operator new[](size_t size, std::nothrow_t const&) noexcept;
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void operator delete[](void* ptrs) noexcept DISALLOW("All deletes in the kernel should have a known size.");
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void operator delete[](void* ptr, size_t) noexcept;
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[[gnu::malloc, gnu::alloc_size(1)]] void* kmalloc(size_t);
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[[gnu::malloc, gnu::alloc_size(1, 2)]] void* kcalloc(size_t, size_t);
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[[gnu::malloc, gnu::alloc_size(1), gnu::alloc_align(2)]] void* kmalloc_aligned(size_t size, size_t alignment);
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size_t kmalloc_good_size(size_t);
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void kmalloc_enable_expand();
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