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ealanos: Added helper methods to ease the use of memory blocks and superblocks.

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This commit is contained in:
Michael Mueller
2025-04-25 19:42:09 +02:00
parent 3d20264caa
commit 8cc04bf343
1 changed files with 21 additions and 5 deletions
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26
repos/ealanos/include/ealanos/memory/superblock.h
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@@ -48,6 +48,7 @@ class Ealan::Memory::Block
{
public:
void *_superblock{nullptr}; /* Pointer to the superblock, this block was allocated from. */
Genode::size_t _alignment{0};
void *_block_start; /* Placeholder for marking the start of the usable area of this block. */
/**
@@ -55,7 +56,7 @@ class Ealan::Memory::Block
*
* @param sb - Pointer to the superblock this block was allocated from
*/
Block(void *sb) : _superblock(sb), _block_start{nullptr} {}
Block(void *sb, Genode::size_t align) : _superblock(sb), _alignment(align), _block_start{nullptr} {}
/**
* @brief Creates a new block at the address pointed to by p
@@ -64,6 +65,16 @@ class Ealan::Memory::Block
* @return void* - pointer to the new block
*/
void *operator new(Genode::size_t, void *p) { return p; }
/**
* @brief Return a pointer to the metadata of this block
*
* @param ptr - application-facing pointer for which to request the metadata
* @return Block* - pointer to the Block datastructure containing the metadata
*/
static Block *metadata(void *ptr) {
return reinterpret_cast<Block *>(reinterpret_cast<Genode::addr_t>(ptr) - sizeof(Genode::size_t) - sizeof(void *));
}
};
/**
@@ -82,7 +93,7 @@ class Ealan::Memory::Superblock : public Hyperblock
private:
Genode::size_t _size_class{0}; /* actual size of the blocks in this superblock */
Bit_alloc<0, SIZE/BASE> _alloc; /* Bit allocator to allocate blocks from this superblock */
alignas(BASE) Block _block_start[]; /* Marker for the end of the metadata portion */
Block _block_start[]; /* Marker for the end of the metadata portion */
public:
Superblock(Genode::size_t sz) : _size_class(sz), _alloc(SIZE / _size_class)
@@ -101,7 +112,7 @@ class Ealan::Memory::Superblock : public Hyperblock
return nullptr;
Genode::addr_t block_addr = reinterpret_cast<Genode::addr_t>(_block_start) + idx * _size_class;
Block *block = new (reinterpret_cast<void *>(block_addr)) Block(this);
Block *block = new (reinterpret_cast<void *>(block_addr)) Block(this, 0);
return &block->_block_start;
}
@@ -113,8 +124,9 @@ class Ealan::Memory::Superblock : public Hyperblock
*/
void *aligned_alloc(Genode::size_t alignment = 64) {
void *ptr = alloc();
Genode::addr_t base_ptr = reinterpret_cast<Genode::addr_t>(ptr) - sizeof(void *);
return reinterpret_cast<void *>(base_ptr + alignment);
Genode::addr_t base_ptr = reinterpret_cast<Genode::addr_t>(ptr) - sizeof(Genode::size_t) - sizeof(void *);
reinterpret_cast<Block *>(base_ptr)->_alignment = alignment;
return reinterpret_cast<void *>(reinterpret_cast<Genode::addr_t>(ptr) + alignment);
}
/**
@@ -154,6 +166,10 @@ class Ealan::Memory::Superblock : public Hyperblock
* @return void* - Pointer to the new superblock.
*/
void *operator new(Genode::size_t, void *p) { return p; }
Superblock<SIZE, BASE> *next() { return static_cast<Superblock<SIZE, BASE> *>(_next); }
void next(Superblock<SIZE, BASE> *sb) { _next = static_cast<Hyperblock *>(sb); }
};
#endif /* __INCLUDE__EALANOS__MEMORY__SUPERBLOCK_H_ */