Justin C. Miller
0e0975e5f6
Finished the VMA kobject and added the related syscalls. Processes can now allocate memory! Other changes in this commit: - stop using g_frame_allocator and add frame_allocator::get() - make sure to release all handles in the process dtor - fix kutil::map::iterator never comparing to end()
55 lines
1.5 KiB
C++
55 lines
1.5 KiB
C++
#pragma once
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/// \file frame_allocator.h
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/// Allocator for physical memory frames
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#include <stdint.h>
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#include "kutil/linked_list.h"
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struct frame_block;
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using frame_block_list = kutil::linked_list<frame_block>;
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/// Allocator for physical memory frames
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class frame_allocator
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{
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public:
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/// Default constructor
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frame_allocator();
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/// Get free frames from the free list. Only frames from the first free block
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/// are returned, so the number may be less than requested, but they will
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/// be contiguous.
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/// \arg count The maximum number of frames to get
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/// \arg address [out] The physical address of the first frame
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/// \returns The number of frames retrieved
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size_t allocate(size_t count, uintptr_t *address);
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/// Free previously allocated frames.
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/// \arg address The physical address of the first frame to free
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/// \arg count The number of frames to be freed
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void free(uintptr_t address, size_t count);
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/// Get the global frame allocator
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static frame_allocator & get();
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private:
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frame_block_list m_free; ///< Free frames list
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frame_allocator(const frame_allocator &) = delete;
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};
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/// A block of contiguous frames. Each `frame_block` represents contiguous
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/// physical frames with the same attributes.
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struct frame_block
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{
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uintptr_t address;
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uint32_t count;
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/// Compare two blocks by address.
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/// \arg rhs The right-hand comparator
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/// \returns <0 if this is sorts earlier, >0 if this sorts later, 0 for equal
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int compare(const frame_block &rhs) const;
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};
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