47 lines
1.6 KiB
C++
47 lines
1.6 KiB
C++
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#pragma once
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#include "blockdevice.hpp"
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namespace helos {
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// Ramdisk is a block device residing in runtime RAM.
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class BlockDeviceRamdisk: public BlockDevice {
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public:
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BlockDeviceRamdisk(const BlockDeviceRamdisk &) = delete; // Don't copy by value
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BlockDeviceRamdisk(BlockDeviceRamdisk &&) = delete;
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const BlockDeviceRamdisk &operator=(const BlockDeviceRamdisk &) = delete;
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public:
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// Creates new, empty (all zero) ramdisk, allocating from kernel memory
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BlockDeviceRamdisk(uint64_t blockSize, uint64_t blockCount, ::helos::Permission perm);
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// Creates a Ramdisk wrapper from an existing buffer
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// Size of the buffer must be a multiple of BlockSize
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BlockDeviceRamdisk(void *buffer, uint64_t blockSize, uint64_t blockCount, ::helos ::Permission perm);
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~BlockDeviceRamdisk();
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public:
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uint64_t BlockSize() const override { return blocksize; }
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uint64_t Size() const override { return blockcount; }
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uint64_t SizeBytes() const override { return blocksize * blockcount; }
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::helos::Permission Permission() const override { return perm; }
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uint64_t ReadBlock(uint64_t blockOffset, void *data, uint64_t blockCount) const override;
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uint64_t WriteBlock(uint64_t blockOffset, const void *data, uint64_t blockCount) override;
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public:
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// Buffer returns the underlying buffer.
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void *Buffer() { return buffer; }
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private:
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uint64_t blocksize, blockcount;
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void * buffer;
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int pages; // Number of pages allocated in 4K or 2M paging allocation
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::helos::Permission perm;
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uint16_t alloctype; // Type of the buffer allocated
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};
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} // namespace helos
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