block.h

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// kernel/drivers/blk/block.h
#ifndef X86_KERNEL_DRIVER_BLK_BLOCK_H
#define X86_KERNEL_DRIVER_BLK_BLOCK_H
 
// Standard headers, required.
#include <stddef.h>
#include <stdbool.h>
#include <stdint.h>
#include "../../mtstatus.h"
 
typedef struct _BLOCK_DEVICE {
    MTSTATUS(*read_sector)(struct _BLOCK_DEVICE* dev,
        uint32_t lba,
        void* buf,
        size_t bytes);
    MTSTATUS(*write_sector)(struct _BLOCK_DEVICE* dev,
        uint32_t lba,
        const void* buf,
        size_t bytes);
    void* dev_data;
} BLOCK_DEVICE;
 
/* Register a block device so `get_block_device()` can find it */
void register_block_device(BLOCK_DEVICE* dev);
 
/* Get the "n" registered device (0, 1, ...), or NULL if out of range. */
BLOCK_DEVICE* get_block_device(int index);
 
#endif // X86_KERNEL_DRIVER_BLK_BLOCK_H