virtio_block.h

/* SPDX-License-Identifier: MIT */
/*
 * (c) 2014 Sarah Hoffmann <sarah.hoffmann@kernkonzept.com>
 */
 
#pragma once

 
#include <l4/sys/types.h>

enum L4virtio_block_operations
{
  L4VIRTIO_BLOCK_T_IN      = 0,       
  L4VIRTIO_BLOCK_T_OUT     = 1,       
  L4VIRTIO_BLOCK_T_FLUSH   = 4,       
  L4VIRTIO_BLOCK_T_GET_ID  = 8,       
  L4VIRTIO_BLOCK_T_DISCARD = 11,      
  L4VIRTIO_BLOCK_T_WRITE_ZEROES = 13, 
};

enum L4virtio_block_status
{
  L4VIRTIO_BLOCK_S_OK     = 0, 
  L4VIRTIO_BLOCK_S_IOERR  = 1, 
  L4VIRTIO_BLOCK_S_UNSUPP = 2  
};

typedef struct l4virtio_block_header_t
{
  l4_uint32_t type;   
  l4_uint32_t ioprio; 
  l4_uint64_t sector; 
} l4virtio_block_header_t;
 
enum L4virtio_block_discard_flags_t
{
  L4VIRTIO_BLOCK_DISCARD_F_UNMAP    = 0x00000001UL,
  L4VIRTIO_BLOCK_DISCARD_F_RESERVED = 0xFFFFFFFEUL,
};

typedef struct l4virtio_block_discard_t
{
  l4_uint64_t sector;
  l4_uint32_t num_sectors;
  l4_uint32_t flags;
} l4virtio_block_discard_t;

typedef struct l4virtio_block_config_t
{
  l4_uint64_t capacity;  
  l4_uint32_t size_max;  
  l4_uint32_t seg_max;   
  struct l4virtio_block_config_geometry_t
  {
    l4_uint16_t cylinders;
    l4_uint8_t heads;
    l4_uint8_t sectors;
  } geometry;
  l4_uint32_t blk_size; 
  struct l4virtio_block_config_topology_t
  {
    l4_uint8_t physical_block_exp;
    l4_uint8_t alignment_offset;
    l4_uint16_t min_io_size;
    l4_uint32_t opt_io_size;
  } topology;
  l4_uint8_t writeback;
  l4_uint8_t unused0[1];
  l4_uint16_t num_queues;
  l4_uint32_t max_discard_sectors;
  l4_uint32_t max_discard_seg;
  l4_uint32_t discard_sector_alignment;
  l4_uint32_t max_write_zeroes_sectors;
  l4_uint32_t max_write_zeroes_seg;
  l4_uint8_t write_zeroes_may_unmap;
  l4_uint8_t unused1[3];
} l4virtio_block_config_t;