audk/OvmfPkg/Include/IndustryStandard/QemuFwCfg.h

/** @file
  Macro and type definitions corresponding to the QEMU fw_cfg interface.

  Refer to "docs/specs/fw_cfg.txt" in the QEMU source directory.

  Copyright (c) 2011 - 2013, Intel Corporation. All rights reserved.<BR>
  Copyright (C) 2013 - 2017, Red Hat, Inc.

  SPDX-License-Identifier: BSD-2-Clause-Patent
**/

#ifndef __FW_CFG_H__
#define __FW_CFG_H__

#include <Base.h>

//
// The size, in bytes, of names of firmware configuration files, including at
// least one terminating NUL byte.
//
#define QEMU_FW_CFG_FNAME_SIZE 56

//
// If the following bit is set in the UINT32 fw_cfg revision / feature bitmap
// -- read from key 0x0001 with the basic IO Port or MMIO method --, then the
// DMA interface is available.
//
#define FW_CFG_F_DMA BIT1

//
// Macros for the FW_CFG_DMA_ACCESS.Control bitmap (in native encoding).
//
#define FW_CFG_DMA_CTL_ERROR  BIT0
#define FW_CFG_DMA_CTL_READ   BIT1
#define FW_CFG_DMA_CTL_SKIP   BIT2
#define FW_CFG_DMA_CTL_SELECT BIT3
#define FW_CFG_DMA_CTL_WRITE  BIT4

//
// The fw_cfg registers can be found at these IO Ports, on the IO-mapped
// platforms (Ia32 and X64).
//
#define FW_CFG_IO_SELECTOR    0x510
#define FW_CFG_IO_DATA        0x511
#define FW_CFG_IO_DMA_ADDRESS 0x514

//
// Numerically defined keys.
//
typedef enum {
  QemuFwCfgItemSignature            = 0x0000,
  QemuFwCfgItemInterfaceVersion     = 0x0001,
  QemuFwCfgItemSystemUuid           = 0x0002,
  QemuFwCfgItemRamSize              = 0x0003,
  QemuFwCfgItemGraphicsEnabled      = 0x0004,
  QemuFwCfgItemSmpCpuCount          = 0x0005,
  QemuFwCfgItemMachineId            = 0x0006,
  QemuFwCfgItemKernelAddress        = 0x0007,
  QemuFwCfgItemKernelSize           = 0x0008,
  QemuFwCfgItemKernelCommandLine    = 0x0009,
  QemuFwCfgItemInitrdAddress        = 0x000a,
  QemuFwCfgItemInitrdSize           = 0x000b,
  QemuFwCfgItemBootDevice           = 0x000c,
  QemuFwCfgItemNumaData             = 0x000d,
  QemuFwCfgItemBootMenu             = 0x000e,
  QemuFwCfgItemMaximumCpuCount      = 0x000f,
  QemuFwCfgItemKernelEntry          = 0x0010,
  QemuFwCfgItemKernelData           = 0x0011,
  QemuFwCfgItemInitrdData           = 0x0012,
  QemuFwCfgItemCommandLineAddress   = 0x0013,
  QemuFwCfgItemCommandLineSize      = 0x0014,
  QemuFwCfgItemCommandLineData      = 0x0015,
  QemuFwCfgItemKernelSetupAddress   = 0x0016,
  QemuFwCfgItemKernelSetupSize      = 0x0017,
  QemuFwCfgItemKernelSetupData      = 0x0018,
  QemuFwCfgItemFileDir              = 0x0019,

  QemuFwCfgItemX86AcpiTables        = 0x8000,
  QemuFwCfgItemX86SmbiosTables      = 0x8001,
  QemuFwCfgItemX86Irq0Override      = 0x8002,
  QemuFwCfgItemX86E820Table         = 0x8003,
  QemuFwCfgItemX86HpetData          = 0x8004,

} FIRMWARE_CONFIG_ITEM;

//
// Communication structure for the DMA access method. All fields are encoded in
// big endian.
//
#pragma pack (1)
typedef struct {
  UINT32 Control;
  UINT32 Length;
  UINT64 Address;
} FW_CFG_DMA_ACCESS;
#pragma pack ()

#endif