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/** @file
QEMU/KVM Firmware Configuration access
Copyright (c) 2011 - 2013, Intel Corporation. All rights reserved.<BR>
Copyright (C) 2013, Red Hat, Inc.
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#ifndef __FW_CFG_LIB__
#define __FW_CFG_LIB__
//
// The size, in bytes, of names of firmware configuration files, including at
// least one terminating NUL byte.
//
#define QEMU_FW_CFG_FNAME_SIZE 56
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;
/**
Returns a boolean indicating if the firmware configuration interface
is available or not.
This function may change fw_cfg state.
@retval TRUE The interface is available
@retval FALSE The interface is not available
**/
BOOLEAN
EFIAPI
QemuFwCfgIsAvailable (
VOID
);
/**
Selects a firmware configuration item for reading.
Following this call, any data read from this item will start from
the beginning of the configuration item's data.
@param[in] QemuFwCfgItem - Firmware Configuration item to read
**/
VOID
EFIAPI
QemuFwCfgSelectItem (
IN FIRMWARE_CONFIG_ITEM QemuFwCfgItem
);
/**
Reads firmware configuration bytes into a buffer
If called multiple times, then the data read will
continue at the offset of the firmware configuration
item where the previous read ended.
@param[in] Size - Size in bytes to read
@param[in] Buffer - Buffer to store data into
**/
VOID
EFIAPI
QemuFwCfgReadBytes (
IN UINTN Size,
IN VOID *Buffer OPTIONAL
);
/**
Writes firmware configuration bytes from a buffer
If called multiple times, then the data written will
continue at the offset of the firmware configuration
item where the previous write ended.
@param[in] Size - Size in bytes to write
@param[in] Buffer - Buffer to read data from
**/
VOID
EFIAPI
QemuFwCfgWriteBytes (
IN UINTN Size,
IN VOID *Buffer
);
/**
Reads a UINT8 firmware configuration value
@return Value of Firmware Configuration item read
**/
UINT8
EFIAPI
QemuFwCfgRead8 (
VOID
);
/**
Reads a UINT16 firmware configuration value
@return Value of Firmware Configuration item read
**/
UINT16
EFIAPI
QemuFwCfgRead16 (
VOID
);
/**
Reads a UINT32 firmware configuration value
@return Value of Firmware Configuration item read
**/
UINT32
EFIAPI
QemuFwCfgRead32 (
VOID
);
/**
Reads a UINT64 firmware configuration value
@return Value of Firmware Configuration item read
**/
UINT64
EFIAPI
QemuFwCfgRead64 (
VOID
);
/**
Find the configuration item corresponding to the firmware configuration file.
@param[in] Name - Name of file to look up.
@param[out] Item - Configuration item corresponding to the file, to be passed
to QemuFwCfgSelectItem ().
@param[out] Size - Number of bytes in the file.
@return RETURN_SUCCESS If file is found.
RETURN_NOT_FOUND If file is not found.
RETURN_UNSUPPORTED If firmware configuration is unavailable.
**/
RETURN_STATUS
EFIAPI
QemuFwCfgFindFile (
IN CONST CHAR8 *Name,
OUT FIRMWARE_CONFIG_ITEM *Item,
OUT UINTN *Size
);
/**
Determine if S3 support is explicitly enabled.
@retval TRUE if S3 support is explicitly enabled.
FALSE otherwise. This includes unavailability of the firmware
configuration interface.
**/
BOOLEAN
EFIAPI
QemuFwCfgS3Enabled (
VOID
);
#endif
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