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/** @file
Command structures for the QEMU FwCfg table loader interface.
Copyright (C) 2014, Red Hat, Inc.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef QEMU_LOADER_H_
#define QEMU_LOADER_H_
#include <Base.h>
#include <IndustryStandard/QemuFwCfg.h>
//
// The types and the documentation reflects the SeaBIOS interface.
//
#define QEMU_LOADER_FNAME_SIZE QEMU_FW_CFG_FNAME_SIZE
typedef enum {
QemuLoaderCmdAllocate = 1,
QemuLoaderCmdAddPointer,
QemuLoaderCmdAddChecksum,
QemuLoaderCmdWritePointer,
} QEMU_LOADER_COMMAND_TYPE;
typedef enum {
QemuLoaderAllocHigh = 1,
QemuLoaderAllocFSeg
} QEMU_LOADER_ALLOC_ZONE;
#pragma pack (1)
//
// QemuLoaderCmdAllocate: download the fw_cfg file named File, to a buffer
// allocated in the zone specified by Zone, aligned at a multiple of Alignment.
//
typedef struct {
UINT8 File[QEMU_LOADER_FNAME_SIZE]; // NUL-terminated
UINT32 Alignment; // power of two
UINT8 Zone; // QEMU_LOADER_ALLOC_ZONE values
} QEMU_LOADER_ALLOCATE;
//
// QemuLoaderCmdAddPointer: the bytes at
// [PointerOffset..PointerOffset+PointerSize) in the file PointerFile contain a
// relative pointer (an offset) into PointeeFile. Increment the relative
// pointer's value by the base address of where PointeeFile's contents have
// been placed (when QemuLoaderCmdAllocate has been executed for PointeeFile).
//
typedef struct {
UINT8 PointerFile[QEMU_LOADER_FNAME_SIZE]; // NUL-terminated
UINT8 PointeeFile[QEMU_LOADER_FNAME_SIZE]; // NUL-terminated
UINT32 PointerOffset;
UINT8 PointerSize; // one of 1, 2, 4, 8
} QEMU_LOADER_ADD_POINTER;
//
// QemuLoaderCmdAddChecksum: calculate the UINT8 checksum (as per
// CalculateChecksum8()) of the range [Start..Start+Length) in File. Store the
// UINT8 result at ResultOffset in the same File.
//
typedef struct {
UINT8 File[QEMU_LOADER_FNAME_SIZE]; // NUL-terminated
UINT32 ResultOffset;
UINT32 Start;
UINT32 Length;
} QEMU_LOADER_ADD_CHECKSUM;
//
// QemuLoaderCmdWritePointer: the bytes at
// [PointerOffset..PointerOffset+PointerSize) in the writeable fw_cfg file
// PointerFile are to receive the absolute address of PointeeFile, as allocated
// and downloaded by the firmware, incremented by the value of PointeeOffset.
// Store the sum of (a) the base address of where PointeeFile's contents have
// been placed (when QemuLoaderCmdAllocate has been executed for PointeeFile)
// and (b) PointeeOffset, to this portion of PointerFile.
//
// This command is similar to QemuLoaderCmdAddPointer; the difference is that
// the "pointer to patch" does not exist in guest-physical address space, only
// in "fw_cfg file space". In addition, the "pointer to patch" is not
// initialized by QEMU in-place with a possibly nonzero offset value: the
// relative offset into PointeeFile comes from the explicit PointeeOffset
// field.
//
typedef struct {
UINT8 PointerFile[QEMU_LOADER_FNAME_SIZE]; // NUL-terminated
UINT8 PointeeFile[QEMU_LOADER_FNAME_SIZE]; // NUL-terminated
UINT32 PointerOffset;
UINT32 PointeeOffset;
UINT8 PointerSize; // one of 1, 2, 4, 8
} QEMU_LOADER_WRITE_POINTER;
typedef struct {
UINT32 Type; // QEMU_LOADER_COMMAND_TYPE values
union {
QEMU_LOADER_ALLOCATE Allocate;
QEMU_LOADER_ADD_POINTER AddPointer;
QEMU_LOADER_ADD_CHECKSUM AddChecksum;
QEMU_LOADER_WRITE_POINTER WritePointer;
UINT8 Padding[124];
} Command;
} QEMU_LOADER_ENTRY;
#pragma pack ()
#endif
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