bzimage

package
v1.0.0-...-3f8fdb0 Latest Latest
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 Go to latest Published: Aug 31, 2018 License: BSD-3-Clause Imports: 6 Imported by: 0

Documentation

Overview

package bzImage implements encoding.UnmarshalBinary for bzImage files. The bzImage struct contains all the information about the file and can be used to create a new bzImage.

These are the semi-documented things that define a bzImage Thanks to coreboot for documenting the basic layout.

Index

Constants

View Source 
const (
	Ram      e820type = 1
	Reserved          = 2
	ACPI              = 3
	NVS               = 4
)
View Source 
const (
	NotSet    boottype = 0
	LoadLin            = 1
	BootSect           = 2
	SysLinux           = 3
	EtherBoot          = 4
	Kernel             = 5
)
View Source 
const (
	RamdiskStartMask = 0x07FF
	Prompt           = 0x8000
	Load             = 0x4000

	CommandLineMagic = 0x7ff
	CommandLineSize  = 256

	DefaultInitrdAddrMax  = 0x37FFFFFF
	DefaultBzimageAddrMax = 0x37FFFFFF

	E820Max = 128
	E820Map = 0x2d0
	E820NR  = 0x1e8
)
View Source 
const (
	EDDMBRSigMax       = 16
	EDDMaxNR           = 6 /* number of edd_info structs starting at EDDBUF  */
	EDDDeviceParamSize = 74
)
View Source 
const (
	EDDExtFixedDiskAccess = 1 << iota
	EDDExtDeviceLockingAndEjecting
	EDDExtEnhancedDiskDriveSupport
	EDDExt64BitExtensions
)

Variables

View Source 
var (
	LoaderType = map[boottype]string{
		NotSet:    "Not set",
		LoadLin:   "loadlin",
		BootSect:  "bootsector",
		SysLinux:  "syslinux",
		EtherBoot: "etherboot",
		Kernel:    "kernel (kexec)",
	}
	E820 = map[e820type]string{
		Ram:      "Ram",
		Reserved: "Reserved",
		ACPI:     "ACPI",
		NVS:      "NVS",
	}
	HeaderMagic = [4]uint8{'H', 'd', 'r', 'S'}
)
View Source 
var Debug = func(string, ...interface{}) {}

Functions

func Equal 

func Equal(a, b []byte) error

func MakeLinuxHeader 

func MakeLinuxHeader(h *LinuxHeader) ([]byte, error)

MakeLinuxHeader marshals a LinuxHeader into a []byte.

Types

type BzImage 

type BzImage struct {
	Header       LinuxHeader
	BootCode     []byte
	Kernel       []byte
	KernelBase   uintptr
	KernelOffset uintptr
	// todo: allow more than one?
	InitRAMFS []byte
}

func (*BzImage) AddInitRAMFS 

func (b *BzImage) AddInitRAMFS(s string) error

func (*BzImage) MarshalBinary 

func (b *BzImage) MarshalBinary() ([]byte, error)

MarshalBinary implements the encoding.BinaryMarshaler interface.

func (*BzImage) UnmarshalBinary 

func (b *BzImage) UnmarshalBinary(d []byte) error

UnmarshalBinary implements the encoding.BinaryUnmarshaler interface. For now, it hardwires the KernelBase to 0x100000.

type E820Entry 

type E820Entry struct {
	Addr    uint64
	Size    uint64
	MemType e820type
}

type EDDInfo 

type EDDInfo struct {
	Device                uint8
	Version               uint8
	InterfaceSupport      uint16
	LegacyMaxCylinder     uint16
	LegacyMaxHead         uint8
	LegacySectorsPerTrace uint8
	EDDDeviceParams       [EDDDeviceParamSize]uint8
}

type LinuxHeader 

type LinuxHeader struct {
	MBRCode         [0xc0]uint8 `offset:"0x000"`
	ExtRamdiskImage uint32      `offset:"0xc0"`
	ExtRamdiskSize  uint32      `offset:"0xc4"`
	ExtCmdlinePtr   uint32      `offset:"0xc8"`

	SetupSects      uint8  `offset:"0x1f1"`
	RootFlags       uint16 `offset:"0x1f2"`
	Syssize         uint32 `offset:"0x1f4"` //(2.04+)
	RamSize         uint16 `offset:"0x1f8"`
	Vidmode         uint16 `offset:"0x1fa"`
	RootDev         uint16 `offset:"0x1fc"`
	Bootsectormagic uint16 `offset:"0x1fe"`
	// 0.00+
	Jump            uint16   `offset:"0x200"`
	HeaderMagic     [4]uint8 `offset:"0x202"`
	Protocolversion uint16   `offset:"0x206"`
	RealModeSwitch  uint32   `offset:"0x208"`
	StartSys        uint16   `offset:"0x20c"`
	Kveraddr        uint16   `offset:"0x20e"`
	TypeOfLoader    uint8    `offset:"0x210"`
	Loadflags       uint8    `offset:"0x211"`
	Setupmovesize   uint16   `offset:"0x212"`
	Code32Start     uint32   `offset:"0x214"`
	RamDiskImage    uint32   `offset:"0x218"`
	RamDiskSize     uint32   `offset:"0x21c"`
	BootSectKludge  [4]uint8 `offset:"0x220"`
	// 2.01+
	Heapendptr    uint16 `offset:"0x224"`
	ExtLoaderVer  uint8  `offset:"0x226"`
	ExtLoaderType uint8  `offset:"0x227"`
	// 2.02+
	Cmdlineptr uint32 `offset:"0x228"`
	// 2.03+
	InitrdAddrMax uint32 `offset:"0x22c"`
	// 2.05+
	Kernelalignment   uint32 `offset:"0x230"`
	RelocatableKernel uint8  `offset:"0x234"`
	MinAlignment      uint8  `offset:"0x235"` //(2.10+)
	XLoadFlags        uint16 `offset:"0x236"`
	// 2.06+
	CmdLineSize uint32 `offset:"0x238"`
	// 2.07+
	HardwareSubArch     uint32 `offset:"0x23c"`
	HardwareSubArchData uint64 `offset:"0x240"`
	// 2.08+
	PayloadOffset uint32 `offset:"0x248"`
	PayloadSize   uint32 `offset:"0x24c"`
	// 2.09+
	SetupData uint64 `offset:"0x250"`
	// 2.10+
	PrefAddress    uint64 `offset:"0x258"`
	InitSize       uint32 `offset:"0x260"`
	HandoverOffset uint32 `offset:"0x264"`
	// contains filtered or unexported fields
}

The header of Linux/i386 kernel

func (*LinuxHeader) Diff 

func (h *LinuxHeader) Diff(i *LinuxHeader) string

Diff is a convenience function that returns a string showing differents between a header and another header.

func (*LinuxHeader) Show 

func (h *LinuxHeader) Show() []string

Show stringifies a LinuxHeader into a []string

func (*LinuxHeader) String 

func (h *LinuxHeader) String() string

String stringifies a LinuxHeader into comma-separated parts

type LinuxParams 

type LinuxParams struct {
	Origx         uint8  `offset:"0x00"`
	Origy         uint8  `offset:"0x01"`
	ExtMemK       uint16 `offset:"0x02"` //-- EXTMEMK sits here
	OrigVideoPage uint16 `offset:"0x04"`
	OrigVideoMode uint8  `offset:"0x06"`
	OrigVideoCols uint8  `offset:"0x07"`

	OrigVideoeGabx uint16 `offset:"0x0a"`

	OrigVideoLines  uint8  `offset:"0x0e"`
	OrigVideoIsVGA  uint8  `offset:"0x0f"`
	OrigVideoPoints uint16 `offset:"0x10"`

	// VESA graphic mode -- linear frame buffer
	Lfbwidth      uint16 `offset:"0x12"`
	Lfbheight     uint16 `offset:"0x14"`
	Lfbdepth      uint16 `offset:"0x16"`
	Lfbbase       uint32 `offset:"0x18"`
	Lfbsize       uint32 `offset:"0x1c"`
	CLMagic       uint16 `offset:"0x20"` // DON'T USE
	CLOffset      uint16 `offset:"0x22"` // DON'T USE
	Lfblinelength uint16 `offset:"0x24"`
	Redsize       uint8  `offset:"0x26"`
	Redpos        uint8  `offset:"0x27"`
	Greensize     uint8  `offset:"0x28"`
	Greenpos      uint8  `offset:"0x29"`
	Bluesize      uint8  `offset:"0x2a"`
	Bluepos       uint8  `offset:"0x2b"`
	Rsvdsize      uint8  `offset:"0x2c"`
	Rsvdpos       uint8  `offset:"0x2d"`
	Vesapmseg     uint16 `offset:"0x2e"`
	Vesapmoff     uint16 `offset:"0x30"`
	Pages         uint16 `offset:"0x32"`

	//struct apmbiosinfo apmbiosinfo;
	Apmbiosinfo [0x40]uint8 `offset:"0x40"`
	//struct driveinfostruct driveinfo;
	Driveinfo [0x20]uint8 `offset:"0x80"`
	//struct sysdesctable sysdesctable;
	Sysdesctable [0x140]uint8 `offset:"0xa0"`
	Altmemk      uint32       `offset:"0x1e0"`

	E820MapNr uint8 `offset:"0x1e8"`

	MountRootReadonly uint16 `offset:"0x1f2"`

	Ramdiskflags uint16 `offset:"0x1f8"`

	OrigRootDev uint16 `offset:"0x1fc"`

	Auxdeviceinfo uint8 `offset:"0x1ff"`

	Paramblocksignature [4]uint8 `offset:"0x202"`
	Paramblockversion   uint16   `offset:"0x206"`

	LoaderType  uint8 `offset:"0x210"`
	Loaderflags uint8 `offset:"0x211"`

	KernelStart uint32 `offset:"0x214"`
	Initrdstart uint32 `offset:"0x218"`
	Initrdsize  uint32 `offset:"0x21c"`

	CLPtr         uint32 `offset:"0x228"` // USE THIS.
	InitrdAddrMax uint32 `offset:"0x22c"`
	/* 2.04+ */
	KernelAlignment uint32 `offset:"0x230"`

	MinAlignment        uint8  `offset:"0x235"`
	XLoadFlags          uint16 `offset:"0x236"`
	CmdLineSize         uint32 `offset:"0x238"`
	HardwareSubarch     uint32 `offset:"0x23C"`
	HardwareSubarchData uint64 `offset:"0x240"`
	Payload_Ofset       uint32 `offset:"0x248"`
	PayloadLength       uint32 `offset:"0x24C"`
	SetupData           uint64 `offset:"0x250"`
	PrefAddress         uint64 `offset:"0x258"`
	InitSize            uint32 `offset:"0x260"`
	HandoverOffset      uint32 `offset:"0x264"`

	EDDMBRSigBuffer [EDDMBRSigMax]uint32 `offset:"0x290"`
	// e820map is another cockup from the usual suspects.
	// Go rounds the size to something reasonable. Oh well. No checking for you.
	// So the next two offsets are bogus, sorry about that.
	E820Map [E820Max]E820Entry `offset:"0x2d0"`

	EDDBuf [EDDMaxNR]EDDInfo `offset:"0xf00"` // `offset:"0xd00"`
	// contains filtered or unexported fields
}

Paramters passed to 32-bit part of Linux

Source Files

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