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header.go
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header.go
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// Copyright 2015-2018 the u-root Authors. All rights reserved
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// These are the semi-documented things that define a bzImage
// Thanks to coreboot for documenting the basic layout.
package bzimage
const (
Ram e820type = 1
Reserved = 2
ACPI = 3
NVS = 4
)
const (
NotSet boottype = 0
LoadLin = 1
BootSect = 2
SysLinux = 3
EtherBoot = 4
Kernel = 5
)
const (
RamdiskStartMask = 0x07FF
Prompt = 0x8000
Load = 0x4000
CommandLineMagic = 0x7ff
CommandLineSize = 256
DefaultInitrdAddrMax = 0x37FFFFFF
DefaultBzimageAddrMax = 0x37FFFFFF
E820Max = 128
E820Map = 0x2d0
E820NR = 0x1e8
)
// what's an EDD? No idea.
/*
* EDD stuff
*/
const (
EDDMBRSigMax = 16
EDDMaxNR = 6 /* number of edd_info structs starting at EDDBUF */
EDDDeviceParamSize = 74
)
const (
EDDExtFixedDiskAccess = 1 << iota
EDDExtDeviceLockingAndEjecting
EDDExtEnhancedDiskDriveSupport
EDDExt64BitExtensions
)
type EDDInfo struct {
Device uint8
Version uint8
InterfaceSupport uint16
LegacyMaxCylinder uint16
LegacyMaxHead uint8
LegacySectorsPerTrace uint8
EDDDeviceParams [EDDDeviceParamSize]uint8
}
type e820type uint32
type boottype uint8
type E820Entry struct {
Addr uint64
Size uint64
MemType e820type
}
// The header of Linux/i386 kernel
type LinuxHeader struct {
MBRCode [0xc0]uint8 `offset:"0x000"`
ExtRamdiskImage uint32 `offset:"0xc0"`
ExtRamdiskSize uint32 `offset:"0xc4"`
ExtCmdlinePtr uint32 `offset:"0xc8"`
_ [0x1f1 - 0xcc]uint8 `offset:"0xcc"`
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"`
}
// Paramters passed to 32-bit part of Linux
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"`
_ uint16 `offset:"0x08"`
OrigVideoeGabx uint16 `offset:"0x0a"`
_ uint16 `offset:"0x0c"`
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"`
_ [12]uint8 `offset:"0x34"` //-- 0x3f reserved for future expansion
//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"`
_ [4]uint8 `offset:"0x1e4"`
E820MapNr uint8 `offset:"0x1e8"`
_ [9]uint8 `offset:"0x1e9"`
MountRootReadonly uint16 `offset:"0x1f2"`
_ [4]uint8 `offset:"0x1f4"`
Ramdiskflags uint16 `offset:"0x1f8"`
_ [2]uint8 `offset:"0x1fa"`
OrigRootDev uint16 `offset:"0x1fc"`
_ [1]uint8 `offset:"0x1fe"`
Auxdeviceinfo uint8 `offset:"0x1ff"`
_ [2]uint8 `offset:"0x200"`
Paramblocksignature [4]uint8 `offset:"0x202"`
Paramblockversion uint16 `offset:"0x206"`
_ [8]uint8 `offset:"0x208"`
LoaderType uint8 `offset:"0x210"`
Loaderflags uint8 `offset:"0x211"`
_ [2]uint8 `offset:"0x212"`
KernelStart uint32 `offset:"0x214"`
Initrdstart uint32 `offset:"0x218"`
Initrdsize uint32 `offset:"0x21c"`
_ [8]uint8 `offset:"0x220"`
CLPtr uint32 `offset:"0x228"` // USE THIS.
InitrdAddrMax uint32 `offset:"0x22c"`
/* 2.04+ */
KernelAlignment uint32 `offset:"0x230"`
elocatableKernel uint8 `offset:"0x234"`
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"`
_ [0x290 - 0x268]uint8 `offset:"0x268"`
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"`
// we lie.
_ [48]uint8 `offset:"0xed0"` // `offset:"0xcd0"`
EDDBuf [EDDMaxNR]EDDInfo `offset:"0xf00"` // `offset:"0xd00"`
}
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'}
)
type BzImage struct {
Header LinuxHeader
BootCode []byte
Kernel []byte
KernelBase uintptr
KernelOffset uintptr
// todo: allow more than one?
InitRAMFS []byte
}