/*
 *  FreeLoader
 *  Copyright (C) 1998-2003  Brian Palmer  <brianp@sginet.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <fs.h>

#ifndef __LINUX_H
#define __LINUX_H


#define LINUX_LOADER_TYPE_LILO			0x01
#define LINUX_LOADER_TYPE_LOADLIN		0x11
#define LINUX_LOADER_TYPE_BOOTSECT		0x21
#define LINUX_LOADER_TYPE_SYSLINUX		0x31
#define	LINUX_LOADER_TYPE_ETHERBOOT		0x41
#define LINUX_LOADER_TYPE_FREELOADER	0x81

#define LINUX_COMMAND_LINE_MAGIC		0xA33F

#define LINUX_SETUP_HEADER_ID			0x53726448			// 'HdrS'

#define LINUX_BOOT_SECTOR_MAGIC			0xAA55

#define LINUX_KERNEL_LOAD_ADDRESS		0x100000

#define LINUX_FLAG_LOAD_HIGH			0x01
#define LINUX_FLAG_CAN_USE_HEAP			0x80

#define LINUX_MAX_INITRD_ADDRESS		0x38000000

typedef struct
{
	UCHAR		BootCode1[0x20];

	USHORT		CommandLineMagic;
	USHORT		CommandLineOffset;

	UCHAR		BootCode2[0x1CD];

	UCHAR		SetupSectors;
	USHORT		RootFlags;
	USHORT		SystemSize;
	USHORT		SwapDevice;
	USHORT		RamSize;
	USHORT		VideoMode;
	USHORT		RootDevice;
	USHORT		BootFlag;			// 0xAA55

} PACKED LINUX_BOOTSECTOR, *PLINUX_BOOTSECTOR;

typedef struct
{
	UCHAR		JumpInstruction[2];
	ULONG		SetupHeaderSignature;	// Signature for SETUP-header
	USHORT		Version;				// Version number of header format
	USHORT		RealModeSwitch;			// Default switch
	USHORT		SetupSeg;				// SETUPSEG
	USHORT		StartSystemSeg;
	USHORT		KernelVersion;			// Offset to kernel version string
	UCHAR		TypeOfLoader;			// Loader ID
									// =0, old one (LILO, Loadlin,
									//     Bootlin, SYSLX, bootsect...)
									// else it is set by the loader:
									// 0xTV: T=0 for LILO
									//       T=1 for Loadlin
									//       T=2 for bootsect-loader
									//       T=3 for SYSLX
									//       T=4 for ETHERBOOT
									//       V = version

	UCHAR		LoadFlags;				// flags, unused bits must be zero (RFU)
									// LOADED_HIGH = 1
									// bit within loadflags,
									// if set, then the kernel is loaded high
									// CAN_USE_HEAP = 0x80
									// if set, the loader also has set heap_end_ptr
									// to tell how much space behind setup.S
									// can be used for heap purposes.
									// Only the loader knows what is free!

	USHORT		SetupMoveSize;			// size to move, when we (setup) are not
									// loaded at 0x90000. We will move ourselves
									// to 0x90000 then just before jumping into
									// the kernel. However, only the loader
									// know how much of data behind us also needs
									// to be loaded.

	ULONG		Code32Start;			// here loaders can put a different
									// start address for 32-bit code.
									//
									//   0x1000 = default for zImage
									//
									// 0x100000 = default for big kernel

	ULONG		RamdiskAddress;			// address of loaded ramdisk image
									// Here the loader (or kernel generator) puts
									// the 32-bit address were it loaded the image.
	ULONG		RamdiskSize;			// its size in bytes

	USHORT		BootSectKludgeOffset;
	USHORT		BootSectKludgeSegment;
	USHORT		HeapEnd;				// space from here (exclusive) down to
									// end of setup code can be used by setup
									// for local heap purposes.
	USHORT		Pad1;
	ULONG		CommandLinePointer;		// 32-bit pointer to the kernel command line
	ULONG		InitrdAddressMax;		// Highest legal initrd address


} PACKED LINUX_SETUPSECTOR, *PLINUX_SETUPSECTOR;

VOID	BootNewLinuxKernel(VOID);				// Implemented in linux.S
VOID	BootOldLinuxKernel(ULONG KernelSize);		// Implemented in linux.S

VOID	LoadAndBootLinux(PCSTR OperatingSystemName, PCSTR Description);

BOOLEAN	LinuxParseIniSection(PCSTR OperatingSystemName);
BOOLEAN	LinuxReadBootSector(PFILE LinuxKernelFile);
BOOLEAN	LinuxReadSetupSector(PFILE LinuxKernelFile);
BOOLEAN	LinuxReadKernel(PFILE LinuxKernelFile);
BOOLEAN	LinuxCheckKernelVersion(VOID);
BOOLEAN	LinuxReadInitrd(PFILE LinuxInitrdFile);

#endif // defined __LINUX_H