typedef struct Conf	Conf;
typedef struct FPsave	FPsave;
typedef struct Irq	Irq;
typedef struct Irqctl	Irqctl;
typedef struct ISAConf	ISAConf;
typedef struct Label	Label;
typedef struct Lock	Lock;
typedef struct MMU	MMU;
typedef struct Mach	Mach;
typedef struct Notsave	Notsave;
typedef struct PCArch	PCArch;
typedef struct Pcidev	Pcidev;
typedef struct PCMmap	PCMmap;
typedef struct Page	Page;
typedef struct PMMU	PMMU;
typedef struct Segdesc	Segdesc;
typedef struct Ureg	Ureg;

/*
 *  parameters for sysproc.c
 */
#define AOUT_MAGIC	(I_MAGIC)

struct Lock
{
	ulong	key;
	ulong	sr;
	ulong	pc;
	ulong	pid;
};

struct Label
{
	ulong	sp;
	ulong	pc;
};


/*
 * FPsave.status
 */
enum
{
	FPinit,
	FPactive,
	FPinactive,
};

struct	FPsave
{
	ushort	control;
	ushort	r1;
	ushort	status;
	ushort	r2;
	ushort	tag;
	ushort	r3;
	ulong	pc;
	ushort	selector;
	ushort	r4;
	ulong	operand;
	ushort	oselector;
	ushort	r5;
	uchar	regs[80];	/* floating point registers */
};

struct Conf
{
	ulong	nmach;		/* processors */
	ulong	nproc;		/* processes */
	ulong	monitor;	/* has monitor? */
	ulong	npage0;		/* total physical pages of memory */
	ulong	npage1;		/* total physical pages of memory */
	ulong	npage;		/* total physical pages of memory */
	ulong	upages;		/* user page pool */
	ulong	nimage;		/* number of page cache image headers */
	ulong	nswap;		/* number of swap pages */
	ulong	base0;		/* base of bank 0 */
	ulong	base1;		/* base of bank 1 */
	ulong	copymode;	/* 0 is copy on write, 1 is copy on reference */
	ulong	ialloc;		/* max interrupt time allocation in bytes */
	ulong	pipeqsize;	/* size in bytes of pipe queues */
};

/*
 *  MMU stuff in proc
 */
#define NCOLOR 1
struct PMMU
{
	Page*	mmupdb;			/* page directory base */
	Page*	mmufree;		/* unused page table pages */
	Page*	mmuused;		/* used page table pages */
};

/*
 *  things saved in the Proc structure during a notify
 */
struct Notsave
{
	ulong	svflags;
	ulong	svcs;
	ulong	svss;
};

#include "../port/portdat.h"

typedef struct {
	ulong	link;			/* link (old TSS selector) */
	ulong	esp0;			/* privilege level 0 stack pointer */
	ulong	ss0;			/* privilege level 0 stack selector */
	ulong	esp1;			/* privilege level 1 stack pointer */
	ulong	ss1;			/* privilege level 1 stack selector */
	ulong	esp2;			/* privilege level 2 stack pointer */
	ulong	ss2;			/* privilege level 2 stack selector */
	ulong	cr3;			/* page directory base register */
	ulong	eip;			/* instruction pointer */
	ulong	eflags;			/* flags register */
	ulong	eax;			/* general registers */
	ulong 	ecx;
	ulong	edx;
	ulong	ebx;
	ulong	esp;
	ulong	ebp;
	ulong	esi;
	ulong	edi;
	ulong	es;			/* segment selectors */
	ulong	cs;
	ulong	ss;
	ulong	ds;
	ulong	fs;
	ulong	gs;
	ulong	ldt;			/* selector for task's LDT */
	ulong	iomap;			/* I/O map base address + T-bit */
} Tss;

struct Segdesc
{
	ulong	d0;
	ulong	d1;
};

struct Mach
{
	int	machno;			/* physical id of processor */
	ulong	splpc;			/* pc of last caller to splhi */

	ulong*	pdb;			/* page directory base for this processor (va) */
	Tss*	tss;			/* tss for this processor */
	Segdesc	gdt[6];			/* gdt for this processor */

	Proc*	proc;			/* current process on this processor */
	Proc*	externup;		/* extern register Proc *up */

	Page*	pdbpool;
	int	pdbcnt;

	ulong	ticks;			/* of the clock since boot time */
	Label	sched;			/* scheduler wakeup */
	Lock	alarmlock;		/* access to alarm list */
	void*	alarm;			/* alarms bound to this clock */

	int	tlbfault;
	int	tlbpurge;
	int	pfault;
	int	cs;
	int	syscall;
	int	load;
	int	intr;

	ulong	spuriousintr;
	ulong	lastintr;

	int	loopconst;

	int	cpumhz;
	int	cpuidax;
	int	cpuiddx;
	char	cpuidid[16];
	char*	cpuidtype;

	int	stack[1];
};

/*
 * Fake kmap
 */
typedef void		KMap;
#define	VA(k)		((ulong)(k))
#define	kmap(p)		(KMap*)((p)->pa|KZERO)
#define	kunmap(k)

struct
{
	Lock;
	int	machs;			/* bitmap of active CPUs */
	int	exiting;		/* shutdown */
	int	ispanic;		/* shutdown in response to a panic */
}active;

/*
 *  routines for things outside the PC model, like power management
 */
struct PCArch
{
	char*	id;
	int	(*ident)(void);		/* this should be in the model */
	void	(*reset)(void);		/* this should be in the model */
	int	(*serialpower)(int);	/* 1 == on, 0 == off */
	int	(*modempower)(int);	/* 1 == on, 0 == off */

	void	(*intrinit)(void);
	int	(*intrenable)(int, int, Irqctl*);

	void	(*clockenable)(void);
};

/*
 *  a parsed plan9.ini line
 */
#define ISAOPTLEN	16
#define NISAOPT		8

struct ISAConf {
	char	type[NAMELEN];
	ulong	port;
	ulong	irq;
	ulong	dma;
	ulong	mem;
	ulong	size;
	ulong	freq;

	int	nopt;
	char	opt[NISAOPT][ISAOPTLEN];
};

extern PCArch	*arch;			/* PC architecture */

/*
 * Each processor sees its own Mach structure at address MACHADDR.
 * However, the Mach structures must also be available via the per-processor
 * MMU information array machp, mainly for disambiguation and access to
 * the clock which is only maintained by the bootstrap processor (0).
 */
Mach* machp[MAXMACH];
	
#define	MACHP(n)	(machp[n])

extern Mach	*m;
#define up	(((Mach*)MACHADDR)->externup)

/*
 *  SCSI bus
 */
enum {
	MaxScsi		= 4,
	NTarget		= 8,
};
struct Target {
	int	ctlrno;
	int	target;
	uchar*	inq;
	uchar*	scratch;

	Rendez	rendez;

	int	ok;
};
typedef int 	(*Scsiio)(Target*, int, uchar*, int, void*, int*);

typedef struct Irq {
	void	(*f)(Ureg*, void*);	/* handler to call */
	void*	a;			/* argument to call it with */

	Irq*	next;			/* link to next handler */
} Irq;

typedef struct Irqctl {
	int	(*isr)(int);		/* get isr bit for this irq */
	int	(*eoi)(int);		/* eoi */
	int	isintr;

	Irq*	irq;			/* handlers on this IRQ */
} Irqctl;