typedef struct Conf	Conf;typedef struct Confmem	Confmem;typedef struct FPsave	FPsave;typedef struct ISAConf	ISAConf;typedef struct Label	Label;typedef struct Lock	Lock;typedef struct Mach	Mach;typedef struct Notsave	Notsave;typedef struct Page	Page;typedef struct PCArch	PCArch;typedef struct PCB	PCB;typedef struct Pcidev	Pcidev;typedef struct PMMU	PMMU;typedef struct Proc	Proc;typedef struct Sys	Sys;typedef struct Ureg	Ureg;typedef struct Vctl	Vctl;typedef vlong		Tval; #define MAXSYSARG	6	/* for mount(fd, mpt, flag, arg, srv) */ /* *  parameters for sysproc.c */#define AOUT_MAGIC	L_MAGIC /* *  machine dependent definitions used by ../port/dat.h */ struct Lock{	ulong	key;			/* semaphore (non-zero = locked) */	ulong	sr;	ulong	pc;	Proc	*p;	Mach	*m;	ulong	pid;	ushort	isilock;}; struct Label{	ulong	sp;	ulong	pc;}; /* * Proc.fpstate */enum{	/* floating point states */	FPinit,	FPactive,	FPinactive, 	/* bit or'd with the state */	FPillegal= 0x100,}; struct	FPsave{	long	fpreg[2*32];	long	dummy;		/* lower bits of FPCR, useless */	long	fpstatus;}; struct Confmem{	ulong	base;	ulong	npage;	ulong	kbase;	ulong	klimit;}; struct Conf{	ulong	nmach;		/* processors */	ulong	nproc;		/* processes */	Confmem	mem[2];	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 */	int	nswppo;		/* max # of pageouts per segment pass */	ulong	copymode;	/* 0 is copy on write, 1 is copy on reference */	int	monitor;		/* has display? */	ulong	ialloc;		/* bytes available for interrupt time allocation */	ulong	pipeqsize;	/* size in bytes of pipe queues */}; /* *  mmu goo in the Proc structure */struct PMMU{	Page	*mmutop;	/* 1st level table */	Page	*mmulvl2;	/* 2nd level table */	Page	*mmufree;	/* unused page table pages */	Page	*mmuused;	/* used page table pages, except for mmustk */}; /* *  things saved in the Proc structure during a notify */struct Notsave{	ulong	UNUSED;}; #include "../port/portdat.h" /* *  machine dependent definitions not used by ../port/dat.h *//* * Fake kmap */typedef	void		KMap;#define	VA(k)		((ulong)(k))#define	kmap(p)		(KMap*)((p)->pa|KZERO)#define	kunmap(k) /* *	Process Control Block, used by PALcode */struct PCB {	uvlong	ksp;	uvlong	usp;	uvlong	ptbr;	ulong	asn;	ulong	pcc;	uvlong	unique;	ulong	fen;	ulong	dummy;	uvlong	rsrv1;	uvlong	rsrv2;}; struct Mach{	/* OFFSETS OF THE FOLLOWING KNOWN BY l.s */	int	machno;			/* physical id of processor */	ulong	splpc;			/* pc that called splhi() */	Proc	*proc;			/* current process on this processor */ 	/* ordering from here on irrelevant */ 	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	inclockintr; 	Proc*	readied;		/* for runproc */	ulong	schedticks;	/* next forced context switch */ 	vlong	cpuhz;			/* hwrpb->cfreq */	uvlong	cyclefreq;		/* Frequency of user readable cycle counter */	ulong	pcclast;	uvlong	fastclock;	Perf	perf;			/* performance counters */ 	int	tlbfault;		/* only used by devproc; no access to tlb */	int	tlbpurge;		/* ... */	int	pfault;	int	cs;	int	syscall;	int	load;	int	intr;	int	flushmmu;		/* make current proc flush it's mmu state */	int	ilockdepth; 	ulong	spuriousintr;	int	lastintr; 	PCB; 	/* MUST BE LAST */	int	stack[1];}; struct{	Lock;	short	machs;	short	exiting;	short	ispanic;}active; /* *	Implementation-dependant functions (outside of Alpha architecture proper). *	Called PCArch because that's what mkdevc calls it (for the PC). */struct PCArch{	char*	id;	int	(*ident)(void); 	void	(*coreinit)(void);		/* set up core logic, PCI mappings etc */	void	(*corehello)(void);		/* identify core logic to user */	void	(*coredetach)(void);		/* restore core logic before return to console */	void	*(*pcicfg)(int, int);		/* map and point to PCI cfg space */	void	*(*pcimem)(int, int);		/* map and point to PCI memory space */	int	(*intrenable)(Vctl*);	int	(*intrvecno)(int);	int	(*intrdisable)(int); 	int	(*_inb)(int);	ushort	(*_ins)(int);	ulong	(*_inl)(int);	void	(*_outb)(int, int);	void	(*_outs)(int, ushort);	void	(*_outl)(int, ulong);	void	(*_insb)(int, void*, int);	void	(*_inss)(int, void*, int);	void	(*_insl)(int, void*, int);	void	(*_outsb)(int, void*, int);	void	(*_outss)(int, void*, int);	void	(*_outsl)(int, void*, int);}; /* *  a parsed plan9.ini line */#define NISAOPT		8 struct ISAConf {	char	*type;	ulong	port;	int	irq;	ulong	dma;	ulong	mem;	ulong	size;	ulong	freq; 	int	nopt;	char	*opt[NISAOPT];}; extern PCArch	*arch; #define	MACHP(n)	((Mach *)((int)&mach0+n*BY2PG))extern Mach		mach0; extern register Mach	*m;extern register Proc	*up; /* *  hardware info about a device */typedef struct {	ulong	port;		int	size;} Devport; struct DevConf{	ulong	intnum;	/* interrupt number */	char	*type;	/* card type, malloced */	int	nports;	/* Number of ports */	Devport	*ports;	/* The ports themselves */}; extern FPsave initfp;