io.h

这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

/*
 *  programmable interrupt vectors (for the 8259's)
 */
enum
{
	Bptvec=		3,		/* breakpoints */
	Mathemuvec=	7,		/* math coprocessor emulation interrupt */
	Mathovervec=	9,		/* math coprocessor overrun interrupt */
	Matherr1vec=	16,		/* math coprocessor error interrupt */
	Faultvec=	14,		/* page fault */

	Syscallvec=	64,

	VectorPIC	= 24,		/* external [A]PIC interrupts */
	VectorCLOCK	= VectorPIC+0,
	VectorKBD	= VectorPIC+1,
	VectorUART1	= VectorPIC+3,
	VectorUART0	= VectorPIC+4,
	VectorPCMCIA	= VectorPIC+5,
	VectorFLOPPY	= VectorPIC+6,
	VectorLPT	= VectorPIC+7,
	VectorIRQ7	= VectorPIC+7,
	VectorAUX	= VectorPIC+12,	/* PS/2 port */
	VectorIRQ13	= VectorPIC+13,	/* coprocessor on x386 */
	VectorATA0	= VectorPIC+14,
	VectorATA1	= VectorPIC+15,
	MaxVectorPIC	= VectorPIC+15,
};

enum {
	BusCBUS		= 0,		/* Corollary CBUS */
	BusCBUSII,			/* Corollary CBUS II */
	BusEISA,			/* Extended ISA */
	BusFUTURE,			/* IEEE Futurebus */
	BusINTERN,			/* Internal bus */
	BusISA,				/* Industry Standard Architecture */
	BusMBI,				/* Multibus I */
	BusMBII,			/* Multibus II */
	BusMCA,				/* Micro Channel Architecture */
	BusMPI,				/* MPI */
	BusMPSA,			/* MPSA */
	BusNUBUS,			/* Apple Macintosh NuBus */
	BusPCI,				/* Peripheral Component Interconnect */
	BusPCMCIA,			/* PC Memory Card International Association */
	BusTC,				/* DEC TurboChannel */
	BusVL,				/* VESA Local bus */
	BusVME,				/* VMEbus */
	BusXPRESS,			/* Express System Bus */
};

#define MKBUS(t,b,d,f)	(((t)<<24)|(((b)&0xFF)<<16)|(((d)&0x1F)<<11)|(((f)&0x07)<<8))
#define BUSFNO(tbdf)	(((tbdf)>>8)&0x07)
#define BUSDNO(tbdf)	(((tbdf)>>11)&0x1F)
#define BUSBNO(tbdf)	(((tbdf)>>16)&0xFF)
#define BUSTYPE(tbdf)	((tbdf)>>24)
#define BUSBDF(tbdf)	((tbdf)&0x00FFFF00)
#define BUSUNKNOWN	(-1)

enum {
	MaxEISA		= 16,
	CfgEISA		= 0xC80,
};

/*
 * PCI support code.
 */
enum {					/* type 0 and type 1 pre-defined header */
	PciVID		= 0x00,		/* vendor ID */
	PciDID		= 0x02,		/* device ID */
	PciPCR		= 0x04,		/* command */
	PciPSR		= 0x06,		/* status */
	PciRID		= 0x08,		/* revision ID */
	PciCCRp		= 0x09,		/* programming interface class code */
	PciCCRu		= 0x0A,		/* sub-class code */
	PciCCRb		= 0x0B,		/* base class code */
	PciCLS		= 0x0C,		/* cache line size */
	PciLTR		= 0x0D,		/* latency timer */
	PciHDT		= 0x0E,		/* header type */
	PciBST		= 0x0F,		/* BIST */

	PciBAR0		= 0x10,		/* base address */
	PciBAR1		= 0x14,

	PciINTL		= 0x3C,		/* interrupt line */
	PciINTP		= 0x3D,		/* interrupt pin */
};

enum {					/* type 0 pre-defined header */
	PciBAR2		= 0x18,
	PciBAR3		= 0x1C,
	PciBAR4		= 0x20,
	PciBAR5		= 0x24,
	PciCIS		= 0x28,		/* cardbus CIS pointer */
	PciSVID		= 0x2C,		/* subsystem vendor ID */
	PciSID		= 0x2E,		/* cardbus CIS pointer */
	PciEBAR0	= 0x30,		/* expansion ROM base address */
	PciMGNT		= 0x3E,		/* burst period length */
	PciMLT		= 0x3F,		/* maximum latency between bursts */
};

enum {					/* type 1 pre-defined header */
	PciPBN		= 0x18,		/* primary bus number */
	PciSBN		= 0x19,		/* secondary bus number */
	PciUBN		= 0x1A,		/* subordinate bus number */
	PciSLTR		= 0x1B,		/* secondary latency timer */
	PciIBR		= 0x1C,		/* I/O base */
	PciILR		= 0x1D,		/* I/O limit */
	PciSPSR		= 0x1E,		/* secondary status */
	PciMBR		= 0x20,		/* memory base */
	PciMLR		= 0x22,		/* memory limit */
	PciPMBR		= 0x24,		/* prefetchable memory base */
	PciPMLR		= 0x26,		/* prefetchable memory limit */
	PciPUBR		= 0x28,		/* prefetchable base upper 32 bits */
	PciPULR		= 0x2C,		/* prefetchable limit upper 32 bits */
	PciIUBR		= 0x30,		/* I/O base upper 16 bits */
	PciIULR		= 0x32,		/* I/O limit upper 16 bits */
	PciEBAR1	= 0x28,		/* expansion ROM base address */
	PciBCR		= 0x3E,		/* bridge control register */
};

enum {					/* type 2 pre-defined header */
	PciCBExCA	= 0x10,
	PciCBSPSR	= 0x16,
	PciCBPBN	= 0x18,		/* primary bus number */
	PciCBSBN	= 0x19,		/* secondary bus number */
	PciCBUBN	= 0x1A,		/* subordinate bus number */
	PciCBSLTR	= 0x1B,		/* secondary latency timer */
	PciCBMBR0	= 0x1C,
	PciCBMLR0	= 0x20,
	PciCBMBR1	= 0x24,
	PciCBMLR1	= 0x28,
	PciCBIBR0	= 0x2C,		/* I/O base */
	PciCBILR0	= 0x30,		/* I/O limit */
	PciCBIBR1	= 0x34,		/* I/O base */
	PciCBILR1	= 0x38,		/* I/O limit */
	PciCBBCTL	= 0x3E,		/* Bridge control */
	PciCBSVID	= 0x40,		/* subsystem vendor ID */
	PciCBSID	= 0x42,		/* subsystem ID */
	PciCBLMBAR	= 0x44,		/* legacy mode base address */
};

typedef struct Pcisiz Pcisiz;
struct Pcisiz
{
	Pcidev*	dev;
	int	siz;
	int	bar;
};

typedef struct Pcidev Pcidev;
typedef struct Pcidev {
	int	tbdf;			/* type+bus+device+function */
	ushort	vid;			/* vendor ID */
	ushort	did;			/* device ID */

	ushort	pcr;

	uchar	rid;
	uchar	ccrp;
	uchar	ccru;
	uchar	ccrb;
	uchar	cls;
	uchar	ltr;

	struct {
		ulong	bar;		/* base address */
		int	size;
	} mem[6];

	struct {
		ulong	bar;
		int	size;
	} rom;
	uchar	intl;			/* interrupt line */

	Pcidev*	list;
	Pcidev*	link;			/* next device on this bno */

	Pcidev*	bridge;			/* down a bus */
	struct {
		ulong	bar;
		int	size;
	} ioa, mema;

	int	pmrb;			/* power management register block */
};

#define PCIWINDOW	0
#define PCIWADDR(va)	(PADDR(va)+PCIWINDOW)
#define ISAWINDOW	0
#define ISAWADDR(va)	(PADDR(va)+ISAWINDOW)

/*
 * PCMCIA support code.
 */
typedef struct PCMslot		PCMslot;
typedef struct PCMconftab	PCMconftab;

/*
 * Map between ISA memory space and PCMCIA card memory space.
 */
struct PCMmap {
	ulong	ca;			/* card address */
	ulong	cea;			/* card end address */
	ulong	isa;			/* ISA address */
	int	len;			/* length of the ISA area */
	int	attr;			/* attribute memory */
	int	ref;
};

/* configuration table entry */
struct PCMconftab
{
	int	index;
	ushort	irqs;		/* legal irqs */
	uchar	irqtype;
	uchar	bit16;		/* true for 16 bit access */
	struct {
		ulong	start;
		ulong	len;
	} io[16];
	int	nio;
	uchar	vpp1;
	uchar	vpp2;
	uchar	memwait;
	ulong	maxwait;
	ulong	readywait;
	ulong	otherwait;
};

/* a card slot */
struct PCMslot
{
	Lock;
	int	ref;

	void	*cp;		/* controller for this slot */
	long	memlen;		/* memory length */
	uchar	base;		/* index register base */
	uchar	slotno;		/* slot number */

	/* status */
	uchar	special;	/* in use for a special device */
	uchar	already;	/* already inited */
	uchar	occupied;
	uchar	battery;
	uchar	wrprot;
	uchar	powered;
	uchar	configed;
	uchar	enabled;
	uchar	busy;

	/* cis info */
	ulong	msec;		/* time of last slotinfo call */
	char	verstr[512];	/* version string */
	int	ncfg;		/* number of configurations */
	struct {
		ushort	cpresent;	/* config registers present */
		ulong	caddr;		/* relative address of config registers */
	} cfg[8];
	int	nctab;		/* number of config table entries */
	PCMconftab	ctab[8];
	PCMconftab	*def;	/* default conftab */

	/* memory maps */
	Lock	mlock;		/* lock down the maps */
	int	time;
	PCMmap	mmap[4];	/* maps, last is always for the kernel */
};