io.h

著名操作系统Plan 9的第三版的部分核心源代码。现在很难找到了。Plan 9是bell实验室开发的Unix后继者。

/*
 *  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 */

#ifdef notdef
	Int0vec=	24,		/* first 8259 */
	 Clockvec=	Int0vec+0,	/*  clock interrupts */
	 Kbdvec=	Int0vec+1,	/*  keyboard interrupts */
	 Uart1vec=	Int0vec+3,	/*  modem line */
	 Uart0vec=	Int0vec+4,	/*  serial line */
	 PCMCIAvec=	Int0vec+5,	/*  PCMCIA card change */
	 Floppyvec=	Int0vec+6,	/*  floppy interrupts */
	 Parallelvec=	Int0vec+7,	/*  parallel port interrupts */
	Int1vec=	Int0vec+8,
	 Vector9=	Int0vec+9,	/*  unassigned */
	 Vector10=	Int0vec+10,	/*  unassigned, usually ethernet */
	 Vector11=	Int0vec+11,	/*  unassigned, usually scsi */
	 Mousevec=	Int0vec+12,	/*  mouse interrupt */
	 Matherr2vec=	Int0vec+13,	/*  math coprocessor */
	 ATAvec0=	Int0vec+14,	/*  ATA controller #1 */
	 ATAvec1=	Int0vec+15,	/*  ATA controller #2 */
#endif /* notdef */

	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,
	EISAconfig	= 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 */
};

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

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

	uchar	intl;			/* interrupt line */
	uchar	ccrp;
	uchar	ccru;
	uchar	ccrb;

	Pcidev*	list;
	Pcidev*	bridge;			/* down a bus */
	Pcidev*	link;			/* next device on this bno */
};

/*
 * PCMCIA support code.
 */
/*
 * 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;
};