xv6/mp.h

/*
 * MultiProcessor Specification Version 1.[14].
 */
struct _MP_ {			/* floating pointer */
  uint8_t signature[4];		/* "_MP_" */
  physaddr_t physaddr;	        /* physical address of MP configuration table */
  uint8_t length;		/* 1 */
  uint8_t specrev;		/* [14] */
  uint8_t checksum;		/* all bytes must add up to 0 */
  uint8_t type;			/* MP system configuration type */
  uint8_t imcrp;
  uint8_t reserved[3];
};

struct PCMP {			/* configuration table header */
  uint8_t signature[4];		/* "PCMP" */
  uint16_t length;		/* total table length */
  uint8_t version;		/* [14] */
  uint8_t checksum;		/* all bytes must add up to 0 */
  uint8_t product[20];		/* product id */
  uintptr_t oemtable;		/* OEM table pointer */
  uint16_t oemlength;		/* OEM table length */
  uint16_t entry;		/* entry count */
  uintptr_t lapicbase;		/* address of local APIC */
  uint16_t xlength;		/* extended table length */
  uint8_t xchecksum;		/* extended table checksum */
  uint8_t reserved;
};

struct PCMPprocessor {		/* processor table entry */
  uint8_t type;			/* entry type (0) */
  uint8_t apicno;		/* local APIC id */
  uint8_t version;		/* local APIC verison */
  uint8_t flags;		/* CPU flags */
  uint8_t signature[4];		/* CPU signature */
  uint32_t feature;		/* feature flags from CPUID instruction */
  uint8_t reserved[8];
};

struct PCMPbus {		/* bus table entry */
  uint8_t type;			/* entry type (1) */
  uint8_t busno;		/* bus id */
  char string[6];		/* bus type string */
};

struct PCMPioapic {		/* I/O APIC table entry */
  uint8_t type;			/* entry type (2) */
  uint8_t apicno;		/* I/O APIC id */
  uint8_t version;		/* I/O APIC version */
  uint8_t flags;		/* I/O APIC flags */
  uintptr_t addr;		/* I/O APIC address */
};

struct PCMPintr {		/* interrupt table entry */
  uint8_t type;			/* entry type ([34]) */
  uint8_t intr;			/* interrupt type */
  uint16_t flags;		/* interrupt flag */
  uint8_t busno;		/* source bus id */
  uint8_t irq;			/* source bus irq */
  uint8_t apicno;		/* destination APIC id */
  uint8_t intin;		/* destination APIC [L]INTIN# */
};

struct PCMPsasm {		/* system address space mapping entry */
  uint8_t type;			/* entry type (128) */
  uint8_t length;		/* of this entry (20) */
  uint8_t busno;		/* bus id */
  uint8_t addrtype;
  uintptr_t addrbase[2];
  uint32_t addrlength[2];
};

struct PCMPhierarchy {		/* bus hierarchy descriptor entry */
  uint8_t type;			/* entry type (129) */
  uint8_t length;		/* of this entry (8) */
  uint8_t busno;		/* bus id */
  uint8_t info;			/* bus info */
  uint8_t parent;		/* parent bus */
  uint8_t reserved[3];
};

struct PCMPcbasm {		/* compatibility bus address space modifier entry */
  uint8_t type;			/* entry type (130) */
  uint8_t length;		/* of this entry (8) */
  uint8_t busno;		/* bus id */
  uint8_t modifier;		/* address modifier */
  uint32_t range;		/* predefined range list */
};

enum {				/* table entry types */
  PcmpPROCESSOR	= 0x00,		/* one entry per processor */
  PcmpBUS = 0x01,		/* one entry per bus */
  PcmpIOAPIC = 0x02,		/* one entry per I/O APIC */
  PcmpIOINTR = 0x03,		/* one entry per bus interrupt source */
  PcmpLINTR = 0x04,		/* one entry per system interrupt source */

  PcmpSASM = 0x80,
  PcmpHIERARCHY	= 0x81,
  PcmpCBASM = 0x82,

  /* PCMPprocessor and PCMPioapic flags */
  PcmpEN = 0x01,		/* enabled */
  PcmpBP = 0x02,		/* bootstrap processor */

				/* PCMPiointr and PCMPlintr flags */
  PcmpPOMASK = 0x03,		/* polarity conforms to specifications of bus */
  PcmpHIGH = 0x01,		/* active high */
  PcmpLOW = 0x03,		/* active low */
  PcmpELMASK = 0x0C,		/* trigger mode of APIC input signals */
  PcmpEDGE = 0x04,		/* edge-triggered */
  PcmpLEVEL = 0x0C,		/* level-triggered */

  /* PCMPiointr and PCMPlintr interrupt type */
  PcmpINT = 0x00,		/* vectored interrupt from APIC Rdt */
  PcmpNMI = 0x01,		/* non-maskable interrupt */
  PcmpSMI = 0x02,		/* system management interrupt */
  PcmpExtINT = 0x03,		/* vectored interrupt from external PIC */

  /* PCMPsasm addrtype */
  PcmpIOADDR = 0x00,		/* I/O address */
  PcmpMADDR = 0x01,		/* memory address */
  PcmpPADDR = 0x02,		/* prefetch address */

  /* PCMPhierarchy info */
  PcmpSD = 0x01,		/* subtractive decode bus */

				/* PCMPcbasm modifier */
  PcmpPR = 0x01,		/* predefined range list */
};

/*
 * Common bits for
 *	I/O APIC Redirection Table Entry;
 *	Local APIC Local Interrupt Vector Table;
 *	Local APIC Inter-Processor Interrupt;
 *	Local APIC Timer Vector Table.
 */
enum {
  ApicFIXED = 0x00000000,	/* [10:8] Delivery Mode */
  ApicLOWEST = 0x00000100,	/* Lowest priority */
  ApicSMI = 0x00000200,	        /* System Management Interrupt */
  ApicRR = 0x00000300,	        /* Remote Read */
  ApicNMI = 0x00000400,
  ApicINIT = 0x00000500,	/* INIT/RESET */
  ApicSTARTUP = 0x00000600,	/* Startup IPI */
  ApicExtINT = 0x00000700,

  ApicPHYSICAL = 0x00000000,	/* [11] Destination Mode (RW) */
  ApicLOGICAL = 0x00000800,

  ApicDELIVS = 0x00001000,	/* [12] Delivery Status (RO) */
  ApicHIGH = 0x00000000,	/* [13] Interrupt Input Pin Polarity (RW) */
  ApicLOW = 0x00002000,
  ApicRemoteIRR	= 0x00004000,	/* [14] Remote IRR (RO) */
  ApicEDGE = 0x00000000,	/* [15] Trigger Mode (RW) */
  ApicLEVEL = 0x00008000,
  ApicIMASK = 0x00010000,	/* [16] Interrupt Mask */
};