xv6/mp.h

/*
 * MultiProcessor Specification Version 1.[14].
 *
 * Credit: Plan 9 sources
 */

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 MPCTB {			/* 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 lapicaddr;		/* address of local APIC */
  uint16_t xlength;		/* extended table length */
  uint8_t xchecksum;		/* extended table checksum */
  uint8_t reserved;
};

struct MPPE {		/* processor table entry */
  uint8_t type;			/* entry type (0) */
  uint8_t apicid;		/* 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 MPBE {		/* bus table entry */
  uint8_t type;			/* entry type (1) */
  uint8_t busno;		/* bus id */
  char string[6];		/* bus type string */
};

struct MPIOAPIC {	/* 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 MPIE {		/* 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# */
};

enum {			/* table entry types */
  MPPROCESSOR	= 0x00,		/* one entry per processor */
  MPBUS = 0x01,		        /* one entry per bus */
  MPIOAPIC = 0x02,		/* one entry per I/O APIC */
  MPIOINTR = 0x03,		/* one entry per bus interrupt source */
  MPLINTR = 0x04,		/* one entry per system interrupt source */

  MPSASM = 0x80,
  MPHIERARCHY	= 0x81,
  MPCBASM = 0x82,

                        /* PCMPprocessor and PCMPioapic flags */
  MPEN = 0x01,		        /* enabled */
  MPBP = 0x02,		        /* bootstrap processor */

			/* PCMPiointr and PCMPlintr flags */
  MPPOMASK = 0x03,		/* polarity conforms to specifications of bus */
  MPHIGH = 0x01,		/* active high */
  MPLOW = 0x03,		/* active low */
  MPELMASK = 0x0C,		/* trigger mode of APIC input signals */
  MPEDGE = 0x04,		/* edge-triggered */
  MPLEVEL = 0x0C,		/* level-triggered */

                        /* PCMPiointr and PCMPlintr interrupt type */
  MPINT = 0x00,		        /* vectored interrupt from APIC Rdt */
  MPNMI = 0x01,		        /* non-maskable interrupt */
  MPSMI = 0x02,		        /* system management interrupt */
  MPExtINT = 0x03,		/* vectored interrupt from external PIC */
};

/*
 * 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 {
  APIC_FIXED = 0x00000000,	/* [10:8] Delivery Mode */
  APIC_LOWEST = 0x00000100,	/* Lowest priority */
  APIC_SMI = 0x00000200,	        /* System Management Interrupt */
  APIC_RR = 0x00000300,	        /* Remote Read */
  APIC_NMI = 0x00000400,
  APIC_INIT = 0x00000500,	/* INIT/RESET */
  APIC_STARTUP = 0x00000600,	/* Startup IPI */
  APIC_ExtINT = 0x00000700,

  APIC_PHYSICAL = 0x00000000,	/* [11] Destination Mode (RW) */
  APIC_LOGICAL = 0x00000800,

  APIC_DELIVS = 0x00001000,	/* [12] Delivery Status (RO) */
  APIC_HIGH = 0x00000000,	/* [13] Interrupt Input Pin Polarity (RW) */
  APIC_LOW = 0x00002000,
  APIC_RemoteIRR	= 0x00004000,	/* [14] Remote IRR (RO) */
  APIC_EDGE = 0x00000000,	/* [15] Trigger Mode (RW) */
  APIC_LEVEL = 0x00008000,
  APIC_IMASK = 0x00010000,	/* [16] Interrupt Mask */
};