/*
 *  <Insert copyright here : it must be BSD-like so everyone can use it>
 *
 *  Author:  Erich Boleyn  <erich@uruk.org>   http://www.uruk.org/~erich/
 *
 *  Header file implementing Intel MultiProcessor Specification (MPS)
 *  version 1.1 and 1.4 SMP hardware control for Intel Architecture CPUs,
 *  with hooks for running correctly on a standard PC without the hardware.
 *
 *  This file was created from information in the Intel MPS version 1.4
 *  document, order number 242016-004, which can be ordered from the
 *  Intel literature center.
 */

#ifndef _SMP_IMPS_H
#define _SMP_IMPS_H

/* make sure "apic.h" is included */
#ifndef _APIC_H
#error		Must include "apic.h" before "smp-imps.h"
#endif  /* !_APIC_H */

/*
 *  Defines used.
 */

#define IMPS_READ(x)	(*((volatile unsigned *) (x)))
#define IMPS_WRITE(x,y)	(*((volatile unsigned *) (x)) = (y))

#ifdef IMPS_DEBUG
#define IMPS_DEBUG_PRINT(x)  KERNEL_PRINT(x)
#else  /* !IMPS_DEBUG */
#define IMPS_DEBUG_PRINT(x)
#endif /* !IMPS_DEBUG */

#define IMPS_MAX_CPUS			APIC_BCAST_ID

/*
 *  This is the value that must be in the "sig" member of the MP
 *  Floating Pointer Structure.
 */
#define IMPS_FPS_SIGNATURE	('_' | ('M'<<8) | ('P'<<16) | ('_'<<24))
#define IMPS_FPS_IMCRP_BIT	0x80
#define IMPS_FPS_DEFAULT_MAX	7

/*
 *  This is the value that must be in the "sig" member of the MP
 *  Configuration Table Header.
 */
#define IMPS_CTH_SIGNATURE	('P' | ('C'<<8) | ('M'<<16) | ('P'<<24))

/*
 *  These are the "type" values for Base MP Configuration Table entries.
 */
#define		IMPS_FLAG_ENABLED	1
#define IMPS_BCT_PROCESSOR		0
#define		IMPS_CPUFLAG_BOOT	2
#define IMPS_BCT_BUS			1
#define IMPS_BCT_IOAPIC			2
#define IMPS_BCT_IO_INTERRUPT		3
#define IMPS_BCT_LOCAL_INTERRUPT	4
#define		IMPS_INT_INT		0
#define		IMPS_INT_NMI		1
#define		IMPS_INT_SMI		2
#define		IMPS_INT_EXTINT		3


/*
 *  Typedefs and data item definitions done here.
 */

typedef struct imps_fps imps_fps;	/* MP floating pointer structure */
typedef struct imps_cth imps_cth;	/* MP configuration table header */
typedef struct imps_processor imps_processor;
typedef struct imps_bus imps_bus;
typedef struct imps_ioapic imps_ioapic;
typedef struct imps_interrupt imps_interrupt;


/*
 *  Data structures defined here
 */

/*
 *  MP Floating Pointer Structure (fps)
 *
 *  Look at page 4-3 of the MP spec for the starting definitions of
 *  this structure.
 */
struct imps_fps
{
	unsigned sig;
	imps_cth *cth_ptr;
	unsigned char length;
	unsigned char spec_rev;
	unsigned char checksum;
	unsigned char feature_info[5];
};

/*
 *  MP Configuration Table Header  (cth)
 *
 *  Look at page 4-5 of the MP spec for the starting definitions of
 *  this structure.
 */
struct imps_cth
{
	unsigned sig;
	unsigned short base_length;
	unsigned char spec_rev;
	unsigned char checksum;
	char oem_id[8];
	char prod_id[12];
	unsigned oem_table_ptr;
	unsigned short oem_table_size;
	unsigned short entry_count;
	unsigned lapic_addr;
	unsigned short extended_length;
	unsigned char extended_checksum;
	char reserved[1];
};

/*
 *  Base MP Configuration Table Types.  They are sorted according to
 *  type (i.e. all of type 0 come first, etc.).  Look on page 4-6 for
 *  the start of the descriptions.
 */

struct imps_processor
{
	unsigned char type;			/* must be 0 */
	unsigned char apic_id;
	unsigned char apic_ver;
	unsigned char flags;
	unsigned signature;
	unsigned features;
	char reserved[8];
};

struct imps_bus
{
	unsigned char type;			/* must be 1 */
	unsigned char id;
	char bus_type[6];
};

struct imps_ioapic
{
	unsigned char type;			/* must be 2 */
	unsigned char id;
	unsigned char ver;
	unsigned char flags;
	unsigned addr;
};

struct imps_interrupt
{
	unsigned char type;			/* must be 3 or 4 */
	unsigned char int_type;
	unsigned short flags;
	unsigned char source_bus_id;
	unsigned char source_bus_irq;
	unsigned char dest_apic_id;
	unsigned char dest_apic_intin;
};


/*
 *  Exported globals here.
 */

/*
 *  "imps_enabled" is non-zero if the probe sequence found IMPS
 *  information and was successful.
 */
extern int imps_enabled;

/*
 *  This contains the local APIC hardware address.
 */
extern unsigned imps_lapic_addr;

/*
 *  This represents the number of CPUs found.
 */
extern int imps_num_cpus;

/*
 *  These map from virtual cpu numbers to APIC id's and back.
 */
extern unsigned char imps_cpu_apic_map[IMPS_MAX_CPUS];
extern unsigned char imps_apic_cpu_map[IMPS_MAX_CPUS];


/*
 *  This is the primary function for probing for Intel MPS 1.1/1.4
 *  compatible hardware and BIOS information.  While probing the CPUs
 *  information returned from the BIOS, this also starts up each CPU
 *  and gets it ready for use.
 *
 *  Call this during the early stages of OS startup, before memory can
 *  be messed up.
 *
 *  Returns N if IMPS information was found (for number of CPUs started)
 *  and is valid, else 0.
 */

int imps_probe(void);

/*
 *  This one is used as a "force" function.  Give it the number of CPUs
 *  to start, and it will assume a certain number and try it.
 */

int imps_force(int ncpus);


/*
 *  Defines that use variables
 */

#define IMPS_LAPIC_READ(x)  (*((volatile unsigned *) (imps_lapic_addr+(x))))
#define IMPS_LAPIC_WRITE(x, y)   \
   (*((volatile unsigned *) (imps_lapic_addr+(x))) = (y))

#endif  /* !_SMP_IMPS_H */