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/*
* Mach Operating System
* Copyright (c) 1994-1989 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
* File: busses.h
* Author: Alessandro Forin, Carnegie Mellon University
* Date: 4/90
*
* Structures used by configuration routines to
* explore a given bus structure.
*/
#ifndef _CHIPS_BUSSES_H_
#define _CHIPS_BUSSES_H_
#include <mach/boolean.h>
#include <mach/machine/vm_types.h>
/*
*
* This is mildly modeled after the Unibus on Vaxen,
* one of the most complicated bus structures.
* Therefore, let's hope this can be done once and for all.
*
* At the bottom level there is a "bus_device", which
* might exist in isolation (e.g. a clock on the CPU
* board) or be a standard component of an architecture
* (e.g. the bitmap display on some workstations).
*
* Disk devices and communication lines support multiple
* units, hence the "bus_driver" structure which is more
* flexible and allows probing and dynamic configuration
* of the number and type of attached devices.
*
* At the top level there is a "bus_ctlr" structure, used
* in systems where the I/O bus(ses) are separate from
* the memory bus(ses), and/or when memory boards can be
* added to the main bus (and they must be config-ed
* and/or can interrupt the processor for ECC errors).
*
* The autoconfiguration process typically starts at
* the top level and walks down tables that are
* defined either in a generic file or are specially
* created by config.
*/
/*
* Per-controller structure.
*/
struct bus_ctlr {
struct bus_driver *driver; /* myself, as a device */
char *name; /* readability */
int unit; /* index in driver */
int (*intr)(); /* interrupt handler(s) */
vm_offset_t address; /* device virtual address */
int am; /* address modifier */
vm_offset_t phys_address;/* device phys address */
char adaptor; /* slot where found */
char alive; /* probed successfully */
char flags; /* any special conditions */
vm_offset_t sysdep; /* On some systems, queue of
* operations in-progress */
natural_t sysdep1; /* System dependent */
};
/*
* Per-``device'' structure
*/
struct bus_device {
struct bus_driver *driver; /* autoconf info */
char *name; /* my name */
int unit;
int (*intr)();
vm_offset_t address; /* device address */
int am; /* address modifier */
vm_offset_t phys_address;/* device phys address */
char adaptor;
char alive;
char ctlr;
char slave;
int flags;
struct bus_ctlr *mi; /* backpointer to controller */
struct bus_device *next; /* optional chaining */
vm_offset_t sysdep; /* System dependent */
natural_t sysdep1; /* System dependent */
};
/*
* General flag definitions
*/
#define BUS_INTR_B4_PROBE 0x01 /* enable interrupts before probe */
#define BUS_INTR_DISABLED 0x02 /* ignore all interrupts */
#define BUS_CTLR 0x04 /* descriptor for a bus adaptor */
#define BUS_XCLU 0x80 /* want exclusive use of bdp's */
/*
* Per-driver structure.
*
* Each bus driver defines entries for a set of routines
* that are used at boot time by the configuration program.
*/
struct bus_driver {
int (*probe)( /* see if the driver is there */
/* vm_offset_t address,
struct bus_ctlr * */ );
int (*slave)( /* see if any slave is there */
/* struct bus_device *,
vm_offset_t */ );
void (*attach)( /* setup driver after probe */
/* struct bus_device * */);
int (*dgo)(); /* start transfer */
vm_offset_t *addr; /* device csr addresses */
char *dname; /* name of a device */
struct bus_device **dinfo; /* backpointers to init structs */
char *mname; /* name of a controller */
struct bus_ctlr **minfo; /* backpointers to init structs */
int flags;
};
#ifdef KERNEL
extern struct bus_ctlr bus_master_init[];
extern struct bus_device bus_device_init[];
extern boolean_t configure_bus_master(char *, vm_offset_t, vm_offset_t,
int, char * );
extern boolean_t configure_bus_device(char *, vm_offset_t, vm_offset_t,
int, char * );
#endif /* KERNEL */
#endif /* _CHIPS_BUSSES_H_ */
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