launch.h

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/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1992 - 1997, 2000 Silicon Graphics, Inc.
 * Copyright (C) 2000 by Colin Ngam
 */
#ifndef _ASM_SN_LAUNCH_H
#define _ASM_SN_LAUNCH_H

#include <asm/sn/types.h>
#include <asm/sn/addrs.h>

/*
 * The launch data structure resides at a fixed place in each node's memory
 * and is used to communicate between the master processor and the slave
 * processors.
 *
 * The master stores launch parameters in the launch structure
 * corresponding to a target processor that is in a slave loop, then sends
 * an interrupt to the slave processor.  The slave calls the desired
 * function, then returns to the slave loop.  The master may poll or wait
 * for the slaves to finish.
 *
 * There is an array of launch structures, one per CPU on the node.  One
 * interrupt level is used per local CPU.
 */

#define LAUNCH_MAGIC        0xaddbead2addbead3
#ifdef CONFIG_SGI_IP27
#define LAUNCH_SIZEOF       0x100
#define LAUNCH_PADSZ        0xa0
#endif

#define LAUNCH_OFF_MAGIC    0x00    /* Struct offsets for assembly      */
#define LAUNCH_OFF_BUSY     0x08
#define LAUNCH_OFF_CALL     0x10
#define LAUNCH_OFF_CALLC    0x18
#define LAUNCH_OFF_CALLPARM 0x20
#define LAUNCH_OFF_STACK    0x28
#define LAUNCH_OFF_GP       0x30
#define LAUNCH_OFF_BEVUTLB  0x38
#define LAUNCH_OFF_BEVNORMAL    0x40
#define LAUNCH_OFF_BEVECC   0x48

#define LAUNCH_STATE_DONE   0   /* Return value of LAUNCH_POLL      */
#define LAUNCH_STATE_SENT   1
#define LAUNCH_STATE_RECD   2

/*
 * The launch routine is called only if the complement address is correct.
 *
 * Before control is transferred to a routine, the complement address
 * is zeroed (invalidated) to prevent an accidental call from a spurious
 * interrupt.
 *
 * The slave_launch routine turns on the BUSY flag, and the slave loop
 * clears the BUSY flag after control is returned to it.
 */

#ifndef __ASSEMBLY__

typedef int launch_state_t;
typedef void (*launch_proc_t)(u64 call_parm);

typedef struct launch_s {
    volatile u64        magic;  /* Magic number                     */
    volatile u64        busy;   /* Slave currently active           */
    volatile launch_proc_t  call_addr;  /* Func. for slave to call  */
    volatile u64        call_addr_c;    /* 1's complement of call_addr*/
    volatile u64        call_parm;  /* Single parm passed to call*/
    volatile void *stack_addr;  /* Stack pointer for slave function */
    volatile void *gp_addr;     /* Global pointer for slave func.   */
    volatile char       *bevutlb;/* Address of bev utlb ex handler   */
    volatile char       *bevnormal;/*Address of bev normal ex handler */
    volatile char       *bevecc;/* Address of bev cache err handler */
    volatile char       pad[160];   /* Pad to LAUNCH_SIZEOF     */
} launch_t;

/*
 * PROM entry points for launch routines are determined by IPxxprom/start.s
 */

#define LAUNCH_SLAVE    (*(void (*)(int nasid, int cpu, \
                    launch_proc_t call_addr, \
                    u64 call_parm, \
                    void *stack_addr, \
                    void *gp_addr)) \
             IP27PROM_LAUNCHSLAVE)

#define LAUNCH_WAIT (*(void (*)(int nasid, int cpu, int timeout_msec)) \
             IP27PROM_WAITSLAVE)

#define LAUNCH_POLL (*(launch_state_t (*)(int nasid, int cpu)) \
             IP27PROM_POLLSLAVE)

#define LAUNCH_LOOP (*(void (*)(void)) \
             IP27PROM_SLAVELOOP)

#define LAUNCH_FLASH    (*(void (*)(void)) \
             IP27PROM_FLASHLEDS)

#endif /* !__ASSEMBLY__ */

#endif /* _ASM_SN_LAUNCH_H */