include/asm-ppc64/iSeries/ItLpQueue.h

/*
 * ItLpQueue.h
 * Copyright (C) 2001  Mike Corrigan IBM Corporation
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */
#ifndef _ITLPQUEUE_H
#define _ITLPQUEUE_H

//=============================================================================
//
//	This control block defines the simple LP queue structure that is 
//	shared between the hypervisor (PLIC) and the OS in order to send 
//	events to an LP.  
//    

#include <asm/types.h>
#include <asm/ptrace.h>

struct HvLpEvent;

#define ITMaxLpQueues 8

#define NotUsed		0	// Queue will not be used by PLIC
#define DedicatedIo	1	// Queue dedicated to IO processor specified
#define DedicatedLp	2	// Queue dedicated to LP specified
#define Shared		3	// Queue shared for both IO and LP

#define LpEventStackSize 4096
#define LpEventMaxSize   256
#define LpEventAlign	 64

struct ItLpQueue
{
//
//  The xSlicCurEventPtr is the pointer to the next event stack entry that will
//  become valid.  The OS must peek at this entry to determine if it is valid.
//  PLIC will set the valid indicator as the very last store into that entry.
//
//  When the OS has completed processing of the event then it will mark the event
//  as invalid so that PLIC knows it can store into that event location again.
//
// If the event stack fills and there are overflow events, then PLIC will set 
// the xPlicOverflowIntPending flag in which case the OS will have to fetch the 
// additional LP events once they have drained the event stack.
//
// The first 16-bytes are known by both the OS and PLIC.  The remainder of the
// cache line is for use by the OS.
//
//=============================================================================
	u8	xPlicOverflowIntPending;// 0x00 Overflow events are pending
	u8	xPlicStatus;		// 0x01 DedicatedIo or DedicatedLp or NotUsed
	u16	xSlicLogicalProcIndex;	// 0x02 Logical Proc Index for correlation
	u8	xPlicRsvd[12];		// 0x04
	char*	xSlicCurEventPtr;	// 0x10
	char*	xSlicLastValidEventPtr;	// 0x18
	char*	xSlicEventStackPtr;	// 0x20
	u8	xIndex;			// 0x28 unique sequential index.
	u8	xSlicRsvd[3];		// 0x29-2b
	u32	xInUseWord;		// 0x2C
	u64	xLpIntCount;		// 0x30 Total Lp Int msgs processed
	u64	xLpIntCountByType[9];	// 0x38-0x7F Event counts by type
};

extern struct ItLpQueue xItLpQueue;

extern struct HvLpEvent * ItLpQueue_getNextLpEvent( struct ItLpQueue * );
extern int ItLpQueue_isLpIntPending( struct ItLpQueue * ); 
extern unsigned ItLpQueue_process( struct ItLpQueue *, struct pt_regs * );
extern void ItLpQueue_clearValid( struct HvLpEvent * );

static __inline__ void process_iSeries_events( void )
{
	__asm__ __volatile__ (
	"	li	0,0x5555	\n\
		sc"
	: : : "r0", "r3" );	
}

#endif /* _ITLPQUEUE_H */