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/*
* 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 */
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