| /* |
| * 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 hvlpevent_queue { |
| /* |
| * 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 |
| spinlock_t lock; |
| }; |
| |
| extern struct hvlpevent_queue hvlpevent_queue; |
| |
| extern int hvlpevent_is_pending(void); |
| extern void process_hvlpevents(struct pt_regs *); |
| extern void setup_hvlpevent_queue(void); |
| |
| #endif /* _ITLPQUEUE_H */ |
