3 * Copyright (C) 2001 Mike Corrigan IBM Corporation
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 * This control block defines the simple LP queue structure that is
24 * shared between the hypervisor (PLIC) and the OS in order to send
28 #include <asm/types.h>
29 #include <asm/ptrace.h>
33 #define ITMaxLpQueues 8
35 #define NotUsed 0 // Queue will not be used by PLIC
36 #define DedicatedIo 1 // Queue dedicated to IO processor specified
37 #define DedicatedLp 2 // Queue dedicated to LP specified
38 #define Shared 3 // Queue shared for both IO and LP
40 #define LpEventStackSize 4096
41 #define LpEventMaxSize 256
42 #define LpEventAlign 64
46 * The xSlicCurEventPtr is the pointer to the next event stack entry
47 * that will become valid. The OS must peek at this entry to determine
48 * if it is valid. PLIC will set the valid indicator as the very last
49 * store into that entry.
51 * When the OS has completed processing of the event then it will mark
52 * the event as invalid so that PLIC knows it can store into that event
55 * If the event stack fills and there are overflow events, then PLIC
56 * will set the xPlicOverflowIntPending flag in which case the OS will
57 * have to fetch the additional LP events once they have drained the
60 * The first 16-bytes are known by both the OS and PLIC. The remainder
61 * of the cache line is for use by the OS.
63 u8 xPlicOverflowIntPending;// 0x00 Overflow events are pending
64 u8 xPlicStatus; // 0x01 DedicatedIo or DedicatedLp or NotUsed
65 u16 xSlicLogicalProcIndex; // 0x02 Logical Proc Index for correlation
66 u8 xPlicRsvd[12]; // 0x04
67 char *xSlicCurEventPtr; // 0x10
68 char *xSlicLastValidEventPtr; // 0x18
69 char *xSlicEventStackPtr; // 0x20
70 u8 xIndex; // 0x28 unique sequential index.
71 u8 xSlicRsvd[3]; // 0x29-2b
72 u32 xInUseWord; // 0x2C
73 u64 xLpIntCount; // 0x30 Total Lp Int msgs processed
74 u64 xLpIntCountByType[9]; // 0x38-0x7F Event counts by type
77 extern struct ItLpQueue xItLpQueue;
79 extern struct HvLpEvent *ItLpQueue_getNextLpEvent(struct ItLpQueue *);
80 extern int ItLpQueue_isLpIntPending(struct ItLpQueue *);
81 extern unsigned ItLpQueue_process(struct ItLpQueue *, struct pt_regs *);
82 extern void ItLpQueue_clearValid(struct HvLpEvent *);
84 #endif /* _ITLPQUEUE_H */