2009-02-10 20:10:44 +00:00
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/*
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2012-11-01 18:53:42 +00:00
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* Copyright 2009 Freescale Semiconductor, Inc.
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2009-02-10 20:10:44 +00:00
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* provides masks and opcode images for use by code generation, emulation
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* and for instructions that older assemblers might not know about
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*/
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#ifndef _ASM_POWERPC_PPC_OPCODE_H
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#define _ASM_POWERPC_PPC_OPCODE_H
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#include <linux/stringify.h>
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#include <asm/asm-compat.h>
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2012-06-25 13:33:22 +00:00
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#define __REG_R0 0
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#define __REG_R1 1
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#define __REG_R2 2
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#define __REG_R3 3
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#define __REG_R4 4
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#define __REG_R5 5
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#define __REG_R6 6
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#define __REG_R7 7
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#define __REG_R8 8
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#define __REG_R9 9
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#define __REG_R10 10
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#define __REG_R11 11
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#define __REG_R12 12
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#define __REG_R13 13
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#define __REG_R14 14
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#define __REG_R15 15
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#define __REG_R16 16
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#define __REG_R17 17
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#define __REG_R18 18
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#define __REG_R19 19
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#define __REG_R20 20
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#define __REG_R21 21
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#define __REG_R22 22
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#define __REG_R23 23
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#define __REG_R24 24
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#define __REG_R25 25
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#define __REG_R26 26
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#define __REG_R27 27
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#define __REG_R28 28
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#define __REG_R29 29
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#define __REG_R30 30
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#define __REG_R31 31
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2012-06-25 13:33:24 +00:00
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#define __REGA0_0 0
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#define __REGA0_R1 1
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#define __REGA0_R2 2
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#define __REGA0_R3 3
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#define __REGA0_R4 4
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#define __REGA0_R5 5
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#define __REGA0_R6 6
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#define __REGA0_R7 7
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#define __REGA0_R8 8
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#define __REGA0_R9 9
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#define __REGA0_R10 10
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#define __REGA0_R11 11
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#define __REGA0_R12 12
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#define __REGA0_R13 13
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#define __REGA0_R14 14
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#define __REGA0_R15 15
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#define __REGA0_R16 16
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#define __REGA0_R17 17
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#define __REGA0_R18 18
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#define __REGA0_R19 19
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#define __REGA0_R20 20
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#define __REGA0_R21 21
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#define __REGA0_R22 22
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#define __REGA0_R23 23
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#define __REGA0_R24 24
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#define __REGA0_R25 25
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#define __REGA0_R26 26
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#define __REGA0_R27 27
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#define __REGA0_R28 28
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#define __REGA0_R29 29
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#define __REGA0_R30 30
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#define __REGA0_R31 31
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2013-04-28 05:20:07 +00:00
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/* opcode and xopcode for instructions */
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#define OP_TRAP 3
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#define OP_TRAP_64 2
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#define OP_31_XOP_TRAP 4
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#define OP_31_XOP_LWZX 23
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#define OP_31_XOP_DCBST 54
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#define OP_31_XOP_LWZUX 55
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#define OP_31_XOP_TRAP_64 68
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#define OP_31_XOP_DCBF 86
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#define OP_31_XOP_LBZX 87
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#define OP_31_XOP_STWX 151
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#define OP_31_XOP_STBX 215
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#define OP_31_XOP_LBZUX 119
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#define OP_31_XOP_STBUX 247
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#define OP_31_XOP_LHZX 279
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#define OP_31_XOP_LHZUX 311
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#define OP_31_XOP_MFSPR 339
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#define OP_31_XOP_LHAX 343
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#define OP_31_XOP_LHAUX 375
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#define OP_31_XOP_STHX 407
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#define OP_31_XOP_STHUX 439
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#define OP_31_XOP_MTSPR 467
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#define OP_31_XOP_DCBI 470
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#define OP_31_XOP_LWBRX 534
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#define OP_31_XOP_TLBSYNC 566
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#define OP_31_XOP_STWBRX 662
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#define OP_31_XOP_LHBRX 790
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#define OP_31_XOP_STHBRX 918
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#define OP_LWZ 32
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#define OP_LD 58
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#define OP_LWZU 33
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#define OP_LBZ 34
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#define OP_LBZU 35
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#define OP_STW 36
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#define OP_STWU 37
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#define OP_STD 62
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#define OP_STB 38
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#define OP_STBU 39
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#define OP_LHZ 40
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#define OP_LHZU 41
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#define OP_LHA 42
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#define OP_LHAU 43
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#define OP_STH 44
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#define OP_STHU 45
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2009-02-10 20:10:44 +00:00
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/* sorted alphabetically */
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2013-04-22 19:42:40 +00:00
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#define PPC_INST_BHRBE 0x7c00025c
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#define PPC_INST_CLRBHRB 0x7c00035c
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2009-02-10 20:10:44 +00:00
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#define PPC_INST_DCBA 0x7c0005ec
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#define PPC_INST_DCBA_MASK 0xfc0007fe
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#define PPC_INST_DCBAL 0x7c2005ec
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#define PPC_INST_DCBZL 0x7c2007ec
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2012-10-02 15:52:19 +00:00
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#define PPC_INST_ICBT 0x7c00002c
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2015-05-07 17:49:13 +00:00
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#define PPC_INST_ICSWX 0x7c00032d
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#define PPC_INST_ICSWEPX 0x7c00076d
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2009-02-10 20:10:44 +00:00
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#define PPC_INST_ISEL 0x7c00001e
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#define PPC_INST_ISEL_MASK 0xfc00003e
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2010-02-10 01:02:36 +00:00
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#define PPC_INST_LDARX 0x7c0000a8
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Use the POWER8 Micro Partition Prefetch Engine in KVM HV on POWER8
The POWER8 processor has a Micro Partition Prefetch Engine, which is
a fancy way of saying "has way to store and load contents of L2 or
L2+MRU way of L3 cache". We initiate the storing of the log (list of
addresses) using the logmpp instruction and start restore by writing
to a SPR.
The logmpp instruction takes parameters in a single 64bit register:
- starting address of the table to store log of L2/L2+L3 cache contents
- 32kb for L2
- 128kb for L2+L3
- Aligned relative to maximum size of the table (32kb or 128kb)
- Log control (no-op, L2 only, L2 and L3, abort logout)
We should abort any ongoing logging before initiating one.
To initiate restore, we write to the MPPR SPR. The format of what to write
to the SPR is similar to the logmpp instruction parameter:
- starting address of the table to read from (same alignment requirements)
- table size (no data, until end of table)
- prefetch rate (from fastest possible to slower. about every 8, 16, 24 or
32 cycles)
The idea behind loading and storing the contents of L2/L3 cache is to
reduce memory latency in a system that is frequently swapping vcores on
a physical CPU.
The best case scenario for doing this is when some vcores are doing very
cache heavy workloads. The worst case is when they have about 0 cache hits,
so we just generate needless memory operations.
This implementation just does L2 store/load. In my benchmarks this proves
to be useful.
Benchmark 1:
- 16 core POWER8
- 3x Ubuntu 14.04LTS guests (LE) with 8 VCPUs each
- No split core/SMT
- two guests running sysbench memory test.
sysbench --test=memory --num-threads=8 run
- one guest running apache bench (of default HTML page)
ab -n 490000 -c 400 http://localhost/
This benchmark aims to measure performance of real world application (apache)
where other guests are cache hot with their own workloads. The sysbench memory
benchmark does pointer sized writes to a (small) memory buffer in a loop.
In this benchmark with this patch I can see an improvement both in requests
per second (~5%) and in mean and median response times (again, about 5%).
The spread of minimum and maximum response times were largely unchanged.
benchmark 2:
- Same VM config as benchmark 1
- all three guests running sysbench memory benchmark
This benchmark aims to see if there is a positive or negative affect to this
cache heavy benchmark. Although due to the nature of the benchmark (stores) we
may not see a difference in performance, but rather hopefully an improvement
in consistency of performance (when vcore switched in, don't have to wait
many times for cachelines to be pulled in)
The results of this benchmark are improvements in consistency of performance
rather than performance itself. With this patch, the few outliers in duration
go away and we get more consistent performance in each guest.
benchmark 3:
- same 3 guests and CPU configuration as benchmark 1 and 2.
- two idle guests
- 1 guest running STREAM benchmark
This scenario also saw performance improvement with this patch. On Copy and
Scale workloads from STREAM, I got 5-6% improvement with this patch. For
Add and triad, it was around 10% (or more).
benchmark 4:
- same 3 guests as previous benchmarks
- two guests running sysbench --memory, distinctly different cache heavy
workload
- one guest running STREAM benchmark.
Similar improvements to benchmark 3.
benchmark 5:
- 1 guest, 8 VCPUs, Ubuntu 14.04
- Host configured with split core (SMT8, subcores-per-core=4)
- STREAM benchmark
In this benchmark, we see a 10-20% performance improvement across the board
of STREAM benchmark results with this patch.
Based on preliminary investigation and microbenchmarks
by Prerna Saxena <prerna@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
2014-07-18 04:18:43 +00:00
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#define PPC_INST_LOGMPP 0x7c0007e4
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2009-02-10 20:10:44 +00:00
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#define PPC_INST_LSWI 0x7c0004aa
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#define PPC_INST_LSWX 0x7c00042a
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2010-03-11 05:33:25 +00:00
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#define PPC_INST_LWARX 0x7c000028
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2009-02-10 20:10:44 +00:00
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#define PPC_INST_LWSYNC 0x7c2004ac
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2013-07-03 21:26:47 +00:00
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#define PPC_INST_SYNC 0x7c0004ac
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#define PPC_INST_SYNC_MASK 0xfc0007fe
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2009-04-29 20:58:01 +00:00
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#define PPC_INST_LXVD2X 0x7c000698
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2009-02-10 20:10:44 +00:00
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#define PPC_INST_MCRXR 0x7c000400
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#define PPC_INST_MCRXR_MASK 0xfc0007fe
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#define PPC_INST_MFSPR_PVR 0x7c1f42a6
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#define PPC_INST_MFSPR_PVR_MASK 0xfc1fffff
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2011-12-08 07:20:27 +00:00
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#define PPC_INST_MFTMR 0x7c0002dc
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2009-02-10 20:10:44 +00:00
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#define PPC_INST_MSGSND 0x7c00019c
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2015-03-19 08:29:01 +00:00
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#define PPC_INST_MSGCLR 0x7c0001dc
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2012-11-14 18:49:44 +00:00
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#define PPC_INST_MSGSNDP 0x7c00011c
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2011-12-08 07:20:27 +00:00
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#define PPC_INST_MTTMR 0x7c0003dc
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2009-02-10 20:10:44 +00:00
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#define PPC_INST_NOP 0x60000000
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#define PPC_INST_POPCNTB 0x7c0000f4
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#define PPC_INST_POPCNTB_MASK 0xfc0007fe
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2010-12-07 19:58:17 +00:00
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#define PPC_INST_POPCNTD 0x7c0003f4
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#define PPC_INST_POPCNTW 0x7c0002f4
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2009-02-10 20:10:44 +00:00
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#define PPC_INST_RFCI 0x4c000066
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#define PPC_INST_RFDI 0x4c00004e
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#define PPC_INST_RFMCI 0x4c00004c
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2011-03-02 15:18:48 +00:00
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#define PPC_INST_MFSPR_DSCR 0x7c1102a6
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#define PPC_INST_MFSPR_DSCR_MASK 0xfc1fffff
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#define PPC_INST_MTSPR_DSCR 0x7c1103a6
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#define PPC_INST_MTSPR_DSCR_MASK 0xfc1fffff
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2013-05-01 20:06:33 +00:00
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#define PPC_INST_MFSPR_DSCR_USER 0x7c0302a6
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#define PPC_INST_MFSPR_DSCR_USER_MASK 0xfc1fffff
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#define PPC_INST_MTSPR_DSCR_USER 0x7c0303a6
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#define PPC_INST_MTSPR_DSCR_USER_MASK 0xfc1fffff
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KVM: PPC: Implement MMIO emulation support for Book3S HV guests
This provides the low-level support for MMIO emulation in Book3S HV
guests. When the guest tries to map a page which is not covered by
any memslot, that page is taken to be an MMIO emulation page. Instead
of inserting a valid HPTE, we insert an HPTE that has the valid bit
clear but another hypervisor software-use bit set, which we call
HPTE_V_ABSENT, to indicate that this is an absent page. An
absent page is treated much like a valid page as far as guest hcalls
(H_ENTER, H_REMOVE, H_READ etc.) are concerned, except of course that
an absent HPTE doesn't need to be invalidated with tlbie since it
was never valid as far as the hardware is concerned.
When the guest accesses a page for which there is an absent HPTE, it
will take a hypervisor data storage interrupt (HDSI) since we now set
the VPM1 bit in the LPCR. Our HDSI handler for HPTE-not-present faults
looks up the hash table and if it finds an absent HPTE mapping the
requested virtual address, will switch to kernel mode and handle the
fault in kvmppc_book3s_hv_page_fault(), which at present just calls
kvmppc_hv_emulate_mmio() to set up the MMIO emulation.
This is based on an earlier patch by Benjamin Herrenschmidt, but since
heavily reworked.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
2011-12-12 12:36:37 +00:00
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#define PPC_INST_SLBFEE 0x7c0007a7
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2009-02-10 20:10:44 +00:00
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#define PPC_INST_STRING 0x7c00042a
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#define PPC_INST_STRING_MASK 0xfc0007fe
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#define PPC_INST_STRING_GEN_MASK 0xfc00067e
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#define PPC_INST_STSWI 0x7c0005aa
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#define PPC_INST_STSWX 0x7c00052a
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2009-04-29 20:58:01 +00:00
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#define PPC_INST_STXVD2X 0x7c000798
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2009-04-29 20:58:01 +00:00
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#define PPC_INST_TLBIE 0x7c000264
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2009-04-06 20:25:52 +00:00
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#define PPC_INST_TLBILX 0x7c000024
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2009-02-10 20:10:44 +00:00
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#define PPC_INST_WAIT 0x7c00007c
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2009-07-23 23:15:11 +00:00
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#define PPC_INST_TLBIVAX 0x7c000624
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#define PPC_INST_TLBSRX_DOT 0x7c0006a5
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powerpc: Emulate most Book I instructions in emulate_step()
This extends the emulate_step() function to handle a large proportion
of the Book I instructions implemented on current 64-bit server
processors. The aim is to handle all the load and store instructions
used in the kernel, plus all of the instructions that appear between
l[wd]arx and st[wd]cx., so this handles the Altivec/VMX lvx and stvx
and the VSX lxv2dx and stxv2dx instructions (implemented in POWER7).
The new code can emulate user mode instructions, and checks the
effective address for a load or store if the saved state is for
user mode. It doesn't handle little-endian mode at present.
For floating-point, Altivec/VMX and VSX instructions, it checks
that the saved MSR has the enable bit for the relevant facility
set, and if so, assumes that the FP/VMX/VSX registers contain
valid state, and does loads or stores directly to/from the
FP/VMX/VSX registers, using assembly helpers in ldstfp.S.
Instructions supported now include:
* Loads and stores, including some but not all VMX and VSX instructions,
and lmw/stmw
* Atomic loads and stores (l[dw]arx, st[dw]cx.)
* Arithmetic instructions (add, subtract, multiply, divide, etc.)
* Compare instructions
* Rotate and mask instructions
* Shift instructions
* Logical instructions (and, or, xor, etc.)
* Condition register logical instructions
* mtcrf, cntlz[wd], exts[bhw]
* isync, sync, lwsync, ptesync, eieio
* Cache operations (dcbf, dcbst, dcbt, dcbtst)
The overflow-checking arithmetic instructions are not included, but
they appear not to be ever used in C code.
This uses decimal values for the minor opcodes in the switch statements
because that is what appears in the Power ISA specification, thus it is
easier to check that they are correct if they are in decimal.
If this is used to single-step an instruction where a data breakpoint
interrupt occurred, then there is the possibility that the instruction
is a lwarx or ldarx. In that case we have to be careful not to lose the
reservation until we get to the matching st[wd]cx., or we'll never make
forward progress. One alternative is to try to arrange that we can
return from interrupts and handle data breakpoint interrupts without
losing the reservation, which means not using any spinlocks, mutexes,
or atomic ops (including bitops). That seems rather fragile. The
other alternative is to emulate the larx/stcx and all the instructions
in between. This is why this commit adds support for a wide range
of integer instructions.
Signed-off-by: Paul Mackerras <paulus@samba.org>
2010-06-15 04:48:58 +00:00
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#define PPC_INST_XXLOR 0xf0000510
|
2013-09-23 02:04:39 +00:00
|
|
|
#define PPC_INST_XXSWAPD 0xf0000250
|
2012-09-10 00:35:26 +00:00
|
|
|
#define PPC_INST_XVCPSGNDP 0xf0000780
|
2013-02-13 16:21:30 +00:00
|
|
|
#define PPC_INST_TRECHKPT 0x7c0007dd
|
|
|
|
|
#define PPC_INST_TRECLAIM 0x7c00075d
|
|
|
|
|
#define PPC_INST_TABORT 0x7c00071d
|
2009-02-10 20:10:44 +00:00
|
|
|
|
2011-01-24 07:42:41 +00:00
|
|
|
#define PPC_INST_NAP 0x4c000364
|
|
|
|
|
#define PPC_INST_SLEEP 0x4c0003a4
|
2014-12-09 18:56:53 +00:00
|
|
|
#define PPC_INST_WINKLE 0x4c0003e4
|
2011-01-24 07:42:41 +00:00
|
|
|
|
2011-04-14 22:31:56 +00:00
|
|
|
/* A2 specific instructions */
|
|
|
|
|
#define PPC_INST_ERATWE 0x7c0001a6
|
|
|
|
|
#define PPC_INST_ERATRE 0x7c000166
|
|
|
|
|
#define PPC_INST_ERATILX 0x7c000066
|
|
|
|
|
#define PPC_INST_ERATIVAX 0x7c000666
|
|
|
|
|
#define PPC_INST_ERATSX 0x7c000126
|
|
|
|
|
#define PPC_INST_ERATSX_DOT 0x7c000127
|
|
|
|
|
|
2011-07-20 15:51:00 +00:00
|
|
|
/* Misc instructions for BPF compiler */
|
2014-10-30 06:12:15 +00:00
|
|
|
#define PPC_INST_LBZ 0x88000000
|
2011-07-20 15:51:00 +00:00
|
|
|
#define PPC_INST_LD 0xe8000000
|
|
|
|
|
#define PPC_INST_LHZ 0xa0000000
|
2013-09-24 12:13:35 +00:00
|
|
|
#define PPC_INST_LHBRX 0x7c00062c
|
2011-07-20 15:51:00 +00:00
|
|
|
#define PPC_INST_LWZ 0x80000000
|
|
|
|
|
#define PPC_INST_STD 0xf8000000
|
|
|
|
|
#define PPC_INST_STDU 0xf8000001
|
2015-02-17 07:04:39 +00:00
|
|
|
#define PPC_INST_STW 0x90000000
|
|
|
|
|
#define PPC_INST_STWU 0x94000000
|
2011-07-20 15:51:00 +00:00
|
|
|
#define PPC_INST_MFLR 0x7c0802a6
|
|
|
|
|
#define PPC_INST_MTLR 0x7c0803a6
|
|
|
|
|
#define PPC_INST_CMPWI 0x2c000000
|
|
|
|
|
#define PPC_INST_CMPDI 0x2c200000
|
|
|
|
|
#define PPC_INST_CMPLW 0x7c000040
|
|
|
|
|
#define PPC_INST_CMPLWI 0x28000000
|
|
|
|
|
#define PPC_INST_ADDI 0x38000000
|
|
|
|
|
#define PPC_INST_ADDIS 0x3c000000
|
|
|
|
|
#define PPC_INST_ADD 0x7c000214
|
|
|
|
|
#define PPC_INST_SUB 0x7c000050
|
|
|
|
|
#define PPC_INST_BLR 0x4e800020
|
|
|
|
|
#define PPC_INST_BLRL 0x4e800021
|
|
|
|
|
#define PPC_INST_MULLW 0x7c0001d6
|
|
|
|
|
#define PPC_INST_MULHWU 0x7c000016
|
|
|
|
|
#define PPC_INST_MULLI 0x1c000000
|
2013-09-28 08:22:00 +00:00
|
|
|
#define PPC_INST_DIVWU 0x7c000396
|
2011-07-20 15:51:00 +00:00
|
|
|
#define PPC_INST_RLWINM 0x54000000
|
|
|
|
|
#define PPC_INST_RLDICR 0x78000004
|
|
|
|
|
#define PPC_INST_SLW 0x7c000030
|
|
|
|
|
#define PPC_INST_SRW 0x7c000430
|
|
|
|
|
#define PPC_INST_AND 0x7c000038
|
|
|
|
|
#define PPC_INST_ANDDOT 0x7c000039
|
|
|
|
|
#define PPC_INST_OR 0x7c000378
|
2012-11-08 11:39:41 +00:00
|
|
|
#define PPC_INST_XOR 0x7c000278
|
2011-07-20 15:51:00 +00:00
|
|
|
#define PPC_INST_ANDI 0x70000000
|
|
|
|
|
#define PPC_INST_ORI 0x60000000
|
|
|
|
|
#define PPC_INST_ORIS 0x64000000
|
2012-11-08 11:39:41 +00:00
|
|
|
#define PPC_INST_XORI 0x68000000
|
|
|
|
|
#define PPC_INST_XORIS 0x6c000000
|
2011-07-20 15:51:00 +00:00
|
|
|
#define PPC_INST_NEG 0x7c0000d0
|
|
|
|
|
#define PPC_INST_BRANCH 0x48000000
|
|
|
|
|
#define PPC_INST_BRANCH_COND 0x40800000
|
2012-06-25 13:33:13 +00:00
|
|
|
#define PPC_INST_LBZCIX 0x7c0006aa
|
|
|
|
|
#define PPC_INST_STBCIX 0x7c0007aa
|
2011-07-20 15:51:00 +00:00
|
|
|
|
2009-02-10 20:10:44 +00:00
|
|
|
/* macros to insert fields into opcodes */
|
2012-06-25 13:33:20 +00:00
|
|
|
#define ___PPC_RA(a) (((a) & 0x1f) << 16)
|
|
|
|
|
#define ___PPC_RB(b) (((b) & 0x1f) << 11)
|
|
|
|
|
#define ___PPC_RS(s) (((s) & 0x1f) << 21)
|
|
|
|
|
#define ___PPC_RT(t) ___PPC_RS(t)
|
2012-06-25 13:33:23 +00:00
|
|
|
#define __PPC_RA(a) ___PPC_RA(__REG_##a)
|
2012-06-25 13:33:24 +00:00
|
|
|
#define __PPC_RA0(a) ___PPC_RA(__REGA0_##a)
|
2012-06-25 13:33:23 +00:00
|
|
|
#define __PPC_RB(b) ___PPC_RB(__REG_##b)
|
|
|
|
|
#define __PPC_RS(s) ___PPC_RS(__REG_##s)
|
|
|
|
|
#define __PPC_RT(t) ___PPC_RT(__REG_##t)
|
powerpc: Emulate most Book I instructions in emulate_step()
This extends the emulate_step() function to handle a large proportion
of the Book I instructions implemented on current 64-bit server
processors. The aim is to handle all the load and store instructions
used in the kernel, plus all of the instructions that appear between
l[wd]arx and st[wd]cx., so this handles the Altivec/VMX lvx and stvx
and the VSX lxv2dx and stxv2dx instructions (implemented in POWER7).
The new code can emulate user mode instructions, and checks the
effective address for a load or store if the saved state is for
user mode. It doesn't handle little-endian mode at present.
For floating-point, Altivec/VMX and VSX instructions, it checks
that the saved MSR has the enable bit for the relevant facility
set, and if so, assumes that the FP/VMX/VSX registers contain
valid state, and does loads or stores directly to/from the
FP/VMX/VSX registers, using assembly helpers in ldstfp.S.
Instructions supported now include:
* Loads and stores, including some but not all VMX and VSX instructions,
and lmw/stmw
* Atomic loads and stores (l[dw]arx, st[dw]cx.)
* Arithmetic instructions (add, subtract, multiply, divide, etc.)
* Compare instructions
* Rotate and mask instructions
* Shift instructions
* Logical instructions (and, or, xor, etc.)
* Condition register logical instructions
* mtcrf, cntlz[wd], exts[bhw]
* isync, sync, lwsync, ptesync, eieio
* Cache operations (dcbf, dcbst, dcbt, dcbtst)
The overflow-checking arithmetic instructions are not included, but
they appear not to be ever used in C code.
This uses decimal values for the minor opcodes in the switch statements
because that is what appears in the Power ISA specification, thus it is
easier to check that they are correct if they are in decimal.
If this is used to single-step an instruction where a data breakpoint
interrupt occurred, then there is the possibility that the instruction
is a lwarx or ldarx. In that case we have to be careful not to lose the
reservation until we get to the matching st[wd]cx., or we'll never make
forward progress. One alternative is to try to arrange that we can
return from interrupts and handle data breakpoint interrupts without
losing the reservation, which means not using any spinlocks, mutexes,
or atomic ops (including bitops). That seems rather fragile. The
other alternative is to emulate the larx/stcx and all the instructions
in between. This is why this commit adds support for a wide range
of integer instructions.
Signed-off-by: Paul Mackerras <paulus@samba.org>
2010-06-15 04:48:58 +00:00
|
|
|
#define __PPC_XA(a) ((((a) & 0x1f) << 16) | (((a) & 0x20) >> 3))
|
|
|
|
|
#define __PPC_XB(b) ((((b) & 0x1f) << 11) | (((b) & 0x20) >> 4))
|
2009-04-29 20:58:01 +00:00
|
|
|
#define __PPC_XS(s) ((((s) & 0x1f) << 21) | (((s) & 0x20) >> 5))
|
powerpc: Emulate most Book I instructions in emulate_step()
This extends the emulate_step() function to handle a large proportion
of the Book I instructions implemented on current 64-bit server
processors. The aim is to handle all the load and store instructions
used in the kernel, plus all of the instructions that appear between
l[wd]arx and st[wd]cx., so this handles the Altivec/VMX lvx and stvx
and the VSX lxv2dx and stxv2dx instructions (implemented in POWER7).
The new code can emulate user mode instructions, and checks the
effective address for a load or store if the saved state is for
user mode. It doesn't handle little-endian mode at present.
For floating-point, Altivec/VMX and VSX instructions, it checks
that the saved MSR has the enable bit for the relevant facility
set, and if so, assumes that the FP/VMX/VSX registers contain
valid state, and does loads or stores directly to/from the
FP/VMX/VSX registers, using assembly helpers in ldstfp.S.
Instructions supported now include:
* Loads and stores, including some but not all VMX and VSX instructions,
and lmw/stmw
* Atomic loads and stores (l[dw]arx, st[dw]cx.)
* Arithmetic instructions (add, subtract, multiply, divide, etc.)
* Compare instructions
* Rotate and mask instructions
* Shift instructions
* Logical instructions (and, or, xor, etc.)
* Condition register logical instructions
* mtcrf, cntlz[wd], exts[bhw]
* isync, sync, lwsync, ptesync, eieio
* Cache operations (dcbf, dcbst, dcbt, dcbtst)
The overflow-checking arithmetic instructions are not included, but
they appear not to be ever used in C code.
This uses decimal values for the minor opcodes in the switch statements
because that is what appears in the Power ISA specification, thus it is
easier to check that they are correct if they are in decimal.
If this is used to single-step an instruction where a data breakpoint
interrupt occurred, then there is the possibility that the instruction
is a lwarx or ldarx. In that case we have to be careful not to lose the
reservation until we get to the matching st[wd]cx., or we'll never make
forward progress. One alternative is to try to arrange that we can
return from interrupts and handle data breakpoint interrupts without
losing the reservation, which means not using any spinlocks, mutexes,
or atomic ops (including bitops). That seems rather fragile. The
other alternative is to emulate the larx/stcx and all the instructions
in between. This is why this commit adds support for a wide range
of integer instructions.
Signed-off-by: Paul Mackerras <paulus@samba.org>
2010-06-15 04:48:58 +00:00
|
|
|
#define __PPC_XT(s) __PPC_XS(s)
|
2009-04-29 20:58:01 +00:00
|
|
|
#define __PPC_T_TLB(t) (((t) & 0x3) << 21)
|
|
|
|
|
#define __PPC_WC(w) (((w) & 0x3) << 21)
|
2011-04-14 22:31:56 +00:00
|
|
|
#define __PPC_WS(w) (((w) & 0x1f) << 11)
|
2011-07-20 15:51:00 +00:00
|
|
|
#define __PPC_SH(s) __PPC_WS(s)
|
|
|
|
|
#define __PPC_MB(s) (((s) & 0x1f) << 6)
|
|
|
|
|
#define __PPC_ME(s) (((s) & 0x1f) << 1)
|
|
|
|
|
#define __PPC_BI(s) (((s) & 0x1f) << 16)
|
2012-10-02 15:52:19 +00:00
|
|
|
#define __PPC_CT(t) (((t) & 0x0f) << 21)
|
2011-04-14 22:31:56 +00:00
|
|
|
|
2010-02-10 00:57:28 +00:00
|
|
|
/*
|
2010-03-11 05:33:25 +00:00
|
|
|
* Only use the larx hint bit on 64bit CPUs. e500v1/v2 based CPUs will treat a
|
|
|
|
|
* larx with EH set as an illegal instruction.
|
2010-02-10 00:57:28 +00:00
|
|
|
*/
|
|
|
|
|
#ifdef CONFIG_PPC64
|
|
|
|
|
#define __PPC_EH(eh) (((eh) & 0x1) << 0)
|
|
|
|
|
#else
|
|
|
|
|
#define __PPC_EH(eh) 0
|
|
|
|
|
#endif
|
2009-02-10 20:10:44 +00:00
|
|
|
|
Use the POWER8 Micro Partition Prefetch Engine in KVM HV on POWER8
The POWER8 processor has a Micro Partition Prefetch Engine, which is
a fancy way of saying "has way to store and load contents of L2 or
L2+MRU way of L3 cache". We initiate the storing of the log (list of
addresses) using the logmpp instruction and start restore by writing
to a SPR.
The logmpp instruction takes parameters in a single 64bit register:
- starting address of the table to store log of L2/L2+L3 cache contents
- 32kb for L2
- 128kb for L2+L3
- Aligned relative to maximum size of the table (32kb or 128kb)
- Log control (no-op, L2 only, L2 and L3, abort logout)
We should abort any ongoing logging before initiating one.
To initiate restore, we write to the MPPR SPR. The format of what to write
to the SPR is similar to the logmpp instruction parameter:
- starting address of the table to read from (same alignment requirements)
- table size (no data, until end of table)
- prefetch rate (from fastest possible to slower. about every 8, 16, 24 or
32 cycles)
The idea behind loading and storing the contents of L2/L3 cache is to
reduce memory latency in a system that is frequently swapping vcores on
a physical CPU.
The best case scenario for doing this is when some vcores are doing very
cache heavy workloads. The worst case is when they have about 0 cache hits,
so we just generate needless memory operations.
This implementation just does L2 store/load. In my benchmarks this proves
to be useful.
Benchmark 1:
- 16 core POWER8
- 3x Ubuntu 14.04LTS guests (LE) with 8 VCPUs each
- No split core/SMT
- two guests running sysbench memory test.
sysbench --test=memory --num-threads=8 run
- one guest running apache bench (of default HTML page)
ab -n 490000 -c 400 http://localhost/
This benchmark aims to measure performance of real world application (apache)
where other guests are cache hot with their own workloads. The sysbench memory
benchmark does pointer sized writes to a (small) memory buffer in a loop.
In this benchmark with this patch I can see an improvement both in requests
per second (~5%) and in mean and median response times (again, about 5%).
The spread of minimum and maximum response times were largely unchanged.
benchmark 2:
- Same VM config as benchmark 1
- all three guests running sysbench memory benchmark
This benchmark aims to see if there is a positive or negative affect to this
cache heavy benchmark. Although due to the nature of the benchmark (stores) we
may not see a difference in performance, but rather hopefully an improvement
in consistency of performance (when vcore switched in, don't have to wait
many times for cachelines to be pulled in)
The results of this benchmark are improvements in consistency of performance
rather than performance itself. With this patch, the few outliers in duration
go away and we get more consistent performance in each guest.
benchmark 3:
- same 3 guests and CPU configuration as benchmark 1 and 2.
- two idle guests
- 1 guest running STREAM benchmark
This scenario also saw performance improvement with this patch. On Copy and
Scale workloads from STREAM, I got 5-6% improvement with this patch. For
Add and triad, it was around 10% (or more).
benchmark 4:
- same 3 guests as previous benchmarks
- two guests running sysbench --memory, distinctly different cache heavy
workload
- one guest running STREAM benchmark.
Similar improvements to benchmark 3.
benchmark 5:
- 1 guest, 8 VCPUs, Ubuntu 14.04
- Host configured with split core (SMT8, subcores-per-core=4)
- STREAM benchmark
In this benchmark, we see a 10-20% performance improvement across the board
of STREAM benchmark results with this patch.
Based on preliminary investigation and microbenchmarks
by Prerna Saxena <prerna@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
2014-07-18 04:18:43 +00:00
|
|
|
/* POWER8 Micro Partition Prefetch (MPP) parameters */
|
|
|
|
|
/* Address mask is common for LOGMPP instruction and MPPR SPR */
|
|
|
|
|
#define PPC_MPPE_ADDRESS_MASK 0xffffffffc000
|
|
|
|
|
|
|
|
|
|
/* Bits 60 and 61 of MPP SPR should be set to one of the following */
|
|
|
|
|
/* Aborting the fetch is indeed setting 00 in the table size bits */
|
|
|
|
|
#define PPC_MPPR_FETCH_ABORT (0x0ULL << 60)
|
|
|
|
|
#define PPC_MPPR_FETCH_WHOLE_TABLE (0x2ULL << 60)
|
|
|
|
|
|
|
|
|
|
/* Bits 54 and 55 of register for LOGMPP instruction should be set to: */
|
|
|
|
|
#define PPC_LOGMPP_LOG_L2 (0x02ULL << 54)
|
|
|
|
|
#define PPC_LOGMPP_LOG_L2L3 (0x01ULL << 54)
|
|
|
|
|
#define PPC_LOGMPP_LOG_ABORT (0x03ULL << 54)
|
|
|
|
|
|
2009-02-10 20:10:44 +00:00
|
|
|
/* Deal with instructions that older assemblers aren't aware of */
|
|
|
|
|
#define PPC_DCBAL(a, b) stringify_in_c(.long PPC_INST_DCBAL | \
|
|
|
|
|
__PPC_RA(a) | __PPC_RB(b))
|
|
|
|
|
#define PPC_DCBZL(a, b) stringify_in_c(.long PPC_INST_DCBZL | \
|
|
|
|
|
__PPC_RA(a) | __PPC_RB(b))
|
2010-02-10 01:02:36 +00:00
|
|
|
#define PPC_LDARX(t, a, b, eh) stringify_in_c(.long PPC_INST_LDARX | \
|
2012-06-25 13:33:21 +00:00
|
|
|
___PPC_RT(t) | ___PPC_RA(a) | \
|
|
|
|
|
___PPC_RB(b) | __PPC_EH(eh))
|
Use the POWER8 Micro Partition Prefetch Engine in KVM HV on POWER8
The POWER8 processor has a Micro Partition Prefetch Engine, which is
a fancy way of saying "has way to store and load contents of L2 or
L2+MRU way of L3 cache". We initiate the storing of the log (list of
addresses) using the logmpp instruction and start restore by writing
to a SPR.
The logmpp instruction takes parameters in a single 64bit register:
- starting address of the table to store log of L2/L2+L3 cache contents
- 32kb for L2
- 128kb for L2+L3
- Aligned relative to maximum size of the table (32kb or 128kb)
- Log control (no-op, L2 only, L2 and L3, abort logout)
We should abort any ongoing logging before initiating one.
To initiate restore, we write to the MPPR SPR. The format of what to write
to the SPR is similar to the logmpp instruction parameter:
- starting address of the table to read from (same alignment requirements)
- table size (no data, until end of table)
- prefetch rate (from fastest possible to slower. about every 8, 16, 24 or
32 cycles)
The idea behind loading and storing the contents of L2/L3 cache is to
reduce memory latency in a system that is frequently swapping vcores on
a physical CPU.
The best case scenario for doing this is when some vcores are doing very
cache heavy workloads. The worst case is when they have about 0 cache hits,
so we just generate needless memory operations.
This implementation just does L2 store/load. In my benchmarks this proves
to be useful.
Benchmark 1:
- 16 core POWER8
- 3x Ubuntu 14.04LTS guests (LE) with 8 VCPUs each
- No split core/SMT
- two guests running sysbench memory test.
sysbench --test=memory --num-threads=8 run
- one guest running apache bench (of default HTML page)
ab -n 490000 -c 400 http://localhost/
This benchmark aims to measure performance of real world application (apache)
where other guests are cache hot with their own workloads. The sysbench memory
benchmark does pointer sized writes to a (small) memory buffer in a loop.
In this benchmark with this patch I can see an improvement both in requests
per second (~5%) and in mean and median response times (again, about 5%).
The spread of minimum and maximum response times were largely unchanged.
benchmark 2:
- Same VM config as benchmark 1
- all three guests running sysbench memory benchmark
This benchmark aims to see if there is a positive or negative affect to this
cache heavy benchmark. Although due to the nature of the benchmark (stores) we
may not see a difference in performance, but rather hopefully an improvement
in consistency of performance (when vcore switched in, don't have to wait
many times for cachelines to be pulled in)
The results of this benchmark are improvements in consistency of performance
rather than performance itself. With this patch, the few outliers in duration
go away and we get more consistent performance in each guest.
benchmark 3:
- same 3 guests and CPU configuration as benchmark 1 and 2.
- two idle guests
- 1 guest running STREAM benchmark
This scenario also saw performance improvement with this patch. On Copy and
Scale workloads from STREAM, I got 5-6% improvement with this patch. For
Add and triad, it was around 10% (or more).
benchmark 4:
- same 3 guests as previous benchmarks
- two guests running sysbench --memory, distinctly different cache heavy
workload
- one guest running STREAM benchmark.
Similar improvements to benchmark 3.
benchmark 5:
- 1 guest, 8 VCPUs, Ubuntu 14.04
- Host configured with split core (SMT8, subcores-per-core=4)
- STREAM benchmark
In this benchmark, we see a 10-20% performance improvement across the board
of STREAM benchmark results with this patch.
Based on preliminary investigation and microbenchmarks
by Prerna Saxena <prerna@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
2014-07-18 04:18:43 +00:00
|
|
|
#define PPC_LOGMPP(b) stringify_in_c(.long PPC_INST_LOGMPP | \
|
|
|
|
|
__PPC_RB(b))
|
2010-02-10 00:57:28 +00:00
|
|
|
#define PPC_LWARX(t, a, b, eh) stringify_in_c(.long PPC_INST_LWARX | \
|
2012-06-25 13:33:21 +00:00
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___PPC_RT(t) | ___PPC_RA(a) | \
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___PPC_RB(b) | __PPC_EH(eh))
|
2009-02-10 20:10:44 +00:00
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#define PPC_MSGSND(b) stringify_in_c(.long PPC_INST_MSGSND | \
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2012-06-25 13:33:21 +00:00
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___PPC_RB(b))
|
2015-03-19 08:29:01 +00:00
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#define PPC_MSGCLR(b) stringify_in_c(.long PPC_INST_MSGCLR | \
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___PPC_RB(b))
|
2012-11-14 18:49:44 +00:00
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#define PPC_MSGSNDP(b) stringify_in_c(.long PPC_INST_MSGSNDP | \
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___PPC_RB(b))
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2010-12-07 19:58:17 +00:00
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#define PPC_POPCNTB(a, s) stringify_in_c(.long PPC_INST_POPCNTB | \
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__PPC_RA(a) | __PPC_RS(s))
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#define PPC_POPCNTD(a, s) stringify_in_c(.long PPC_INST_POPCNTD | \
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__PPC_RA(a) | __PPC_RS(s))
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#define PPC_POPCNTW(a, s) stringify_in_c(.long PPC_INST_POPCNTW | \
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__PPC_RA(a) | __PPC_RS(s))
|
2009-02-10 20:10:44 +00:00
|
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#define PPC_RFCI stringify_in_c(.long PPC_INST_RFCI)
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#define PPC_RFDI stringify_in_c(.long PPC_INST_RFDI)
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#define PPC_RFMCI stringify_in_c(.long PPC_INST_RFMCI)
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#define PPC_TLBILX(t, a, b) stringify_in_c(.long PPC_INST_TLBILX | \
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2012-06-25 13:33:25 +00:00
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__PPC_T_TLB(t) | __PPC_RA0(a) | __PPC_RB(b))
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2009-02-10 20:10:44 +00:00
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#define PPC_TLBILX_ALL(a, b) PPC_TLBILX(0, a, b)
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#define PPC_TLBILX_PID(a, b) PPC_TLBILX(1, a, b)
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#define PPC_TLBILX_VA(a, b) PPC_TLBILX(3, a, b)
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|
#define PPC_WAIT(w) stringify_in_c(.long PPC_INST_WAIT | \
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|
__PPC_WC(w))
|
2009-04-29 20:58:01 +00:00
|
|
|
#define PPC_TLBIE(lp,a) stringify_in_c(.long PPC_INST_TLBIE | \
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2012-06-25 13:33:21 +00:00
|
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|
___PPC_RB(a) | ___PPC_RS(lp))
|
2009-07-23 23:15:11 +00:00
|
|
|
#define PPC_TLBSRX_DOT(a,b) stringify_in_c(.long PPC_INST_TLBSRX_DOT | \
|
2012-06-25 13:33:25 +00:00
|
|
|
__PPC_RA0(a) | __PPC_RB(b))
|
2009-07-23 23:15:11 +00:00
|
|
|
#define PPC_TLBIVAX(a,b) stringify_in_c(.long PPC_INST_TLBIVAX | \
|
2012-06-25 13:33:25 +00:00
|
|
|
__PPC_RA0(a) | __PPC_RB(b))
|
2009-02-10 20:10:44 +00:00
|
|
|
|
2011-04-14 22:31:56 +00:00
|
|
|
#define PPC_ERATWE(s, a, w) stringify_in_c(.long PPC_INST_ERATWE | \
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|
__PPC_RS(s) | __PPC_RA(a) | __PPC_WS(w))
|
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|
|
#define PPC_ERATRE(s, a, w) stringify_in_c(.long PPC_INST_ERATRE | \
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|
__PPC_RS(s) | __PPC_RA(a) | __PPC_WS(w))
|
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|
#define PPC_ERATILX(t, a, b) stringify_in_c(.long PPC_INST_ERATILX | \
|
2012-06-25 13:33:25 +00:00
|
|
|
__PPC_T_TLB(t) | __PPC_RA0(a) | \
|
2011-04-14 22:31:56 +00:00
|
|
|
__PPC_RB(b))
|
|
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|
#define PPC_ERATIVAX(s, a, b) stringify_in_c(.long PPC_INST_ERATIVAX | \
|
2012-06-25 13:33:25 +00:00
|
|
|
__PPC_RS(s) | __PPC_RA0(a) | __PPC_RB(b))
|
2011-04-14 22:31:56 +00:00
|
|
|
#define PPC_ERATSX(t, a, w) stringify_in_c(.long PPC_INST_ERATSX | \
|
2012-06-25 13:33:25 +00:00
|
|
|
__PPC_RS(t) | __PPC_RA0(a) | __PPC_RB(b))
|
2011-04-14 22:31:56 +00:00
|
|
|
#define PPC_ERATSX_DOT(t, a, w) stringify_in_c(.long PPC_INST_ERATSX_DOT | \
|
2012-06-25 13:33:25 +00:00
|
|
|
__PPC_RS(t) | __PPC_RA0(a) | __PPC_RB(b))
|
KVM: PPC: Implement MMIO emulation support for Book3S HV guests
This provides the low-level support for MMIO emulation in Book3S HV
guests. When the guest tries to map a page which is not covered by
any memslot, that page is taken to be an MMIO emulation page. Instead
of inserting a valid HPTE, we insert an HPTE that has the valid bit
clear but another hypervisor software-use bit set, which we call
HPTE_V_ABSENT, to indicate that this is an absent page. An
absent page is treated much like a valid page as far as guest hcalls
(H_ENTER, H_REMOVE, H_READ etc.) are concerned, except of course that
an absent HPTE doesn't need to be invalidated with tlbie since it
was never valid as far as the hardware is concerned.
When the guest accesses a page for which there is an absent HPTE, it
will take a hypervisor data storage interrupt (HDSI) since we now set
the VPM1 bit in the LPCR. Our HDSI handler for HPTE-not-present faults
looks up the hash table and if it finds an absent HPTE mapping the
requested virtual address, will switch to kernel mode and handle the
fault in kvmppc_book3s_hv_page_fault(), which at present just calls
kvmppc_hv_emulate_mmio() to set up the MMIO emulation.
This is based on an earlier patch by Benjamin Herrenschmidt, but since
heavily reworked.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
2011-12-12 12:36:37 +00:00
|
|
|
#define PPC_SLBFEE_DOT(t, b) stringify_in_c(.long PPC_INST_SLBFEE | \
|
|
|
|
|
__PPC_RT(t) | __PPC_RB(b))
|
2012-10-02 15:52:19 +00:00
|
|
|
#define PPC_ICBT(c,a,b) stringify_in_c(.long PPC_INST_ICBT | \
|
|
|
|
|
__PPC_CT(c) | __PPC_RA0(a) | __PPC_RB(b))
|
2012-06-25 13:33:13 +00:00
|
|
|
/* PASemi instructions */
|
|
|
|
|
#define LBZCIX(t,a,b) stringify_in_c(.long PPC_INST_LBZCIX | \
|
|
|
|
|
__PPC_RT(t) | __PPC_RA(a) | __PPC_RB(b))
|
|
|
|
|
#define STBCIX(s,a,b) stringify_in_c(.long PPC_INST_STBCIX | \
|
|
|
|
|
__PPC_RS(s) | __PPC_RA(a) | __PPC_RB(b))
|
2011-04-14 22:31:56 +00:00
|
|
|
|
2009-04-29 20:58:01 +00:00
|
|
|
/*
|
|
|
|
|
* Define what the VSX XX1 form instructions will look like, then add
|
|
|
|
|
* the 128 bit load store instructions based on that.
|
|
|
|
|
*/
|
|
|
|
|
#define VSX_XX1(s, a, b) (__PPC_XS(s) | __PPC_RA(a) | __PPC_RB(b))
|
powerpc: Emulate most Book I instructions in emulate_step()
This extends the emulate_step() function to handle a large proportion
of the Book I instructions implemented on current 64-bit server
processors. The aim is to handle all the load and store instructions
used in the kernel, plus all of the instructions that appear between
l[wd]arx and st[wd]cx., so this handles the Altivec/VMX lvx and stvx
and the VSX lxv2dx and stxv2dx instructions (implemented in POWER7).
The new code can emulate user mode instructions, and checks the
effective address for a load or store if the saved state is for
user mode. It doesn't handle little-endian mode at present.
For floating-point, Altivec/VMX and VSX instructions, it checks
that the saved MSR has the enable bit for the relevant facility
set, and if so, assumes that the FP/VMX/VSX registers contain
valid state, and does loads or stores directly to/from the
FP/VMX/VSX registers, using assembly helpers in ldstfp.S.
Instructions supported now include:
* Loads and stores, including some but not all VMX and VSX instructions,
and lmw/stmw
* Atomic loads and stores (l[dw]arx, st[dw]cx.)
* Arithmetic instructions (add, subtract, multiply, divide, etc.)
* Compare instructions
* Rotate and mask instructions
* Shift instructions
* Logical instructions (and, or, xor, etc.)
* Condition register logical instructions
* mtcrf, cntlz[wd], exts[bhw]
* isync, sync, lwsync, ptesync, eieio
* Cache operations (dcbf, dcbst, dcbt, dcbtst)
The overflow-checking arithmetic instructions are not included, but
they appear not to be ever used in C code.
This uses decimal values for the minor opcodes in the switch statements
because that is what appears in the Power ISA specification, thus it is
easier to check that they are correct if they are in decimal.
If this is used to single-step an instruction where a data breakpoint
interrupt occurred, then there is the possibility that the instruction
is a lwarx or ldarx. In that case we have to be careful not to lose the
reservation until we get to the matching st[wd]cx., or we'll never make
forward progress. One alternative is to try to arrange that we can
return from interrupts and handle data breakpoint interrupts without
losing the reservation, which means not using any spinlocks, mutexes,
or atomic ops (including bitops). That seems rather fragile. The
other alternative is to emulate the larx/stcx and all the instructions
in between. This is why this commit adds support for a wide range
of integer instructions.
Signed-off-by: Paul Mackerras <paulus@samba.org>
2010-06-15 04:48:58 +00:00
|
|
|
#define VSX_XX3(t, a, b) (__PPC_XT(t) | __PPC_XA(a) | __PPC_XB(b))
|
2009-04-29 20:58:01 +00:00
|
|
|
#define STXVD2X(s, a, b) stringify_in_c(.long PPC_INST_STXVD2X | \
|
2012-06-25 13:33:19 +00:00
|
|
|
VSX_XX1((s), a, b))
|
2009-04-29 20:58:01 +00:00
|
|
|
#define LXVD2X(s, a, b) stringify_in_c(.long PPC_INST_LXVD2X | \
|
2012-06-25 13:33:19 +00:00
|
|
|
VSX_XX1((s), a, b))
|
powerpc: Emulate most Book I instructions in emulate_step()
This extends the emulate_step() function to handle a large proportion
of the Book I instructions implemented on current 64-bit server
processors. The aim is to handle all the load and store instructions
used in the kernel, plus all of the instructions that appear between
l[wd]arx and st[wd]cx., so this handles the Altivec/VMX lvx and stvx
and the VSX lxv2dx and stxv2dx instructions (implemented in POWER7).
The new code can emulate user mode instructions, and checks the
effective address for a load or store if the saved state is for
user mode. It doesn't handle little-endian mode at present.
For floating-point, Altivec/VMX and VSX instructions, it checks
that the saved MSR has the enable bit for the relevant facility
set, and if so, assumes that the FP/VMX/VSX registers contain
valid state, and does loads or stores directly to/from the
FP/VMX/VSX registers, using assembly helpers in ldstfp.S.
Instructions supported now include:
* Loads and stores, including some but not all VMX and VSX instructions,
and lmw/stmw
* Atomic loads and stores (l[dw]arx, st[dw]cx.)
* Arithmetic instructions (add, subtract, multiply, divide, etc.)
* Compare instructions
* Rotate and mask instructions
* Shift instructions
* Logical instructions (and, or, xor, etc.)
* Condition register logical instructions
* mtcrf, cntlz[wd], exts[bhw]
* isync, sync, lwsync, ptesync, eieio
* Cache operations (dcbf, dcbst, dcbt, dcbtst)
The overflow-checking arithmetic instructions are not included, but
they appear not to be ever used in C code.
This uses decimal values for the minor opcodes in the switch statements
because that is what appears in the Power ISA specification, thus it is
easier to check that they are correct if they are in decimal.
If this is used to single-step an instruction where a data breakpoint
interrupt occurred, then there is the possibility that the instruction
is a lwarx or ldarx. In that case we have to be careful not to lose the
reservation until we get to the matching st[wd]cx., or we'll never make
forward progress. One alternative is to try to arrange that we can
return from interrupts and handle data breakpoint interrupts without
losing the reservation, which means not using any spinlocks, mutexes,
or atomic ops (including bitops). That seems rather fragile. The
other alternative is to emulate the larx/stcx and all the instructions
in between. This is why this commit adds support for a wide range
of integer instructions.
Signed-off-by: Paul Mackerras <paulus@samba.org>
2010-06-15 04:48:58 +00:00
|
|
|
#define XXLOR(t, a, b) stringify_in_c(.long PPC_INST_XXLOR | \
|
2012-06-25 13:33:19 +00:00
|
|
|
VSX_XX3((t), a, b))
|
2013-09-23 02:04:39 +00:00
|
|
|
#define XXSWAPD(t, a) stringify_in_c(.long PPC_INST_XXSWAPD | \
|
|
|
|
|
VSX_XX3((t), a, a))
|
2012-09-10 00:35:26 +00:00
|
|
|
#define XVCPSGNDP(t, a, b) stringify_in_c(.long (PPC_INST_XVCPSGNDP | \
|
|
|
|
|
VSX_XX3((t), (a), (b))))
|
2009-04-29 20:58:01 +00:00
|
|
|
|
2011-01-24 07:42:41 +00:00
|
|
|
#define PPC_NAP stringify_in_c(.long PPC_INST_NAP)
|
|
|
|
|
#define PPC_SLEEP stringify_in_c(.long PPC_INST_SLEEP)
|
2014-12-09 18:56:53 +00:00
|
|
|
#define PPC_WINKLE stringify_in_c(.long PPC_INST_WINKLE)
|
2011-01-24 07:42:41 +00:00
|
|
|
|
2013-04-22 19:42:40 +00:00
|
|
|
/* BHRB instructions */
|
|
|
|
|
#define PPC_CLRBHRB stringify_in_c(.long PPC_INST_CLRBHRB)
|
|
|
|
|
#define PPC_MFBHRBE(r, n) stringify_in_c(.long PPC_INST_BHRBE | \
|
|
|
|
|
__PPC_RT(r) | \
|
|
|
|
|
(((n) & 0x3ff) << 11))
|
|
|
|
|
|
2013-02-13 16:21:30 +00:00
|
|
|
/* Transactional memory instructions */
|
|
|
|
|
#define TRECHKPT stringify_in_c(.long PPC_INST_TRECHKPT)
|
|
|
|
|
#define TRECLAIM(r) stringify_in_c(.long PPC_INST_TRECLAIM \
|
|
|
|
|
| __PPC_RA(r))
|
|
|
|
|
#define TABORT(r) stringify_in_c(.long PPC_INST_TABORT \
|
|
|
|
|
| __PPC_RA(r))
|
|
|
|
|
|
2011-12-08 07:20:27 +00:00
|
|
|
/* book3e thread control instructions */
|
|
|
|
|
#define TMRN(x) ((((x) & 0x1f) << 16) | (((x) & 0x3e0) << 6))
|
|
|
|
|
#define MTTMR(tmr, r) stringify_in_c(.long PPC_INST_MTTMR | \
|
|
|
|
|
TMRN(tmr) | ___PPC_RS(r))
|
|
|
|
|
#define MFTMR(tmr, r) stringify_in_c(.long PPC_INST_MFTMR | \
|
|
|
|
|
TMRN(tmr) | ___PPC_RT(r))
|
|
|
|
|
|
2015-05-07 17:49:13 +00:00
|
|
|
/* Coprocessor instructions */
|
|
|
|
|
#define PPC_ICSWX(s, a, b) stringify_in_c(.long PPC_INST_ICSWX | \
|
|
|
|
|
___PPC_RS(s) | \
|
|
|
|
|
___PPC_RA(a) | \
|
|
|
|
|
___PPC_RB(b))
|
|
|
|
|
#define PPC_ICSWEPX(s, a, b) stringify_in_c(.long PPC_INST_ICSWEPX | \
|
|
|
|
|
___PPC_RS(s) | \
|
|
|
|
|
___PPC_RA(a) | \
|
|
|
|
|
___PPC_RB(b))
|
|
|
|
|
|
|
|
|
|
|
2009-02-10 20:10:44 +00:00
|
|
|
#endif /* _ASM_POWERPC_PPC_OPCODE_H */
|
