virtio-scsi: suppress virtqueue kick during processing
[qemu.git] / target / tilegx / helper.c
1 /*
2 * QEMU TILE-Gx helpers
3 *
4 * Copyright (c) 2015 Chen Gang
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see
18 * <http://www.gnu.org/licenses/lgpl-2.1.html>
19 */
20
21 #include "qemu/osdep.h"
22 #include "cpu.h"
23 #include "exec/exec-all.h"
24 #include "qemu-common.h"
25 #include "exec/helper-proto.h"
26 #include <zlib.h> /* For crc32 */
27 #include "syscall_defs.h"
28
29 void helper_exception(CPUTLGState *env, uint32_t excp)
30 {
31 CPUState *cs = CPU(tilegx_env_get_cpu(env));
32
33 cs->exception_index = excp;
34 cpu_loop_exit(cs);
35 }
36
37 void helper_ext01_ics(CPUTLGState *env)
38 {
39 uint64_t val = env->spregs[TILEGX_SPR_EX_CONTEXT_0_1];
40
41 switch (val) {
42 case 0:
43 case 1:
44 env->spregs[TILEGX_SPR_CRITICAL_SEC] = val;
45 break;
46 default:
47 #if defined(CONFIG_USER_ONLY)
48 env->signo = TARGET_SIGILL;
49 env->sigcode = TARGET_ILL_ILLOPC;
50 helper_exception(env, TILEGX_EXCP_SIGNAL);
51 #else
52 helper_exception(env, TILEGX_EXCP_OPCODE_UNIMPLEMENTED);
53 #endif
54 break;
55 }
56 }
57
58 uint64_t helper_cntlz(uint64_t arg)
59 {
60 return clz64(arg);
61 }
62
63 uint64_t helper_cnttz(uint64_t arg)
64 {
65 return ctz64(arg);
66 }
67
68 uint64_t helper_pcnt(uint64_t arg)
69 {
70 return ctpop64(arg);
71 }
72
73 uint64_t helper_revbits(uint64_t arg)
74 {
75 return revbit64(arg);
76 }
77
78 /*
79 * Functional Description
80 * uint64_t a = rf[SrcA];
81 * uint64_t b = rf[SrcB];
82 * uint64_t d = rf[Dest];
83 * uint64_t output = 0;
84 * unsigned int counter;
85 * for (counter = 0; counter < (WORD_SIZE / BYTE_SIZE); counter++)
86 * {
87 * int sel = getByte (b, counter) & 0xf;
88 * uint8_t byte = (sel < 8) ? getByte (d, sel) : getByte (a, (sel - 8));
89 * output = setByte (output, counter, byte);
90 * }
91 * rf[Dest] = output;
92 */
93 uint64_t helper_shufflebytes(uint64_t dest, uint64_t srca, uint64_t srcb)
94 {
95 uint64_t vdst = 0;
96 int count;
97
98 for (count = 0; count < 64; count += 8) {
99 uint64_t sel = srcb >> count;
100 uint64_t src = (sel & 8) ? srca : dest;
101 vdst |= extract64(src, (sel & 7) * 8, 8) << count;
102 }
103
104 return vdst;
105 }
106
107 uint64_t helper_crc32_8(uint64_t accum, uint64_t input)
108 {
109 uint8_t buf = input;
110
111 /* zlib crc32 converts the accumulator and output to one's complement. */
112 return crc32(accum ^ 0xffffffff, &buf, 1) ^ 0xffffffff;
113 }
114
115 uint64_t helper_crc32_32(uint64_t accum, uint64_t input)
116 {
117 uint8_t buf[4];
118
119 stl_le_p(buf, input);
120
121 /* zlib crc32 converts the accumulator and output to one's complement. */
122 return crc32(accum ^ 0xffffffff, buf, 4) ^ 0xffffffff;
123 }
124
125 uint64_t helper_cmula(uint64_t srcd, uint64_t srca, uint64_t srcb)
126 {
127 uint32_t reala = (int16_t)srca;
128 uint32_t imaga = (int16_t)(srca >> 16);
129 uint32_t realb = (int16_t)srcb;
130 uint32_t imagb = (int16_t)(srcb >> 16);
131 uint32_t reald = srcd;
132 uint32_t imagd = srcd >> 32;
133 uint32_t realr = reala * realb - imaga * imagb + reald;
134 uint32_t imagr = reala * imagb + imaga * realb + imagd;
135
136 return deposit64(realr, 32, 32, imagr);
137 }
138
139 uint64_t helper_cmulaf(uint64_t srcd, uint64_t srca, uint64_t srcb)
140 {
141 uint32_t reala = (int16_t)srca;
142 uint32_t imaga = (int16_t)(srca >> 16);
143 uint32_t realb = (int16_t)srcb;
144 uint32_t imagb = (int16_t)(srcb >> 16);
145 uint32_t reald = (int16_t)srcd;
146 uint32_t imagd = (int16_t)(srcd >> 16);
147 int32_t realr = reala * realb - imaga * imagb;
148 int32_t imagr = reala * imagb + imaga * realb;
149
150 return deposit32((realr >> 15) + reald, 16, 16, (imagr >> 15) + imagd);
151 }
152
153 uint64_t helper_cmul2(uint64_t srca, uint64_t srcb, int shift, int round)
154 {
155 uint32_t reala = (int16_t)srca;
156 uint32_t imaga = (int16_t)(srca >> 16);
157 uint32_t realb = (int16_t)srcb;
158 uint32_t imagb = (int16_t)(srcb >> 16);
159 int32_t realr = reala * realb - imaga * imagb + round;
160 int32_t imagr = reala * imagb + imaga * realb + round;
161
162 return deposit32(realr >> shift, 16, 16, imagr >> shift);
163 }