vmsvga: don't process more than 1024 fifo commands at once
[qemu.git] / target-openrisc / int_helper.c
1 /*
2 * OpenRISC int helper routines
3 *
4 * Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
5 * Feng Gao <gf91597@gmail.com>
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include "qemu/osdep.h"
22 #include "cpu.h"
23 #include "exec/helper-proto.h"
24 #include "exception.h"
25 #include "qemu/host-utils.h"
26
27 target_ulong HELPER(ff1)(target_ulong x)
28 {
29 /*#ifdef TARGET_OPENRISC64
30 return x ? ctz64(x) + 1 : 0;
31 #else*/
32 return x ? ctz32(x) + 1 : 0;
33 /*#endif*/
34 }
35
36 target_ulong HELPER(fl1)(target_ulong x)
37 {
38 /* not used yet, open it when we need or64. */
39 /*#ifdef TARGET_OPENRISC64
40 return 64 - clz64(x);
41 #else*/
42 return 32 - clz32(x);
43 /*#endif*/
44 }
45
46 uint32_t HELPER(mul32)(CPUOpenRISCState *env,
47 uint32_t ra, uint32_t rb)
48 {
49 uint64_t result;
50 uint32_t high, cy;
51
52 OpenRISCCPU *cpu = openrisc_env_get_cpu(env);
53
54 result = (uint64_t)ra * rb;
55 /* regisiers in or32 is 32bit, so 32 is NOT a magic number.
56 or64 is not handled in this function, and not implement yet,
57 TARGET_LONG_BITS for or64 is 64, it will break this function,
58 so, we didn't use TARGET_LONG_BITS here. */
59 high = result >> 32;
60 cy = result >> (32 - 1);
61
62 if ((cy & 0x1) == 0x0) {
63 if (high == 0x0) {
64 return result;
65 }
66 }
67
68 if ((cy & 0x1) == 0x1) {
69 if (high == 0xffffffff) {
70 return result;
71 }
72 }
73
74 cpu->env.sr |= (SR_OV | SR_CY);
75 if (cpu->env.sr & SR_OVE) {
76 raise_exception(cpu, EXCP_RANGE);
77 }
78
79 return result;
80 }