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1da177e4 LT |
1 | /* |
2 | * Kevin D. Kissell, kevink@mips and Carsten Langgaard, carstenl@mips.com | |
3 | * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved. | |
4 | * | |
5 | * This program is free software; you can distribute it and/or modify it | |
6 | * under the terms of the GNU General Public License (Version 2) as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 | * for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along | |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
17 | * | |
18 | * Routines corresponding to Linux kernel FP context | |
19 | * manipulation primitives for the Algorithmics MIPS | |
20 | * FPU Emulator | |
21 | */ | |
22 | #include <linux/config.h> | |
23 | #include <linux/sched.h> | |
24 | #include <asm/processor.h> | |
25 | #include <asm/signal.h> | |
26 | #include <asm/uaccess.h> | |
27 | ||
28 | #include <asm/fpu_emulator.h> | |
29 | ||
30 | extern struct mips_fpu_emulator_private fpuemuprivate; | |
31 | ||
32 | #define SIGNALLING_NAN 0x7ff800007ff80000LL | |
33 | ||
34 | void fpu_emulator_init_fpu(void) | |
35 | { | |
36 | static int first = 1; | |
37 | int i; | |
38 | ||
39 | if (first) { | |
40 | first = 0; | |
41 | printk("Algorithmics/MIPS FPU Emulator v1.5\n"); | |
42 | } | |
43 | ||
44 | current->thread.fpu.soft.fcr31 = 0; | |
45 | for (i = 0; i < 32; i++) { | |
46 | current->thread.fpu.soft.fpr[i] = SIGNALLING_NAN; | |
47 | } | |
48 | } | |
49 | ||
50 | ||
51 | /* | |
52 | * Emulator context save/restore to/from a signal context | |
53 | * presumed to be on the user stack, and therefore accessed | |
54 | * with appropriate macros from uaccess.h | |
55 | */ | |
56 | ||
57 | int fpu_emulator_save_context(struct sigcontext *sc) | |
58 | { | |
59 | int i; | |
60 | int err = 0; | |
61 | ||
62 | for (i = 0; i < 32; i++) { | |
63 | err |= | |
64 | __put_user(current->thread.fpu.soft.fpr[i], | |
65 | &sc->sc_fpregs[i]); | |
66 | } | |
67 | err |= __put_user(current->thread.fpu.soft.fcr31, &sc->sc_fpc_csr); | |
68 | err |= __put_user(fpuemuprivate.eir, &sc->sc_fpc_eir); | |
69 | ||
70 | return err; | |
71 | } | |
72 | ||
73 | int fpu_emulator_restore_context(struct sigcontext *sc) | |
74 | { | |
75 | int i; | |
76 | int err = 0; | |
77 | ||
78 | for (i = 0; i < 32; i++) { | |
79 | err |= | |
80 | __get_user(current->thread.fpu.soft.fpr[i], | |
81 | &sc->sc_fpregs[i]); | |
82 | } | |
83 | err |= __get_user(current->thread.fpu.soft.fcr31, &sc->sc_fpc_csr); | |
84 | err |= __get_user(fpuemuprivate.eir, &sc->sc_fpc_eir); | |
85 | ||
86 | return err; | |
87 | } | |
88 | ||
89 | #ifdef CONFIG_MIPS64 | |
90 | /* | |
91 | * This is the o32 version | |
92 | */ | |
93 | ||
94 | int fpu_emulator_save_context32(struct sigcontext32 *sc) | |
95 | { | |
96 | int i; | |
97 | int err = 0; | |
98 | ||
99 | for (i = 0; i < 32; i+=2) { | |
100 | err |= | |
101 | __put_user(current->thread.fpu.soft.fpr[i], | |
102 | &sc->sc_fpregs[i]); | |
103 | } | |
104 | err |= __put_user(current->thread.fpu.soft.fcr31, &sc->sc_fpc_csr); | |
105 | err |= __put_user(fpuemuprivate.eir, &sc->sc_fpc_eir); | |
106 | ||
107 | return err; | |
108 | } | |
109 | ||
110 | int fpu_emulator_restore_context32(struct sigcontext32 *sc) | |
111 | { | |
112 | int i; | |
113 | int err = 0; | |
114 | ||
115 | for (i = 0; i < 32; i+=2) { | |
116 | err |= | |
117 | __get_user(current->thread.fpu.soft.fpr[i], | |
118 | &sc->sc_fpregs[i]); | |
119 | } | |
120 | err |= __get_user(current->thread.fpu.soft.fcr31, &sc->sc_fpc_csr); | |
121 | err |= __get_user(fpuemuprivate.eir, &sc->sc_fpc_eir); | |
122 | ||
123 | return err; | |
124 | } | |
125 | #endif |