root / prex-0.9.0 / bsp / hal / ppc / arch / cpu.c @ 03e9c04a
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| 1 | 03e9c04a | Brad Neuman | /*-
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| 2 | * Copyright (c) 2009, Kohsuke Ohtani
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | * 1. Redistributions of source code must retain the above copyright
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| 9 | * notice, this list of conditions and the following disclaimer.
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer in the
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| 12 | * documentation and/or other materials provided with the distribution.
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| 13 | * 3. Neither the name of the author nor the names of any co-contributors
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| 14 | * may be used to endorse or promote products derived from this software
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| 15 | * without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 27 | * SUCH DAMAGE.
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| 28 | */
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| 29 | |||
| 30 | /*
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| 31 | * cpu.c - cpu dependent routines
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| 32 | */
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| 33 | |||
| 34 | #include <kernel.h> |
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| 35 | #include <cpu.h> |
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| 36 | #include <locore.h> |
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| 37 | #include <cpufunc.h> |
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| 38 | |||
| 39 | static int curspl = 15; |
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| 40 | |||
| 41 | int
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| 42 | splhigh(void)
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| 43 | {
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| 44 | int oldspl = curspl;
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| 45 | |||
| 46 | sploff(); |
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| 47 | curspl = 15;
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| 48 | return oldspl;
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| 49 | } |
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| 50 | |||
| 51 | int
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| 52 | spl0(void)
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| 53 | {
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| 54 | int oldspl = curspl;
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| 55 | |||
| 56 | curspl = 0;
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| 57 | splon(); |
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| 58 | return oldspl;
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| 59 | } |
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| 60 | |||
| 61 | void
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| 62 | splx(int s)
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| 63 | {
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| 64 | |||
| 65 | curspl = s; |
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| 66 | if (curspl == 0) |
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| 67 | splon(); |
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| 68 | else
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| 69 | sploff(); |
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| 70 | } |
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| 71 | |||
| 72 | |||
| 73 | int
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| 74 | copyin(const void *uaddr, void *kaddr, size_t len) |
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| 75 | {
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| 76 | |||
| 77 | if (user_area(uaddr) && user_area(uaddr + len)) {
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| 78 | memcpy(kaddr, uaddr, len); |
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| 79 | return 0; |
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| 80 | } |
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| 81 | return EFAULT;
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| 82 | } |
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| 83 | |||
| 84 | int
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| 85 | copyout(const void *kaddr, void *uaddr, size_t len) |
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| 86 | {
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| 87 | |||
| 88 | if (user_area(uaddr) && user_area(uaddr + len)) {
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| 89 | memcpy(uaddr, kaddr, len); |
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| 90 | return 0; |
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| 91 | } |
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| 92 | return EFAULT;
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| 93 | } |
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| 94 | |||
| 95 | int
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| 96 | copyinstr(const void *uaddr, void *kaddr, size_t len) |
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| 97 | {
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| 98 | |||
| 99 | if (user_area(uaddr) && user_area(uaddr + len)) {
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| 100 | strlcpy(kaddr, uaddr, len); |
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| 101 | return 0; |
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| 102 | } |
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| 103 | return EFAULT;
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| 104 | } |