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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 5564 | serge | 1 | /************************************************************************** |
| 2 | * |
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| 3 | * Copyright 2008-2010 VMware, Inc. |
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| 4 | * All Rights Reserved. |
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| 5 | * |
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| 6 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 7 | * copy of this software and associated documentation files (the |
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| 8 | * "Software"), to deal in the Software without restriction, including |
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| 9 | * without limitation the rights to use, copy, modify, merge, publish, |
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| 10 | * distribute, sub license, and/or sell copies of the Software, and to |
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| 11 | * permit persons to whom the Software is furnished to do so, subject to |
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| 12 | * the following conditions: |
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| 13 | * |
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| 14 | * The above copyright notice and this permission notice (including the |
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| 15 | * next paragraph) shall be included in all copies or substantial portions |
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| 16 | * of the Software. |
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| 17 | * |
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| 18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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| 19 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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| 20 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. |
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| 21 | * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR |
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| 22 | * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
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| 23 | * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
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| 24 | * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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| 25 | * |
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| 26 | **************************************************************************/ |
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| 27 | |||
| 28 | |||
| 29 | /* |
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| 30 | * Memory alignment wrappers. |
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| 31 | */ |
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| 32 | |||
| 33 | |||
| 34 | #ifndef _OS_MEMORY_H_ |
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| 35 | #error "Must not be included directly. Include os_memory.h instead" |
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| 36 | #endif |
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| 37 | |||
| 38 | |||
| 39 | #include "pipe/p_compiler.h" |
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| 40 | |||
| 41 | |||
| 42 | |||
| 43 | /** |
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| 44 | * Add two size_t values with integer overflow check. |
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| 45 | * TODO: leverage __builtin_add_overflow where available |
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| 46 | */ |
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| 47 | static inline bool |
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| 48 | add_overflow_size_t(size_t a, size_t b, size_t *res) |
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| 49 | { |
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| 50 | *res = a + b; |
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| 51 | return *res < a || *res < b; |
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| 52 | } |
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| 53 | |||
| 54 | |||
| 55 | /** |
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| 56 | * Return memory on given byte alignment |
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| 57 | */ |
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| 58 | static INLINE void * |
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| 59 | os_malloc_aligned(size_t size, size_t alignment) |
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| 60 | { |
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| 61 | char *ptr, *buf; |
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| 62 | size_t alloc_size; |
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| 63 | |||
| 64 | /* |
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| 65 | * Calculate |
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| 66 | * |
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| 67 | * alloc_size = size + alignment + sizeof(void *) |
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| 68 | * |
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| 69 | * while checking for overflow. |
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| 70 | */ |
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| 71 | if (add_overflow_size_t(size, alignment, &alloc_size) || |
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| 72 | add_overflow_size_t(alloc_size, sizeof(void *), &alloc_size)) { |
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| 73 | return NULL; |
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| 74 | } |
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| 75 | |||
| 76 | ptr = (char *) os_malloc(alloc_size); |
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| 77 | if (!ptr) |
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| 78 | return NULL; |
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| 79 | |||
| 80 | buf = (char *)(((uintptr_t)ptr + sizeof(void *) + alignment - 1) & ~((uintptr_t)(alignment - 1))); |
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| 81 | *(char **)(buf - sizeof(void *)) = ptr; |
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| 82 | |||
| 83 | return buf; |
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| 84 | } |
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| 85 | |||
| 86 | |||
| 87 | /** |
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| 88 | * Free memory returned by align_malloc(). |
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| 89 | */ |
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| 90 | static INLINE void |
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| 91 | os_free_aligned(void *ptr) |
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| 92 | { |
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| 93 | if (ptr) { |
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| 94 | void **cubbyHole = (void **) ((char *) ptr - sizeof(void *)); |
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| 95 | void *realAddr = *cubbyHole; |
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| 96 | os_free(realAddr); |
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| 97 | } |
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| 98 | } |