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https://gitea.wildfiregames.com/0ad/0ad
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64 lines
2.3 KiB
C++
64 lines
2.3 KiB
C++
/* Copyright (c) 2012 Wildfire Games
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* routines specific to ARM
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*/
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#include "precompiled.h"
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#include "lib/sysdep/cpu.h"
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#include <android/log.h>
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intptr_t cpu_AtomicAdd(volatile intptr_t* location, intptr_t increment)
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{
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return __sync_fetch_and_add(location, increment);
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}
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bool cpu_CAS(volatile intptr_t* location, intptr_t expected, intptr_t newValue)
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{
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return __sync_bool_compare_and_swap(location, expected, newValue);
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}
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bool cpu_CAS64(volatile i64* location, i64 expected, i64 newValue)
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{
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// Current versions of GCC don't implement this on ARM:
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// return __sync_bool_compare_and_swap(location, expected, newValue);
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// http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=40fb79c8a88625504857d44de1bc89dc0341e618
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// adds support for
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// return __kernel_cmpxchg64(&expected, &newValue, (long long*)location) == 0;
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// but only for Linux kernel 3.1
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// Maybe we can do it with user-space assembly assuming a modern-enough CPU?
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// That sounds non-trivial so let's just cheat
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#warning TODO: atomic cpu_CAS64 on ARM
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if (*location != expected)
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return false;
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*location = newValue;
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return true;
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}
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const char* cpu_IdentifierString()
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{
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return "unknown"; // TODO
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}
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