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* Copyright (c) 2008 Advanced Micro Devices, Inc.
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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* Neither the name of the Advanced Micro Devices, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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#include <sys/types.h>
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msrfd = open("/dev/cpu/0/msr", O_RDWR);
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ErrorF("Unable to open /dev/cpu/0/msr: %d\n", errno);
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GeodeReadMSR(unsigned long addr, unsigned long *lo, unsigned long *hi)
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ret = lseek(fd, (off_t) addr, SEEK_SET);
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ret = read(fd, (void *) data, sizeof(data));
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GeodeWriteMSR(unsigned long addr, unsigned long lo, unsigned long hi)
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if (lseek(fd, (off_t) addr, SEEK_SET) == -1)
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if (write(fd, (void *) data, 8) != 8)