169 lines
4.1 KiB
C
169 lines
4.1 KiB
C
/*
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* Copyright (c) 2008 Advanced Micro Devices, Inc.
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*
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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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*
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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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*
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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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*
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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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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <errno.h>
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#ifdef __OpenBSD__
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#include <sys/ioctl.h>
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#include <machine/amdmsr.h>
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#endif
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#ifdef __FreeBSD__
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#include <sys/ioctl.h>
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#include <sys/cpuctl.h>
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#endif
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#include "os.h"
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#include "geode.h"
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#ifdef __OpenBSD__
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#define _PATH_MSRDEV "/dev/amdmsr"
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#define X_PRIVSEP
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#elif defined __FreeBSD__
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#define _PATH_MSRDEV "/dev/cpuctl0"
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#else
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#define _PATH_MSRDEV "/dev/cpu/0/msr"
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#endif
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static int
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_msr_open(void)
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{
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static int msrfd = 0;
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if (msrfd == 0) {
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#ifdef X_PRIVSEP
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msrfd = priv_open_device(_PATH_MSRDEV);
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#else
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msrfd = open(_PATH_MSRDEV, O_RDWR);
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#endif
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if (msrfd == -1)
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FatalError("Unable to open %s: %s\n", _PATH_MSRDEV,
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strerror(errno));
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}
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return msrfd;
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}
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int
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GeodeReadMSR(unsigned long addr, unsigned long *lo, unsigned long *hi)
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{
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#ifdef __OpenBSD__
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struct amdmsr_req req;
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int fd = _msr_open();
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req.addr = addr;
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if (ioctl(fd, RDMSR, &req) == -1)
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FatalError("Unable to read MSR at address %0x06x: %s\n", addr,
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strerror(errno));
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*hi = req.val >> 32;
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*lo = req.val & 0xffffffff;
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#elif defined __FreeBSD__
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cpuctl_msr_args_t args;
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int fd = _msr_open();
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args.msr = addr;
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if (ioctl(fd, CPUCTL_RDMSR, &args) == -1)
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FatalError("Unable to read MSR at address %0x06x: %s\n", addr,
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strerror(errno));
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*hi = args.data >> 32;
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*lo = args.data & 0xffffffff;
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#else
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unsigned int data[2];
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int fd = _msr_open();
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int ret;
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if (fd == -1)
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return -1;
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ret = lseek(fd, (off_t) addr, SEEK_SET);
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if (ret == -1)
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return -1;
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ret = read(fd, (void *) data, sizeof(data));
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if (ret != 8)
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return -1;
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*hi = data[1];
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*lo = data[0];
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#endif
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return 0;
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}
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int
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GeodeWriteMSR(unsigned long addr, unsigned long lo, unsigned long hi)
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{
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#ifdef __OpenBSD__
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struct amdmsr_req req;
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int fd = _msr_open();
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req.addr = addr;
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req.val = (u_int64_t) hi << 32 | (u_int64_t)lo;
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if (ioctl(fd, WRMSR, &req) == -1)
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FatalError("Unable to write MSR at address 0x%06x: %s\n", addr,
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strerror(errno));
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#elif defined __FreeBSD__
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cpuctl_msr_args_t args;
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int fd = _msr_open();
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args.msr = addr;
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args.data = (u_int64_t) hi << 32 | (u_int64_t)lo;
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if (ioctl(fd, CPUCTL_WRMSR, &args) == -1)
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FatalError("Unable to write MSR at address 0x%06x: %s\n", addr,
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strerror(errno));
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#else
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unsigned int data[2];
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int fd = _msr_open();
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if (fd == -1)
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return -1;
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if (lseek(fd, (off_t) addr, SEEK_SET) == -1)
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return -1;
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data[0] = lo;
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data[1] = hi;
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if (write(fd, (void *) data, 8) != 8)
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return -1;
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#endif
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return 0;
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}
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