88 lines
2.4 KiB
C
88 lines
2.4 KiB
C
/*
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* Copyright (c) 2011-2014 Wind River Systems, Inc.
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* Copyright (c) 2015 Intel Corporation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @file Utilities to read/write the Model Specific Registers (MSRs)
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*/
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#include <zephyr.h>
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/**
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*
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* @brief Write to a model specific register (MSR)
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*
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* This function is used to write to an MSR.
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*
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* The definitions of the so-called "Architectural MSRs" are contained
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* in kernel_structs.h and have the format: IA32_XXX_MSR
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*
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* INTERNAL
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* 1) The 'wrmsr' instruction was introduced in the Pentium processor; executing
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* this instruction on an earlier IA-32 processor will result in an invalid
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* opcode exception.
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* 2) The 'wrmsr' uses the ECX, EDX, and EAX registers which matches the set of
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* volatile registers!
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*
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* @return N/A
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*/
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void _MsrWrite(unsigned int msr, uint64_t msr_data)
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{
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__asm__ volatile (
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"movl %[msr], %%ecx\n\t"
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"movl %[data_lo], %%eax\n\t"
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"movl %[data_hi], %%edx\n\t"
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"wrmsr"
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:
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: [msr] "m" (msr),
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[data_lo] "rm" ((uint32_t)(msr_data & 0xFFFFFFFF)),
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[data_hi] "rm" ((uint32_t)(msr_data >> 32))
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: "eax", "ecx", "edx");
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}
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/**
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*
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* @brief Read from a model specific register (MSR)
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*
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* This function is used to read from an MSR.
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*
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* The definitions of the so-called "Architectural MSRs" are contained
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* in kernel_structs.h and have the format: IA32_XXX_MSR
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*
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* INTERNAL
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* 1) The 'rdmsr' instruction was introduced in the Pentium processor; executing
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* this instruction on an earlier IA-32 processor will result in an invalid
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* opcode exception.
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* 2) The 'rdmsr' uses the ECX, EDX, and EAX registers which matches the set of
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* volatile registers!
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*
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* @return N/A
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*/
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uint64_t _MsrRead(unsigned int msr)
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{
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uint64_t ret;
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__asm__ volatile (
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"movl %[msr], %%ecx\n\t"
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"rdmsr"
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: "=A" (ret)
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: [msr] "rm" (msr)
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: "ecx");
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return ret;
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}
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