Chloe M.
57 lines
1.0 KiB
C
57 lines
1.0 KiB
C
/*
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* Copyright (c) 2026, Chloe M.
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* Provided under the BSD-3 clause.
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*
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* Description: Model specific register helpers
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* Author: Chloe M.
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*/
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#ifndef _MACHINE_MSR_H_
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#define _MACHINE_MSR_H_ 1
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#ifndef __ASSEMBLER__
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#include <stdef.h>
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#endif /* !__ASSEMBLER__ */
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#define IA32_SPEC_CTL 0x00000048
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#define IA32_KERNEL_GS_BASE 0xC0000102
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#define IA32_GS_BASE 0xC0000101
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#define IA32_FS_BASE 0xC0000100
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#define IA32_APIC_BASE_MSR 0x0000001B
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#ifndef __ASSEMBLER__
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ALWAYS_INLINE static inline UQUAD
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MdRdmsr(ULONG Address)
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{
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ULONG Low, High;
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ASMV(
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"rdmsr"
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: "=a" (Low), "=d" (High)
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: "c" (Address)
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: "memory"
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);
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return ((UQUAD)High << 32) | Low;
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}
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ALWAYS_INLINE static inline VOID
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MdWrmsr(ULONG Address, UQUAD Value)
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{
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ULONG Low, High;
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Low = Value & 0xFFFFFFFF;
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High = (Value >> 32) & 0xFFFFFFFF;
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ASMV(
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"wrmsr"
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:
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: "a" (Low), "d" (High),
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"c" (Address)
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: "memory"
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);
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}
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#endif /* !__ASSEMBLER__ */
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#endif /* !_MACHINE_MSR_H_ */
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