mirror of https://gitee.com/openkylin/linux.git
50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_FSGSBASE_H
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#define _ASM_FSGSBASE_H
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#ifndef __ASSEMBLY__
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#ifdef CONFIG_X86_64
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#include <asm/msr-index.h>
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/*
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* Read/write a task's FSBASE or GSBASE. This returns the value that
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* the FS/GS base would have (if the task were to be resumed). These
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* work on the current task or on a non-running (typically stopped
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* ptrace child) task.
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*/
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extern unsigned long x86_fsbase_read_task(struct task_struct *task);
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extern unsigned long x86_gsbase_read_task(struct task_struct *task);
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extern int x86_fsbase_write_task(struct task_struct *task, unsigned long fsbase);
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extern int x86_gsbase_write_task(struct task_struct *task, unsigned long gsbase);
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/* Helper functions for reading/writing FS/GS base */
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static inline unsigned long x86_fsbase_read_cpu(void)
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{
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unsigned long fsbase;
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rdmsrl(MSR_FS_BASE, fsbase);
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return fsbase;
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}
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static inline unsigned long x86_gsbase_read_cpu_inactive(void)
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{
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unsigned long gsbase;
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rdmsrl(MSR_KERNEL_GS_BASE, gsbase);
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return gsbase;
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}
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extern void x86_fsbase_write_cpu(unsigned long fsbase);
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extern void x86_gsbase_write_cpu_inactive(unsigned long gsbase);
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#endif /* CONFIG_X86_64 */
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_FSGSBASE_H */
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