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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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ec3a94188d
So: - use 'extern' consistently for APIs - fix weird header guard - clarify code comments - reorder APIs by type Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Chang S. Bae <chang.seok.bae@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Markus T Metzger <markus.t.metzger@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Shankar <ravi.v.shankar@intel.com> Cc: Rik van Riel <riel@surriel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Link: http://lkml.kernel.org/r/1537312139-5580-2-git-send-email-chang.seok.bae@intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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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