Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
86 lines
2.0 KiB
C
86 lines
2.0 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 __ASSEMBLER__
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#ifdef CONFIG_X86_64
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#include <asm/msr.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 void x86_fsbase_write_task(struct task_struct *task, unsigned long fsbase);
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extern void x86_gsbase_write_task(struct task_struct *task, unsigned long gsbase);
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/* Must be protected by X86_FEATURE_FSGSBASE check. */
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static __always_inline unsigned long rdfsbase(void)
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{
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unsigned long fsbase;
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asm volatile("rdfsbase %0" : "=r" (fsbase) :: "memory");
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return fsbase;
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}
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static __always_inline unsigned long rdgsbase(void)
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{
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unsigned long gsbase;
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asm volatile("rdgsbase %0" : "=r" (gsbase) :: "memory");
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return gsbase;
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}
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static __always_inline void wrfsbase(unsigned long fsbase)
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{
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asm volatile("wrfsbase %0" :: "r" (fsbase) : "memory");
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}
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static __always_inline void wrgsbase(unsigned long gsbase)
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{
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asm volatile("wrgsbase %0" :: "r" (gsbase) : "memory");
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}
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#include <asm/cpufeature.h>
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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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if (boot_cpu_has(X86_FEATURE_FSGSBASE))
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fsbase = rdfsbase();
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else
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rdmsrq(MSR_FS_BASE, fsbase);
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return fsbase;
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}
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static inline void x86_fsbase_write_cpu(unsigned long fsbase)
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{
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if (boot_cpu_has(X86_FEATURE_FSGSBASE))
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wrfsbase(fsbase);
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else
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wrmsrq(MSR_FS_BASE, fsbase);
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}
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extern unsigned long x86_gsbase_read_cpu_inactive(void);
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extern void x86_gsbase_write_cpu_inactive(unsigned long gsbase);
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extern unsigned long x86_fsgsbase_read_task(struct task_struct *task,
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unsigned short selector);
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#endif /* CONFIG_X86_64 */
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#endif /* __ASSEMBLER__ */
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#endif /* _ASM_FSGSBASE_H */
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