20e2fc4231
The arm vDSO library requires some adaptations to take advantage of the newly introduced generic vDSO library. Introduce the following changes: - Modification vdso.c to be compliant with the common vdso datapage - Use of lib/vdso for gettimeofday - Implementation of elf note Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_VDSO_VSYSCALL_H
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#define __ASM_VDSO_VSYSCALL_H
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#ifndef __ASSEMBLY__
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#include <linux/timekeeper_internal.h>
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#include <vdso/datapage.h>
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#include <asm/cacheflush.h>
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extern struct vdso_data *vdso_data;
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extern bool cntvct_ok;
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static __always_inline
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bool tk_is_cntvct(const struct timekeeper *tk)
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{
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if (!IS_ENABLED(CONFIG_ARM_ARCH_TIMER))
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return false;
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if (!tk->tkr_mono.clock->archdata.vdso_direct)
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return false;
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return true;
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}
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/*
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* Update the vDSO data page to keep in sync with kernel timekeeping.
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*/
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static __always_inline
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struct vdso_data *__arm_get_k_vdso_data(void)
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{
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return vdso_data;
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}
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#define __arch_get_k_vdso_data __arm_get_k_vdso_data
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static __always_inline
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int __arm_update_vdso_data(void)
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{
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return !cntvct_ok;
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}
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#define __arch_update_vdso_data __arm_update_vdso_data
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static __always_inline
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int __arm_get_clock_mode(struct timekeeper *tk)
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{
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u32 __tk_is_cntvct = tk_is_cntvct(tk);
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return __tk_is_cntvct;
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}
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#define __arch_get_clock_mode __arm_get_clock_mode
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static __always_inline
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int __arm_use_vsyscall(struct vdso_data *vdata)
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{
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return vdata[CS_HRES_COARSE].clock_mode;
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}
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#define __arch_use_vsyscall __arm_use_vsyscall
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static __always_inline
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void __arm_sync_vdso_data(struct vdso_data *vdata)
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{
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flush_dcache_page(virt_to_page(vdata));
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}
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#define __arch_sync_vdso_data __arm_sync_vdso_data
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/* The asm-generic header needs to be included after the definitions above */
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#include <asm-generic/vdso/vsyscall.h>
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#endif /* !__ASSEMBLY__ */
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#endif /* __ASM_VDSO_VSYSCALL_H */
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