/* SPDX-License-Identifier: GPL-2.0 */#ifndef __VDSO_DATAPAGE_H#define __VDSO_DATAPAGE_H #ifndef __ASSEMBLY__ #include <linux/compiler.h>#include <uapi/linux/time.h>#include <uapi/linux/types.h>#include <uapi/asm-generic/errno-base.h> #include <vdso/bits.h>#include <vdso/clocksource.h>#include <vdso/ktime.h>#include <vdso/limits.h>#include <vdso/math64.h>#include <vdso/processor.h>#include <vdso/time.h>#include <vdso/time32.h>#include <vdso/time64.h> #ifdef CONFIG_ARCH_HAS_VDSO_DATA#include <asm/vdso/data.h>#elsestruct arch_vdso_data {};#endif #define VDSO_BASES	(CLOCK_TAI + 1)#define VDSO_HRES	(BIT(CLOCK_REALTIME)		| \			 BIT(CLOCK_MONOTONIC)		| \			 BIT(CLOCK_BOOTTIME)		| \			 BIT(CLOCK_TAI))#define VDSO_COARSE	(BIT(CLOCK_REALTIME_COARSE)	| \			 BIT(CLOCK_MONOTONIC_COARSE))#define VDSO_RAW	(BIT(CLOCK_MONOTONIC_RAW)) #define CS_HRES_COARSE	0#define CS_RAW		1#define CS_BASES	(CS_RAW + 1) /** * struct vdso_timestamp - basetime per clock_id * @sec:	seconds * @nsec:	nanoseconds * * There is one vdso_timestamp object in vvar for each vDSO-accelerated * clock_id. For high-resolution clocks, this encodes the time * corresponding to vdso_data.cycle_last. For coarse clocks this encodes * the actual time. * * To be noticed that for highres clocks nsec is left-shifted by * vdso_data.cs[x].shift. */struct vdso_timestamp {	u64	sec;	u64	nsec;}; /** * struct vdso_data - vdso datapage representation * @seq:		timebase sequence counter * @clock_mode:		clock mode * @cycle_last:		timebase at clocksource init * @mask:		clocksource mask * @mult:		clocksource multiplier * @shift:		clocksource shift * @basetime[clock_id]:	basetime per clock_id * @offset[clock_id]:	time namespace offset per clock_id * @tz_minuteswest:	minutes west of Greenwich * @tz_dsttime:		type of DST correction * @hrtimer_res:	hrtimer resolution * @__unused:		unused * @arch_data:		architecture specific data (optional, defaults *			to an empty struct) * * vdso_data will be accessed by 64 bit and compat code at the same time * so we should be careful before modifying this structure. * * @basetime is used to store the base time for the system wide time getter * VVAR page. * * @offset is used by the special time namespace VVAR pages which are * installed instead of the real VVAR page. These namespace pages must set * @seq to 1 and @clock_mode to VDSO_CLOCKMODE_TIMENS to force the code into * the time namespace slow path. The namespace aware functions retrieve the * real system wide VVAR page, read host time and add the per clock offset. * For clocks which are not affected by time namespace adjustment the * offset must be zero. */struct vdso_data {	u32			seq; 	s32			clock_mode;	u64			cycle_last;	u64			mask;	u32			mult;	u32			shift; 	union {		struct vdso_timestamp	basetime[VDSO_BASES];		struct timens_offset	offset[VDSO_BASES];	}; 	s32			tz_minuteswest;	s32			tz_dsttime;	u32			hrtimer_res;	u32			__unused; 	struct arch_vdso_data	arch_data;}; /* * We use the hidden visibility to prevent the compiler from generating a GOT * relocation. Not only is going through a GOT useless (the entry couldn't and * must not be overridden by another library), it does not even work: the linker * cannot generate an absolute address to the data page. * * With the hidden visibility, the compiler simply generates a PC-relative * relocation, and this is what we need. */extern struct vdso_data _vdso_data[CS_BASES] __attribute__((visibility("hidden")));extern struct vdso_data _timens_data[CS_BASES] __attribute__((visibility("hidden"))); /* * The generic vDSO implementation requires that gettimeofday.h * provides: * - __arch_get_vdso_data(): to get the vdso datapage. * - __arch_get_hw_counter(): to get the hw counter based on the *   clock_mode. * - gettimeofday_fallback(): fallback for gettimeofday. * - clock_gettime_fallback(): fallback for clock_gettime. * - clock_getres_fallback(): fallback for clock_getres. */#ifdef ENABLE_COMPAT_VDSO#include <asm/vdso/compat_gettimeofday.h>#else#include <asm/vdso/gettimeofday.h>#endif /* ENABLE_COMPAT_VDSO */ #endif /* !__ASSEMBLY__ */ #endif /* __VDSO_DATAPAGE_H */