arch/sparc/include/asm/vdso/gettimeofday.h

Source file repositories/reference/linux-study-clean/arch/sparc/include/asm/vdso/gettimeofday.h

File Facts

System
Linux kernel
Corpus path
arch/sparc/include/asm/vdso/gettimeofday.h
Extension
.h
Size
4725 bytes
Lines
185
Domain
Architecture Layer
Bucket
arch/sparc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _ASM_SPARC_VDSO_GETTIMEOFDAY_H
#define _ASM_SPARC_VDSO_GETTIMEOFDAY_H

#include <uapi/linux/time.h>
#include <uapi/linux/unistd.h>

#include <vdso/align.h>
#include <vdso/clocksource.h>
#include <vdso/datapage.h>
#include <vdso/page.h>

#include <linux/types.h>

#ifdef	CONFIG_SPARC64
static __always_inline u64 vread_tick(void)
{
	u64	ret;

	__asm__ __volatile__("rd %%tick, %0" : "=r" (ret));
	return ret;
}

static __always_inline u64 vread_tick_stick(void)
{
	u64	ret;

	__asm__ __volatile__("rd %%asr24, %0" : "=r" (ret));
	return ret;
}
#else
static __always_inline u64 vdso_shift_ns(u64 val, u32 amt)
{
	u64 ret;

	__asm__ __volatile__("sllx %H1, 32, %%g1\n\t"
			     "srl %L1, 0, %L1\n\t"
			     "or %%g1, %L1, %%g1\n\t"
			     "srlx %%g1, %2, %L0\n\t"
			     "srlx %L0, 32, %H0"
			     : "=r" (ret)
			     : "r" (val), "r" (amt)
			     : "g1");
	return ret;
}
#define vdso_shift_ns vdso_shift_ns

static __always_inline u64 vread_tick(void)
{
	register unsigned long long ret asm("o4");

	__asm__ __volatile__("rd %%tick, %L0\n\t"
			     "srlx %L0, 32, %H0"
			     : "=r" (ret));
	return ret;
}

static __always_inline u64 vread_tick_stick(void)
{
	register unsigned long long ret asm("o4");

	__asm__ __volatile__("rd %%asr24, %L0\n\t"
			     "srlx %L0, 32, %H0"
			     : "=r" (ret));
	return ret;
}
#endif

static __always_inline u64 __arch_get_hw_counter(s32 clock_mode, const struct vdso_time_data *vd)
{
	if (likely(clock_mode == VDSO_CLOCKMODE_STICK))
		return vread_tick_stick();
	else
		return vread_tick();
}

#ifdef	CONFIG_SPARC64
#define SYSCALL_STRING							\
	"ta	0x6d;"							\
	"bcs,a	1f;"							\
	" sub	%%g0, %%o0, %%o0;"					\
	"1:"
#else
#define SYSCALL_STRING							\
	"ta	0x10;"							\
	"bcs,a	1f;"							\
	" sub	%%g0, %%o0, %%o0;"					\
	"1:"
#endif

#define SYSCALL_CLOBBERS						\

Annotation

Implementation Notes