Commit 549030db authored by Gu Yuchen's avatar Gu Yuchen Committed by guzitao
Browse files

sw64: implementing VDSO with generic code 

Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/IB73UR



--------------------------------

The vdso has been changed to a generic code implementation,
adapting to the GENERIC_GETTIMEOFDAY, HAVE_GENERIC_VDSO, and
ARCH_CLOCKSOURCE_INIT options.

Signed-off-by: default avatarGu Yuchen <guyuchen@wxiat.com>
Reviewed-by: default avatarHe Sheng <hesheng@wxiat.com>
Signed-off-by: default avatarGu Zitao <guzitao@wxiat.com>
parent f432f271

arch/sw_64/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ config SW64 
	select ACPI_REDUCED_HARDWARE_ONLY

	select ACPI_SYSTEM_POWER_STATES_SUPPORT	if ACPI

	select ARCH_ATOMIC

	select ARCH_CLOCKSOURCE_INIT

	select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI

	select ARCH_HAS_ELF_RANDOMIZE

	select ARCH_HAS_PHYS_TO_DMA
@@ -63,6 +64,7 @@ config SW64 
	select DMA_OPS if PCI

	select GENERIC_ARCH_TOPOLOGY

	select GENERIC_CLOCKEVENTS

	select GENERIC_GETTIMEOFDAY if HAVE_GENERIC_VDSO

	select GENERIC_IRQ_LEGACY

	select GENERIC_IRQ_MIGRATION if SMP

	select GENERIC_IRQ_PROBE
@@ -91,6 +93,7 @@ config SW64 
	select HAVE_FTRACE_MCOUNT_RECORD

	select HAVE_FUNCTION_GRAPH_TRACER

	select HAVE_FUNCTION_TRACER

	select HAVE_GENERIC_VDSO if MMU && 64BIT

	select HAVE_IDE

	select HAVE_KPROBES

	select HAVE_KPROBES_ON_FTRACE

arch/sw_64/Makefile

+4 −0
Original line number Diff line number Diff line
@@ -49,6 +49,10 @@ export LIBS_Y 


boot := arch/sw_64/boot



PHONY += vdso_install

vdso_install:

	$(Q)$(MAKE) $(build)=arch/sw64/kernel/vdso $@



#Default target when executing make with no arguments

all: $(boot)/vmlinux.bin.gz

arch/sw_64/include/asm/clocksource.h

0 → 100644
+7 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

#ifndef _ASM_CLOCKSOURCE_H

#define _ASM_CLOCKSOURCE_H



#include <asm/vdso/clocksource.h>



#endif

arch/sw_64/include/asm/vdso/clocksource.h

0 → 100644
+8 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

#ifndef __ASM_VDSOCLOCKSOURCE_H

#define __ASM_VDSOCLOCKSOURCE_H



#define VDSO_ARCH_CLOCKMODES	\

	VDSO_CLOCKMODE_ARCHTIMER



#endif

arch/sw_64/include/asm/vdso/gettimeofday.h

0 → 100644
+105 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

#ifndef __ASM_VDSO_GETTIMEOFDAY_H

#define __ASM_VDSO_GETTIMEOFDAY_H



#ifndef __ASSEMBLY__



#include <asm/barrier.h>

#include <asm/unistd.h>

#include <asm/csr.h>

#include <uapi/linux/time.h>

#include <asm/hmcall.h>

#include <linux/kernel.h>

#define VDSO_HAS_CLOCK_GETRES	1



static __always_inline

int gettimeofday_fallback(struct __kernel_old_timeval *_tv,

			  struct timezone *_tz)

{

	long retval;

	long error;

	asm volatile(

	"	mov		%2, $16\n"

	"	mov		%3, $17\n"

	"	ldi		$0, %4\n"

	"	sys_call	%5\n"

	"	mov		$0, %0\n"

	"	mov		$19, %1"

	: "=r"(retval), "=r"(error)

	: "r"(_tv), "r"(_tz), "i"(__NR_gettimeofday), "i"(HMC_callsys)

	: "$0", "$16", "$17", "$19");

	if (unlikely(error))

		return -retval;

	else

		return retval;

}



static __always_inline

long clock_gettime_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)

{

	long retval;

	long error;

	asm volatile(

	"	mov		%2, $16\n"

	"	mov		%3, $17\n"

	"	ldi		$0, %4\n"

	"	sys_call	%5\n"

	"	mov		$0, %0\n"

	"	mov		$19, %1"

	: "=r"(retval), "=r"(error)

	: "r"(_clkid), "r"(_ts), "i"(__NR_clock_gettime), "i"(HMC_callsys)

	: "$0", "$16", "$17", "$19");

	if (unlikely(error))

		return -retval;

	else

		return retval;

}



static __always_inline

int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)

{

	long retval;

	long error;

	asm volatile(

	"	mov		%2, $16\n"

	"	mov		%3, $17\n"

	"	ldi		$0, %4\n"

	"	sys_call	%5\n"

	"	mov		$0, %0\n"

	"	mov		$19, %1"

	: "=r"(retval), "=r"(error)

	: "r"(_clkid), "r"(_ts), "i"(__NR_clock_getres), "i"(HMC_callsys)

	: "$0", "$16", "$17", "$19");

	if (unlikely(error))

		return -retval;

	else

		return retval;

}



#if defined(CONFIG_SUBARCH_C3B)

static __always_inline u64 __arch_get_hw_counter(s32 clock_mode,

						 const struct vdso_data *vd)

{

	register unsigned long __r0 __asm__("$0");



	__asm__ __volatile__(

		"sys_call %1" : "=r"(__r0) : "i" (HMC_longtime));



	return __r0;

}

#elif defined(CONFIG_SUBARCH_C4)

static __always_inline u64 __arch_get_hw_counter(s32 clock_mode,

						 const struct vdso_data *vd)

{

	return sw64_read_csr(CSR_SHTCLOCK);

}

#endif



static __always_inline const struct vdso_data *__arch_get_vdso_data(void)

{

	return _vdso_data;

}



#endif /* !__ASSEMBLY__ */



#endif /* __ASM_VDSO_GETTIMEOFDAY_H */