Commit b020632e authored by Martin Schwidefsky's avatar Martin Schwidefsky
Browse files

[S390] introduce vdso on s390 



Add a vdso to speed up gettimeofday and clock_getres/clock_gettime for
CLOCK_REALTIME/CLOCK_MONOTONIC.

Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent fc5243d9

arch/s390/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -43,6 +43,9 @@ config GENERIC_HWEIGHT 
config GENERIC_TIME

	def_bool y



config GENERIC_TIME_VSYSCALL

	def_bool y



config GENERIC_CLOCKEVENTS

	def_bool y

arch/s390/include/asm/auxvec.h

+2 −0
Original line number Diff line number Diff line 
#ifndef __ASMS390_AUXVEC_H

#define __ASMS390_AUXVEC_H



#define AT_SYSINFO_EHDR		33



#endif

arch/s390/include/asm/elf.h

+16 −0
Original line number Diff line number Diff line
@@ -120,6 +120,10 @@ typedef s390_compat_regs compat_elf_gregset_t; 
#include <asm/system.h>		/* for save_access_regs */

#include <asm/mmu_context.h>



#include <asm/vdso.h>



extern unsigned int vdso_enabled;



/*

 * This is used to ensure we don't load something for the wrong architecture.

 */
@@ -191,4 +195,16 @@ do { \ 
	current->mm->context.noexec == 0;		\

})



#define ARCH_DLINFO							    \

do {									    \

	if (vdso_enabled)						    \

		NEW_AUX_ENT(AT_SYSINFO_EHDR,				    \

			    (unsigned long)current->mm->context.vdso_base); \

} while (0)



struct linux_binprm;



#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1

int arch_setup_additional_pages(struct linux_binprm *, int);



#endif

arch/s390/include/asm/mmu.h

+1 −0
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ typedef struct { 
	struct list_head pgtable_list;

	unsigned long asce_bits;

	unsigned long asce_limit;

	unsigned long vdso_base;

	int noexec;

	int has_pgste;	 /* The mmu context has extended page tables */

	int alloc_pgste; /* cloned contexts will have extended page tables */

arch/s390/include/asm/page.h

+2 −0
Original line number Diff line number Diff line
@@ -152,4 +152,6 @@ void arch_alloc_page(struct page *page, int order); 
#include <asm-generic/memory_model.h>

#include <asm-generic/page.h>



#define __HAVE_ARCH_GATE_AREA 1



#endif /* _S390_PAGE_H */