aboutsummaryrefslogtreecommitdiff
path: root/arch/s390/include
diff options
context:
space:
mode:
authorMartin Schwidefsky <schwidefsky@de.ibm.com>2008-12-25 13:38:36 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-12-25 13:38:55 +0100
commitb020632e40c3ed5e8c0c066d022672907e8401cf (patch)
treed7f805bd27e8378436fbba7e7457afbd10c22ed8 /arch/s390/include
parentfc5243d98ac2575ad14a974b3c097e9ba874c03d (diff)
[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: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include')
-rw-r--r--arch/s390/include/asm/auxvec.h2
-rw-r--r--arch/s390/include/asm/elf.h16
-rw-r--r--arch/s390/include/asm/mmu.h1
-rw-r--r--arch/s390/include/asm/page.h2
-rw-r--r--arch/s390/include/asm/vdso.h39
5 files changed, 60 insertions, 0 deletions
diff --git a/arch/s390/include/asm/auxvec.h b/arch/s390/include/asm/auxvec.h
index 0d340720fd9..a1f153e8913 100644
--- a/arch/s390/include/asm/auxvec.h
+++ b/arch/s390/include/asm/auxvec.h
@@ -1,4 +1,6 @@
#ifndef __ASMS390_AUXVEC_H
#define __ASMS390_AUXVEC_H
+#define AT_SYSINFO_EHDR 33
+
#endif
diff --git a/arch/s390/include/asm/elf.h b/arch/s390/include/asm/elf.h
index 261785ab5b2..d480f39d65e 100644
--- a/arch/s390/include/asm/elf.h
+++ b/arch/s390/include/asm/elf.h
@@ -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
diff --git a/arch/s390/include/asm/mmu.h b/arch/s390/include/asm/mmu.h
index d2b4ff83147..3b59216e628 100644
--- a/arch/s390/include/asm/mmu.h
+++ b/arch/s390/include/asm/mmu.h
@@ -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 */
diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h
index 991ba939408..32e8f6aa438 100644
--- a/arch/s390/include/asm/page.h
+++ b/arch/s390/include/asm/page.h
@@ -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 */
diff --git a/arch/s390/include/asm/vdso.h b/arch/s390/include/asm/vdso.h
new file mode 100644
index 00000000000..a44f4fe16a3
--- /dev/null
+++ b/arch/s390/include/asm/vdso.h
@@ -0,0 +1,39 @@
+#ifndef __S390_VDSO_H__
+#define __S390_VDSO_H__
+
+#ifdef __KERNEL__
+
+/* Default link addresses for the vDSOs */
+#define VDSO32_LBASE 0
+#define VDSO64_LBASE 0
+
+#define VDSO_VERSION_STRING LINUX_2.6.26
+
+#ifndef __ASSEMBLY__
+
+/*
+ * Note about this structure:
+ *
+ * NEVER USE THIS IN USERSPACE CODE DIRECTLY. The layout of this
+ * structure is supposed to be known only to the function in the vdso
+ * itself and may change without notice.
+ */
+
+struct vdso_data {
+ __u64 tb_update_count; /* Timebase atomicity ctr 0x00 */
+ __u64 xtime_tod_stamp; /* TOD clock for xtime 0x08 */
+ __u64 xtime_clock_sec; /* Kernel time 0x10 */
+ __u64 xtime_clock_nsec; /* 0x18 */
+ __u64 wtom_clock_sec; /* Wall to monotonic clock 0x20 */
+ __u64 wtom_clock_nsec; /* 0x28 */
+ __u32 tz_minuteswest; /* Minutes west of Greenwich 0x30 */
+ __u32 tz_dsttime; /* Type of dst correction 0x34 */
+};
+
+extern struct vdso_data *vdso_data;
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* __KERNEL__ */
+
+#endif /* __S390_VDSO_H__ */