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diff --git a/sys/amd64/linux/linux_sysvec.c b/sys/amd64/linux/linux_sysvec.c
--- a/sys/amd64/linux/linux_sysvec.c
+++ b/sys/amd64/linux/linux_sysvec.c
@@ -233,7 +233,7 @@
AUXARGS_ENTRY((*pos), LINUX_AT_SYSINFO_EHDR, linux_vdso_base);
AUXARGS_ENTRY((*pos), LINUX_AT_HWCAP, cpu_feature);
- AUXARGS_ENTRY((*pos), LINUX_AT_HWCAP2, 0);
+ AUXARGS_ENTRY((*pos), LINUX_AT_HWCAP2, linux_x86_elf_hwcap2());
AUXARGS_ENTRY((*pos), LINUX_AT_PLATFORM, PTROUT(linux_platform));
}
diff --git a/sys/amd64/linux32/linux32_sysvec.c b/sys/amd64/linux32/linux32_sysvec.c
--- a/sys/amd64/linux32/linux32_sysvec.c
+++ b/sys/amd64/linux32/linux32_sysvec.c
@@ -146,7 +146,7 @@
AUXARGS_ENTRY((*pos), LINUX_AT_SYSINFO, __kernel_vsyscall);
AUXARGS_ENTRY((*pos), LINUX_AT_SYSINFO_EHDR, linux_vdso_base);
AUXARGS_ENTRY((*pos), LINUX_AT_HWCAP, cpu_feature);
- AUXARGS_ENTRY((*pos), LINUX_AT_HWCAP2, 0);
+ AUXARGS_ENTRY((*pos), LINUX_AT_HWCAP2, linux_x86_elf_hwcap2());
AUXARGS_ENTRY((*pos), LINUX_AT_PLATFORM, PTROUT(linux_platform));
}
diff --git a/sys/i386/linux/linux.h b/sys/i386/linux/linux.h
--- a/sys/i386/linux/linux.h
+++ b/sys/i386/linux/linux.h
@@ -94,7 +94,7 @@
/*
* Miscellaneous
*/
-#define LINUX_AT_COUNT 21 /* Count of used aux entry types.
+#define LINUX_AT_COUNT 22 /* Count of used aux entry types.
* Keep this synchronized with
* linux_copyout_auxargs() code.
*/
diff --git a/sys/i386/linux/linux_sysvec.c b/sys/i386/linux/linux_sysvec.c
--- a/sys/i386/linux/linux_sysvec.c
+++ b/sys/i386/linux/linux_sysvec.c
@@ -145,6 +145,7 @@
AUXARGS_ENTRY((*pos), LINUX_AT_SYSINFO_EHDR, linux_vdso_base);
AUXARGS_ENTRY((*pos), LINUX_AT_SYSINFO, __kernel_vsyscall);
AUXARGS_ENTRY((*pos), LINUX_AT_HWCAP, cpu_feature);
+ AUXARGS_ENTRY((*pos), LINUX_AT_HWCAP2, linux_x86_elf_hwcap2());
AUXARGS_ENTRY((*pos), LINUX_AT_PLATFORM, PTROUT(linux_platform));
}
diff --git a/sys/x86/linux/linux_x86.h b/sys/x86/linux/linux_x86.h
--- a/sys/x86/linux/linux_x86.h
+++ b/sys/x86/linux/linux_x86.h
@@ -32,10 +32,16 @@
#define LINUX_VDSO_CPU_RDPID 1
#define LINUX_VDSO_CPU_RDTSCP 2
+/* More machine dependent hints about processor capabilities. */
+#define LINUX_HWCAP2_RING3MWAIT 0x00000001
+#define LINUX_HWCAP2_FSGSBASE 0x00000002
+
int linux_vdso_tsc_selector_idx(void);
int linux_vdso_cpu_selector_idx(void);
int linux_translate_traps(int, int);
int bsd_to_linux_trapcode(int);
+u_int linux_x86_elf_hwcap2(void);
+
#endif /* _X86_INCLUDE_LINUX_LINUX_X86_H_ */
diff --git a/sys/x86/linux/linux_x86.c b/sys/x86/linux/linux_x86.c
--- a/sys/x86/linux/linux_x86.c
+++ b/sys/x86/linux/linux_x86.c
@@ -31,7 +31,9 @@
#include <sys/param.h>
#include <sys/signal.h>
+#include <x86/specialreg.h>
#include <x86/trap.h>
+#include <x86/x86_var.h>
#include <x86/linux/linux_x86.h>
@@ -96,4 +98,18 @@
return (code < nitems(_bsd_to_linux_trapcode) ?
_bsd_to_linux_trapcode[code] : LINUX_T_UNKNOWN);
-}
\ No newline at end of file
+}
+
+u_int
+linux_x86_elf_hwcap2(void)
+{
+ static u_int elf_hwcap2 = 0;
+ static bool elf_hwcap2_valid = false;
+
+ if (!elf_hwcap2_valid) {
+ if ((cpu_stdext_feature & CPUID_STDEXT_FSGSBASE) != 0)
+ elf_hwcap2 |= LINUX_HWCAP2_FSGSBASE;
+ elf_hwcap2_valid = true;
+ }
+ return (elf_hwcap2);
+}

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