A binutils of at least 2.23 is required
(2.22.x introduced RDSEED).
Signed-off-by: Matthew Weber <matthew.weber@xxxxxxxxxxxxxxxxxxx>
---
configure | 17 +++++++++++++++++
x86/vmx_tests.c | 6 ++++++
2 files changed, 23 insertions(+)
diff --git a/configure b/configure
index dd9d361..4912582 100755
--- a/configure
+++ b/configure
@@ -171,6 +171,23 @@ mkdir -p lib
ln -sf "$asm" lib/asm
+cat > rd_test.c <<EOF
+#include <stdint.h>
+int main() {
+ uint16_t seed=0;
+ unsigned char ok;
+ asm volatile ("rdseed %0; setc %1"
+ : "=r" (seed), "=qm" (ok));
+ return ok;
+}
+EOF
+if $cross_prefix$cc -o /dev/null rd_test.c &> /dev/null; then
+ echo "Checking for rdseed/rdrand... Yes."
+else
+ CFLAGS="${CFLAGS} -DNO_RDSEEDRAND"
+ echo "Checking for rdseed/rdrand... No."
+fi
+
# create the config
cat <<EOF > config.mak
SRCDIR=$srcdir
diff --git a/x86/vmx_tests.c b/x86/vmx_tests.c
index 4a3e94b..2cbe3eb 100644
--- a/x86/vmx_tests.c
+++ b/x86/vmx_tests.c
@@ -770,8 +770,10 @@ asm(
"insn_sldt: sldt %ax;ret\n\t"
"insn_lldt: xor %eax, %eax; lldt %ax;ret\n\t"
"insn_str: str %ax;ret\n\t"
+#ifndef NO_RDSEEDRAND
"insn_rdrand: rdrand %rax;ret\n\t"
"insn_rdseed: rdseed %rax;ret\n\t"
+#endif
);
extern void insn_hlt();
extern void insn_invlpg();
@@ -796,8 +798,10 @@ extern void insn_lldt();
extern void insn_str();
extern void insn_cpuid();
extern void insn_invd();
+#ifndef NO_RDSEEDRAND
extern void insn_rdrand();
extern void insn_rdseed();
+#endif
u32 cur_insn;
u64 cr3;
@@ -853,8 +857,10 @@ static struct insn_table insn_table[] = {
{"DESC_TABLE (LLDT)", CPU_DESC_TABLE, insn_lldt, INSN_CPU1, 47, 0, 0, 0},
{"DESC_TABLE (STR)", CPU_DESC_TABLE, insn_str, INSN_CPU1, 47, 0, 0, 0},
/* LTR causes a #GP if done with a busy selector, so it is not tested. */
+#ifndef NO_RDSEEDRAND
{"RDRAND", CPU_RDRAND, insn_rdrand, INSN_CPU1, VMX_RDRAND, 0, 0, 0},
{"RDSEED", CPU_RDSEED, insn_rdseed, INSN_CPU1, VMX_RDSEED, 0, 0, 0},
+#endif
// Instructions always trap
{"CPUID", 0, insn_cpuid, INSN_ALWAYS_TRAP, 10, 0, 0, 0},
{"INVD", 0, insn_invd, INSN_ALWAYS_TRAP, 13, 0, 0, 0},
--
1.9.1
