From a77fd1e7f5e7f5091d21c94bb48795dd048658e2 Mon Sep 17 00:00:00 2001
From: SarahW <pcem@pcem-emulator.co.uk>
Date: Sun, 9 Feb 2020 17:55:28 +0000
Subject: [PATCH] 8087 FNINIT initialises control word to 0x3ff. Fixes FPU
 detection on Xi8088.

---
 src/x87_ops_misc.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/x87_ops_misc.h b/src/x87_ops_misc.h
index 3a572cc..b2f7d32 100644
--- a/src/x87_ops_misc.h
+++ b/src/x87_ops_misc.h
@@ -58,7 +58,10 @@ static int opFINIT(uint32_t fetchdat)
 {
         FP_ENTER();
         cpu_state.pc++;
-        cpu_state.npxc = 0x37F;
+        if (fpu_type == FPU_8087)
+                cpu_state.npxc = 0x3ff;
+        else
+                cpu_state.npxc = 0x37f;
         codegen_set_rounding_mode(X87_ROUNDING_NEAREST);
         cpu_state.npxs = 0;
         *(uint64_t *)cpu_state.tag = 0;