[Xen-changelog] [xen-unstable] minios: setup fpu and sse in mini-os

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Matthew Fioravante <matthew.fioravante@xxxxxxxxxx>
# Date 1349703391 -3600
# Node ID c9f621893a05e3e447ba6770f8ae912721712569
# Parent  865626fc700457613e9049d9c19bf25b43bfa019
minios: setup fpu and sse in mini-os

This patch adds floating point and sse support to mini-os by
initializing the floating point unit and the see unit during
domain boot up.

Signed-off-by: Matthew Fioravante <matthew.fioravante@xxxxxxxxxx>
Acked-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxxx>
Committed-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---


diff -r 865626fc7004 -r c9f621893a05 extras/mini-os/arch/x86/setup.c
--- a/extras/mini-os/arch/x86/setup.c   Mon Oct 08 14:36:31 2012 +0100
+++ b/extras/mini-os/arch/x86/setup.c   Mon Oct 08 14:36:31 2012 +0100
@@ -74,9 +74,28 @@ shared_info_t *map_shared_info(unsigned 
        return (shared_info_t *)shared_info;
 }
 
+static inline void fpu_init(void) {
+       asm volatile("fninit");
+}
+
+#ifdef __SSE__
+static inline void sse_init(void) {
+       unsigned long status = 0x1f80;
+       asm volatile("ldmxcsr %0" : : "m" (status));
+}
+#else
+#define sse_init()
+#endif
+
 void
 arch_init(start_info_t *si)
 {
+       /*Initialize floating point unit */
+        fpu_init();
+
+        /* Initialize SSE */
+        sse_init();
+
        /* Copy the start_info struct to a globally-accessible area. */
        /* WARN: don't do printk before here, it uses information from
           shared_info. Use xprintk instead. */
@@ -99,6 +118,7 @@ arch_init(start_info_t *si)
                (unsigned long)failsafe_callback, 0);
 #endif
 
+
 }
 
 void

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