Initial import of qemu-2.4.1HEADmaster

1 files changed, 16 insertions, 0 deletions

diff --git a/roms/ipxe/src/arch/i386/interface/pcbios/bios_nap.c b/roms/ipxe/src/arch/i386/interface/pcbios/bios_nap.c
new file mode 100644
index 00000000..1e7de756
--- /dev/null
+++ b/roms/ipxe/src/arch/i386/interface/pcbios/bios_nap.c
@@ -0,0 +1,16 @@
+#include <ipxe/nap.h>
+#include <realmode.h>
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+/**
+ * Save power by halting the CPU until the next interrupt
+ *
+ */
+static void bios_cpu_nap ( void ) {
+	__asm__ __volatile__ ( "sti\n\t"
+			       "hlt\n\t"
+			       "cli\n\t" );
+}
+
+PROVIDE_NAP ( pcbios, cpu_nap, bios_cpu_nap );