fix register clobbering in ps2 calls

2 files changed, 4 insertions, 4 deletions

diff --git a/int15ps2.h b/int15ps2.h
index 847435d..95bedf7 100644
--- a/int15ps2.h
+++ b/int15ps2.h
@@ -97,7 +97,7 @@ static ps2m_err ps2m_init(uint8_t packet_size);
 	"end:" \
 	__parm [bh] \
 	__value [ah] \
-	__modify [ax]
+	__modify [ax bx]
 
 static ps2m_err ps2m_reset(void);
 #pragma aux ps2m_reset = \
@@ -110,7 +110,7 @@ static ps2m_err ps2m_reset(void);
 	"dec ah" \
 	"end:" \
 	__value [ah] \
-	__modify [ax]
+	__modify [ax bx]
 
 static ps2m_err ps2m_get_device_id(uint8_t __far *device_id);
 #pragma aux ps2m_get_device_id = \
@@ -125,7 +125,7 @@ static ps2m_err ps2m_get_device_id(uint8_t __far *device_id);
 	"end:" \
 	__parm [es di] \
 	__value [ah] \
-	__modify [ax]
+	__modify [ax bx]
 
 static ps2m_err ps2m_set_resolution(uint8_t resolution);
 #pragma aux ps2m_set_resolution = \
diff --git a/vbox.h b/vbox.h
index d47c01a..e2eb0ec 100644
--- a/vbox.h
+++ b/vbox.h
@@ -60,7 +60,7 @@ static void vbox_send_request(uint16_t iobase, uint32_t addr);
 	"out dx, eax" \
 	"pop eax" \
 	__parm [dx] [bx ax] \
-	__modify [dx]
+	__modify []
 
 /** Finds the VirtualBox PCI device and reads the current IO base.
   * @returns 0 if the device was found. */