Reduce stack usage for ISRs; minor fixes.

Don't back up all registers on isr handlers - they don't read/modify
    them.  This saves stack space.
extended_bios_data_area_s must be packed to match ebda spec.
Enable irqs on int 08 - follows old bochs bios code.
Fix bug in int 76 -- should clear disk_interrupt_flag not
    floppy_harddisk_info.
Make sure we alert in disk_ret on failure case.
int 18/19 entry points need to setup cld/%ds too.
asm in handle_1587 clobbers flags - note that in clobber list.

1 files changed, 5 insertions, 2 deletions

diff --git a/src/mouse.c b/src/mouse.c
index 62070da9..569488b7 100644
--- a/src/mouse.c
+++ b/src/mouse.c
@@ -8,6 +8,9 @@
 #include "biosvar.h" // struct bregs
 #include "util.h" // debug_enter
 
+#define DEBUGF1(fmt, args...) bprintf(0, fmt , ##args)
+#define DEBUGF(fmt, args...)
+
 static char panic_msg_keyb_buffer_full[] = "%s: keyboard input buffer full\n";
 
 static void
@@ -413,9 +416,9 @@ int74_function()
 
 // INT74h : PS/2 mouse hardware interrupt
 void VISIBLE16
-handle_74(struct bregs *regs)
+handle_74()
 {
-    //debug_isr(regs);
+    //debug_isr();
 
     irq_enable();
     int74_function();