low-level keyboard input (not hooked up to /dev yet)

fix acquire() to cli() *before* incrementing nlock
make T_SYSCALL a trap gate, not an interrupt gate
sadly, various crashes if you hold down a keyboard key...

1 files changed, 13 insertions, 3 deletions

diff --git a/trap.c b/trap.c
index 7031223..b172a77 100644
--- a/trap.c
+++ b/trap.c
@@ -21,7 +21,7 @@ tvinit(void)
   for(i = 0; i < 256; i++){
     SETGATE(idt[i], 1, SEG_KCODE << 3, vectors[i], 0);
   }
-  SETGATE(idt[T_SYSCALL], T_SYSCALL, SEG_KCODE << 3, vectors[48], 3);
+  SETGATE(idt[T_SYSCALL], 1, SEG_KCODE << 3, vectors[48], 3);
 }
 
 void
@@ -40,12 +40,12 @@ trap(struct trapframe *tf)
             v, tf->eip, cpu(), cpus[cpu()].nlock);
     panic("interrupt while holding a lock");
   }
-  if((read_eflags() & FL_IF) == 0)
-    panic("interrupt but interrupts now disabled");
 
   if(v == T_SYSCALL){
     struct proc *cp = curproc[cpu()];
     int num = cp->tf->eax;
+    if((read_eflags() & FL_IF) == 0)
+      panic("syscall but interrupts now disabled");
     if(cp == 0)
       panic("syscall with no proc");
     if(cp->killed)
@@ -73,6 +73,9 @@ trap(struct trapframe *tf)
     return;
   }
 
+  //if(read_eflags() & FL_IF)
+  //panic("interrupt but interrupts enabled");
+
   if(v == (IRQ_OFFSET + IRQ_TIMER)){
     struct proc *cp = curproc[cpu()];
     lapic_timerintr();
@@ -97,5 +100,12 @@ trap(struct trapframe *tf)
     return;
   }
 
+  if(v == (IRQ_OFFSET + IRQ_KBD)){
+    kbd_intr();
+    return;
+  }
+
+  cprintf("trap %d\n", v);
+
   return;
 }