3 files changed, 25 insertions(+), 10 deletions(-)

M pc/l.s
M port/dev.c
M port/sturp.c

@@ 1,25 1,39 @@
 #include "mem.h"
 
+/*
+ *  pointer to initial gdt (must be in first 64K of program)
+ */
 GLOBL	gdtptr(SB),$6
 
-	DATA	gdtptr+0(SB)/2, $(6*8)
+	DATA	gdtptr+0(SB)/2, $(5*8)
 	DATA	gdtptr+2(SB)/4, $gdt(SB)
 
 /*
+ *  pointer to idt (must be in first 64K of program)
+ */
+GLOBL	idtptr(SB),$6
+
+	DATA	idtptr+0(SB)/2, $(6*8)
+	DATA	idtptr+2(SB)/4, $idt(SB)
+
+/*
  *  boot processor
  */
 TEXT	start(SB),$0
 
 	CLI			/* disable interrupts */
-	MOVW	$NULLSEL,IDTR	/* force shutdown on error */
+
+	/* point CPU at the interrupt/trap table */
+	LEAL	idtptr(SB),AX
+/*	MOVL	(AX),IDTR /**/
 
 	/* point data segment at low memory */
 	XORL	AX,AX
-	MOVW	AX,DS
+/*	MOVW	AX,DS /**/
 
-	/* load gdt address (valid after paging) */
+	/* point CPU at the interrupt/trap table */
 	LEAL	gdtptr(SB),AX
-	MOVL	-KZERO(AX),GDTR
+/*	MOVL	(AX),GDTR /**/
 
 	CALL	main(SB)
 	/* never returns */


@@ 132,12 146,12 @@ TEXT	invtrap(SB),$0
  */
 alltrap:
 
-	PUSHL	DS
+/*	PUSHL	DS	/**/
 	PUSHAL
 	MOVL	$KDSEL, AX
-	MOVW	AX, DS
+/*	MOVW	AX, DS /**/
 	CALL	trap(SB)
 	POPAL
-	POPL	DS
+/*	POPL	DS	/**/
 	ADDL	$8,SP		/* pop the trap and error codes */
 	IRETL

@@ 127,7 127,8 @@ devstat(Chan *c, char *db, Dirtab *tab, int ntab, Devgen *gen)
 				convD2M(&dir, db);
 				return;
 			}
-			panic("devstat");
+			print("devstat %c %lux\n", devchar[c->type], c->qid.path);
+			error(Enonexist);
 		case 0:
 			break;
 		case 1:

@@ 11,7 11,7 @@ enum {
 	Nmask=		0x7,
 };
 
-#define DPRINT if(q->flag&QDEBUG)print
+#define DPRINT if(q->flag&QDEBUG)kprint
 
 typedef struct Urp	Urp;