Small adjustments:

- add missing vim modelines
- idt_set_ex_handler, idt_set_irq_handler
- inline inb,inw,outb,outw
- add defines for exceptions and irqs

11 files changed, 140 insertions, 76 deletions

diff --git a/gdb_cmd b/gdb_cmd
index b50623b..e1480eb 100644
--- a/gdb_cmd
+++ b/gdb_cmd
@@ -1,2 +1,2 @@
 target remote localhost:1234
-break l0/sys.cpp:panic_do
+break l0/sys.c:panic_do
diff --git a/kernel/Makefile b/kernel/Makefile
index 43b8c7e..34e6a2e 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -31,6 +31,6 @@ $(OUT): $(OBJ)
 clean:
 	rm */*.o || true
 mrproper: clean
-	rm $(OUT)
+	rm $(OUT) || true
 
 rebuild: mrproper all
diff --git a/kernel/config.h b/kernel/config.h
index da2956a..b1a97b2 100644
--- a/kernel/config.h
+++ b/kernel/config.h
@@ -24,5 +24,4 @@ extern char k_highhalf_addr;	// defined in linker script : 0xC0000000
 #define DBGLOG_TO_SERIAL
 #define DBGLOG_TO_SCREEN
 
-
 /* vim: set ts=4 sw=4 tw=0 noet :*/
diff --git a/kernel/include/idt.h b/kernel/include/idt.h
index 5730f5e..ba344c9 100644
--- a/kernel/include/idt.h
+++ b/kernel/include/idt.h
@@ -8,6 +8,56 @@
 
 #include <config.h>
 
+#define IRQ0  0
+#define IRQ1  1
+#define IRQ2  2
+#define IRQ3  3
+#define IRQ4  4
+#define IRQ5  5
+#define IRQ6  6
+#define IRQ7  7
+#define IRQ8  8
+#define IRQ9  9
+#define IRQ10 10
+#define IRQ11 11
+#define IRQ12 12
+#define IRQ13 13
+#define IRQ14 14
+#define IRQ15 15
+
+#define EX_DIVIDE_ERROR                  0         // No error code
+#define EX_DEBUG                         1         // No error code
+#define EX_NMI_INTERRUPT                 2         // No error code
+#define EX_BREAKPOINT                    3         // No error code
+#define EX_OVERFLOW                      4         // No error code
+#define EX_BOUND_RANGE_EXCEDEED          5         // No error code
+#define EX_INVALID_OPCODE                6         // No error code
+#define EX_DEVICE_NOT_AVAILABLE          7         // No error code
+#define EX_DOUBLE_FAULT                  8         // Yes (Zero)
+#define EX_COPROCESSOR_SEGMENT_OVERRUN   9         // No error code
+#define EX_INVALID_TSS                  10         // Yes
+#define EX_SEGMENT_NOT_PRESENT          11         // Yes
+#define EX_STACK_SEGMENT_FAULT          12         // Yes
+#define EX_GENERAL_PROTECTION           13         // Yes
+#define EX_PAGE_FAULT                   14         // Yes
+#define EX_INTEL_RESERVED_1             15         // No
+#define EX_FLOATING_POINT_ERROR         16         // No
+#define EX_ALIGNEMENT_CHECK             17         // Yes (Zero)
+#define EX_MACHINE_CHECK                18         // No
+#define EX_INTEL_RESERVED_2             19         // No
+#define EX_INTEL_RESERVED_3             20         // No
+#define EX_INTEL_RESERVED_4             21         // No
+#define EX_INTEL_RESERVED_5             22         // No
+#define EX_INTEL_RESERVED_6             23         // No
+#define EX_INTEL_RESERVED_7             24         // No
+#define EX_INTEL_RESERVED_8             25         // No
+#define EX_INTEL_RESERVED_9             26         // No
+#define EX_INTEL_RESERVED_10            27         // No
+#define EX_INTEL_RESERVED_11            28         // No
+#define EX_INTEL_RESERVED_12            29         // No
+#define EX_INTEL_RESERVED_13            30         // No
+#define EX_INTEL_RESERVED_14            31         // No
+
 struct idt_entry {
 	uint16_t base_lo;		//Low part of address to jump to
 	uint16_t sel;			//Kernel segment selector
@@ -34,7 +84,8 @@ typedef struct registers registers_t;
 typedef void (*isr_handler_t)(registers_t*);
 
 void idt_init();
-//void idt_handleIrq(int number, isr_handler_t func);	//Set IRQ handler
 
+void idt_set_ex_handler(int number, isr_handler_t func);	//Set exception handler
+void idt_set_irq_handler(int number, isr_handler_t func);	//Set IRQ handler
 
 /* vim: set ts=4 sw=4 tw=0 noet :*/
diff --git a/kernel/include/sys.h b/kernel/include/sys.h
index 319cbef..2304eec 100644
--- a/kernel/include/sys.h
+++ b/kernel/include/sys.h
@@ -2,10 +2,25 @@
 
 #include <config.h>
 
-void outb(uint16_t port, uint8_t value);
-void outw(uint16_t port, uint16_t value);
-uint8_t inb(uint16_t port);
-uint16_t inw(uint16_t port);
+static inline void outb(uint16_t port, uint8_t value) {
+	asm volatile("outb %1, %0" : : "dN"(port), "a"(value));
+}
+
+static inline void outw(uint16_t port, uint16_t value) {
+	asm volatile("outw %1, %0" : : "dN"(port), "a"(value));
+}
+
+static inline uint8_t inb(uint16_t port) {
+	uint8_t ret;
+	asm volatile("inb %1, %0" : "=a"(ret) : "dN"(port));
+	return ret;
+}
+
+static inline uint16_t inw(uint16_t port) {
+	uint16_t ret;
+	asm volatile("inw %1, %0" : "=a"(ret) : "dN"(port));
+	return ret;
+}
 
 void panic(const char* message, const char* file, int line);
 void panic_assert(const char* assertion, const char* file, int line);
diff --git a/kernel/l0/idt.c b/kernel/l0/idt.c
index a0e19dd..8a981af 100644
--- a/kernel/l0/idt.c
+++ b/kernel/l0/idt.c
@@ -62,19 +62,22 @@ static idt_entry_t idt_entries[256];
 static idt_ptr_t idt_ptr;
 
 static isr_handler_t irq_handlers[16] = {0};
+static isr_handler_t ex_handlers[32] = {0};
 
-/*	Called in idt_.asm when an exception fires (interrupt 0 to 31).
-	Tries to handle the exception, panics if fails. */
-void idt_isrHandler(registers_t *regs) {
-	dbg_printf("/ ISR %i\n", regs->int_no);
+/*	Called in interrupt.s when an exception fires (interrupt 0 to 31) */
+void idt_exHandler(registers_t *regs) {
+	dbg_printf("/ Exception %i\n", regs->int_no);
 	dbg_printf("| EAX: 0x%p   EBX: 0x%p   ECX: 0x%p   EDX: 0x%p\n", regs->eax, regs->ebx, regs->ecx, regs->edx);
 	dbg_printf("| EDI: 0x%p   ESI: 0x%p   ESP: 0x%p   EBP: 0x%p\n", regs->edi, regs->esi, regs->esp, regs->ebp);
 	dbg_printf("| EIP: 0x%p   CS : 0x%p   DS : 0x%p   SS : 0x%p\n", regs->eip, regs->cs, regs->ds, regs->ss);
 	dbg_printf("\\ EFl: 0x%p   I# : 0x%p   Err: 0x%p\n", regs->eflags, regs->int_no, regs->err_code);
+
+	if (ex_handlers[regs->int_no] != 0) {
+		ex_handlers[regs->int_no](regs);
+	}
 } 
 
-/*	Called in interrupt.asm when an IRQ fires (interrupt 32 to 47)
-	Possibly wakes up a thread that was waiting, possibly calls a handler. */
+/*	Called in interrupt.s when an IRQ fires (interrupt 32 to 47) */
 void idt_irqHandler(registers_t *regs) {
 	if (regs->err_code > 7) {
 		outb(0xA0, 0x20);
@@ -87,10 +90,10 @@ void idt_irqHandler(registers_t *regs) {
 	}
 }
 
-/* syscall handler */
+/* Caled in interrupt.s when a syscall is called */
 void idt_syscallHandler(registers_t *regs) {
 	dbg_printf("Syscall %i\n", regs->int_no);
-	// do nothing...
+	// do nothing, yet.
 }
 
 /*	For internal use only. Sets up an entry of the IDT with given parameters. */
@@ -178,10 +181,17 @@ void idt_init() {
 }
 
 /*	Sets up an IRQ handler for given IRQ. */
-void idt_handleIrq(int number, isr_handler_t func) {
+void idt_set_irq_handler(int number, isr_handler_t func) {
 	if (number < 16 && number >= 0) {
 		irq_handlers[number] = func;
 	}
 }
 
+/*	Sets up a handler for a processor exception */
+void idt_set_ex_handler(int number, isr_handler_t func) {
+	if (number >= 0 && number < 32) {
+		ex_handlers[number] = func;
+	}
+}
+
 /* vim: set ts=4 sw=4 tw=0 noet :*/
diff --git a/kernel/l0/interrupt.s b/kernel/l0/interrupt.s
index ddd1e76..d40fff0 100644
--- a/kernel/l0/interrupt.s
+++ b/kernel/l0/interrupt.s
@@ -33,25 +33,25 @@
 	iret
 %endmacro
 
-COMMONSTUB isr
+COMMONSTUB ex
 COMMONSTUB irq
 COMMONSTUB syscall
 
 ;************************************************************************************
 
-%macro ISR_NOERRCODE 1  ; define a macro, taking one parameter
+%macro EX_NOERRCODE 1  ; define a macro, taking one parameter
 	[GLOBAL isr%1]        ; %1 accesses the first parameter.
 	isr%1:
 		push byte 0
 		push byte %1
-		jmp isr_common_stub
+		jmp ex_common_stub
 %endmacro
 
-%macro ISR_ERRCODE 1
+%macro EX_ERRCODE 1
 	[GLOBAL isr%1]
 	isr%1:
 		push byte %1
-		jmp isr_common_stub
+		jmp ex_common_stub
 %endmacro
 
 %macro IRQ 2
@@ -71,38 +71,38 @@ COMMONSTUB syscall
 		jmp syscall_common_stub
 %endmacro
 
-ISR_NOERRCODE 0
-ISR_NOERRCODE 1
-ISR_NOERRCODE 2
-ISR_NOERRCODE 3
-ISR_NOERRCODE 4
-ISR_NOERRCODE 5
-ISR_NOERRCODE 6
-ISR_NOERRCODE 7
-ISR_ERRCODE 8
-ISR_NOERRCODE 9
-ISR_ERRCODE 10
-ISR_ERRCODE 11
-ISR_ERRCODE 12
-ISR_ERRCODE 13
-ISR_ERRCODE 14
-ISR_NOERRCODE 15
-ISR_NOERRCODE 16
-ISR_NOERRCODE 17
-ISR_NOERRCODE 18
-ISR_NOERRCODE 19
-ISR_NOERRCODE 20
-ISR_NOERRCODE 21
-ISR_NOERRCODE 22
-ISR_NOERRCODE 23
-ISR_NOERRCODE 24
-ISR_NOERRCODE 25
-ISR_NOERRCODE 26
-ISR_NOERRCODE 27
-ISR_NOERRCODE 28
-ISR_NOERRCODE 29
-ISR_NOERRCODE 30
-ISR_NOERRCODE 31
+EX_NOERRCODE 0
+EX_NOERRCODE 1
+EX_NOERRCODE 2
+EX_NOERRCODE 3
+EX_NOERRCODE 4
+EX_NOERRCODE 5
+EX_NOERRCODE 6
+EX_NOERRCODE 7
+EX_ERRCODE 8
+EX_NOERRCODE 9
+EX_ERRCODE 10
+EX_ERRCODE 11
+EX_ERRCODE 12
+EX_ERRCODE 13
+EX_ERRCODE 14
+EX_NOERRCODE 15
+EX_NOERRCODE 16
+EX_NOERRCODE 17
+EX_NOERRCODE 18
+EX_NOERRCODE 19
+EX_NOERRCODE 20
+EX_NOERRCODE 21
+EX_NOERRCODE 22
+EX_NOERRCODE 23
+EX_NOERRCODE 24
+EX_NOERRCODE 25
+EX_NOERRCODE 26
+EX_NOERRCODE 27
+EX_NOERRCODE 28
+EX_NOERRCODE 29
+EX_NOERRCODE 30
+EX_NOERRCODE 31
 
 IRQ	0,	32
 IRQ	1,	33
diff --git a/kernel/l0/kmain.c b/kernel/l0/kmain.c
index 854a2b7..7665cb0 100644
--- a/kernel/l0/kmain.c
+++ b/kernel/l0/kmain.c
@@ -5,6 +5,11 @@
 
 #include <gdt.h>
 #include <idt.h>
+
+void breakpoint_handler(registers_t *regs) {
+	dbg_printf("Breakpoint! (int3)\n");
+	BOCHS_BREAKPOINT;
+}
  
 void kmain(struct multiboot_info_t *mbd, int32_t mb_magic) {
 	dbglog_setup();
@@ -17,6 +22,7 @@ void kmain(struct multiboot_info_t *mbd, int32_t mb_magic) {
 	gdt_init(); dbg_printf("GDT set up.\n");
 
 	idt_init(); dbg_printf("IDT set up.\n");
+	idt_set_ex_handler(EX_BREAKPOINT, breakpoint_handler);
 
 	asm volatile("int $0x3");
 
diff --git a/kernel/l0/sys.c b/kernel/l0/sys.c
index f6a9900..b388eba 100644
--- a/kernel/l0/sys.c
+++ b/kernel/l0/sys.c
@@ -2,28 +2,6 @@
 #include <dbglog.h>
 
 
-// C wrappers for inb/outb/inw/outw
-
-void outb(uint16_t port, uint8_t value) {
-	asm volatile("outb %1, %0" : : "dN"(port), "a"(value));
-}
-
-void outw(uint16_t port, uint16_t value) {
-	asm volatile("outw %1, %0" : : "dN"(port), "a"(value));
-}
-
-uint8_t inb(uint16_t port) {
-	uint8_t ret;
-	asm volatile("inb %1, %0" : "=a"(ret) : "dN"(port));
-	return ret;
-}
-
-uint16_t inw(uint16_t port) {
-	uint16_t ret;
-	asm volatile("inw %1, %0" : "=a"(ret) : "dN"(port));
-	return ret;
-}
-
 // Kernel panic and kernel assert failure
 
 static void panic_do(const char* type, const char *msg, const char* file, int line) {
@@ -42,3 +20,5 @@ void panic(const char* message, const char* file, int line) {
 void panic_assert(const char* assertion, const char* file, int line) {
 	panic_do("ASSERT FAILED", assertion, file, line);
 }
+
+/* vim: set ts=4 sw=4 tw=0 noet :*/
diff --git a/kernel/lib/printf.c b/kernel/lib/printf.c
index c1ef83b..68e08d8 100644
--- a/kernel/lib/printf.c
+++ b/kernel/lib/printf.c
@@ -116,3 +116,5 @@ int vsnprintf(char *buff, size_t len, const char* format, va_list ap){
 	*buff = '\0';
 	return result;
 }
+
+/* vim: set ts=4 sw=4 tw=0 noet :*/
diff --git a/kernel/lib/string.c b/kernel/lib/string.c
index 6d26478..9dce27b 100644
--- a/kernel/lib/string.c
+++ b/kernel/lib/string.c
@@ -87,3 +87,4 @@ void *memset(void *dest, int val, size_t count) {
 	return dest;
 }
 
+/* vim: set ts=4 sw=4 tw=0 noet :*/