Added IDT support. (v2)

Author: levex

README.md

@@ -9,6 +9,7 @@ Latest commits supports:
 - Textmode printf()
 - panic()
 - semi-modules and mprint()
-- GDT (WIP)
+- GDT
+- IDT
 - Minecraft as well
 

arch/makefile

@@ -1,3 +1,4 @@
 all:
-	echo -n "arch/gdt.o " >> ../objs.txt
+	echo -n "arch/gdt.o arch/idt.o " >> ../objs.txt
 	i586-elf-gcc -c gdt.c -o gdt.o -std=gnu99 -ffreestanding -O2 -Wall -Wextra
+	i586-elf-gcc -c idt.c -o idt.o -std=gnu99 -ffreestanding -O2 -Wall -Wextra

boot.s

@@ -16,7 +16,7 @@
 # foglalunk a stack-nek 16KiB-ot
 .section .bootstrap_stack
 stack_bottom:
-.skip 16384 # 16 KiB
+.skip 32768 # 16 KiB
 stack_top:
 
 # az elf-ben a .text szekcio tartalmazza a kodot amit futtatni fogunk
@@ -28,6 +28,19 @@ _set_gdtr:
 	movl %esp, %ebp
 
 	lgdt 0x400000
+
+	movl %ebp, %esp
+	pop %ebp
+	ret
+
+.global _set_idtr
+.type _set_idtr, @function
+_set_idtr:
+	push %ebp
+	movl %esp, %ebp
+
+	lidt 0x401F00
+
 	movl %ebp, %esp
 	pop %ebp
 	ret

display/textmode/dispi_textmode.c

@@ -18,9 +18,15 @@ inline uint16_t __textmode_create_entry(char c, uint8_t color)
 	return _char | _color << 8;
 }
 
-inline void __textmode_scrollup()
+static inline void __textmode_scrollup()
 {
-
+	uint16_t nullentry = __textmode_create_entry(' ', __textmode_make_color(d.con.fgcol, d.con.bgcol));
+	for(int y = 0; y < TEXTMODE_HEIGHT; y++)
+	{
+		memcpy(VGA_MEMORY + y*TEXTMODE_WIDTH*2 ,
+			VGA_MEMORY + (y+1)*TEXTMODE_WIDTH*2,
+			TEXTMODE_WIDTH*2);
+	}
 }
 
 void __textmode_onregister()
@@ -85,6 +91,11 @@ void textmode_putc(char c)
 		d.con.cx = 0;
 		d.con.cy ++;
 	}
+	if(d.con.cy >= TEXTMODE_HEIGHT-1)
+	{
+		__textmode_scrollup();
+		d.con.cy --;
+	}
 	/* list of special characters */
 	if(c == '\n' || c == 0) return;
 	/* write it to video memory */

include/display.h

@@ -19,8 +19,9 @@ typedef struct {
 	void (*clear)();
 } DISPLAY;
 #define MODULE(name) static char* __MODULE_NAME = name;
-#define panic(...) kprintf("***KERNEL PANIC*** in %s at line %d in function: %s\n%s", __FILE__, __LINE__, __func__, __VA_ARGS__); for(;;);
+#define panic(...) {kprintf("***KERNEL PANIC*** in %s at line %d in function: %s\n%s", __FILE__, __LINE__, __func__, __VA_ARGS__); for(;;);}
 #define mprint(...) {kprintf("[%s]: ", __MODULE_NAME); kprintf(__VA_ARGS__);}
+#define kerror(...) {kprintf("***KERNEL OOPS***: "); kprintf(__VA_ARGS__);}
 extern uint8_t display_register(DISPLAY d);
 extern uint8_t display_setcurrent(uint8_t id);
 extern DISPLAY* display_getcurrent();

include/memory.h

@@ -5,5 +5,6 @@
 #include <stddef.h>
 extern void* memcpy(const void* dest, const void* src, size_t num );
 extern void* memset (void * ptr, int value, size_t num );
+extern void* memset16 (void *ptr, uint16_t value, size_t num);
 
 #endif

main.c

@@ -10,6 +10,7 @@
 #include "include/display.h"
 #include "display/textmode/dispi_textmode.h"
 #include "include/x86/gdt.h"
+#include "include/x86/idt.h"
 
 static DISPLAY* disp = 0;
 
@@ -31,6 +32,11 @@ void kernel_main()
 	 * tables, timers and memory to continue to tasking.
 	 */
 	gdt_init();
-	/* start tasking */
-	panic("Init couldn't be started.");
+	/* Now, we have the GDT setup, let's load the IDT as well */
+	idt_init();
+	/* Next step, setup PIT. */
+	/* Setup memory manager */
+	/* Setup paging. */
+	/* Enable interrupts and tasking. */
+	panic("Reached end of main(), but no init was started.");
 }

memory/memutils.c

@@ -25,7 +25,13 @@ void* memcpy(const void* dest, const void* src, size_t count )
 	}
 	return (void*)dest;
 }
-
+void* memset16 (void *ptr, uint16_t value, size_t num)
+{
+	uint8_t* p = ptr;
+	while(num--)
+		*p++ = value;
+	return ptr;
+}
 void* memset (void * ptr, int value, size_t num )
 {
 	unsigned char* p=ptr;