feat(kernel): cga text mode driver

kernel/Makefile

@@ -12,7 +12,11 @@ SRCS	= kernel.asm \
 			lock.inc \
 			gdt.inc \
 			isr.inc \
-			pic.inc
+			pic.inc \
+			idt.inc \
+			dev/at/pit.inc \
+			dev/at/cga.inc \
+			dev/at/kbd.inc
 
 .PHONY: all
 all: $(KERNEL)

kernel/dev/at/cga.inc

@@ -0,0 +1,131 @@
+	;; File: cga.inc
+	;;
+	;; Usefull links:
+	;; - <http://www.techhelpmanual.com/901-color_graphics_adapter_i_o_ports.html>
+	;; - <http://www.osdever.net/FreeVGA/vga/crtcreg.htm>
+CGA_MEMORY      = 0xC00B8000
+CGA_COMMAND     = 0x3d4
+CGA_DATA        = 0x3d5
+CGA_CURSOR_HIGH = 0xE
+CGA_CURSOR_LOW  = 0xF
+CGA_COLUMNS = 80
+CGA_LINES = 24
+
+	;; Function: cga_getpos
+	;; 
+	;; Out:
+	;;    AX - cursor position
+cga_getpos:
+	; read cursor position
+	xor ax, ax
+
+	xchg bx, bx
+	
+	; get high
+	mov dx, CGA_COMMAND
+	mov al, CGA_CURSOR_HIGH
+	out dx, al
+	mov dx, CGA_DATA
+	in al, dx
+	xchg al, ah
+
+	; get low
+	mov dx, CGA_COMMAND
+	mov al, CGA_CURSOR_LOW
+	out dx, al
+	mov dx, CGA_DATA
+	in al, dx
+
+	ret
+
+	;; Function: cga_setpos
+	;; 
+	;; In:
+	;;    AX - cursor position
+cga_setpos:
+	xchg bx, bx
+	mov dx, CGA_COMMAND
+	push ax
+	mov al, CGA_CURSOR_HIGH
+	out dx, al
+	pop ax
+	xchg al, ah
+	mov dx, CGA_DATA
+	out dx, al
+
+	mov dx, CGA_COMMAND
+	mov al, CGA_CURSOR_LOW
+	out dx, al
+	xchg al, ah
+	mov dx, CGA_DATA
+	out dx, al
+
+	ret
+
+	;; Function: cga_putc
+	;; 
+	;; In:
+	;;    AL - charactere to print
+cga_putc:
+	push ebp
+	mov ebp, esp
+	sub esp, 0x2
+
+	push eax
+	call cga_getpos
+	mov [ebp-0x2], ax
+	pop eax
+
+	cmp al, LF
+	jne @f
+	mov ax, [ebp-0x2]
+	mov dl, CGA_COLUMNS
+	div dl
+	mov al, CGA_COLUMNS
+	sub al, ah
+	xor ah, ah
+	mov cx, [ebp-0x2]
+	add cx, ax
+	jmp .end
+@@:
+	mov edx, CGA_MEMORY
+	xor ecx, ecx
+	mov cx, [ebp-0x2]
+	shl cx, 1
+	add edx, ecx
+	mov ah, 0x07
+	mov word [edx], ax
+	mov cx, [ebp-0x2]
+	inc cx
+
+	mov ax, cx
+	mov dl, CGA_COLUMNS
+	div dl
+	cmp al, CGA_LINES
+	jbe .end
+
+	mov [ebp-0x2], cx
+
+	; scroll up
+	push esi
+	push edi
+	mov ecx, CGA_COLUMNS*(CGA_LINES-1)
+	mov edi, CGA_MEMORY
+	mov esi, CGA_MEMORY+80*2
+	rep movsw
+
+	mov ecx, CGA_COLUMNS
+	xor ax, ax
+	mov edi, CGA_MEMORY+(CGA_COLUMNS*(CGA_LINES-1)*2)
+	rep stosw
+
+	pop esi
+	pop edi
+
+	mov cx, CGA_COLUMNS*(CGA_LINES-1)
+.end:
+	mov ax, cx
+	call cga_setpos
+
+	leave
+	ret

kernel/dev/at/kbd.inc

@@ -0,0 +1,18 @@
+	;; File: kbd.inc
+
+kbd_getc:
+	ret
+
+kbd_irq:
+	pusha
+
+	mov esi, szMsgKbdIRQ
+	call klog
+
+	mov al, PIC_EOI
+	out PIC1_COMMAND, al
+
+	popa
+	iret
+
+szMsgKbdIRQ db "KBD: IRQ", 0

kernel/dev/at/pit.inc

@@ -0,0 +1,29 @@
+	;; File: pit.inc
+	;;
+	;; Usefull links:
+	;; - <http://www.osdever.net/bkerndev/Docs/pit.htm>
+
+PIT_CHANNEL0 = 0x40
+PIT_CHANNEL1 = 0x40
+PIT_CHANNEL2 = 0x42
+PIT_COMMAND  = 0x43
+
+	;; Function: pit_init
+pit_init:
+	ret
+
+	;; Function: pit_irq
+pit_irq:
+	pusha
+
+	;mov esi, szMsgPitIRQ
+	;call klog
+
+	mov al, PIC_EOI
+	out PIC1_COMMAND, al
+
+	popa 
+
+	iret
+
+szMsgPitIRQ db "PIT: IRQ", 0

kernel/dev/console.inc

@@ -0,0 +1,2 @@
+	;; File: console.inc
+

kernel/dev/dev.inc

@@ -0,0 +1,9 @@
+	;; File: dev.inc
+
+
+
+struc Device {
+	.write dd ?
+	.read  dd ?
+}
+

kernel/gdt.inc

@@ -1,3 +1,4 @@
+	;; File: gdt.inc
 
 gdt:
 	; null descriptor
@@ -30,3 +31,7 @@ gdt:
 pGDT:
 	dw gdt.end - gdt - 1
 	dd gdt
+
+gdt_set_tss:
+	
+	ret

kernel/idt.inc

@@ -1,10 +1,51 @@
+	;; File: idt.inc
 
-idt_set_table:
+idt_set_gate:
+	mov [aInterruptGate + (ecx * 8)], ax
+	mov [aInterruptGate + (ecx * 8) + 2], word 0x08
+
+	mov [aInterruptGate + (ecx * 8) + 5], word 0x8E
+	shr eax, 16
+	mov [aInterruptGate + (ecx * 8) + 6], ax
 	ret
 
 idt_setup:
+	xor ecx, ecx
+@@:
+	mov eax, [aISRTable + (ecx * 4)]
+	call idt_set_gate
+	inc ecx
+	cmp ecx, 32
+	jb @b
+
+	mov eax, pit_irq
+	call idt_set_gate
+	inc ecx
+
+	mov eax, kbd_irq
+	call idt_set_gate
+	inc ecx
+
+@@:
+	mov eax, irq_dummy
+	call idt_set_gate
+	inc ecx
+	cmp ecx, 0x30
+	jb @b
+
+	mov ecx, 0x42
+	mov eax, isr_syscall
+	call idt_set_gate
+
+	lidt [pIDT]
+	sti
 	ret
 
-pIdt:
+pIDT:
-	dw ?
+	dw aInterruptGate.end-aInterruptGate-1
-	dd ?
+	dd aInterruptGate
+
+; variable: idt_entries
+aInterruptGate:
+	dd 256*2 dup(0)
+.end:

kernel/irq.inc

@@ -0,0 +1,2 @@
+irq_dummy:
+	iret

kernel/isr.inc

@@ -18,54 +18,6 @@ forward
 				 
 }
 
-idt_setup:
-	xor ecx, ecx
-@@:
-	mov eax, [aISRTable + (ecx * 4)]
-	mov [aInterruptGate + (ecx * 8)], ax
-	mov [aInterruptGate + (ecx * 8) + 2], word 0x08
-
-	mov [aInterruptGate + (ecx * 8) + 5], word 0x8E
-	shr eax, 16
-	mov [aInterruptGate + (ecx * 8) + 6], ax
-	inc ecx
-	cmp ecx, 32
-	jb @b
-@@:
-	mov eax, irq_dummy
-	mov [aInterruptGate + (ecx * 8)], ax
-	mov [aInterruptGate + (ecx * 8) + 2], word 0x08
-
-	mov [aInterruptGate + (ecx * 8) + 5], word 0x8E
-	shr eax, 16
-	mov [aInterruptGate + (ecx * 8) + 6], ax
-	inc ecx
-	cmp ecx, 0x30
-	jb @b
-
-	mov ecx, 0x42
-	mov eax, isr_syscall
-	mov [aInterruptGate + (ecx * 8)], ax
-	mov [aInterruptGate + (ecx * 8) + 2], word 0x08
-
-	mov [aInterruptGate + (ecx * 8) + 5], word 0x8E
-	shr eax, 16
-	mov [aInterruptGate + (ecx * 8) + 6], ax
-
-	lidt [pIDT]
-	sti
-	ret
-
-pIDT:
-	dw aInterruptGate.end-aInterruptGate-1
-	dd aInterruptGate
-
-; variable: idt_entries
-aInterruptGate:
-	dd 256*2 dup(0)
-.end:
-
-
 irq_dummy:
 	iret
 

kernel/kernel.asm

@@ -60,10 +60,15 @@ kmain:
 	lgdt [pGDT]
 	; I don't think i need to reload segment cuz their value are already correct
 
-
 	call idt_setup
 
-	;int 0x42
+	call pit_init
+
+	mov eax, SYSCALL_EXIT
+	int 0x42
+
+	mov al, 'X'
+	call cga_putc
 
 .halt:
 	hlt
@@ -81,7 +86,11 @@ kmain:
 	include 'gdt.inc'
 	include 'syscall.inc'
 	include 'isr.inc'
+	include 'idt.inc'
 	include 'pic.inc'
+	include 'dev/at/pit.inc'
+	include 'dev/at/kbd.inc'
+	include 'dev/at/cga.inc'
 
 
 szMsgKernelAlive db "Kernel (", VERSION_FULL , ") is alive", 0

kernel/klog.inc

@@ -34,7 +34,7 @@ klog_print:
 	or al, al
 	jz @f
 	out dx, al
-	;call klog_kputc
+	;call klog_kput
 	jmp @b
 @@:
 	ret

kernel/sys/coff.inc

@@ -1,3 +1,6 @@
+	;; File: coff.inc
+
+	;; Struc: COFFFileHdr
 struc COFFFileHdr {
 	.f_magic  dw ?
 	.f_nscns  dw ?

lib/crypto/rc4/rc4.asm

@@ -16,9 +16,20 @@ rc4_init:
 	mov ebp, esp
 
 	mov eax, [ebp+8]
-	xor ecx, ecx
+	xor cx, cx
+
+@@:
+	mov byte [eax], byte cx
+	inc cx
+	inc eax
+	cmp cx, 255
+	jne @b
+
+	xor cx, cx
+	mov eax, [ebp+8]
+@@:
+	
 
-.loop:
 
 .end:
 	leave