Import backup from 2003-08-31

io.asm

@@ -0,0 +1,332 @@
+
+;void writeCursorPosition(dword pos);
+;dword getCursorPosition();
+
+[global _writeCursorPosition]
+[global _getCursorPosition]
+[global _putc]
+[global _printf]
+[global _console_scroll]
+[global _console_cls]
+[global _putHex]
+[global _putDec]
+
+
+;
+;void writeCursorPosition(int position)
+;
+_writeCursorPosition:
+	push	ebp
+	mov	ebp, esp
+
+	push	ebx
+	push	edx
+
+	mov	eax, [ebp+8]	;cursor position in ax
+
+	mov	bl, al
+	mov	dx, 0x03D4
+	mov	al, 0x0E
+	out	dx, al
+
+	inc	dx
+	mov	al, ah
+	out	dx, al
+
+	dec	dx
+	mov	al, 0x0F
+	out	dx, al
+
+	inc	dx
+	mov	al, bl
+	out	dx, al
+
+	pop	edx
+	pop	ebx
+	pop	ebp
+
+	ret
+
+
+;
+;word getCursorPosition()
+;
+_getCursorPosition:
+	push	ebx
+	push	edx
+
+	xor	eax, eax
+	mov	dx, 0x03D4
+	mov	al, 0x0E
+	out	dx, al
+
+	inc	dx
+	in	al, dx
+	mov	bl, al
+
+	dec	dx
+	mov	al, 0x0F
+	out	dx, al
+
+	inc	dx
+	in	al, dx
+	mov	ah, bl
+
+	pop	edx
+	pop	ebx
+
+	ret
+
+
+;
+;void putc(int chr)
+;
+_putc:
+	push	ebp
+	mov	ebp, esp
+	push	ebx
+	push	ecx
+	push	edx
+
+	call	_getCursorPosition
+	mov	ebx, eax
+	mov	ecx, ebx
+
+	mov	eax, [ebp+8]			;al=character
+	cmp	al, 10				;newline
+	jz	putc_newline
+	cmp	al, 9				;tab
+	jz	putc_tab	
+
+	shl	ebx, 1
+	add	ebx, 0xb8000
+	mov	ah, 0x07
+	mov	[ebx], ax
+	mov	eax, ecx
+	inc	eax
+	cmp	eax, 2000
+	jnz	putc_writeit2
+	call	_console_scroll
+	mov	eax, 2000-80
+putc_writeit2:
+	push	eax
+	call	_writeCursorPosition
+	add	esp, 4
+	jmp	putc_done
+
+putc_newline:
+	mov	eax, ebx			;eax = cursor position
+	mov	ebx, 80
+	xor	edx, edx
+	div	bx				;ax=dx:ax/bx, dx=remainder
+	mov	bx, 80
+	sub	bx, dx
+	mov	eax, ecx
+	add	eax, ebx			;eax = new cursor position
+	cmp	eax, 2000
+	jnz	putc_newline_writeit2
+	call	_console_scroll
+	mov	eax, 2000-80			;beginning of last row
+putc_newline_writeit2:
+	push	eax
+	call	_writeCursorPosition
+	add	esp, 4
+	jmp	putc_done
+
+putc_tab:
+	mov	eax, ebx			;eax = cursor position
+	mov	ebx, 8
+	div	bl				;al=ax/bl, ah=remainder
+	xor	edx, edx
+	mov	dl, ah
+	mov	bx, 8
+	sub	bx, dx
+	mov	eax, ecx
+	add	eax, ebx			;eax = new cursor position
+	cmp	eax, 2000
+	jnz	putc_tab_writeit2
+	call	_console_scroll
+	mov	eax, 2000-80			;beginning of last row
+putc_tab_writeit2:
+	push	eax
+	call	_writeCursorPosition
+	add	esp, 4
+
+putc_done:
+	pop	edx
+	pop	ecx
+	pop	ebx
+	pop	ebp
+
+	ret
+
+
+
+;
+;void printf(char *fmt, ... )
+;
+_printf:
+	push	ebp
+	mov	ebp, esp
+	pusha
+	mov	ebx, [ebp+8]			;ebx = ptr in format string
+	mov	esi, ebp
+	add	esi, 12				;esi = ptr to next variable arg
+	xor	ecx, ecx			;ecx used if we encounter a '%'
+printf_loop:
+	mov	al, [ebx]
+	inc	ebx
+	cmp	al, 0
+	jz	printf_done
+	cmp	al, '%'
+	jz	printf_percent
+	cmp	ecx, 1
+	jz	printf_special
+
+	push	eax
+	call	_putc
+	add	esp, 4
+	jmp	printf_loop
+
+printf_special:
+	xor	ecx, ecx
+	cmp	al, 'd'
+	jz	printf_decimal
+	cmp	al, 'x'
+	jz	printf_hex
+	cmp	al, '%'
+	jz	printf_ppercent
+	jmp	printf_special_done
+
+printf_decimal:
+	mov	eax, [esi]
+	push	eax
+	call	_putDec
+	add	esp, 4
+	jmp	printf_special_done
+
+printf_hex:
+	mov	eax, [esi]
+	push	eax
+	call	_putHex
+	add	esp, 4
+	jmp	printf_special_done
+
+printf_ppercent:
+	push	eax
+	call	_putc
+	add	esp, 4
+	jmp	printf_special_done
+
+printf_special_done
+	add	esi, 4				;point to next extra argument
+	jmp	printf_loop
+
+printf_percent:
+	mov	ecx, 1
+	jmp	printf_loop
+
+
+printf_done:
+	popa
+	pop	ebp
+	ret
+
+
+
+;
+;void console_scroll()
+;
+_console_scroll:
+	pusha
+	mov	esi, 0xb8000+160
+	mov	edi, 0xb8000
+	mov	ecx, 960			;(2000-80)/2
+console_scroll_loop:
+	lodsd
+	stosd
+	loop	console_scroll_loop
+	mov	ax, 0x0720
+	mov	ecx, 80
+console_scroll_loop2:
+	stosw
+	loop	console_scroll_loop2
+	popa
+	ret
+
+;
+;void console_cls()
+;
+_console_cls:
+	pusha
+	mov	edi, 0xb8000
+	mov	ax, 0x0720
+	mov	ecx, 2000
+console_cls_loop:
+	stosw
+	loop	console_cls_loop
+	push	dword 0
+	call	_writeCursorPosition
+	add	esp, 4
+	popa
+	ret
+
+;
+;void putHex(dword number)
+;
+_putHex:
+	push	ebp
+	mov	ebp, esp
+	pusha
+	mov	eax, [ebp+8]			;eax = number to print
+	xor	ebx, ebx			;we have not printed a character yet
+	mov	ecx, 8				;counter for number of characters
+
+putHex_loop:
+	push	eax
+	push	ecx
+
+	dec	ecx
+	shl	ecx, 2				;edx=counter*4 (amount to shift by)
+	shr	eax, cl
+	and	eax, 0x0F
+	cmp	cl, 0
+	jz	putHex_notzero			;if number is 0
+	cmp	al, 0
+	jnz	putHex_notzero
+	cmp	bl, 0
+	jz	putHex_loop_end
+putHex_notzero:
+	mov	bl, 1
+	add	eax, '0'
+	cmp	eax, '9'
+	jbe	putHex_dontadjust
+	add	eax, 'A'-'9'-1
+putHex_dontadjust:
+	push	eax
+	call	_putc
+	add	esp, 4
+
+putHex_loop_end:
+	pop	ecx
+	pop	eax
+	loop	putHex_loop
+
+	popa
+	pop	ebp
+	ret
+
+
+;
+;void putDec(dword number)
+;
+_putDec:
+
+	ret
+
+
+
+
+
+
+

kernel.c

@@ -3,6 +3,10 @@
 //Holtrop's Operating System
 
 #include "k_defines.h"
+
+#include "lib/string.h"
+#include "lib/io.h"
+
 #include "functions.h"
 #include "video.h"
 #include "mm.h"
@@ -33,6 +37,8 @@ void k_init()
 	}
 	video_rect(10, 10, 100, 100, 0x00FFFFFF);
 	video_rectf(11, 11, 99, 99, 0x00FFFF00);
+	console_cls();
+	mm_init();
 }
 
 void isr(dword num)
@@ -40,9 +46,6 @@ void isr(dword num)
 	if (num == 0x20)
 	{
 		timer++;
-		video_rect(20,20,600,600,timer);
-		(*(char*)0xB8000)++;
-		*(char*)0xB8001 = 7;
 		eoi();
 	}
 	//if (num == 0x21)

mm.c

@@ -1,12 +1,13 @@
 
 
-void	mm_init()
+
+void mm_init()
 {
-	dword	*memmap_entries = 0x9040A;
+	dword	*memmap_entries = (dword *) 0x9040A;
-	memmap_entry	*maps = 0x92000;
+	memmap_entry	*maps = (memmap_entry *) 0x92000;
-
+	dword a;
-
+	for (a=0;a<(*memmap_entries);a++)
-
+		printf("Entry %x:\tBase:  %x\n\t\tLimit: %x\n\t\tAttributes: %x\n", a, maps[a].base.lowdword, maps[a].limit.lowdword, maps[a].attributes);
 }
 
 

mm.h

@@ -6,7 +6,7 @@ void	mm_init();
 
 typedef struct {
 	qword	base;
-	qword	length;
+	qword	limit;
 	dword	attributes;
 } __attribute__((packed)) memmap_entry;
 

string.c

@@ -0,0 +1,13 @@
+
+#include "string.h"
+
+int strlen(char *str)
+{
+	int retn = 0;
+	while (*str++ != 0)
+		retn++;
+	return retn;
+}
+
+
+

string.h

@@ -0,0 +1,8 @@
+
+#ifndef __HSTRING_H__
+#define __HSTRING_H__ __HSTRING_H__
+
+int	strlen(char *str);
+
+#endif
+