From 62c211ade1606d82f9b262b68ef074ae07e26184 Mon Sep 17 00:00:00 2001
From: Michal Idziorek <m.i@gmx.at>
Date: Wed, 27 Aug 2014 14:43:16 +0200
Subject: boot directory cleanup continued

---
 boot/disk_load_16.asm    | 26 ++++++++++++++++++++++++++
 boot/print_string_16.asm | 28 ++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+)
 create mode 100644 boot/disk_load_16.asm
 create mode 100644 boot/print_string_16.asm

(limited to 'boot')

diff --git a/boot/disk_load_16.asm b/boot/disk_load_16.asm
new file mode 100644
index 0000000..3d0951d
--- /dev/null
+++ b/boot/disk_load_16.asm
@@ -0,0 +1,26 @@
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;;;;;; Miguel's FoolOS Helper Functions ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;
+;disk_load
+;
+
+[bits 16]
+
+
+;disk_load routune (load dh sectors from drive dl to es:bx)
+disk_load:
+
+    pusha
+
+    mov ah,0x02		;BIOS read sector func
+    mov al,dh		;read dh sectors (amount)
+    mov ch,0x00		;cyl 0
+    mov dh,0x00		;head 0
+    mov cl,0x02		;start at sector 2
+
+    int 0x13		;bios interrupt
+
+    popa
+    ret
+
diff --git a/boot/print_string_16.asm b/boot/print_string_16.asm
new file mode 100644
index 0000000..5d8ad5c
--- /dev/null
+++ b/boot/print_string_16.asm
@@ -0,0 +1,28 @@
+[bits 16]
+
+;print_string routine ([bx])
+;this routine will print a null terminated string at [bx] to the screen.
+print_string:
+
+    pusha			;push all registers
+    mov ah,0x0e
+
+    print_string_loop:
+
+	;check if value at [bx] is "\0" (end of string)
+	mov cl,[bx]
+	cmp cl,0
+	je print_string_finish
+
+	;otherwise instruct BIOS to print the current char
+	mov al,cl
+	int 0x10
+
+	;proceed with next char
+        inc bx
+	jmp print_string_loop
+
+    print_string_finish:
+
+    popa			;pop all registers
+    ret				;return to caller
-- 
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