From 467e19b262d435f1820539bc0c85ed4fa31b9687 Mon Sep 17 00:00:00 2001
From: Michal Idziorek <m.i@gmx.at>
Date: Thu, 4 Sep 2014 23:38:33 +0200
Subject: Finally we have a 2 stage bootloader !

This one can load the ramdis up to 0xfffff  :)
---
 boot0/disk_load_16.asm | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 boot0/disk_load_16.asm

(limited to 'boot0/disk_load_16.asm')

diff --git a/boot0/disk_load_16.asm b/boot0/disk_load_16.asm
new file mode 100644
index 0000000..55ad4aa
--- /dev/null
+++ b/boot0/disk_load_16.asm
@@ -0,0 +1,78 @@
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;;;;;; Miguel's FoolOS Helper Functions ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;
+;disk_load_16
+;
+
+
+[bits 16]
+
+STR_LBA:
+    db "\nLBA Support Detected (no support yet)",0
+    
+STR_CHS
+    db "CHS Support Detected",0
+
+STR_ERROR
+    db "Disk Read Error",0
+
+STR_DONE
+    db "Stage 2 Loaded",0
+
+disk_load_16:
+
+    pusha
+    
+   ; check if LBA is supported
+    mov    ah,0x41
+    mov    bx,0x55aa
+    int    0x13                                                    
+    jnc disk_load_lba
+    jmp disk_load_chs
+
+
+disk_load_lba:
+
+    mov bx, STR_LBA
+    call print_string
+    call print_nextline
+    jmp $
+    jmp disk_load_finish
+
+disk_load_chs:
+
+    mov bx, STR_CHS
+    call print_string
+    call print_nextline
+
+    mov bx,0		;target es:bx
+    mov es,bx
+    mov bx,0x7e00
+
+    mov al,50		;number of sectors to read
+    mov ah,0x02		;BIOS read sector func
+
+    mov cl,2 ; sector
+    mov ch,0 ; cylinder
+
+    mov dl,[BOOT_DRIVE]
+    mov dh,0 ;head
+
+    int 0x13		;bios interrupt
+
+    jnc disk_load_finish  
+
+    jmp $
+
+disk_load_finish:
+
+    call print_nextline
+    mov bx, STR_DONE
+    call print_string
+    call print_nextline
+
+
+    popa
+    ret
+   
-- 
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