From b75c10c9d8c7405ba2f89724b485154d5201c404 Mon Sep 17 00:00:00 2001
From: Michal Idziorek <m.i@gmx.at>
Date: Fri, 5 Sep 2014 02:36:33 +0200
Subject: working on bootloaders (lba)

---
 boot0/disk_load_16.asm | 44 ++++++++++++++++++++++++++++++++++++--------
 boot0/mbr.asm          | 28 ++++++++++++++++++++++++----
 2 files changed, 60 insertions(+), 12 deletions(-)

(limited to 'boot0')

diff --git a/boot0/disk_load_16.asm b/boot0/disk_load_16.asm
index 55ad4aa..6762469 100644
--- a/boot0/disk_load_16.asm
+++ b/boot0/disk_load_16.asm
@@ -9,15 +9,15 @@
 [bits 16]
 
 STR_LBA:
-    db "\nLBA Support Detected (no support yet)",0
+    db "LBA Support Detected",0
     
-STR_CHS
+STR_CHS:
     db "CHS Support Detected",0
 
-STR_ERROR
+STR_ERROR:
     db "Disk Read Error",0
 
-STR_DONE
+STR_DONE:
     db "Stage 2 Loaded",0
 
 disk_load_16:
@@ -31,14 +31,23 @@ disk_load_16:
     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
+
+    mov dl,[BOOT_DRIVE]
+    xor ah,ah
+    mov ah,0x42
+
+    mov bx,0
+    mov ds,bx
+    lea si,[lba_adr]        
+
+    int 0x13  
+    jnc disk_load_finish
+    jmp disk_load_error
 
 disk_load_chs:
 
@@ -63,6 +72,12 @@ disk_load_chs:
 
     jnc disk_load_finish  
 
+disk_load_error:
+
+    call print_nextline
+    mov bx, STR_ERROR
+    call print_string
+    call print_nextline
     jmp $
 
 disk_load_finish:
@@ -75,4 +90,17 @@ disk_load_finish:
 
     popa
     ret
-   
+  
+
+;; here we hold the lba addr
+lba_adr:
+
+    dw 0x10	    ; size of packet ( 16 byte)
+    dw 16	    ; number of sectors to read
+
+    ; target is 0x7e00
+    dw 0x7e00	    ; target addr. offset
+    dw 0x0000	    ; target addr. sector
+
+    dd 1	    ; first sector to read
+    dd 0 
diff --git a/boot0/mbr.asm b/boot0/mbr.asm
index d24bbfe..9f5a51d 100644
--- a/boot0/mbr.asm
+++ b/boot0/mbr.asm
@@ -11,11 +11,14 @@
 jmp stage1
 
 STR_1:
-    db "Starting Fool Loader Stage 1. v0.1",0
+    db "Fool Loader Stage 1. v0.1",0
 
 STR_2:
     db "Starting Stage 2",0
 
+STR_BOOT:
+    db "boot drive: ",0
+
 BOOT_DRIVE:
     db 0xff ; remember the bootdrive here
 
@@ -24,23 +27,40 @@ BOOT_DRIVE:
 
 stage1:
 
+    ;remember BOOT_DRIVE (as was set by BIOS)
+    mov [BOOT_DRIVE],dl	
+
     ;first of allsetup the stack (Right under mbr)
     ;guaranteed ~30KB space
     mov bp,0x07bff
     mov sp,bp
-    
-    ;remember BOOT_DRIVE (as was set by BIOS)
-    mov [BOOT_DRIVE],dl	
 
+    call print_clear
+    call print_nextline
+    
+    ;pr message
     mov bx, STR_1
     call print_string
     call print_nextline
 
+    ;show bootdrive
+    mov bx, STR_BOOT
+    call print_string
+
+    mov al,[BOOT_DRIVE]
+    call print_hex_byte
+    call print_nextline
+
+
     call disk_load_16	; loads stage 2
 
+    ;entering stage2 message
     mov bx, STR_2
     call print_string
     call print_nextline
+
+    call print_nextline
+    mov dl,[BOOT_DRIVE]
     jmp 0x7e00 ; jump to next sector where we put stage 2
 
 ;fill partition table (4x16byte) with zeroes. 
-- 
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