1 files changed, 103 insertions, 0 deletions
diff --git a/xxx/boot1/disk_load_16.asm b/xxx/boot1/disk_load_16.asm
new file mode 100644
index 0000000..6d1e4b3
--- /dev/null
+++ b/xxx/boot1/disk_load_16.asm
@@ -0,0 +1,103 @@
+;
+;disk_load_16
+;
+
+[bits 16]
+
+STR_LBA:
+    db "LBA Support Detected",0
+    
+STR_CHS:
+    db "No CHS Support!)",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
+
+    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:
+
+    mov bx, STR_CHS
+    call print_string
+    call print_nextline
+    jmp $
+
+    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  
+
+disk_load_error:
+
+    call print_nextline
+    mov bx, STR_ERROR
+    call print_string
+    call print_nextline
+    jmp $
+
+disk_load_finish:
+
+    call print_nextline
+    mov bx, STR_DONE
+    call print_string
+    call print_nextline
+
+
+    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