From 55b3af4989e7908472d1dbfb3fe1bdd6e43262e1 Mon Sep 17 00:00:00 2001
From: Michal Idziorek <m.i@gmx.at>
Date: Fri, 24 Oct 2014 13:59:06 +0200
Subject: moved kernel and ramimage to 0x100000 successfully

chs is broken however and only the first chunk seems to get loaded
properly :(
---
 boot/stage2.asm | 63 +++++++++++++++++++++++++++++++++++++++------------------
 1 file changed, 43 insertions(+), 20 deletions(-)

(limited to 'boot/stage2.asm')

diff --git a/boot/stage2.asm b/boot/stage2.asm
index 3fde5c1..9dd00bc 100644
--- a/boot/stage2.asm
+++ b/boot/stage2.asm
@@ -47,8 +47,15 @@ VESA_MODE_SELECT equ 0x4114
 jmp boot_16 ;start boot process
 
 ;;SOME Global Data, mainly info/error strings
+FILL:
+   times 32  db 0x66
+
 BOOT_DRIVE:
     db 0xff
+
+LOADER_TARGET:
+    dd 0x100000  ;here we will put our image
+
 KERNEL_CHUNK:
     dw 0x1
 STR_VERSION:
@@ -124,13 +131,21 @@ boot_16:
     call BiosGetMemoryMap    ; this will also put the number of entries 
 	                     ; of the memory map at MEMMAP_SIZE_OFFSET
 
-kernel_load:
     ;   Load the KERNEL Image
     mov bx, STR_LOAD
     call print_string
     call print_nextline
+
+kernel_load:
+
     call disk_load_16
 
+    ; init vesa on last iteration!
+    mov ax,[KERNEL_CHUNK]
+    cmp ax,0x5
+    jne skip_vesa_init
+        call VesaSetup
+    skip_vesa_init:
    
     call switch_to_pm
 ;
@@ -140,53 +155,61 @@ boot_32_pm:
 
     ;Fast A20 Gate:
     ;http://wiki.osdev.org/A20_Line
-    
     in al, 0x92
     or al, 2
     out 0x92, al
 
-
     ; tell the world we are protected
-    mov ebx,STR_PM
-    mov ecx,2*23*80
-    call print_string_pm
+    ;mov ebx,STR_PM
+    ;mov ecx,2*23*80
+    ;call print_string_pm
+
+    ;increment chunk number
+    mov ax,[KERNEL_CHUNK]
+    add ax,1
+    mov [KERNEL_CHUNK],ax
 
-    push edx ; persist edx for some reason!?
+    ;check if all chunkgs loaded (hardcoded to 0x6 for a start)
+    cmp ax,0x6
+    je finish_load
 
+    ; show KERNEL CHUNK value
+    push edx ; persist edx for some reason!? 
     mov edx,0
     mov dx,[KERNEL_CHUNK]
     mov ecx,2*24*80
     call print_hex_pm
+    pop edx
 
 
+	; here we actually do copy the chunk into ext mem!
+	mov eax,[LOADER_TARGET]
+	mov ebx,0x18000
 
-    ; here we should move the chunk away or stop the loop if everything loaded.
-    mov ax,[KERNEL_CHUNK]
-    add ax,1
-    mov [KERNEL_CHUNK],ax
+	copy_next_byte:
 
-	; here we should copy the chunk into ext mem!
+	    mov ecx,[ebx]
+	    mov [eax],ecx
 
+	    inc eax
+	    inc ebx
+	    cmp ebx, 0x90000
 
+	jne copy_next_byte
+	mov [LOADER_TARGET],eax ;persist next target address
 
 
     ; and now go back to real! (first 16bit protected!)
-    cmp edx,0x20
-    je finish_load
-    pop edx
-
-
-
     jmp CODE16_SEG:reinit_16
+
     finish_load:
     ;
 
-    call VesaSetup
 
     ; call kernel!
     mov eax,0		;tell the kernel 
 			; we are the booting processor
-    call 0x18000        ;jump into our Kernel!
+    call 0x100000        ;jump into our Kernel!
 
 
 [bits 16]
-- 
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