From 9b22a6965579ea1867aea291d910c96f386b518b Mon Sep 17 00:00:00 2001
From: Brett Weiland <brett_weiland@bpcspace.com>
Date: Tue, 24 Aug 2021 14:09:29 -0500
Subject: major backup 8.24.21

---
 src/bootloader/bootloader.asm | 95 +++++++++++++++++--------------------------
 1 file changed, 37 insertions(+), 58 deletions(-)

(limited to 'src/bootloader/bootloader.asm')

diff --git a/src/bootloader/bootloader.asm b/src/bootloader/bootloader.asm
index 3ac10f3..f912e49 100644
--- a/src/bootloader/bootloader.asm
+++ b/src/bootloader/bootloader.asm
@@ -1,11 +1,11 @@
 [bits 16]
-[extern _kernel_size]
+[extern _kernel_sector_size]
 [extern _bootloader_stage1_size]
-[extern _kernel_loc]
+[extern _kernel_s1_loc]
 
 jmp stage0 
-times 3-($-$$) db 0x90 ; a temporary dirty fix to emulate a floppy disk insted of a hard risk 
-times 59 db 0          ; (TODO support hard disks) 
+times 3-($-$$) db 0x90 
+times 59 db 0          
 
 stage0:
 
@@ -13,44 +13,49 @@ jmp 0:.entry
 .entry:
 
 mov ax, 0
-mov ds, ax
-mov bp, ax 
-
 mov ds, ax
 mov es, ax
 
-mov ax, 0x8fc0
+;stack segments
+mov ax, 0x7000
 mov ss, ax
-mov ax, 0xfffe 
+mov ax, 0xfff0 
 mov sp, ax
+mov bp, 0
 
 mov al, 0x92
 or al, 2
 out 0x92, al
 
-mov [.boot_device], dl
+
+call bios_disk.init
+
 
 mov bx, .loadstage2_msg
-mov cx, 0 
 call bios_print
 
-; TODO put in an error message and a maximum fail count
 .load_stage1:
-mov al, _bootloader_stage1_size
-mov cl, 0x2       ; read sector 2 
-mov dx, 0x0       ; dest segment 0
-mov bx, 0x7e00    ; dest offst 0 
-call bios_disk.load_sectors 
+;TODO LOAD STAGE ONE HERE
+
+; we start on 0x100000
+; esi: sector start
+; cx: sector count
+; edi: memory desination
+
+mov esi, 1      ; 2nt sector
+mov ecx, _bootloader_stage1_size
+mov edi, 0x7e00 ; desination
+call bios_disk.load_sectors_v2
+
 
 
 jmp mbr_end.entry
 
-.boot_device: db 0
 
 .loadstage2_msg: db "Loading (stage 2) bootloader...", 0
 
-%include "bootloader/bios_functions/bios_disk.asm"
-%include "bootloader/bios_functions/print.asm"
+%include "bootloader/bios_disk.asm"
+%include "bootloader/print.asm"
 
 times 510 - ($-$$) db 0  
 dw 0xaa55
@@ -66,15 +71,12 @@ boot_msg:
 
 mbr_end:
 .entry:
+cli
 ; entering unreal mode
 mov bx, boot_msg.stage2_loaded
-mov cx, 0
 call bios_print
 
 
-cli
-push ds
-
 lgdt [protected_gdt.descriptor]
 
 mov eax, cr0
@@ -83,52 +85,29 @@ mov cr0, eax
 
 jmp $+2
 
-mov bx, 0x10 ; descriptor 2, the data descriptor
-mov ds, bx   ; put it into the segment register
-mov es, bx   ; 
+mov bx, 0x10
+mov ds, bx   
+mov es, bx
 
 and al, 0xfe
 mov cr0, eax
 
-pop ds
+mov bx, 0
+mov ds, bx
+mov es, bx
 sti
 
-;we are now in unreal mode
-
-mov cl, 5   
-mov edi, _kernel_loc
-.loop:
-mov al, 0x1   ; sector count
-mov dx, 0x0   ; dest addr segment
-mov bx, 0x500 ; dest addr offset
-call bios_disk.load_sectors
-
-
-inc cl
-
-push cx
-
-mov esi, 0x500
-mov ecx, 512
-a32 rep movsb
-nop
-
-pop cx
-
-cmp cl, _kernel_size+2
-je .loop_end
-
-jmp .loop
-
-.loop_end:
+mov esi, _bootloader_stage1_size
+mov edi, 0x100000
+mov ecx, _kernel_sector_size
+call bios_disk.load_sectors_v2
 
 mov bx, boot_msg.kernel_loaded
-mov cx, 0
 call bios_print
 
 
 call detect_arch
-call vbe_init
+;call vbe_init
 done:
 
 call enter_longmode
-- 
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