commit c67256787e2754cf1ec940a3777018723c45e497
parent 19e1a34d5f5524ce8c6d818c49dfdebf11685575
Author: Stefan <misc@stefan-koch.name>
Date: Sat, 10 Oct 2015 23:08:20 +0200
jump to protected mode and display character P
Diffstat:
7 files changed, 402 insertions(+), 17 deletions(-)
diff --git a/.gitignore b/.gitignore
@@ -28,6 +28,7 @@
*.x86_64
*.hex
*.bin
+*.img
# Debug files
*.dSYM/
diff --git a/Makefile b/Makefile
@@ -3,6 +3,13 @@ ASMFLAGS =
all: $(ASM_FILES)
$(ASM) $(ASMFLAGS) boot.asm -o boot.bin
+ $(ASM) $(ASMFLAGS) kernel.asm -o kernel.bin
+
+ dd if=/dev/zero of=sos.img bs=1k count=1440
+ cat boot.bin kernel.bin > /tmp/sos.bin
+ dd status=noxfer conv=notrunc if=/tmp/sos.bin of=sos.img
clean:
rm boot.bin
+ rm kernel.bin
+ rm sos.img
diff --git a/bochsrc b/bochsrc
@@ -1,6 +1,6 @@
romimage: file="$HOME/opt/bochs/share/bochs/BIOS-bochs-latest"
vgaromimage: file="$HOME/opt/bochs/share/bochs/VGABIOS-elpin-2.40"
boot: floppy
-floppya: 1_44="boot.bin", status=inserted
+floppya: 1_44="sos.img", status=inserted
cpu: count=1, ips=4000000, reset_on_triple_fault=0
magic_break: enabled=1
diff --git a/boot.asm b/boot.asm
@@ -6,23 +6,23 @@ mov ss, ax
mov ds, ax
mov es, ax
-mov si, welcome_msg
-call print_string
+disk_reset:
+ xor ah, ah ; ah=0, reset drive head
+ int 13h
+ jc disk_reset
-jmp $
+disk_read:
+ mov ah, 0x02 ; with interrupt 3h: reading!
+ mov al, 10 ; read 10 sectors
+ mov cl, 2 ; from sector 2
+ mov bx, 0x8000 ; save data to location 0x8000
-print_string:
- mov ah, 0eh ; output with interrupt 10h
-.next_char:
- lodsb ; reads one bytes and saves it to AL
- cmp al, 0 ; was the nullbyte read?
- je .done ; if yes: finished
- int 10h ; otherwise: show current character from AL
- jmp .next_char ; and go on with next char
-.done:
- ret
+ mov ch, 0
+ mov dh, 0
+ int 13h
+ jc disk_read
-welcome_msg db 'Hello World!', 0
+ jmp 0x0000:0x8000 ; jump to the new program, hooray
-times 510-($-$$) hlt
-dw 0xAA55
+times 510-($-$$) db 0
+dw 0xaa55
diff --git a/images/gdt.png b/images/gdt.png
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diff --git a/images/gdt.svg b/images/gdt.svg
@@ -0,0 +1,322 @@
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diff --git a/kernel.asm b/kernel.asm
@@ -0,0 +1,55 @@
+[BITS 16]
+[ORG 0x8000]
+
+xor ax, ax ; set ax to 0 = first segment
+mov ss, ax
+mov ds, ax
+mov es, ax
+
+enter_pmode:
+ cli
+ lgdt [gdtr]
+ mov eax, cr0
+ or eax, 1
+ mov cr0, eax
+
+ jmp 08h:far_jump
+
+[BITS 32]
+far_jump:
+ mov ax, 10h
+ mov ds, ax
+ mov ss, ax
+ mov esp, 090000h
+ mov byte [ds:0B8000h], 'P'
+ mov byte [ds:0B8001h], 1Bh
+
+hang:
+ jmp hang
+
+gdt_null: ; the first element is the so called null descriptor
+ dd 0 ; it is not referenced by the processor
+ dd 0
+
+gdt_code: ; usually we want at least one segment descriptor for code
+ dw 0ffffh ; segment length bits 0-15
+ dw 0 ; segment base byte 0,1
+ db 0 ; segment base byte 2
+ db 10011010b ; access rights
+ db 11001111b ; bit 7-4: 4 flag bits: granularity, default operation
+ ; size bit, 2 bits available for OS
+ ; bit 3-0: segment length bits 16-19
+ db 0 ; segment base byte 3
+
+gdt_data: ; usually we want at least one segment descriptor for data
+ dw 0ffffh
+ dw 0
+ db 0
+ db 10010010b
+ db 11001111b
+ db 0
+gdt_end:
+
+gdtr:
+ dw gdt_end - gdt_null - 1 ; 2 bytes are the size of the GDT in bytes - 1
+ dd gdt_null ; 4 bytes are the address of the GDT start
