Restructure kernel to use 1-segment COM convention

boot/kernel.asm

@@ -1,107 +0,0 @@
-		cpu 8086
-		org 0x0700
-
-%include	"inc/bpb.asm"
-%include	"inc/mbr.asm"
-%include	"inc/dpt.asm"
-
-init:		cli
-		xor ax, ax
-		mov ds, ax
-		mov es, ax
-		mov ss, ax
-		mov sp, ax
-
-		mov si, 0x7C00
-		; relocate to 00700
-		mov di, text_start
-		mov cx, text_length + rodata_length + data_length
-		rep movsb
-		; clear out bss section
-		mov cx, bss_length
-		rep stosb
-		; jump to copy
-		call 0:relinit
-
-section .rodata
-
-%define V 0x %+ VERSION
-version:	dd V
-
-section .text
-
-relinit:	; print banner
-		push word [version]
-		push word [version+2]
-		call printf
-		db "RDOS ",2,2, 0x0A, 0x0D, 0
-		; initialize the disk i/o
-		call dinit
-		; init 21h vector
-		mov word [0x21*4], int21
-		mov word [0x21*4+2], cs
-		; set current PSP, directly after us
-		mov ax, stack
-		mov cl, 4
-		shr ax, cl
-		mov word [curpsp], ax
-		; also the DTA
-		mov bx, dta
-		call setdta
-		; set current drive to boot drive
-		mov al, dl
-		rol al, 1
-		rol al, 1
-		or dl, al
-		and dl, 3
-		call setdd
-
-		mov bx, testfcb
-		call fndfst
-
-restart:
-hlt:		hlt
-		jmp hlt
-
-%include	"kernel/psp.asm"
-%include	"kernel/syscall.asm"
-%include	"kernel/char.asm"
-%include	"kernel/fcb.asm"
-%include	"kernel/drive.asm"
-%include	"kernel/printf.asm"
-
-section .bss
-
-dta:		resb 128
-
-section .data
-
-testfcb:	db 0
-		db "HELLO   ", "COM"
-		times 30 db 0
-
-section .text
-
-text_start	equ  $$
-text_length	equ  $-$$
-
-section .rodata
-
-rodata_start	equ  $$
-rodata_length	equ  $-$$
-
-section .data
-
-data_start	equ  $$
-data_length	equ  $-$$
-
-section .bss
-
-		resw 256 ; 512b kern stack
-		alignb 16
-stack:		; stack grows into this ^
-		; this is also the end marker
-		; programs with their psp start here
-
-bss_start	equ  $$
-bss_length	equ  $-$$