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boot32, boot32lb: mark magic offsets with macro

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This commit is contained in:
E. C. Masloch 2024-02-07 00:18:22 +01:00 committed by Kenneth J Davis
parent d9b0615ad5
commit 9783ac97e0
3 changed files with 19 additions and 3 deletions
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7
boot/boot32.asm
View File

@ -28,6 +28,10 @@
;%define MULTI_SEC_READ 1
; NOTE: sys must be updated if magic offsets change
%assign ISFAT1216DUAL 0
%include "magic.mac"
segment .text
@ -96,12 +100,14 @@ real_start: cld
jmp word 0x1FE0:cont
loadseg_off dw 0
magicoffset "loadseg", 78h
loadseg_seg dw LOADSEG
cont: mov ds, ax
mov ss, ax
lea sp, [bp-0x20]
sti
magicoffset "set unit", 82h
mov [drive], dl ; BIOS passes drive number in DL
; call print
@ -401,6 +407,7 @@ no_incr_es:
times 0x01f1-$+$$ db 0
magicoffset "kernel name", 1F1h
filename db "KERNEL SYS",0,0
sign dw 0xAA55

11
boot/boot32lb.asm
View File

@ -53,6 +53,11 @@
; We support values between 0x60 and 0x200 here, with file size
; of up to 128 KiB (rounded to cluster size). Default is 0x60.
; NOTE: sys must be updated if magic offsets change
%assign ISFAT1216DUAL 0
%include "magic.mac"
segment .text
org 0x7c00 ; this is a boot sector
@ -129,7 +134,9 @@ real_start: cld
rep movsw ; move boot code to the 0x1FE0:0x0000
jmp word 0x1FE0:cont
loadseg_off dw 0, LOADSEG
loadseg_off dw 0
magicoffset "loadseg", 78h
dw LOADSEG
; -------------
@ -137,6 +144,7 @@ cont: mov ds, ax
mov ss, ax ; stack and BP-relative moves up, too
lea sp, [bp-0x20]
sti
magicoffset "set unit", 82h
mov [drive], dl ; BIOS passes drive number in DL
%ifndef QUIET
@ -413,6 +421,7 @@ msg_BootError db "No "
; currently, only "kernel.sys not found" gives a message,
; but read errors in data or root or fat sectors do not.
magicoffset "kernel name", 1F1h
filename db "KERNEL SYS"
sign dw 0, 0xAA55

4
boot/makefile
View File

@ -13,10 +13,10 @@ fat12com.bin: boot.asm magic.mac
fat16com.bin: boot.asm magic.mac
$(NASM) -dISFAT16 $(NASMBOOTFLAGS) boot.asm -l$*.lst -ofat16com.bin
fat32chs.bin: boot32.asm
fat32chs.bin: boot32.asm magic.mac
$(NASM) $(NASMBOOTFLAGS) boot32.asm -l$*.lst -ofat32chs.bin
fat32lba.bin: boot32lb.asm
fat32lba.bin: boot32lb.asm magic.mac
$(NASM) $(NASMBOOTFLAGS) boot32lb.asm -l$*.lst -ofat32lba.bin
oemfat12.bin: oemboot.asm