From 4ae6f22249fc91577c586eb3e5b6b410120e5fd2 Mon Sep 17 00:00:00 2001
From: "E. C. Masloch" <pushbx@ulukai.org>
Date: Tue, 6 Feb 2024 23:58:10 +0100
Subject: [PATCH] sys, boot: mark additional magic offsets
---
boot/boot.asm | 3 +++
sys/sys.c | 1 +
2 files changed, 4 insertions(+)
diff --git a/boot/boot.asm b/boot/boot.asm
index 6b94d48..a52bb52 100644
--- a/boot/boot.asm
+++ b/boot/boot.asm
@@ -264,6 +264,7 @@ real_start:
jmp word 0x1FE0:cont
loadseg_off dw 0
+ magicoffset "loadseg", 5Ch, 5Ch
loadseg_seg dw LOADSEG
cont:
@@ -276,6 +277,7 @@ cont:
; in DL, however we work around this in SYS.COM by NOP'ing out the use of DL
; (formerly we checked for [drive]==0xff; update sys.c if code moves)
;
+ magicoffset "set unit", 66h, 66h
mov [drive], dl ; rely on BIOS drive number in DL
mov LBA_SIZE, 10h
@@ -616,6 +618,7 @@ do_int13_read:
times 0x01f1-$+$$ db 0
+ magicoffset "kernel name", 1F1h, 1F1h
filename db "KERNEL SYS",0,0
sign dw 0xAA55
diff --git a/sys/sys.c b/sys/sys.c
index eb6d0dc..3cffcc6 100644
--- a/sys/sys.c
+++ b/sys/sys.c
@@ -1762,6 +1762,7 @@ void put_boot(SYSOptions *opts)
{
int i = 0;
+ /* magic offset: (first) kernel filename */
memset(&newboot[0x1f1], ' ', 11);
while (opts->kernel.kernel[i] && opts->kernel.kernel[i] != '.')
{