From 0df1a4af55ae07bcade9b094b42f9bac42d5c98b Mon Sep 17 00:00:00 2001
From: Stas Sergeev <stsp2@yandex.ru>
Date: Fri, 1 Dec 2023 01:12:02 +0500
Subject: [PATCH] kernel: move HMA fillers to HMA_TEXT_START

This avoids the need for the kernel.o to be linked before other
objects. It also wastes ~200 bytes of HMA, but we have no shortage
of the HMA space.
---
 kernel/kernel.asm | 22 +++++++---------------
 1 file changed, 7 insertions(+), 15 deletions(-)

diff --git a/kernel/kernel.asm b/kernel/kernel.asm
index 95cb75a8..5e919ff2 100644
--- a/kernel/kernel.asm
+++ b/kernel/kernel.asm
@@ -735,6 +735,7 @@ segment DYN_DATA
         align 10h
         global _Dyn
 _Dyn:
+                times 10h db 0      ; guard space from prev sym
 
 markEndInstanceData:  ; mark end of DOS data seg we say needs instancing
 
@@ -759,21 +760,16 @@ _InitEnd:
 
 segment HMA_TEXT_START
                 align 10h
-                times 10h db 0      ; guard space from prev sym
-                global __HMATextAvailable
-__HMATextAvailable:
                 global  __HMATextStart
 __HMATextStart:
+                times 0xd0 db 0   ; filler [ffff:0..10000:c0]
+                ; reserve space for far jump to cp/m routine
+                times 5 db 0
+                align 10h
+                global __HMATextAvailable
+__HMATextAvailable:
 
-;
-; the HMA area is filled with 1eh+3(=sizeof VDISK) = 33 byte dummy data,
-; so nothing will ever be below 0xffff:0031
-;
 segment HMA_TEXT
-begin_hma:
-                times 10h db 0   ; filler [ffff:0..ffff:10]
-                times 20h db 0
-                db 0
 
 ; to minimize relocations
                 global _DGROUP_
@@ -791,10 +787,6 @@ __U4D:
                 LDIVMODU
 %endif
 
-                times 0xd0 - ($-begin_hma) db 0
-                ; reserve space for far jump to cp/m routine
-                times 5 db 0
-
 ;End of HMA segment
 segment HMA_TEXT_END
                 global  __HMATextEnd