set ds/es to a tiny memory model after entering Unreal mode

ss/fs/gs will all be huge/flat model after
2025-09-05 15:43:22 -04:00
parent b9b3e92632
commit b5ae11f850
2 changed files with 8 additions and 2 deletions
--- a/src/stage2/stage2.nasm
+++ b/src/stage2/stage2.nasm
@@ -162,6 +162,12 @@ main:

    ; enter unreal mode (16 bit code, 32 bit flat memory model)
    call EnterUnrealMode
+
+    ; set ds, es to the STAGE2_SEGMENT, for our model (generally) ds == es == cs
+    ; fs, gs & ss are all still huge data model, and the macro "__REFLAT_DS_ES" exists
+    ; to easily access data outside of 64KiB boundries using ds/es addressing
+    __TINY_DS_ES
+
    print_string UnrealMode_OK_info

    ; FAT Driver setup