Changeset 65640fef in mainline for arch/amd64/src/boot/boot.S

Timestamp:

2006-02-07T09:30:23Z (19 years ago)

Author:

Ondrej Palkovsky <ondrap@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

fa2d382

Parents:

37b451f7

Message:

I'm unsure if simics is broken or the only one according to spec,
but SYSCALL now works even with simics.

File:

• arch/amd64/src/boot/boot.S (modified) (1 diff)

arch/amd64/src/boot/boot.S

@@ -59 +59 @@
         movw $gdtselector(KDATA_DES), %cx
         movw %cx, %es
-        movw %cx, %gs
-        movw %cx, %fs
         movw %cx, %ds                                                   # kernel data + stack
         movw %cx, %ss
+        # Simics seems to remove hidden part of GS on entering user mode
+        #  when _visible_ part of GS does not point to user-mode segment
+        movw $gdtselector(UDATA_DES), %cx
+        movw %cx, %fs
+        movw %cx, %gs
         
         jmpl $gdtselector(KTEXT32_DES), $multiboot_meeting_point