Avoid code addresses >64K in big real mode.

Kvm has some limitations with code addresses in big real mode, so
avoid doing that.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/misc.c b/src/misc.c
index 354df87..108c332 100644
--- a/src/misc.c
+++ b/src/misc.c
@@ -156,8 +156,8 @@ u64 rombios32_gdt[] VAR16VISIBLE __aligned(8) = {
     GDT_LIMIT(BUILD_BIOS_SIZE-1) | GDT_CODE | GDT_BASE(BUILD_BIOS_ADDR),
     // 16 bit data segment base=0x0 limit=0xffff (SEG32_MODE16_DS)
     GDT_LIMIT(0x0ffff) | GDT_DATA,
-    // 16 bit code segment base=0 limit=0xffffffff (SEG32_MODE16BIG_CS)
-    GDT_LIMIT(0xfffff) | GDT_CODE | GDT_G,
+    // 16 bit code segment base=0xf0000 limit=0xffffffff (SEG32_MODE16BIG_CS)
+    GDT_LIMIT(0xfffff) | GDT_CODE | GDT_G | GDT_BASE(BUILD_BIOS_ADDR),
     // 16 bit data segment base=0 limit=0xffffffff (SEG32_MODE16BIG_DS)
     GDT_LIMIT(0xfffff) | GDT_DATA | GDT_G,
 };