FLATPTR_TO_SEG(BUILD_LOWRAM_END - EBDA_SIZE_START*1024)
// Accessor functions
-static inline u16 get_ebda_seg() {
+static inline u16 get_ebda_seg(void) {
return GET_BDA(ebda_seg);
}
static inline struct extended_bios_data_area_s *
-get_ebda_ptr()
+get_ebda_ptr(void)
{
ASSERT32FLAT();
return MAKE_FLATPTR(get_ebda_seg(), 0);
* Global variables
****************************************************************/
+#if MODE16 == 0 && MODESEGMENT == 1
+// In 32bit segmented mode %cs may not be readable and the code may be
+// relocated. The entry code sets up %gs with a readable segment and
+// the code offset can be determined by get_global_offset().
+#define GLOBAL_SEGREG GS
+static inline u32 __attribute_const get_global_offset(void) {
+ u32 ret;
+ asm(" calll 1f\n"
+ "1:popl %0\n"
+ " subl $1b, %0"
+ : "=r"(ret));
+ return ret;
+}
+#else
#define GLOBAL_SEGREG CS
-static inline u16 get_global_seg() {
+static inline u32 __attribute_const get_global_offset(void) {
+ return 0;
+}
+#endif
+static inline u16 get_global_seg(void) {
return GET_SEG(GLOBAL_SEGREG);
}
-#define GET_GLOBAL(var) \
- GET_VAR(GLOBAL_SEGREG, (var))
+#define GET_GLOBAL(var) \
+ GET_VAR(GLOBAL_SEGREG, *(typeof(&(var)))((void*)&(var) \
+ + get_global_offset()))
#define SET_GLOBAL(var, val) do { \
ASSERT32FLAT(); \
(var) = (val); \