+/*
+ * The transient stack for sysenter.
+ * At its top is a 32-bit link to the PCB in legacy mode, 64-bit otherwise.
+ * NB: it also must be large enough to contain a interrupt stack frame
+ * due to a single-step trace trap at system call entry.
+ */
+struct sysenter_stack master_sstk
+ __attribute__ ((section ("__DESC, master_sstk")))
+ __attribute__ ((aligned (16))) = { {0}, 0 };
+
+#ifdef X86_64
+struct x86_64_tss master_ktss64 __attribute__ ((aligned (4096))) = {
+ .io_bit_map_offset = 0x0FFF,
+};
+#endif /* X86_64 */
+
+/*
+ * Task structure for double-fault handler:
+ */
+struct i386_tss master_dftss
+ __attribute__ ((section ("__DESC, master_dftss")))
+ __attribute__ ((aligned (4096))) = {
+ 0, /* back link */
+ (int) &df_task_stack_end - 4, /* esp0 */
+ KERNEL_DS, /* ss0 */
+ 0, /* esp1 */
+ 0, /* ss1 */
+ 0, /* esp2 */
+ 0, /* ss2 */
+ 0, /* cr3 */
+ (int) &df_task_start, /* eip */
+ 0, /* eflags */
+ 0, /* eax */
+ 0, /* ecx */
+ 0, /* edx */
+ 0, /* ebx */
+ (int) &df_task_stack_end - 4, /* esp */
+ 0, /* ebp */
+ 0, /* esi */
+ 0, /* edi */
+ KERNEL_DS, /* es */
+ KERNEL_CS, /* cs */
+ KERNEL_DS, /* ss */
+ KERNEL_DS, /* ds */
+ KERNEL_DS, /* fs */
+ CPU_DATA_GS, /* gs */
+ KERNEL_LDT, /* ldt */
+ 0, /* trace_trap */
+ 0x0FFF /* IO bitmap offset -
+ beyond end of TSS segment,
+ so no bitmap */
+};
+
+
+/*
+ * Task structure for machine_check handler:
+ */
+struct i386_tss master_mctss
+ __attribute__ ((section ("__DESC, master_mctss")))
+ __attribute__ ((aligned (4096))) = {
+ 0, /* back link */
+ (int) &mc_task_stack_end - 4, /* esp0 */
+ KERNEL_DS, /* ss0 */
+ 0, /* esp1 */
+ 0, /* ss1 */
+ 0, /* esp2 */
+ 0, /* ss2 */
+ 0, /* cr3 */
+ (int) &mc_task_start, /* eip */
+ 0, /* eflags */
+ 0, /* eax */
+ 0, /* ecx */
+ 0, /* edx */
+ 0, /* ebx */
+ (int) &mc_task_stack_end - 4, /* esp */
+ 0, /* ebp */
+ 0, /* esi */
+ 0, /* edi */
+ KERNEL_DS, /* es */
+ KERNEL_CS, /* cs */
+ KERNEL_DS, /* ss */
+ KERNEL_DS, /* ds */
+ KERNEL_DS, /* fs */
+ CPU_DATA_GS, /* gs */
+ KERNEL_LDT, /* ldt */
+ 0, /* trace_trap */
+ 0x0FFF /* IO bitmap offset -
+ beyond end of TSS segment,
+ so no bitmap */
+};
+