X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/13fec9890cf095cc781fdf7b8917cb03bf32dd4c..c0fea4742e91338fffdcf79f86a7c1d5e2b97eb1:/osfmk/i386/ktss.c

diff --git a/osfmk/i386/ktss.c b/osfmk/i386/ktss.c
index 23a39df8f..24d031229 100644
--- a/osfmk/i386/ktss.c
+++ b/osfmk/i386/ktss.c
@@ -56,13 +56,14 @@
  * We don't use the i386 task switch mechanism.  We need a TSS
  * only to hold the kernel stack pointer for the current thread.
  *
- * XXX multiprocessor??
  */
 #include <i386/tss.h>
 #include <i386/seg.h>
 #include <mach_kdb.h>
 
-struct i386_tss	ktss = {
+struct i386_tss	master_ktss
+	__attribute__ ((section ("__DESC, master_ktss")))
+	__attribute__ ((aligned (4096))) = {
 	0,				/* back link */
 	0,				/* esp0 */
 	KERNEL_DS,			/* ss0 */
@@ -94,9 +95,104 @@ struct i386_tss	ktss = {
 					   so no bitmap */
 };
 
+/*
+ * 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 */
+};
+
 #if	MACH_KDB
 
-struct i386_tss	dbtss = {
+struct i386_tss	master_dbtss
+	__attribute__ ((section ("__DESC, master_dbtss")))
+	__attribute__ ((aligned (4096))) = {
 	0,				/* back link */
 	0,				/* esp0 */
 	KERNEL_DS,			/* ss0 */