1 files changed, 48 insertions, 4 deletions

diff --git a/arch/x86/include/asm/desc.h b/arch/x86/include/asm/desc.h
index 1ced11d31932..ec95fe44fa3a 100644
--- a/arch/x86/include/asm/desc.h
+++ b/arch/x86/include/asm/desc.h
@@ -9,6 +9,7 @@
 #include <asm/irq_vectors.h>
 #include <asm/cpu_entry_area.h>
 
+#include <linux/debug_locks.h>
 #include <linux/smp.h>
 #include <linux/percpu.h>
 
@@ -224,6 +225,26 @@ static inline void store_idt(struct desc_ptr *dtr)
 	asm volatile("sidt %0":"=m" (*dtr));
 }
 
+static inline void native_gdt_invalidate(void)
+{
+	const struct desc_ptr invalid_gdt = {
+		.address = 0,
+		.size = 0
+	};
+
+	native_load_gdt(&invalid_gdt);
+}
+
+static inline void native_idt_invalidate(void)
+{
+	const struct desc_ptr invalid_idt = {
+		.address = 0,
+		.size = 0
+	};
+
+	native_load_idt(&invalid_idt);
+}
+
 /*
  * The LTR instruction marks the TSS GDT entry as busy. On 64-bit, the GDT is
  * a read-only remapping. To prevent a page fault, the GDT is switched to the
@@ -381,7 +402,32 @@ static inline void set_desc_limit(struct desc_struct *desc, unsigned long limit)
 	desc->limit1 = (limit >> 16) & 0xf;
 }
 
-void alloc_intr_gate(unsigned int n, const void *addr);
+static inline void init_idt_data(struct idt_data *data, unsigned int n,
+				 const void *addr)
+{
+	BUG_ON(n > 0xFF);
+
+	memset(data, 0, sizeof(*data));
+	data->vector	= n;
+	data->addr	= addr;
+	data->segment	= __KERNEL_CS;
+	data->bits.type	= GATE_INTERRUPT;
+	data->bits.p	= 1;
+}
+
+static inline void idt_init_desc(gate_desc *gate, const struct idt_data *d)
+{
+	unsigned long addr = (unsigned long) d->addr;
+
+	gate->offset_low	= (u16) addr;
+	gate->segment		= (u16) d->segment;
+	gate->bits		= d->bits;
+	gate->offset_middle	= (u16) (addr >> 16);
+#ifdef CONFIG_X86_64
+	gate->offset_high	= (u32) (addr >> 32);
+	gate->reserved		= 0;
+#endif
+}
 
 extern unsigned long system_vectors[];
 
@@ -394,12 +440,10 @@ extern bool idt_is_f00f_address(unsigned long address);
 
 #ifdef CONFIG_X86_64
 extern void idt_setup_early_pf(void);
-extern void idt_setup_ist_traps(void);
 #else
 static inline void idt_setup_early_pf(void) { }
-static inline void idt_setup_ist_traps(void) { }
 #endif
 
-extern void idt_invalidate(void *addr);
+extern void idt_invalidate(void);
 
 #endif /* _ASM_X86_DESC_H */