[PATCH 1/2] x86/idt: split out idt routines

[Pingfan Liu]

Some idt routines can be reused in early boot stage. Splitting them out.

Signed-off-by: Pingfan Liu <kernelfans@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Cao jin <caoj.fnst@xxxxxxxxxxxxxx>
Cc: Wei Huang <wei@xxxxxxxxxx>
Cc: Chao Fan <fanc.fnst@xxxxxxxxxxxxxx>
Cc: Nicolai Stange <nstange@xxxxxxx>
Cc: Dou Liyang <douly.fnst@xxxxxxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
 arch/x86/include/asm/idt.h | 64 ++++++++++++++++++++++++++++++++++++++++++++++
 arch/x86/kernel/idt.c      | 58 +----------------------------------------
 2 files changed, 65 insertions(+), 57 deletions(-)
 create mode 100644 arch/x86/include/asm/idt.h

diff --git a/arch/x86/include/asm/idt.h b/arch/x86/include/asm/idt.h
new file mode 100644
index 0000000..147f128
--- /dev/null
+++ b/arch/x86/include/asm/idt.h
@@ -0,0 +1,64 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_IDT_H
+#define _ASM_X86_IDT_H
+
+#include <asm/desc_defs.h>
+
+struct idt_data {
+	unsigned int	vector;
+	unsigned int	segment;
+	struct idt_bits	bits;
+	const void	*addr;
+};
+
+#define DPL0		0x0
+#define DPL3		0x3
+
+#define DEFAULT_STACK	0
+
+#define G(_vector, _addr, _ist, _type, _dpl, _segment)	\
+	{						\
+		.vector		= _vector,		\
+		.bits.ist	= _ist,			\
+		.bits.type	= _type,		\
+		.bits.dpl	= _dpl,			\
+		.bits.p		= 1,			\
+		.addr		= _addr,		\
+		.segment	= _segment,		\
+	}
+
+/* Interrupt gate */
+#define INTG(_vector, _addr)				\
+	G(_vector, _addr, DEFAULT_STACK, GATE_INTERRUPT, DPL0, __KERNEL_CS)
+
+/* System interrupt gate */
+#define SYSG(_vector, _addr)				\
+	G(_vector, _addr, DEFAULT_STACK, GATE_INTERRUPT, DPL3, __KERNEL_CS)
+
+/* Interrupt gate with interrupt stack */
+#define ISTG(_vector, _addr, _ist)			\
+	G(_vector, _addr, _ist, GATE_INTERRUPT, DPL0, __KERNEL_CS)
+
+/* System interrupt gate with interrupt stack */
+#define SISTG(_vector, _addr, _ist)			\
+	G(_vector, _addr, _ist, GATE_INTERRUPT, DPL3, __KERNEL_CS)
+
+/* Task gate */
+#define TSKG(_vector, _gdt)				\
+	G(_vector, NULL, DEFAULT_STACK, GATE_TASK, DPL0, _gdt << 3)
+
+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
+}
+
+#endif
diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c
index 01adea2..80b811a 100644
--- a/arch/x86/kernel/idt.c
+++ b/arch/x86/kernel/idt.c
@@ -9,49 +9,7 @@
 #include <asm/proto.h>
 #include <asm/desc.h>
 #include <asm/hw_irq.h>
-
-struct idt_data {
-	unsigned int	vector;
-	unsigned int	segment;
-	struct idt_bits	bits;
-	const void	*addr;
-};
-
-#define DPL0		0x0
-#define DPL3		0x3
-
-#define DEFAULT_STACK	0
-
-#define G(_vector, _addr, _ist, _type, _dpl, _segment)	\
-	{						\
-		.vector		= _vector,		\
-		.bits.ist	= _ist,			\
-		.bits.type	= _type,		\
-		.bits.dpl	= _dpl,			\
-		.bits.p		= 1,			\
-		.addr		= _addr,		\
-		.segment	= _segment,		\
-	}
-
-/* Interrupt gate */
-#define INTG(_vector, _addr)				\
-	G(_vector, _addr, DEFAULT_STACK, GATE_INTERRUPT, DPL0, __KERNEL_CS)
-
-/* System interrupt gate */
-#define SYSG(_vector, _addr)				\
-	G(_vector, _addr, DEFAULT_STACK, GATE_INTERRUPT, DPL3, __KERNEL_CS)
-
-/* Interrupt gate with interrupt stack */
-#define ISTG(_vector, _addr, _ist)			\
-	G(_vector, _addr, _ist, GATE_INTERRUPT, DPL0, __KERNEL_CS)
-
-/* System interrupt gate with interrupt stack */
-#define SISTG(_vector, _addr, _ist)			\
-	G(_vector, _addr, _ist, GATE_INTERRUPT, DPL3, __KERNEL_CS)
-
-/* Task gate */
-#define TSKG(_vector, _gdt)				\
-	G(_vector, NULL, DEFAULT_STACK, GATE_TASK, DPL0, _gdt << 3)
+#include <asm/idt.h>
 
 /*
  * Early traps running on the DEFAULT_STACK because the other interrupt
@@ -202,20 +160,6 @@ const struct desc_ptr debug_idt_descr = {
 };
 #endif
 
-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
-}
-
 static void
 idt_setup_from_table(gate_desc *idt, const struct idt_data *t, int size, bool sys)
 {
-- 
2.7.4