Commit 249e83fe authored by Avi Kivity's avatar Avi Kivity Committed by Andi Kleen
Browse files

[PATCH] x86-64: Extract segment descriptor definitions for use outside 



Code that wants to use struct desc_struct cannot do so on i386 because
desc.h contains other code that will only compile on x86_64.

So extract the structure definitions into a asm-x86_64/desc_defs.h.

Signed-off-by: default avatarAvi Kivity <avi@qumranet.com>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>

 include/asm-x86_64/desc.h      |   53 -------------------------------
 include/asm-x86_64/desc_defs.h |   69 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 70 insertions(+), 52 deletions(-)
parent 4c7aa6c3

include/asm-x86_64/desc.h

+1 −52
Original line number Diff line number Diff line
@@ -9,64 +9,13 @@ 


#include <linux/string.h>

#include <linux/smp.h>

#include <asm/desc_defs.h>



#include <asm/segment.h>

#include <asm/mmu.h>



// 8 byte segment descriptor

struct desc_struct { 

	u16 limit0;

	u16 base0;

	unsigned base1 : 8, type : 4, s : 1, dpl : 2, p : 1;

	unsigned limit : 4, avl : 1, l : 1, d : 1, g : 1, base2 : 8;

} __attribute__((packed)); 



struct n_desc_struct { 

	unsigned int a,b;

}; 	



extern struct desc_struct cpu_gdt_table[GDT_ENTRIES];



enum { 

	GATE_INTERRUPT = 0xE, 

	GATE_TRAP = 0xF, 	

	GATE_CALL = 0xC,

}; 	



// 16byte gate

struct gate_struct {          

	u16 offset_low;

	u16 segment; 

	unsigned ist : 3, zero0 : 5, type : 5, dpl : 2, p : 1;

	u16 offset_middle;

	u32 offset_high;

	u32 zero1; 

} __attribute__((packed));



#define PTR_LOW(x) ((unsigned long)(x) & 0xFFFF) 

#define PTR_MIDDLE(x) (((unsigned long)(x) >> 16) & 0xFFFF)

#define PTR_HIGH(x) ((unsigned long)(x) >> 32)



enum { 

	DESC_TSS = 0x9,

	DESC_LDT = 0x2,

}; 



// LDT or TSS descriptor in the GDT. 16 bytes.

struct ldttss_desc { 

	u16 limit0;

	u16 base0;

	unsigned base1 : 8, type : 5, dpl : 2, p : 1;

	unsigned limit1 : 4, zero0 : 3, g : 1, base2 : 8;

	u32 base3;

	u32 zero1; 

} __attribute__((packed)); 



struct desc_ptr {

	unsigned short size;

	unsigned long address;

} __attribute__((packed)) ;



#define load_TR_desc() asm volatile("ltr %w0"::"r" (GDT_ENTRY_TSS*8))

#define load_LDT_desc() asm volatile("lldt %w0"::"r" (GDT_ENTRY_LDT*8))

#define clear_LDT()  asm volatile("lldt %w0"::"r" (0))

include/asm-x86_64/desc_defs.h

0 → 100644
+69 −0
Original line number Diff line number Diff line 
/* Written 2000 by Andi Kleen */

#ifndef __ARCH_DESC_DEFS_H

#define __ARCH_DESC_DEFS_H



/*

 * Segment descriptor structure definitions, usable from both x86_64 and i386

 * archs.

 */



#ifndef __ASSEMBLY__



#include <linux/types.h>



// 8 byte segment descriptor

struct desc_struct {

	u16 limit0;

	u16 base0;

	unsigned base1 : 8, type : 4, s : 1, dpl : 2, p : 1;

	unsigned limit : 4, avl : 1, l : 1, d : 1, g : 1, base2 : 8;

} __attribute__((packed));



struct n_desc_struct {

	unsigned int a,b;

};



enum {

	GATE_INTERRUPT = 0xE,

	GATE_TRAP = 0xF,

	GATE_CALL = 0xC,

};



// 16byte gate

struct gate_struct {

	u16 offset_low;

	u16 segment;

	unsigned ist : 3, zero0 : 5, type : 5, dpl : 2, p : 1;

	u16 offset_middle;

	u32 offset_high;

	u32 zero1;

} __attribute__((packed));



#define PTR_LOW(x) ((unsigned long)(x) & 0xFFFF)

#define PTR_MIDDLE(x) (((unsigned long)(x) >> 16) & 0xFFFF)

#define PTR_HIGH(x) ((unsigned long)(x) >> 32)



enum {

	DESC_TSS = 0x9,

	DESC_LDT = 0x2,

};



// LDT or TSS descriptor in the GDT. 16 bytes.

struct ldttss_desc {

	u16 limit0;

	u16 base0;

	unsigned base1 : 8, type : 5, dpl : 2, p : 1;

	unsigned limit1 : 4, zero0 : 3, g : 1, base2 : 8;

	u32 base3;

	u32 zero1;

} __attribute__((packed));



struct desc_ptr {

	unsigned short size;

	unsigned long address;

} __attribute__((packed)) ;





#endif /* !__ASSEMBLY__ */



#endif

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