mirror of
https://github.com/KolibriOS/kolibrios.git
synced 2024-12-12 18:07:06 +03:00
125 lines
3.4 KiB
C
125 lines
3.4 KiB
C
/* Written 2000 by Andi Kleen */
|
|
#ifndef _ASM_X86_DESC_DEFS_H
|
|
#define _ASM_X86_DESC_DEFS_H
|
|
|
|
/*
|
|
* Segment descriptor structure definitions, usable from both x86_64 and i386
|
|
* archs.
|
|
*/
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#include <linux/types.h>
|
|
|
|
/*
|
|
* FIXME: Accessing the desc_struct through its fields is more elegant,
|
|
* and should be the one valid thing to do. However, a lot of open code
|
|
* still touches the a and b accessors, and doing this allow us to do it
|
|
* incrementally. We keep the signature as a struct, rather than an union,
|
|
* so we can get rid of it transparently in the future -- glommer
|
|
*/
|
|
/* 8 byte segment descriptor */
|
|
struct desc_struct {
|
|
union {
|
|
struct {
|
|
unsigned int a;
|
|
unsigned int b;
|
|
};
|
|
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));
|
|
|
|
#define GDT_ENTRY_INIT(flags, base, limit) { { { \
|
|
.a = ((limit) & 0xffff) | (((base) & 0xffff) << 16), \
|
|
.b = (((base) & 0xff0000) >> 16) | (((flags) & 0xf0ff) << 8) | \
|
|
((limit) & 0xf0000) | ((base) & 0xff000000), \
|
|
} } }
|
|
|
|
enum {
|
|
GATE_INTERRUPT = 0xE,
|
|
GATE_TRAP = 0xF,
|
|
GATE_CALL = 0xC,
|
|
GATE_TASK = 0x5,
|
|
};
|
|
|
|
/* 16byte gate */
|
|
struct gate_struct64 {
|
|
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 long)(x) & 0xFFFF)
|
|
#define PTR_MIDDLE(x) (((unsigned long long)(x) >> 16) & 0xFFFF)
|
|
#define PTR_HIGH(x) ((unsigned long long)(x) >> 32)
|
|
|
|
enum {
|
|
DESC_TSS = 0x9,
|
|
DESC_LDT = 0x2,
|
|
DESCTYPE_S = 0x10, /* !system */
|
|
};
|
|
|
|
/* LDT or TSS descriptor in the GDT. 16 bytes. */
|
|
struct ldttss_desc64 {
|
|
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));
|
|
|
|
#ifdef CONFIG_X86_64
|
|
typedef struct gate_struct64 gate_desc;
|
|
typedef struct ldttss_desc64 ldt_desc;
|
|
typedef struct ldttss_desc64 tss_desc;
|
|
#define gate_offset(g) ((g).offset_low | ((unsigned long)(g).offset_middle << 16) | ((unsigned long)(g).offset_high << 32))
|
|
#define gate_segment(g) ((g).segment)
|
|
#else
|
|
typedef struct desc_struct gate_desc;
|
|
typedef struct desc_struct ldt_desc;
|
|
typedef struct desc_struct tss_desc;
|
|
#define gate_offset(g) (((g).b & 0xffff0000) | ((g).a & 0x0000ffff))
|
|
#define gate_segment(g) ((g).a >> 16)
|
|
#endif
|
|
|
|
struct desc_ptr {
|
|
unsigned short size;
|
|
unsigned long address;
|
|
} __attribute__((packed)) ;
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
/* Access rights as returned by LAR */
|
|
#define AR_TYPE_RODATA (0 * (1 << 9))
|
|
#define AR_TYPE_RWDATA (1 * (1 << 9))
|
|
#define AR_TYPE_RODATA_EXPDOWN (2 * (1 << 9))
|
|
#define AR_TYPE_RWDATA_EXPDOWN (3 * (1 << 9))
|
|
#define AR_TYPE_XOCODE (4 * (1 << 9))
|
|
#define AR_TYPE_XRCODE (5 * (1 << 9))
|
|
#define AR_TYPE_XOCODE_CONF (6 * (1 << 9))
|
|
#define AR_TYPE_XRCODE_CONF (7 * (1 << 9))
|
|
#define AR_TYPE_MASK (7 * (1 << 9))
|
|
|
|
#define AR_DPL0 (0 * (1 << 13))
|
|
#define AR_DPL3 (3 * (1 << 13))
|
|
#define AR_DPL_MASK (3 * (1 << 13))
|
|
|
|
#define AR_A (1 << 8) /* "Accessed" */
|
|
#define AR_S (1 << 12) /* If clear, "System" segment */
|
|
#define AR_P (1 << 15) /* "Present" */
|
|
#define AR_AVL (1 << 20) /* "AVaiLable" (no HW effect) */
|
|
#define AR_L (1 << 21) /* "Long mode" for code segments */
|
|
#define AR_DB (1 << 22) /* D/B, effect depends on type */
|
|
#define AR_G (1 << 23) /* "Granularity" (limit in pages) */
|
|
|
|
#endif /* _ASM_X86_DESC_DEFS_H */
|