segment.h File Reference

#include <miniOS/types.h>

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Classes
struct	segment_descriptor

Macros
#define	KERN_PRIVILEGE_LEVEL   0
#define	USER_PRIVILEGE_LEVEL   3
#define	GDT_CS_TYPE   0x9A
#define	GDT_DS_TYPE   0x92
#define	GDT_TSS_TYPE   0x89
#define	GDT_LDT_TYPE   0x82
#define	USER_CS_TYPE   0xFA
#define	USER_DS_TYPE   0xF2
#define	GDT_CS_INDEX   1
#define	GDT_DS_INDEX   2
#define	USER_DS_INDEX   3
#define	USER_CS_INDEX   4
#define	GDT_TSS_INDEX   5
#define	GDT_LDT_INDEX   6
#define	KERNEL_CS_SEL   SEG_REG_VAL(KERN_PRIVILEGE_LEVEL, 0, GDT_CS_INDEX) /* 0x08 */
#define	KERNEL_SS_SEL   SEG_REG_VAL(KERN_PRIVILEGE_LEVEL, 0, GDT_DS_INDEX) /* 0x10 */
#define	USER_CS_SEL   SEG_REG_VAL(USER_PRIVILEGE_LEVEL, 0, USER_CS_INDEX) /* 0x23 */
#define	USER_DS_SEL   SEG_REG_VAL(USER_PRIVILEGE_LEVEL, 0, USER_DS_INDEX) /* 0x1B */
#define	RFLAGS_IF   0x202ULL
#define	GDT_CS   SEG_REG_VAL(KERN_PRIVILEGE_LEVEL, 0, GDT_CS_INDEX)
#define	GDT_DS   SEG_REG_VAL(KERN_PRIVILEGE_LEVEL, 0, GDT_DS_INDEX)
#define	GDT_TSS   SEG_REG_VAL(KERN_PRIVILEGE_LEVEL, 0, GDT_TSS_INDEX)
#define	GDT_LDT   SEG_REG_VAL(KERN_PRIVILEGE_LEVEL, 0, GDT_LDT_INDEX)
#define	NR_LDT_ENTRIES   2
#define	LDT_CS_INDEX   0
#define	LDT_DS_INDEX   1
#define	__BUILD_SEG_DESC(base_addr, limit, _access, _long_mode, _size, _granularity)
#define	BUILD_SEG_DESC(base_addr, limit, access, long_mode, size)
#define	BUILD_4KB_SEG_DESC(base_addr, limit, access, long_mode, size)
#define	SEG_ADDR(seg_desc)
#define	SEG_SIZE(seg_desc)
#define	SEG_REG_VAL(privilege, in_ldt, segment_index)
#define	SEG_REG_RPL(seg_reg_val)
#define	restore_system_segments

Functions
struct segment_descriptor	__attribute__ ((__packed__))

Variables
uint16_t	limit_15_0
uint16_t	base_addr_15_0
uint8_t	base_addr_23_16
uint8_t	access
uint8_t	limit_19_16
uint8_t	u
uint8_t	long_mode
uint8_t	size
uint8_t	granularity
uint8_t	base_addr_31_24

Macro Definition Documentation

__BUILD_SEG_DESC

#define __BUILD_SEG_DESC	(		base_addr,
			limit,
			_access,
			_long_mode,
			_size,
			_granularity )

Value:

((struct segment_descriptor) {                     \
    .limit_15_0 = (limit) & 0xffff,                \
    .limit_19_16 = ((limit) >> 16) & 0xf,          \
    .base_addr_15_0 = (base_addr) & 0xffff,        \
    .base_addr_23_16 = ((base_addr) >> 16) & 0xff, \
    .base_addr_31_24 = ((base_addr) >> 24) & 0xff, \
    .u = 0, \
    .long_mode = (_long_mode), \
    .size = (_size), \
    .granularity = (_granularity),                \
    .access = (_access)                              \
})

BUILD_4KB_SEG_DESC

#define BUILD_4KB_SEG_DESC	(		base_addr,
			limit,
			access,
			long_mode,
			size )

Value:

__BUILD_SEG_DESC(base_addr, (limit >> 12), access, long_mode, size, 1)

BUILD_SEG_DESC

#define BUILD_SEG_DESC	(		base_addr,
			limit,
			access,
			long_mode,
			size )

Value:

__BUILD_SEG_DESC(base_addr, limit, access, long_mode, size, 0)

GDT_CS

#define GDT_CS   SEG_REG_VAL(KERN_PRIVILEGE_LEVEL, 0, GDT_CS_INDEX)

GDT_CS_INDEX

#define GDT_CS_INDEX   1

GDT_CS_TYPE

#define GDT_CS_TYPE   0x9A

GDT_DS

#define GDT_DS   SEG_REG_VAL(KERN_PRIVILEGE_LEVEL, 0, GDT_DS_INDEX)

GDT_DS_INDEX

#define GDT_DS_INDEX   2

GDT_DS_TYPE

#define GDT_DS_TYPE   0x92

GDT_LDT

#define GDT_LDT   SEG_REG_VAL(KERN_PRIVILEGE_LEVEL, 0, GDT_LDT_INDEX)

GDT_LDT_INDEX

#define GDT_LDT_INDEX   6

GDT_LDT_TYPE

#define GDT_LDT_TYPE   0x82

GDT_TSS

#define GDT_TSS   SEG_REG_VAL(KERN_PRIVILEGE_LEVEL, 0, GDT_TSS_INDEX)

GDT_TSS_INDEX

#define GDT_TSS_INDEX   5

GDT_TSS_TYPE

#define GDT_TSS_TYPE   0x89

KERN_PRIVILEGE_LEVEL

#define KERN_PRIVILEGE_LEVEL   0

KERNEL_CS_SEL

#define KERNEL_CS_SEL   SEG_REG_VAL(KERN_PRIVILEGE_LEVEL, 0, GDT_CS_INDEX) /* 0x08 */

KERNEL_SS_SEL

#define KERNEL_SS_SEL   SEG_REG_VAL(KERN_PRIVILEGE_LEVEL, 0, GDT_DS_INDEX) /* 0x10 */

LDT_CS_INDEX

#define LDT_CS_INDEX   0

LDT_DS_INDEX

#define LDT_DS_INDEX   1

NR_LDT_ENTRIES

#define NR_LDT_ENTRIES   2

restore_system_segments

#define restore_system_segments

Value:

pushq %rax;                    \
mov $GDT_DS, %ax;             \
mov %ax, %ds;                 \
mov %ax, %es;                 \
mov %ax, %fs;                 \
mov %ax, %gs;                 \
popq %rax;

RFLAGS_IF

#define RFLAGS_IF   0x202ULL

SEG_ADDR

#define SEG_ADDR

(

seg_desc

)

Value:

(((seg_desc)->base_addr_31_24 << 24) | \
((seg_desc)->base_addr_23_16 << 16) |  \
 (seg_desc)->base_15_0)

SEG_REG_RPL

#define SEG_REG_RPL

(

seg_reg_val

)

Value:

((seg_reg_val) & 0x3)

SEG_REG_VAL

#define SEG_REG_VAL	(		privilege,
			in_ldt,
			segment_index )

Value:

(((segment_index) << 3) | ((in_ldt) << 2) | (privilege))

SEG_SIZE

#define SEG_SIZE

(

seg_desc

)

Value:

((seg_desc)->granularity ?                                                     \
((((seg_desc)->limit_19_16 << 16) | (seg_desc)->limit_15_0) << 12) : \
 (((seg_desc)->limit_19_16 << 16) | (seg_desc)->limit_15_0))

USER_CS_INDEX

#define USER_CS_INDEX   4

USER_CS_SEL

#define USER_CS_SEL   SEG_REG_VAL(USER_PRIVILEGE_LEVEL, 0, USER_CS_INDEX) /* 0x23 */

USER_CS_TYPE

#define USER_CS_TYPE   0xFA

USER_DS_INDEX

#define USER_DS_INDEX   3

USER_DS_SEL

#define USER_DS_SEL   SEG_REG_VAL(USER_PRIVILEGE_LEVEL, 0, USER_DS_INDEX) /* 0x1B */

USER_DS_TYPE

#define USER_DS_TYPE   0xF2

USER_PRIVILEGE_LEVEL

#define USER_PRIVILEGE_LEVEL   3

Function Documentation

__attribute__()

struct segment_descriptor __attribute__

(

(__packed__)

)

Variable Documentation

access

uint8_t access

base_addr_15_0

uint16_t base_addr_15_0

base_addr_23_16

uint8_t base_addr_23_16

base_addr_31_24

uint8_t base_addr_31_24

granularity

uint8_t granularity

limit_15_0

uint16_t limit_15_0

limit_19_16

uint8_t limit_19_16

long_mode

uint8_t long_mode

size

uint8_t size

u

uint8_t u