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Data Structures
union	descriptorTableUnion

struct	gdtDescriptor

struct	gdtGate

Macros
#define	dAcc 0x100 /* Accessed (Data or Code) */

#define	dBig 0x40 /* Default to 32 bit mode */

#define	dBiglim 0x80 /* Limit is in 4K units */

#define	dBusy 0xB00 /* Busy (TSS only) was 200 */

#define	dCall 0x0C00 /* 386 Call Gate */

#define	dCode 0x1800 /* Code Segment */

#define	dConform 0x400 /* Conforming (Code segments only) */

#define	dData 0x1000 /* Data Segment */

#define	dDpl0 0x0000 /* DPL0 or mask for DPL */

#define	dDpl1 0x2000 /* DPL1 or mask for DPL */

#define	dDpl2 0x4000 /* DPL2 or mask for DPL */

#define	dDpl3 0x6000 /* DPL3 or mask for DPL */

#define	dEexdown 0x400 /* Expand down (Data segments only) */

#define	dInt 0x0E00 /* 386 Interrupt Gate */

#define	dLdt 0x200 /* Local Descriptor Table (LDT) */

#define	dNpresent 0x8000 /* Not Present */

#define	dPresent 0x8000 /* Present */

#define	dRead 0x200 /* Readable (Code segments only) */

#define	dTask 0x500 /* Task gate */

#define	dTrap 0x0F00 /* 386 Trap Gate */

#define	dTss 0x900 /* Task State Segment (TSS) */

#define	dWrite 0x200 /* Writable (Data segments only) */

#define	SEL_GET_IDX(sel) (((sel)>>3) & 0x1FFF) /* Get Selector Index */

#define	SEL_GET_LG(sel) ((sel)&4) /* Return Local/Global Descriptor */

#define	SEL_GET_PL(sel) ((sel)&3) /* Get Priority Level Of Selector */

#define	SEL_PL_KERN 0x0

#define	SEL_PL_USER 0x3

#define	ubixDescriptorTable(name, length) union descriptorTableUnion name[length] =

#define	ubixGateDescriptor(offset, selector, control) {.gate = {(offset & 0xffff), selector, (control+dPresent), (offset >> 16) }}

#define	ubixStandardDescriptor(base, limit, control) {.descriptor = {(limit & 0xffff), (base & 0xffff), ((base >> 16) & 0xff), ((control + dPresent) >> 8), (limit >> 16), ((control & 0xff) >> 4), (base >> 24)}}

Functions
struct gdtDescriptor	__attribute__ ((packed))

Variables
union descriptorTableUnion	__attribute__

unsigned char	access

unsigned char	baseHigh

unsigned short	baseLow

unsigned char	baseMed

unsigned int	granularity

unsigned int	limitHigh

unsigned short	limitLow

unsigned short	offsetHigh

unsigned short	offsetLow

unsigned short	selector

union descriptorTableUnion	ubixGDT [11]

Macro Definition Documentation

◆ dAcc

#define dAcc 0x100 /* Accessed (Data or Code) */

Definition at line 56 of file gdt.h.

◆ dBig

#define dBig 0x40 /* Default to 32 bit mode */

Definition at line 62 of file gdt.h.

◆ dBiglim

#define dBiglim 0x80 /* Limit is in 4K units */

Definition at line 63 of file gdt.h.

◆ dBusy

#define dBusy 0xB00 /* Busy (TSS only) was 200 */

Definition at line 59 of file gdt.h.

◆ dCall

#define dCall 0x0C00 /* 386 Call Gate */

Definition at line 40 of file gdt.h.

◆ dCode

#define dCode 0x1800 /* Code Segment */

Definition at line 41 of file gdt.h.

◆ dConform

#define dConform 0x400 /* Conforming (Code segments only) */

Definition at line 61 of file gdt.h.

◆ dData

#define dData 0x1000 /* Data Segment */

Definition at line 42 of file gdt.h.

◆ dDpl0

#define dDpl0 0x0000 /* DPL0 or mask for DPL */

Definition at line 53 of file gdt.h.

◆ dDpl1

#define dDpl1 0x2000 /* DPL1 or mask for DPL */

Definition at line 52 of file gdt.h.

◆ dDpl2

#define dDpl2 0x4000 /* DPL2 or mask for DPL */

Definition at line 51 of file gdt.h.

◆ dDpl3

#define dDpl3 0x6000 /* DPL3 or mask for DPL */

Definition at line 50 of file gdt.h.

◆ dEexdown

#define dEexdown 0x400 /* Expand down (Data segments only) */

Definition at line 60 of file gdt.h.

◆ dInt

#define dInt 0x0E00 /* 386 Interrupt Gate */

Definition at line 43 of file gdt.h.

◆ dLdt

#define dLdt 0x200 /* Local Descriptor Table (LDT) */

Definition at line 44 of file gdt.h.

◆ dNpresent

#define dNpresent 0x8000 /* Not Present */

Definition at line 55 of file gdt.h.

◆ dPresent

#define dPresent 0x8000 /* Present */

Definition at line 54 of file gdt.h.

◆ dRead

#define dRead 0x200 /* Readable (Code segments only) */

Definition at line 58 of file gdt.h.

◆ dTask

#define dTask 0x500 /* Task gate */

Definition at line 45 of file gdt.h.

◆ dTrap

#define dTrap 0x0F00 /* 386 Trap Gate */

Definition at line 46 of file gdt.h.

◆ dTss

#define dTss 0x900 /* Task State Segment (TSS) */

Definition at line 47 of file gdt.h.

◆ dWrite

#define dWrite 0x200 /* Writable (Data segments only) */

Definition at line 57 of file gdt.h.

◆ SEL_GET_IDX

#define SEL_GET_IDX ( sel ) (((sel)>>3) & 0x1FFF) /* Get Selector Index */

Definition at line 34 of file gdt.h.

◆ SEL_GET_LG

#define SEL_GET_LG ( sel ) ((sel)&4) /* Return Local/Global Descriptor */

Definition at line 33 of file gdt.h.

◆ SEL_GET_PL

#define SEL_GET_PL ( sel ) ((sel)&3) /* Get Priority Level Of Selector */

Definition at line 32 of file gdt.h.

◆ SEL_PL_KERN

#define SEL_PL_KERN 0x0

Definition at line 36 of file gdt.h.

◆ SEL_PL_USER

#define SEL_PL_USER 0x3

Definition at line 37 of file gdt.h.

◆ ubixDescriptorTable

#define ubixDescriptorTable	(	name,
		length
	)	union descriptorTableUnion name[length] =

Definition at line 89 of file gdt.h.

◆ ubixGateDescriptor

#define ubixGateDescriptor	(	offset,
		selector,
		control
	)	{.gate = {(offset & 0xffff), selector, (control+dPresent), (offset >> 16) }}

Definition at line 91 of file gdt.h.

◆ ubixStandardDescriptor

#define ubixStandardDescriptor	(	base,
		limit,
		control
	)	{.descriptor = {(limit & 0xffff), (base & 0xffff), ((base >> 16) & 0xff), ((control + dPresent) >> 8), (limit >> 16), ((control & 0xff) >> 4), (base >> 24)}}

Definition at line 90 of file gdt.h.

Function Documentation

◆ attribute()

struct gdtDescriptor __attribute__ ( (packed) )

Variable Documentation

◆ attribute

struct gdtGate __attribute__

◆ access

unsigned short access

Definition at line 83 of file gdt.h.

◆ baseHigh

unsigned char baseHigh

Definition at line 86 of file gdt.h.

◆ baseLow

unsigned short baseLow

Definition at line 81 of file gdt.h.

◆ baseMed

unsigned char baseMed

Definition at line 82 of file gdt.h.

◆ granularity

unsigned int granularity

Definition at line 85 of file gdt.h.

◆ limitHigh

unsigned int limitHigh

Definition at line 84 of file gdt.h.

◆ limitLow

unsigned short limitLow

Definition at line 80 of file gdt.h.

◆ offsetHigh

unsigned short offsetHigh