TSS

Task State Segment. More...

Collaboration diagram for TSS:

Detailed Description

Task State Segment.

The Task State Segment is more or less deprecated, we use it only to tell the cpu what stack pointer to use when handling interrupts. This is done using the Interrupt Stack Table (IST).

See also

OSDev Wiki TTS

Data Structures
struct	tss_t
	Task State Segment structure. More...

Macros
#define	TSS_IST_EXCEPTION   TSS_IST1
	The IST index to use for exceptions.
#define	TSS_IST_DOUBLE_FAULT   TSS_IST2
	The IST index to use for double faults.
#define	TSS_IST_NMI   TSS_IST3
	The IST index to use for non-maskable interrupts.
#define	TSS_IST_INTERRUPT   TSS_IST4
	The IST index to use for other interrupts.

Enumerations
enum	tss_ist_t {   TSS_IST_NONE = 0 , TSS_IST1 = 1 , TSS_IST2 = 2 , TSS_IST3 = 3 ,   TSS_IST4 = 4 , TSS_IST5 = 5 , TSS_IST6 = 6 , TSS_IST7 = 7 ,   TSS_IST_COUNT = 7 }
	Interrupt Stack Table indices. More...

Functions
void	tss_load (void)
	Load the TSS.
void	tss_init (tss_t *tss)
	Initialize a TSS structure.
void	tss_ist_load (tss_t *tss, tss_ist_t ist, stack_pointer_t *stack)
	Load a stack into an IST entry.

Macro Definition Documentation

TSS_IST_EXCEPTION

#define TSS_IST_EXCEPTION   TSS_IST1

The IST index to use for exceptions.

Definition at line 40 of file tss.h.

TSS_IST_DOUBLE_FAULT

#define TSS_IST_DOUBLE_FAULT   TSS_IST2

The IST index to use for double faults.

Definition at line 45 of file tss.h.

TSS_IST_NMI

#define TSS_IST_NMI   TSS_IST3

The IST index to use for non-maskable interrupts.

Definition at line 50 of file tss.h.

TSS_IST_INTERRUPT

#define TSS_IST_INTERRUPT   TSS_IST4

The IST index to use for other interrupts.

Definition at line 55 of file tss.h.

Enumeration Type Documentation

tss_ist_t

enum tss_ist_t

Interrupt Stack Table indices.

Enumerator
TSS_IST_NONE
TSS_IST1
TSS_IST2
TSS_IST3
TSS_IST4
TSS_IST5
TSS_IST6
TSS_IST7
TSS_IST_COUNT

Definition at line 24 of file tss.h.

Function Documentation

tss_load()

void tss_load ( void  )

extern

Load the TSS.

Loads the TSS using the ltr instruction, the TSS must already be present in the GDT.

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tss_init()

void tss_init

(

tss_t *

tss

)

Initialize a TSS structure.

Parameters

tss	The TSS structure to initialize.

Definition at line 5 of file tss.c.

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tss_ist_load()

void tss_ist_load	(	tss_t *	tss,
		tss_ist_t	ist,
		stack_pointer_t *	stack
	)

Load a stack into an IST entry.

Parameters

tss	The TSS structure to load the IST into.
ist	The IST index to load the stack into.
stack	The stack to load into the TSS.

Definition at line 21 of file tss.c.

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