task.h File Reference

#include "memory/paging/paging.h"
#include "idt/idt.h"

Go to the source code of this file.

Data Structures
struct	registers
struct	task

Macros
#define	PROGRAM_VIRTUAL_ADDRESS   0x400000
#define	PROGRAM_VIRTUAL_STACK_SIZE   1024 * 16
#define	PROGRAM_VIRTUAL_STACK_ADDRESS_START   0x3FF000
#define	PROGRAM_VIRTUAL_STACK_ADDRESS_END   PROGRAM_VIRTUAL_STACK_ADDRESS_START - PROGRAM_VIRTUAL_STACK_SIZE

Functions
struct registers	__attribute__ ((packed))
struct task *	task_current ()
	Returns currently running task.
struct task *	task_get_next ()
	Returns next task in list (or first if there is no next task in current_task)
struct task *	task_new (struct process *process)
int	task_free (struct task *task)
	Frees all data associated with task struct.
void	task_return (struct registers *registers)
void	task_run_first_ever_task ()
void	user_registers ()
int	task_switch (struct task *task)
	Switch current task (switch pages)
int	task_page ()
	Loads into the task's page.
void	task_page_task (struct task *task)
void	task_current_save_state (struct interrupt_frame *frame)
int	task_copy_string_from (struct task *task, void *virtual_address, void *physical_address, int max)
void *	task_peek_stack (struct task *task, int offset)

Variables
uint32_t	edi
uint32_t	esi
uint32_t	ebp
uint32_t	ebx
uint32_t	edx
uint32_t	ecx
uint32_t	eax
uint32_t	ip
uint32_t	cs
uint32_t	flags
uint32_t	esp
uint32_t	ss
struct task	__attribute__

Macro Definition Documentation

PROGRAM_VIRTUAL_ADDRESS

#define PROGRAM_VIRTUAL_ADDRESS   0x400000

PROGRAM_VIRTUAL_STACK_ADDRESS_END

#define PROGRAM_VIRTUAL_STACK_ADDRESS_END   PROGRAM_VIRTUAL_STACK_ADDRESS_START - PROGRAM_VIRTUAL_STACK_SIZE

PROGRAM_VIRTUAL_STACK_ADDRESS_START

#define PROGRAM_VIRTUAL_STACK_ADDRESS_START   0x3FF000

PROGRAM_VIRTUAL_STACK_SIZE

#define PROGRAM_VIRTUAL_STACK_SIZE   1024 * 16

Function Documentation

__attribute__()

struct registers __attribute__

(

(packed)

)

task_copy_string_from()

int task_copy_string_from	(	struct task *	task,
		void *	virtual_address,
		void *	physical_address,
		int	max
	)

References assert, paging_chunk::directory_entry, kernel_page(), kfree(), kzalloc(), task::page_directory, PAGING_ACCESS_FROM_ALL, paging_get_page(), PAGING_IS_PRESENT, PAGING_IS_WRITEABLE, PAGING_PAGE_SIZE, paging_set_page(), paging_switch(), and strncpy().

task_current()

struct task * task_current

(

)

Returns currently running task.

Returns

struct task* Current task

References current_task.

task_current_save_state()

void task_current_save_state

(

struct interrupt_frame *

frame

)

References kernel_panic(), task_current(), and task_save_state().

task_free()

int task_free

(

struct task *

task

)

Frees all data associated with task struct.

Parameters

task	Task to free

Returns

int Error code

References kfree(), task::page_directory, and paging_free_directory().

task_get_next()

struct task * task_get_next

(

)

Returns next task in list (or first if there is no next task in current_task)

Returns

struct task* Next task

References current_task, task::next, and task_head.

task_new()

struct task * task_new

(

struct process *

process

)

References current_task, ENOMEM, ERROR, ISERR, kzalloc(), task::next, task::prev, task_free(), task_head, task_init(), and task_tail.

task_page()

int task_page

(

)

Loads into the task's page.

Returns

int Error code

References current_task, task_switch(), and user_registers().

task_page_task()

void task_page_task

(

struct task *

task

)

References task_switch(), and user_registers().

task_peek_stack()

void * task_peek_stack	(	struct task *	task,
		int	offset
	)

References registers::esp, kernel_page(), offset, task::registers, and task_page_task().

task_return()

void task_return

(

struct registers *

registers

)

task_run_first_ever_task()

void task_run_first_ever_task

(

)

References current_task, kernel_panic(), task::registers, task_head, task_return(), and task_switch().

task_switch()

int task_switch

(

struct task *

task

)

Switch current task (switch pages)

Parameters

task	Task to switch to

Returns

int Error code

References current_task, task::page_directory, and paging_switch().

user_registers()

void user_registers

(

)

Variable Documentation

__attribute__

struct task __attribute__

cs

uint32_t cs

eax

uint32_t eax

ebp

uint32_t ebp

ebx

uint32_t ebx

ecx

uint32_t ecx

edi

uint32_t edi

edx

uint32_t edx

esi

uint32_t esi

esp

uint32_t esp

flags

uint32_t flags

ip

uint32_t ip

ss

uint32_t ss