task.c File Reference

#include "task.h"
#include <common/assert.h>
#include "common/status.h"
#include "memory/paging/paging.h"
#include "memory/heap/kheap.h"
#include "gdt/gdt.h"
#include "idt/idt.h"
#include "memory/memory.h"
#include "process.h"
#include "kernel.h"
#include "common/string.h"

Functions
int	task_init (struct task *task, struct process *process)
	Initializes task struct's ip,ss,esp registers and created new paging directory.
struct task *	task_current ()
	Returns currently running task.
void	task_save_state (struct task *task, struct interrupt_frame *frame)
void	task_current_save_state (struct interrupt_frame *frame)
struct task *	task_get_next ()
	Returns next task in list (or first if there is no next task in current_task)
int	task_free (struct task *task)
	Frees all data associated with task struct.
int	task_switch (struct task *task)
	Switch current task (switch pages)
int	task_page ()
	Loads into the task's page.
void	task_run_first_ever_task ()
struct task *	task_new (struct process *process)
int	task_copy_string_from (struct task *task, void *virtual_address, void *physical_address, int max)
void	task_page_task (struct task *task)
void *	task_peek_stack (struct task *task, int offset)

Variables
struct task *	current_task = 0
struct task *	task_tail = 0
struct task *	task_head = 0

Function Documentation

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_init()

int task_init	(	struct task *	task,
		struct process *	process
	)

Initializes task struct's ip,ss,esp registers and created new paging directory.

Parameters

task	Struct to be initialized

Returns

int Error code

References registers::cs, EIO, process::elf_entry, registers::esp, registers::flags, registers::ip, memset(), task::page_directory, PAGING_ACCESS_FROM_ALL, PAGING_IS_PRESENT, paging_new_directory(), task::process, PROGRAM_VIRTUAL_STACK_ADDRESS_START, task::registers, registers::ss, USER_CODE_SELECTOR, and USER_DATA_SELECTOR.

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_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_save_state()

void task_save_state	(	struct task *	task,
		struct interrupt_frame *	frame
	)

References interrupt_frame::cs, registers::cs, interrupt_frame::eax, registers::eax, interrupt_frame::ebp, registers::ebp, interrupt_frame::ebx, registers::ebx, interrupt_frame::ecx, registers::ecx, interrupt_frame::edi, registers::edi, interrupt_frame::edx, registers::edx, interrupt_frame::esi, registers::esi, interrupt_frame::esp, registers::esp, interrupt_frame::flags, registers::flags, interrupt_frame::ip, registers::ip, task::registers, interrupt_frame::ss, and registers::ss.

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().

Variable Documentation

current_task

struct task* current_task = 0

task_head

struct task* task_head = 0

task_tail

struct task* task_tail = 0