FAT Driver - Cooperative Additions

Files
file	fat_coop.c
	FAT driver coop additions implementation
file	fat_coop.h
	FAT driver Coop Additions definitions
file	fat-coop-arch.c
	FAT driver Coop Additions implementation - Platform specific
file	fat-coop-arch.h
	FAT driver Coop Additions definitions - Platform specific

Functions
void	coop_mt_init (void *data)
	This function is mostly copied from the arm/mtarch.c file.
void	coop_switch_sp ()
	Function switches the stack pointers for Atmel based devices (32 GPR's).
void	perform_next_step (QueueEntry *entry)
	Changes Stack pointer to internal Thread. More...
void	finish_operation (QueueEntry *entry)
	Sends a Message to the source_process of the Entry and removes the Entry from the queue. More...
void	operation (void *data)
uint8_t	push_on_buffer (uint8_t *source, uint16_t length)
	This function is used to buffer the payload of write requests in a ring buffer However, the ring functionality does not work.
int8_t	ccfs_write (int fd, uint8_t *buf, uint16_t length, uint8_t *token)
void	coop_finished_op ()
	This Function jumps back to perform_next_step()
void	coop_mt_stop ()
	Set the interal stack to NULL to end process.

Variables
struct file_system	mounted
	From fat.c.
struct file	fat_file_pool [FAT_FD_POOL_SIZE]
	From fat.c.
struct file_desc	fat_fd_pool [FAT_FD_POOL_SIZE]
	From fat.c.

Detailed Description

Function Documentation

int8_t ccfs_write	(	int	fd,
		uint8_t *	buf,
		uint16_t	length,
		uint8_t *	token
	)

FIXME: We push information in a ring buffer, which actually does not work as a ring, because the eventual cfs_write call does not know anything about rings

Definition at line 568 of file fat_coop.c.

References NULL, PROCESS_CURRENT, PROCESS_ERR_FULL, process_post(), process_start(), and push_on_buffer().

void finish_operation

(

QueueEntry *

entry

)

Sends a Message to the source_process of the Entry and removes the Entry from the queue.

Parameters

*entry

The entry which should be finished.

Definition at line 289 of file fat_coop.c.

References coop_mt_init(), coop_mt_stop(), NULL, and process_post().

void operation

(

void *

data

)

FIXME: Ring Buffer functionality does not work, because cfs_write does not know, that the buffer may wrap around

Definition at line 179 of file fat_coop.c.

References cfs_close(), cfs_closedir(), cfs_open(), cfs_opendir(), cfs_readdir(), cfs_remove(), cfs_seek(), fat_fd_pool, and NULL.

Referenced by coop_mt_init().

void perform_next_step

(

QueueEntry *

entry

)

Changes Stack pointer to internal Thread.

Returns after one step has been completed.

If this function was called with one specific QueueEntry, then this function must be called again and again with the same QueueEntry, until the QueueEntry is finished executing.

Parameters

*entry

The QueueEntry, which should be processed.

Definition at line 198 of file fat-coop-arch.c.

References coop_mt_init(), coop_switch_sp(), and NULL.