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Syscalls pass by int64. The identifier of the called function is in eax, parameters
are in ebx, ecx, edx, esi, edi.
Syscall list :
id=eax Name Parameters Description
0 thread_exit none Signal kernel that current thread has finished
1 schedule none Switch to next thread (might be the current one)
2 thread_sleep ebx: time (int) msecs Tell kernel to put current thread to sleep
3 process_exit ebx: return value (int) Tell kernel to end current process, cleaning up everything
4 printk ebx: addr of a string Print a message to screen
5 thread_new ebx: entry point Creates a new thread
ecx: data pointer
6 irq_wait ebx: irq number Waits for an IRQ (requires privilege PL_DRIVER)
7 proc_priv none Returns current process privilege level
8 shm_create ebx: offset Create a shared memory segment at offset (ret = errcode)
ecx: length
9 shm_delete ebx: offset Delete a shared memory segment at offset (ret = errcode)
10 object_create none Creates an object for current process (returns a descriptor to it)
11 object_owned ebx: object descriptor True (1) if object with this descriptor is ours, false(0) elsewhere
12 object_close ebx: object descriptor Closes descriptor to an object (deleting it if necessary)
13 request_get ebx: object descriptor Gets a request pending on object (only if we own it)
ecx: pointer to write request
edx: wait for a request ?
14 request_has ebx: object descriptor Is there a request waiting on this object ?
15 request_answer ebx: object descriptor
ecx, edx: answer Answer a request on object
16 request_mapShm ebx: object descriptor Map shared memory sent with request to receiver's address space
ecx: offset
edx: parameter number (0, 1 or 2)
17 request ebx: object descriptor Send a blocking request to object
ecx: pointer to user_sendrequest struct with information
18 send_msg same as above Send a nonblocking request to object, same as above
If a processes wishes to exit with an error code, it HAS to use process_exit. thread_exit will do nothing.
====== SYSCALL DESCRIPTION ======
= object_create (10)
Parameters: none
Returns: descriptor to created object, 0 if failure (should not happen)
Creates an object belonging to current proces.
= object_owned (11)
Parameters: an object descriptor
Returns:
- 1 if object belongs to current process
- 0 if object does not belong to current process
- -10 if descriptor does not exist
= object_close (12)
Parameters: an object descriptor
Returns: nothing
Closes a given descriptor to an object. If descriptor does not exist, call is ignored.
= request_get (13)
Parameters: an object descriptor, a pointer to a location to write request, a boolean : wait for a request?
Returns:
- -10 if descriptor does not exist
- -2 if object is not possesed by current process
- -3 if a blocking request is currently being processed
- -1 if no request is pending and [wait] is not set
- 0 if a request was written to location (call successful)
Fetches a waiting request or message on object, and deletes it or acknowledge it.
= request_has (14)
Parameters: an object descriptor
Returns:
- -10 if descriptor does not exist
- -2 if object is not possesed by current process
- 0 if no request is pending
- 1 if a waiting request is there
- 2 if a request is being processed
= request_answer (15)
Parameters: an object descriptor, two ints forming a long long if necessary
Returns: nothing
Answers a request marked as currently being processed, ignoring cases where :
- descriptor does not exist
- object does not belong to process
- no request was being processed
= request_mapShm (16)
Parameters: [id] object descriptor, [pos] pointer to a location, [number] int
Returns:
- -9 if [number] < 0 or [number] > 2
- -10 if descriptor does not exist
- -2 if object is not possesed by current process
- -3 if no request is being processed
- -4 if there is usually no shared memory in parameter [number]
- -7 if sender process is receiver process, in which case memory is already mapped somewhere
- -5 if no shared memory was sent by this parameter
- 0 if shared memory in parameter [number] of currently processed request of object [id] was mapped at [pos]
= request (17)
Parameters: [id] object descriptor, [pos] pointer to request data
Returns:
- -1 if an unknown error happened (should not happen)
- -10 if descriptor does not exist
- -11 if objet cannot handle requests
- -2 if request was interrupted
- 0 if request was handled and result written in [pos]->answer
= send_msg (18)
Parameters: [id] object descriptor, [pos] pointer to request data
Returns:
- -1 if an unknown error happened (should not happen)
- -10 if descriptor does not exist
- -11 if object cannot handle requests
- 0 if nonblocking message was sent
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