Description

Kernel contains mechanism of using kernel services.

Portable parts of system call machinery.

This mechanism (commonly known as system calls, or syscalls) can be used to call system services only from userspace code running in thread context. It is not possible to call these services from within ISR context.

enum	eSysCalls { SYSCALL_GET_TID = 0 , SYSCALL_SCHED_YIELD , SYSCALL_THREAD_CREATE , SYSCALL_MUTEX_INIT , SYSCALL_MUTEX_DESTROY , SYSCALL_MUTEX_UNLOCK , SYSCALL_MUTEX_TRYLOCK , SYSCALL_RPC_CALL , SYSCALL_RPC_RETURN , SYSCALL_THREAD_JOIN , SYSCALL_THREAD_EXIT , SYSCALL_SETITIMER , SYSCALL_USLEEP , SYSCALL_SIGNAL , SYSCALL_KILL , SYSCALL_SETPRIORITY , SYSCALL_RESET , _SYSCALL_COUNT }
	List of known syscall IDs. More...

typedef int(*	Syscall_Handler_t) (int, int, int, int)

#define	__SYSCALL __attribute__((naked)) __attribute__((noinline))
	Mark function as syscall entrypoint in userspace.

#define	___SVC(no)

#define	__SVC(no) ___SVC(no)
	Perform syscall.

Macro Definition Documentation

◆ ___SVC

#define ___SVC ( no )

Value:

    asm volatile(\
            "SVC %[immediate]\n\t"\
            "BX LR\n\t" : : [immediate] "I" (no))

◆ __SVC

#define __SVC ( no ) ___SVC(no)

Perform syscall.

Parameters

no	number of syscall.

◆ __SYSCALL

#define __SYSCALL __attribute__((naked)) __attribute__((noinline))

Mark function as syscall entrypoint in userspace.

This gives the function some common attributes. Currently syscall entrypoint are short functions which never get inlined and don't construct stack frame. This is the most efficient method of calling syscalls right now.

Typedef Documentation

◆ Syscall_Handler_t

typedef int(* Syscall_Handler_t) (int, int, int, int)

Enumeration Type Documentation

◆ eSysCalls

enum eSysCalls

List of known syscall IDs.

These syscall IDs are known and can be used to call services.

Enumerator
SYSCALL_GET_TID
SYSCALL_SCHED_YIELD
SYSCALL_THREAD_CREATE
SYSCALL_MUTEX_INIT
SYSCALL_MUTEX_DESTROY
SYSCALL_MUTEX_UNLOCK
SYSCALL_MUTEX_TRYLOCK
SYSCALL_RPC_CALL
SYSCALL_RPC_RETURN
SYSCALL_THREAD_JOIN
SYSCALL_THREAD_EXIT
SYSCALL_SETITIMER
SYSCALL_USLEEP
SYSCALL_SIGNAL
SYSCALL_KILL
SYSCALL_SETPRIORITY
SYSCALL_RESET
_SYSCALL_COUNT