Detailed Description

Example of architecture-dependent routines.

Macros
#define	_TN_FFS(x) (32 - __builtin_clz((x) & (0 - (x))))
	FFS - find first set bit. More...

#define	_TN_FATAL_ERROR(error_msg,...) {__asm__ volatile(" sdbbp 0"); __asm__ volatile ("nop");}
	Used by the kernel as a signal that something really bad happened. More...

#define	TN_ARCH_STK_ATTR_BEFORE
	Compiler-specific attribute that should be placed before declaration of array used for stack. More...

#define	TN_ARCH_STK_ATTR_AFTER __attribute__((aligned(0x8)))
	Compiler-specific attribute that should be placed after declaration of array used for stack. More...

#define	TN_MIN_STACK_SIZE 36
	Minimum task's stack size, in words, not in bytes; includes a space for context plus for parameters passed to task's body function.

#define	TN_INT_WIDTH 32
	Width of `int` type.

#define	TN_PRIORITIES_MAX_CNT TN_INT_WIDTH
	Maximum number of priorities available, this value usually matches `TN_INT_WIDTH`. More...

#define	TN_WAIT_INFINITE (TN_Timeout)0xFFFFFFFF
	Value for infinite waiting, usually matches `ULONG_MAX`, because `TN_Timeout` is declared as `unsigned long`.

#define	TN_FILL_STACK_VAL 0xFEEDFACE
	Value for initializing the unused space of task's stack.

#define	TN_INTSAVE_DATA int tn_save_status_reg = 0;
	Declares variable that is used by macros `TN_INT_DIS_SAVE()` and `TN_INT_RESTORE()` for storing status register value. More...

#define	TN_INTSAVE_DATA_INT TN_INTSAVE_DATA
	The same as `TN_INTSAVE_DATA` but for using in ISR together with `TN_INT_IDIS_SAVE()`, `TN_INT_IRESTORE()`. More...

#define	TN_INT_DIS_SAVE() tn_save_status_reg = tn_arch_sr_save_int_dis()
	Disable interrupts and return previous value of status register, atomically. More...

#define	TN_INT_RESTORE() tn_arch_sr_restore(tn_save_status_reg)
	Restore previously saved status register. More...

#define	TN_INT_IDIS_SAVE() TN_INT_DIS_SAVE()
	The same as `TN_INT_DIS_SAVE()` but for using in ISR. More...

#define	TN_INT_IRESTORE() TN_INT_RESTORE()
	The same as `TN_INT_RESTORE()` but for using in ISR. More...

#define	TN_IS_INT_DISABLED() ((__builtin_mfc0(12, 0) & 1) == 0)
	Returns nonzero if interrupts are disabled, zero otherwise.

#define	_TN_CONTEXT_SWITCH_IPEND_IF_NEEDED() _tn_context_switch_pend_if_needed()
	Pend context switch from interrupt.

#define	_TN_SIZE_BYTES_TO_UWORDS(size_in_bytes) ((size_in_bytes) >> 2)
	Converts size in bytes to size in `TN_UWord`. More...

Typedefs
typedef unsigned int	TN_UWord
	Unsigned integer type whose size is equal to the size of CPU register. More...

typedef unsigned int	TN_UIntPtr
	Unsigned integer type that is able to store pointers. More...

Macro Definition Documentation

#define _TN_FFS ( x ) (32 - __builtin_clz((x) & (0 - (x))))

FFS - find first set bit.

Used in _find_next_task_to_run() function. Say, for 0xa8 it should return 3.

May be not defined: in this case, naive algorithm will be used.

Definition at line 53 of file tn_arch_example.h.

#define _TN_FATAL_ERROR	(	error_msg,
		...
	)	{__asm__ volatile(" sdbbp 0"); __asm__ volatile ("nop");}

Used by the kernel as a signal that something really bad happened.

Indicates TNeoKernel bugs as well as illegal kernel usage (e.g. sleeping in the idle task callback)

Typically, set to assembler instruction that causes debugger to halt.

Definition at line 62 of file tn_arch_example.h.

#define TN_ARCH_STK_ATTR_BEFORE

Compiler-specific attribute that should be placed before declaration of array used for stack.

It is needed because there are often additional restrictions applied to alignment of stack, so, to meet them, stack arrays need to be declared with these macros.

See also: TN_ARCH_STK_ATTR_AFTER

Definition at line 76 of file tn_arch_example.h.

#define TN_ARCH_STK_ATTR_AFTER __attribute__((aligned(0x8)))

Compiler-specific attribute that should be placed after declaration of array used for stack.

It is needed because there are often additional restrictions applied to alignment of stack, so, to meet them, stack arrays need to be declared with these macros.