T-Kernel Specification (1.B0.02)

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248 CHAPTER 5. T-KERNEL/SM 5.4 Interrupt Management Functions Interrupt handling is largely hardware-dependent, differing with each system, and therefore difficult to standardize. The following are given as standard specifications, but it may not be possible to follow these exactly on all systems. Implementors should strive to comply with these specifications to the extent possible; but where implementation is not feasible, full compliance is not mandatory. If functions not in the standard specifications are added, however, the function names must be different from those given here. In any case, DI(), EI(), and isDI() must be implemented in accord with the standard specifications. Interrupt management functions are provided as library functions or C language macros. These can be called from a task-independent portion and while dispatching and interrupts are disabled. 5.4.1 CPU Interrupt Control These functions are for CPU external interrupt flag control. Generally they do not perform any operation on the interrupt controller. DI() and EI() are C language macros. • DI( UINT intsts ) intsts CPU interrupt status (details are implementation-dependent) This is not a pointer. Disables all external interrupts. The status prior to disabling interrupts is stored in intsts. • EI( UINT intsts ) intsts CPU interrupt status (details are implementation-dependent) Enables all external interrupts. More precisely, this macro restores the status in intsts. That is, the interrupt status reverts to what it was before interrupts were disabled by DI(). If there were interrupts disabled at the time DI() was executed, those interrupts are not enabled by EI(). All interrupts can be enabled, however, by designating 0 in intsts. intsts must be either the values stored in it by DI() or 0. If any other value is designated, the behavior is not guaranteed. • BOOL isDI( UINT intsts ) intsts Return code: TRUE (not 0): FALSE: CPU interrupt status (details are implementation-dependent) Interrupts disabled Interrupts enabled Gets the status of external interrupt disabling stored in intsts. Interrupts disabled status is the status in which T-Kernel/OS determines that interrupts are disabled. intsts must by the value stored by DI(). If any other value is designated, the behavior is not guaranteed. Sample usage: Copyright c○ 2002, 2003 by T-Engine Forum T-Kernel 1.B0.02
5.4. INTERRUPT MANAGEMENT FUNCTIONS 249 void foo() { UINT intsts; DI(intsts); if ( isDI(intsts) ) { /* Interrupts were already disabled at the time this function was called.*/ } else { /* Interrupts were enabled at the time this function was called. */ } EI(intsts); } 5.4.2 Control of Interrupt Controller These functions control the interrupt controller. Generally they do not perform any operation with respect to the CPU interrupt flag. typedef UINT INTVEC; /* interrupt vector */ The specific details of the interrupt vectors (INTVEC) are implementation-dependent. Preferably, however, they should be the same numbers as the interrupt definition numbers designated with tk def int, or should allow for simple conversion to and from those numbers. • UINT DINTNO( INTVEC intvec ) Converts an interrupt vector to the corresponding interrupt definition number. • void EnableInt( INTVEC intvec ) • void EnableInt( INTVEC intvec, INT level ) Enables the interrupt designated in intvec. In a system that allows interrupt priority level to be designated, the level parameter can be used to designate the interrupt priority level. The precise meaning of level is implementation-dependent. Both methods with and without the level designation must be provided. • void DisableInt( INTVEC intvec ) Disables the interrupt designated in intvec. Generally, interrupts raised while interrupts are disabled are made pending, and are raised after interrupts are enabled by EnableInt(). ClearInt() must be used if it is desired to clear interrupts occurring in interrupts disabled state. • void ClearInt( INTVEC intvec ) Clears any interrupts raised for intvec. • void EndOfInt( INTVEC intvec ) Issues EOI (End Of Interrupt) to the interrupt controller intvec must be an interrupt for which EOI can be issued. Generally this must be executed at the end of an interrupt handler. Copyright c○ 2002, 2003 by T-Engine Forum T-Kernel 1.B0.02
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T-Kernel Specification T-Kernel 1.B
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Contents 1 T-Kernel Overview 1 1.1
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CONTENTS v tk set flg (Set Event Fl
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CONTENTS vii 5.2.2 Address Space Ch
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CONTENTS ix td cal que (Reference Q
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List of Figures 1.1 Position of T-K
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List of Tables 2.1 State Transition
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System Call Notation In the parts o
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Index of T-Kernel/OS System Calls T
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INDEX OF T-KERNEL/OS SYSTEM CALLS x
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Index of T-Kernel/SM Extended SVC L
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Index of T-Kernel/DS System Calls T
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Chapter 1 T-Kernel Overview 1.1 Pos
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1.2. SCALABILITY 3 • Middleware m
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Chapter 2 Concepts Underlying the T
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2.2. TASK STATES AND SCHEDULING RUL
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2.2. TASK STATES AND SCHEDULING RUL
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2.3. INTERRUPT HANDLING 11 preceden
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2.5. SYSTEM STATES 13 Transient sta
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2.7. MEMORY 15 which the upper and
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Chapter 3 Common T-Kernel Specifica
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3.2. SYSTEM CALLS 19 /* * Common co
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3.2. SYSTEM CALLS 21 Ordinarily a f
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3.3. HIGH-LEVEL LANGUAGE SUPPORT RO
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Chapter 4 T-Kernel/OS Functions Thi
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4.1. TASK MANAGEMENT FUNCTIONS 27 t
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4.7. TIME MANAGEMENT FUNCTIONS 163
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4.8. INTERRUPT MANAGEMENT FUNCTIONS
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4.9. SYSTEM MANAGEMENT FUNCTIONS 19
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T-Kernel Specification (1.B0.02)

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