T-Kernel Specification (1.B0.02)

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274 CHAPTER 6. T-KERNEL/DS FUNCTIONS td get otm Get System Operating Time [C Language Interface] ER ercd = td_get_otm ( SYSTIM *tim, UINT *ofs ) ; [Parameters] SYSTIM* tim Packet address for returning operating time (ms) UNIT* ofs Location for returning elapsed time from tim (nanoseconds) [Return Parameters] ER ercd Error code tim detail: ofs detail: Operating time (ms) Elapsed time from tim (nanoseconds) [Error Codes] E OK Normal completion [Description] Gets the system operating time (uptime, as elapsed milliseconds since the system was booted). The value returned in tim is the same as that obtained by tk get otm. tim is the resolution of time interrupt intervals (cycles), but even more precise time information is obtained in ofs as the elapsed time from tim in nanoseconds. The resolution of ofs is implementation-dependent, but generally is the timer hardware resolution. Since tim is time counted based on timer interrupts, in some cases time is not refreshed, when a timer interrupt cycle arrives while interrupts are disabled and the timer interrupt handler is not started (is delayed). In such cases, the time as updated by the previous timer interrupt is returned in tim, and the elapsed time from the previous timer interrupt is returned in ofs. Accordingly, in some cases ofs will be a longer time than the timer interrupt cycle. The length of elapsed time that can be measured by ofs depends on the hardware, but preferably it should be able to measure at least up to twice the timer interrupt cycle (0 ≤ ofs < twice the timer interrupt cycle). Note that the time returned in tim and ofs is the time at some point between the calling of and return from td get otm. It is neither the time at which td get otm was called nor the time of return from td get otm. In order to obtain more accurate information, this function should be called in interrupts disabled state. Copyright c○ 2002, 2003 by T-Engine Forum T-Kernel 1.B0.02
6.2. TRACE FUNCTIONS 275 6.2 Trace Functions These functions enable a debugger to trace program execution. Execution trace is performed by setting hook routines. • Return from a hook routine must be made after states have returned to where they were when the hook routine was called. Restoring of registers, however, can be done in accord with the C language function saving rules. • In a hook routine, limitations on states must not be modified to make them less restrictive than when the routine was called. For example, if the hook routine was called during interrupts disabled state, interrupts must not be enabled. • A hook routine was called at protection level 0. • A hook routine inherits the stack at the time of the hook. Too much stack use may therefore cause a stack overflow. The extent to which the stack can be used is not definite, since it differs with the situation at the time of the hook. Switching to a separate stack in the hook routine would be safer. 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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4.10. SUBSYSTEM MANAGEMENT FUNCTION
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Chapter 5 T-Kernel/SM Details of th
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5.1. SYSTEM MEMORY MANAGEMENT FUNCT
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T-Kernel Specification (1.B0.02)

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