CHAPTER 15 SYSTEM DOWN

---

This chapter describes the system down functions performed by the RI600PX.

15.1 Outline

When the event that cannot be recovered while the RI600PX is operating occurs, the system down is caused and the system down routine is invoked.

15.2 User-Own Coding Module

The system down routine must be implemented as user-own coding module.

Note The source file for the system down routine provided by the RI600PX as a sample file is "sysdwn.c".

15.2.1 System down routine (_RI_sys_dwn__( ))

The following shows the basic form of the system down routine. The system down routine must not return.

#include "kernel.h" /*Standard header file definition*/ #include "kernel_id.h" /*Header file generated by cfg600px*/ void _RI_sys_dwn__ ( W type, VW inf1, VW inf2, VW inf3 ); /*Prototype declaration*/ void _RI_sys_dwn__ ( W type, VW inf1, VW inf2, VW inf3 ) { /* ......... */ while(1); }

Note The function name of the system down routine is "_RI_sys_dwn__".

- Stack
The system down routine uses the system stack.

- Service call
The system down routine must not issue service calls.

- PSW register when processing is started

Table 15-1 PSW Register When System Down Routine is Started

Bit	Value	Note
I	0
IPL	- type < 0 : Undefined - type >= 0 : Same before system down	Do not lower IPL more than the start of processing.
PM	0	Supervisor mode
U	0	System stack
C, Z, S, O	undefined
Others	0

15.2.2 Parameters of system down routine

- type == -1 (Error when a kernel interrupt handler ends)

Table 15-2 Parameters of System Down Routine (type == -1)

inf1	inf2	inf3	Description
E_CTX (-25)	2	undefined	PSW.PM == 1 (user mode) when a kernel interrupt handler ends.
	3	undefined	PSW.IPL > kernel interrupt mask level when a kernel interrupt handler ends.
	5	undefined	The system is in the CPU locked state when a kernel interrupt handler ends.
E_MACV (-26)	12	undefined	Stack pointer points for the interrupted task points out of user stack for the task.

- type == -2 (Error in ext_tsk)

Table 15-3 Parameters of System Down Routine (type == -2)

inf1	inf2	inf3	Description
E_CTX (-25)	1	undefined	The ext_tsk is called in the non-task context.
	4	undefined	The ext_tsk is called in the state "PSW.IPL > Kernel interrupt mask level".

- type == -3 (Unlinked service call issued)

Table 15-4 Parameters of System Down Routine (type == -3)

inf1	inf2	inf3	Description
E_NOSPT (-9)	undefined	undefined	Unlinked service call is issued.

Note Refer to "2.6.1 Service call information files and "-ri600_preinit_mrc" compiler option".

- type == -4 (Error at returning from task exception handling routine)

Table 15-5 Parameters of System Down Routine (type == -4)

inf1	inf2	inf3	Description
E_CTX (-25)	7	undefined	A task exception handling routine returns in the state "PSW.IPL > Kernel interrupt mask level".
	8	undefined	A task exception handling routine returns in the CPU locked state.
	9	undefined	A task exception handling routine returns in the non-task context.

- type == -5 (Error in exd_tsk)

Table 15-6 Parameters of System Down Routine (type == -5)

inf1	inf2	inf3	Description
E_CTX (-25)	10	undefined	The exd_tsk is called in the state "PSW.IPL > Kernel interrupt mask level".
	11	undefined	The exd_tsk is called in the non-task context.

- type == -6 (Error in vsta_knl and ivsta_knl)

Table 15-7 Parameters of System Down Routine (type == -6)

inf1	inf2	inf3	Description
E_PAR (-17)	15	undefined	Error regarding to registration of memory object (memory_object[])	1 ) Start address is not 16-bytes boundary. 2 ) Bit15 of either acptn1, acptn2 or acptn3 is 1. 3 ) acptn1 == acptn2 == acptn3 == 0 4 ) Bits corresponded to the domain ID that is larger than the maximum domain ID (VTMAX_DOMAIN) of either acptn1, acptn2 or acptn3 is 1. 5 ) Start address > termination address
E_OBJ (-41)		undefined		Multiple memory object with the same address are registered.
E_OACV (-27)		undefined		The number of memory objects from which the access is permitted to onedomain exceeds 7.
E_PAR (-17)	16	undefined	Error regarding to task creation (task[])	The "termination address of user stack + 1" is not 16-bytes boundary.

- type == -16 (Undefined relocatable vector interrupt)

Table 15-8 Parameters of System Down Routine (type == -16)

inf1	inf2	inf3
- "-U" option is not specified for cfg600px Undefined - "-U" option is specified for cfg600px Vector number	PC, which is pushed to the stack by CPU's interrupt operation	PSW, which is pushed to the stack by CPU's interrupt operation

- type == -17 (Undefined fixed vector/exception vector interrupt)

Table 15-9 Parameters of System Down Routine (type == -17)

inf1	inf2	inf3
- "-U" option is not specified for cfg600px Undefined - "-U" option is specified for cfg600px Vector number	PC, which is pushed to the stack by CPU's interrupt operation	PSW, which is pushed to the stack by CPU's interrupt operation

- type > 0 (Issuing vsys_dwn, ivsys_dwn from application))
0 and a negative type value is reserved by the RI600PX. When calling vsys_dwn, ivsys_dwn from application, use positive type value.

Table 15-10 Parameters of System Down Routine (type > 0)

inf1	inf2	inf3
Value specified for vsys_dwn, ivsys_dwn