FreeCalypso > hg > fc-tourmaline
view src/nucleus/smc.c @ 303:f76436d19a7a default tip
!GPRS config: fix long-standing AT+COPS chance hanging bug
There has been a long-standing bug in FreeCalypso going back years:
sometimes in the AT command bring-up sequence of an ACI-only MS,
the AT+COPS command would produce only a power scan followed by
cessation of protocol stack activity (only L1 ADC traces), instead
of the expected network search sequence. This behaviour was seen
in different FC firmware versions going back to Citrine, and seemed
to follow some law of chance, not reliably repeatable.
This bug has been tracked down and found to be specific to !GPRS
configuration, stemming from our TCS2/TCS3 hybrid and reconstruction
of !GPRS support that was bitrotten in TCS3.2/LoCosto version.
ACI module psa_mms.c, needed only for !GPRS, was missing in the TCS3
version and had to be pulled from TCS2 - but as it turns out,
there is a new field in the MMR_REG_REQ primitive that needs to be
set correctly, and that psa_mms.c module is the place where this
initialization needed to be added.
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Thu, 08 Jun 2023 08:23:37 +0000 |
| parents | 4e78acac3d88 |
| children |
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/*************************************************************************/ /* */ /* Copyright Mentor Graphics Corporation 2002 */ /* All Rights Reserved. */ /* */ /* THIS WORK CONTAINS TRADE SECRET AND PROPRIETARY INFORMATION WHICH IS */ /* THE PROPERTY OF MENTOR GRAPHICS CORPORATION OR ITS LICENSORS AND IS */ /* SUBJECT TO LICENSE TERMS. */ /* */ /*************************************************************************/ /*************************************************************************/ /* */ /* FILE NAME VERSION */ /* */ /* smc.c Nucleus PLUS 1.14 */ /* */ /* COMPONENT */ /* */ /* SM - Semaphore Management */ /* */ /* DESCRIPTION */ /* */ /* This file contains the core routines for the Semaphore Management*/ /* component. */ /* */ /* DATA STRUCTURES */ /* */ /* None */ /* */ /* FUNCTIONS */ /* */ /* SMC_Create_Semaphore Create a semaphore */ /* SMC_Delete_Semaphore Delete a semaphore */ /* SMC_Obtain_Semaphore Obtain instance of semaphore */ /* SMC_Release_Semaphore Release instance of semaphore*/ /* SMC_Cleanup Cleanup on timeout or a */ /* terminate condition */ /* */ /* DEPENDENCIES */ /* */ /* cs_extr.h Common Service functions */ /* tc_extr.h Thread Control functions */ /* sm_extr.h Semaphore functions */ /* hi_extr.h History functions */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1993 Created initial version 1.0 */ /* 04-19-1993 Verified version 1.0 */ /* 08-09-1993 Corrected pointer retrieval */ /* loop, resulting in version 1.0a */ /* 08-09-1993 Verified version 1.0a */ /* 03-01-1994 Moved non-core functions into */ /* supplemental files, changed */ /* function interfaces to match */ /* those in prototype, added */ /* register options, changed */ /* protection logic to reduce */ /* overhead, resulting in */ /* version 1.1 */ /* */ /* 03-18-1994 Verified version 1.1 */ /* 04-17-1996 updated to version 1.2 */ /* 03-24-1998 Released version 1.3 */ /* 03-26-1999 Released 1.11m (new release */ /* numbering scheme) */ /* 04-17-2002 Released version 1.13m */ /* 11-07-2002 Released version 1.14 */ /*************************************************************************/ #define NU_SOURCE_FILE #include "cs_extr.h" /* Common service functions */ #include "tc_extr.h" /* Thread control functions */ #include "sm_extr.h" /* Semaphore functions */ #include "hi_extr.h" /* History functions */ #include "profiler.h" /* ProView interface */ /* Define external inner-component global data references. */ extern CS_NODE *SMD_Created_Semaphores_List; extern UNSIGNED SMD_Total_Semaphores; extern TC_PROTECT SMD_List_Protect; /* Define internal component function prototypes. */ VOID SMC_Cleanup(VOID *information); /*************************************************************************/ /* */ /* FUNCTION */ /* */ /* SMC_Create_Semaphore */ /* */ /* DESCRIPTION */ /* */ /* This function creates a semaphore and then places it on the list */ /* of created semaphores. */ /* */ /* CALLED BY */ /* */ /* Application */ /* SMCE_Create_Semaphore Error checking shell */ /* */ /* CALLS */ /* */ /* CSC_Place_On_List Add node to linked-list */ /* [HIC_Make_History_Entry] Make entry in history log */ /* [TCT_Check_Stack] Stack checking function */ /* TCT_Protect Data structure protect */ /* TCT_Unprotect Un-protect data structure */ /* */ /* INPUTS */ /* */ /* semaphore_ptr Semaphore control block ptr */ /* name Semaphore name */ /* initial_count Initial semaphore instance */ /* count */ /* suspend_type Suspension type */ /* */ /* OUTPUTS */ /* */ /* NU_SUCCESS */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1993 Created initial version 1.0 */ /* 04-19-1993 Verified version 1.0 */ /* 03-01-1994 Changed function interfaces to */ /* match those in prototype, */ /* added register options, */ /* resulting in version 1.1 */ /* */ /* 03-18-1994 Verified version 1.1 */ /* */ /*************************************************************************/ STATUS SMC_Create_Semaphore(NU_SEMAPHORE *semaphore_ptr, CHAR *name, UNSIGNED initial_count, OPTION suspend_type) { R1 SM_SCB *semaphore; /* Semaphore control blk ptr */ INT i; /* Working index variable */ NU_SUPERV_USER_VARIABLES /* Switch to supervisor mode */ NU_SUPERVISOR_MODE(); /* Move input semaphore pointer into internal pointer. */ semaphore = (SM_SCB *) semaphore_ptr; #ifdef NU_ENABLE_STACK_CHECK /* Call stack checking function to check for an overflow condition. */ TCT_Check_Stack(); #endif #ifdef NU_ENABLE_HISTORY /* Make an entry that corresponds to this function in the system history log. */ HIC_Make_History_Entry(NU_CREATE_SEMAPHORE_ID, (UNSIGNED) semaphore, (UNSIGNED) name, (UNSIGNED) initial_count); #endif /* First, clear the semaphore ID just in case it is an old Semaphore Control Block. */ semaphore -> sm_id = 0; /* Fill in the semaphore name. */ for (i = 0; i < NU_MAX_NAME; i++) semaphore -> sm_name[i] = name[i]; /* Setup the initial semaphore instance count. */ semaphore -> sm_semaphore_count = initial_count; /* Setup the semaphore suspension type. */ if (suspend_type == NU_FIFO) /* FIFO suspension is selected, setup the flag accordingly. */ semaphore -> sm_fifo_suspend = NU_TRUE; else /* Priority suspension is selected. */ semaphore -> sm_fifo_suspend = NU_FALSE; /* Clear the suspension list pointer. */ semaphore -> sm_suspension_list = NU_NULL; /* Clear the number of tasks waiting on the semaphore counter. */ semaphore -> sm_tasks_waiting = 0; /* Initialize link pointers. */ semaphore -> sm_created.cs_previous = NU_NULL; semaphore -> sm_created.cs_next = NU_NULL; /* Protect against access to the list of created semaphores. */ TCT_Protect(&SMD_List_Protect); /* At this point the semaphore is completely built. The ID can now be set and it can be linked into the created semaphore list. */ semaphore -> sm_id = SM_SEMAPHORE_ID; /* Link the semaphore into the list of created semaphores and increment the total number of semaphores in the system. */ CSC_Place_On_List(&SMD_Created_Semaphores_List,&(semaphore -> sm_created)); SMD_Total_Semaphores++; #ifdef INCLUDE_PROVIEW _RTProf_DumpSema(RT_PROF_CREATE_SEMAPHORE,semaphore, RT_PROF_OK); #endif /* Release protection against access to the list of created semaphores. */ TCT_Unprotect(); /* Return to user mode */ NU_USER_MODE(); /* Return successful completion. */ return(NU_SUCCESS); } /*************************************************************************/ /* */ /* FUNCTION */ /* */ /* SMC_Delete_Semaphore */ /* */ /* DESCRIPTION */ /* */ /* This function deletes a semaphore and removes it from the list */ /* of created semaphores. All tasks suspended on the semaphore are */ /* resumed. Note that this function does not free the memory */ /* associated with the semaphore control block. */ /* */ /* CALLED BY */ /* */ /* Application */ /* SMCE_Delete_Semaphore Error checking shell */ /* */ /* CALLS */ /* */ /* CSC_Remove_From_List Remove node from list */ /* [HIC_Make_History_Entry] Make entry in history log */ /* TCC_Resume_Task Resume a suspended task */ /* [TCT_Check_Stack] Stack checking function */ /* TCT_Control_To_System Transfer control to system */ /* TCT_Protect Protect created list */ /* TCT_Set_Current_Protect Modify current protection */ /* TCT_System_Protect Setup system protection */ /* TCT_System_Unprotect Release system protection */ /* TCT_Unprotect Release protection */ /* */ /* INPUTS */ /* */ /* semaphore_ptr Semaphore control block ptr */ /* */ /* OUTPUTS */ /* */ /* NU_SUCCESS */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1993 Created initial version 1.0 */ /* 04-19-1993 Verified version 1.0 */ /* 03-01-1994 Changed function interfaces to */ /* match those in prototype, */ /* added register options, changed */ /* protection logic to reduce */ /* overhead, resulting in */ /* version 1.1 */ /* */ /* 03-18-1994 Verified version 1.1 */ /* */ /*************************************************************************/ STATUS SMC_Delete_Semaphore(NU_SEMAPHORE *semaphore_ptr) { R1 SM_SCB *semaphore; /* Semaphore control blk ptr */ SM_SUSPEND *suspend_ptr; /* Suspend block pointer */ SM_SUSPEND *next_ptr; /* Next suspend block */ STATUS preempt; /* Status for resume call */ NU_SUPERV_USER_VARIABLES /* Switch to supervisor mode */ NU_SUPERVISOR_MODE(); /* Move input semaphore pointer into internal pointer. */ semaphore = (SM_SCB *) semaphore_ptr; #ifdef NU_ENABLE_STACK_CHECK /* Call stack checking function to check for an overflow condition. */ TCT_Check_Stack(); #endif #ifdef NU_ENABLE_HISTORY /* Make an entry that corresponds to this function in the system history log. */ HIC_Make_History_Entry(NU_DELETE_SEMAPHORE_ID, (UNSIGNED) semaphore, (UNSIGNED) 0, (UNSIGNED) 0); #endif /* Protect against access to the semaphore. */ TCT_System_Protect(); #ifdef INCLUDE_PROVIEW _RTProf_DumpSema(RT_PROF_DELETE_SEMAPHORE,semaphore, RT_PROF_OK); #endif /* Clear the semaphore ID. */ semaphore -> sm_id = 0; /* Release protection. */ TCT_Unprotect(); /* Protect against access to the list of created semaphores. */ TCT_Protect(&SMD_List_Protect); /* Remove the semaphore from the list of created semaphores. */ CSC_Remove_From_List(&SMD_Created_Semaphores_List, &(semaphore -> sm_created)); /* Decrement the total number of created semaphores. */ SMD_Total_Semaphores--; /* Pickup the suspended task pointer list. */ suspend_ptr = semaphore -> sm_suspension_list; /* Walk the chain task(s) currently suspended on the semaphore. */ preempt = 0; while (suspend_ptr) { /* Protect against system access. */ TCT_System_Protect(); /* Resume the suspended task. Insure that the status returned is NU_SEMAPHORE_DELETED. */ suspend_ptr -> sm_return_status = NU_SEMAPHORE_DELETED; /* Point to the next suspend structure in the link. */ next_ptr = (SM_SUSPEND *) (suspend_ptr -> sm_suspend_link.cs_next); /* Resume the specified task. */ preempt = preempt | TCC_Resume_Task((NU_TASK *) suspend_ptr -> sm_suspended_task, NU_SEMAPHORE_SUSPEND); /* Determine if the next is the same as the current pointer. */ if (next_ptr == semaphore -> sm_suspension_list) /* Clear the suspension pointer to signal the end of the list traversal. */ suspend_ptr = NU_NULL; else /* Move the next pointer into the suspend block pointer. */ suspend_ptr = next_ptr; /* Modify current protection. */ TCT_Set_Current_Protect(&SMD_List_Protect); /* Clear the system protection. */ TCT_System_Unprotect(); } /* Determine if preemption needs to occur. */ if (preempt) /* Transfer control to system to facilitate preemption. */ TCT_Control_To_System(); /* Release protection against access to the list of created semaphores. */ TCT_Unprotect(); /* Return to user mode */ NU_USER_MODE(); /* Return a successful completion. */ return(NU_SUCCESS); } /*************************************************************************/ /* */ /* FUNCTION */ /* */ /* SMC_Obtain_Semaphore */ /* */ /* DESCRIPTION */ /* */ /* This function obtains an instance of the semaphore. An instance */ /* corresponds to decrementing the counter by 1. If the counter is */ /* greater than zero at the time of this call, this function can be */ /* completed immediately. Otherwise, suspension is possible. */ /* */ /* CALLED BY */ /* */ /* Application */ /* SMCE_Obtain_Semaphore Error checking shell */ /* */ /* CALLS */ /* */ /* CSC_Place_On_List Place on suspend list */ /* CSC_Priority_Place_On_List Place on priority list */ /* [HIC_Make_History_Entry] Make entry in history log */ /* TCC_Suspend_Task Suspend calling task */ /* TCC_Task_Priority Obtain task's priority */ /* [TCT_Check_Stack] Stack checking function */ /* TCT_Current_Thread Pickup current thread pointer*/ /* TCT_System_Protect Protect semaphore */ /* TCT_Unprotect Release protection */ /* */ /* INPUTS */ /* */ /* semaphore_ptr Semaphore control block ptr */ /* suspend Suspension option if full */ /* */ /* OUTPUTS */ /* */ /* NU_SUCCESS If service is successful */ /* NU_UNAVAILABLE If an instance of the */ /* semaphore is not available */ /* NU_TIMEOUT If timeout on service */ /* NU_SEMAPHORE_DELETED If semaphore deleted during */ /* suspension */ /* NU_SEMAPHORE_RESET If semaphore reset during */ /* suspension */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1993 Created initial version 1.0 */ /* 04-19-1993 Verified version 1.0 */ /* 03-01-1994 Changed function interfaces to */ /* match those in prototype, */ /* added register options, changed */ /* protection logic to reduce */ /* overhead, resulting in */ /* version 1.1 */ /* */ /* 03-18-1994 Verified version 1.1 */ /* */ /*************************************************************************/ STATUS SMC_Obtain_Semaphore(NU_SEMAPHORE *semaphore_ptr, UNSIGNED suspend) { R1 SM_SCB *semaphore; /* Semaphore control blk ptr */ R2 SM_SUSPEND *suspend_ptr; /* Suspend block pointer */ SM_SUSPEND suspend_block; /* Allocate suspension block */ TC_TCB *task; /* Task pointer */ STATUS status; /* Completion status */ NU_SUPERV_USER_VARIABLES /* Switch to supervisor mode */ NU_SUPERVISOR_MODE(); /* Move input semaphore pointer into internal pointer. */ semaphore = (SM_SCB *) semaphore_ptr; #ifdef NU_ENABLE_STACK_CHECK /* Call stack checking function to check for an overflow condition. */ TCT_Check_Stack(); #endif #ifdef NU_ENABLE_HISTORY /* Make an entry that corresponds to this function in the system history log. */ HIC_Make_History_Entry(NU_OBTAIN_SEMAPHORE_ID, (UNSIGNED) semaphore, (UNSIGNED) suspend, (UNSIGNED) 0); #endif /* Initialize the status as successful. */ status = NU_SUCCESS; /* Protect against simultaneous access to the semaphore. */ TCT_System_Protect(); /* Determine if the semaphore has an instance (can be decremented). */ if (semaphore -> sm_semaphore_count) { /* Semaphore available. Decrement and return to the caller. */ semaphore -> sm_semaphore_count--; #ifdef INCLUDE_PROVIEW _RTProf_DumpSema(RT_PROF_OBTAIN_SEMAPHORE,semaphore, RT_PROF_OK); #endif } else { /* Semaphore is not available. Determine if suspension is required. */ if (suspend) { /* Suspension is selected. */ /* Increment the number of tasks waiting. */ semaphore -> sm_tasks_waiting++; #ifdef INCLUDE_PROVIEW _RTProf_DumpSema(RT_PROF_OBTAIN_SEMAPHORE,semaphore , RT_PROF_WAIT); #endif /* Setup the suspend block and suspend the calling task. */ suspend_ptr = &suspend_block; suspend_ptr -> sm_semaphore = semaphore; suspend_ptr -> sm_suspend_link.cs_next = NU_NULL; suspend_ptr -> sm_suspend_link.cs_previous = NU_NULL; task = (TC_TCB *) TCT_Current_Thread(); suspend_ptr -> sm_suspended_task = task; /* Determine if priority or FIFO suspension is associated with the semaphore. */ if (semaphore -> sm_fifo_suspend) { /* FIFO suspension is required. Link the suspend block into the list of suspended tasks on this semaphore. */ CSC_Place_On_List((CS_NODE **) &(semaphore -> sm_suspension_list), &(suspend_ptr -> sm_suspend_link)); } else { /* Get the priority of the current thread so the suspend block can be placed in the appropriate place. */ suspend_ptr -> sm_suspend_link.cs_priority = TCC_Task_Priority(task); CSC_Priority_Place_On_List((CS_NODE **) &(semaphore -> sm_suspension_list), &(suspend_ptr -> sm_suspend_link)); } /* Finally, suspend the calling task. Note that the suspension call automatically clears the protection on the semaphore. */ TCC_Suspend_Task((NU_TASK *) task, NU_SEMAPHORE_SUSPEND, SMC_Cleanup, suspend_ptr, suspend); /* Pickup the return status. */ status = suspend_ptr -> sm_return_status; } else { /* No suspension requested. Simply return an error status. */ status = NU_UNAVAILABLE; #ifdef INCLUDE_PROVIEW _RTProf_DumpSema(RT_PROF_OBTAIN_SEMAPHORE, semaphore,RT_PROF_FAIL); #endif } } /* Release protection against access to the semaphore. */ TCT_Unprotect(); /* Return to user mode */ NU_USER_MODE(); /* Return the completion status. */ return(status); } /*************************************************************************/ /* */ /* FUNCTION */ /* */ /* SMC_Release_Semaphore */ /* */ /* DESCRIPTION */ /* */ /* This function releases a previously obtained semaphore. If one */ /* or more tasks are waiting, the first task is given the released */ /* instance of the semaphore. Otherwise, the semaphore instance */ /* counter is simply incremented. */ /* */ /* CALLED BY */ /* */ /* Application */ /* SMCE_Release_Semaphore Error checking shell */ /* */ /* CALLS */ /* */ /* CSC_Remove_From_List Remove from suspend list */ /* [HIC_Make_History_Entry] Make entry in history log */ /* TCC_Resume_Task Resume a suspended task */ /* [TCT_Check_Stack] Stack checking function */ /* TCT_Control_To_System Transfer control to system */ /* TCT_System_Protect Protect semaphore */ /* TCT_Unprotect Release protection */ /* */ /* INPUTS */ /* */ /* semaphore_ptr Semaphore control block ptr */ /* */ /* OUTPUTS */ /* */ /* NU_SUCCESS */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1993 Created initial version 1.0 */ /* 04-19-1993 Verified version 1.0 */ /* 03-01-1994 Changed function interfaces to */ /* match those in prototype, */ /* added register options, changed */ /* protection logic to reduce */ /* overhead, resulting in */ /* version 1.1 */ /* */ /* 03-18-1994 Verified version 1.1 */ /* */ /*************************************************************************/ STATUS SMC_Release_Semaphore(NU_SEMAPHORE *semaphore_ptr) { R1 SM_SCB *semaphore; /* Semaphore control blk ptr */ R2 SM_SUSPEND *suspend_ptr; /* Pointer to suspend block */ STATUS preempt; /* Preemption flag */ STATUS status; /* Completion status */ NU_SUPERV_USER_VARIABLES /* Switch to supervisor mode */ NU_SUPERVISOR_MODE(); /* Move input semaphore pointer into internal pointer. */ semaphore = (SM_SCB *) semaphore_ptr; #ifdef NU_ENABLE_STACK_CHECK /* Call stack checking function to check for an overflow condition. */ TCT_Check_Stack(); #endif #ifdef NU_ENABLE_HISTORY /* Make an entry that corresponds to this function in the system history log. */ HIC_Make_History_Entry(NU_RELEASE_SEMAPHORE_ID, (UNSIGNED) semaphore, (UNSIGNED) 0, (UNSIGNED) 0); #endif /* Initialize the status as successful. */ status = NU_SUCCESS; /* Protect against simultaneous access to the semaphore. */ TCT_System_Protect(); /* Determine if another task is waiting on the semaphore. */ if (semaphore -> sm_tasks_waiting) { /* Yes, another task is waiting for an instance of the semaphore. */ /* Decrement the number of tasks waiting counter. */ semaphore -> sm_tasks_waiting--; #ifdef INCLUDE_PROVIEW _RTProf_DumpSema(RT_PROF_RELEASE_SEMAPHORE, semaphore,RT_PROF_OK); #endif /* Remove the first suspended block from the list. */ suspend_ptr = semaphore -> sm_suspension_list; CSC_Remove_From_List((CS_NODE **) &(semaphore -> sm_suspension_list), &(suspend_ptr -> sm_suspend_link)); /* Setup the appropriate return value. */ suspend_ptr -> sm_return_status = NU_SUCCESS; /* Resume the suspended task. */ preempt = TCC_Resume_Task((NU_TASK *) suspend_ptr -> sm_suspended_task, NU_SEMAPHORE_SUSPEND); /* Determine if a preempt condition is present. */ if (preempt) /* Transfer control to the system if the resumed task function detects a preemption condition. */ TCT_Control_To_System(); } else { /* Increment the semaphore instance counter. */ semaphore -> sm_semaphore_count++; #ifdef INCLUDE_PROVIEW _RTProf_DumpSema(RT_PROF_RELEASE_SEMAPHORE, semaphore,RT_PROF_OK); #endif } /* Release protection against access to the semaphore. */ TCT_Unprotect(); /* Return to user mode */ NU_USER_MODE(); /* Return the completion status. */ return(status); } /*************************************************************************/ /* */ /* FUNCTION */ /* */ /* SMC_Cleanup */ /* */ /* DESCRIPTION */ /* */ /* This function is responsible for removing a suspension block */ /* from a semaphore. It is not called unless a timeout or a task */ /* terminate is in progress. Note that protection is already in */ /* effect - the same protection at suspension time. This routine */ /* must be called from Supervisor mode in Supervisor/User mode */ /* switching kernels. */ /* */ /* CALLED BY */ /* */ /* TCC_Timeout Task timeout */ /* TCC_Terminate Task terminate */ /* */ /* CALLS */ /* */ /* CSC_Remove_From_List Remove suspend block from */ /* the suspension list */ /* */ /* INPUTS */ /* */ /* information Pointer to suspend block */ /* */ /* OUTPUTS */ /* */ /* None */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1993 Created initial version 1.0 */ /* 04-19-1993 Verified version 1.0 */ /* */ /*************************************************************************/ VOID SMC_Cleanup(VOID *information) { SM_SUSPEND *suspend_ptr; /* Suspension block pointer */ NU_SUPERV_USER_VARIABLES /* Switch to supervisor mode */ NU_SUPERVISOR_MODE(); /* Use the information pointer as a suspend pointer. */ suspend_ptr = (SM_SUSPEND *) information; /* By default, indicate that the service timed-out. It really does not matter if this function is called from a terminate request since the task does not resume. */ suspend_ptr -> sm_return_status = NU_TIMEOUT; /* Decrement the number of tasks waiting counter. */ (suspend_ptr -> sm_semaphore) -> sm_tasks_waiting--; /* Unlink the suspend block from the suspension list. */ CSC_Remove_From_List((CS_NODE **) &((suspend_ptr -> sm_semaphore) -> sm_suspension_list), &(suspend_ptr -> sm_suspend_link)); /* Return to user mode */ NU_USER_MODE(); }