FreeCalypso > hg > fc-tourmaline
diff src/nucleus/iof.c @ 0:4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Fri, 16 Oct 2020 06:23:26 +0000 |
| parents | |
| children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/nucleus/iof.c Fri Oct 16 06:23:26 2020 +0000 @@ -0,0 +1,240 @@ +/*************************************************************************/ +/* */ +/* 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 */ +/* */ +/* iof.c Nucleus PLUS 1.14 */ +/* */ +/* COMPONENT */ +/* */ +/* IO - Input/Output Driver Management */ +/* */ +/* DESCRIPTION */ +/* */ +/* This file contains routines to obtain facts about the I/O Driver */ +/* Management component. */ +/* */ +/* DATA STRUCTURES */ +/* */ +/* None */ +/* */ +/* FUNCTIONS */ +/* */ +/* IOF_Established_Drivers Return total number of I/O */ +/* drivers */ +/* IOF_Driver_Pointers Return list of I/O driver */ +/* pointers */ +/* */ +/* DEPENDENCIES */ +/* */ +/* cs_extr.h Common Service functions */ +/* tc_extr.h Thread Control functions */ +/* io_extr.h I/O driver functions */ +/* hi_extr.h History functions */ +/* */ +/* HISTORY */ +/* */ +/* DATE REMARKS */ +/* */ +/* 03-01-1994 Initial version of I/O driver */ +/* fact service file, 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 "io_extr.h" /* I/O driver functions */ +#include "hi_extr.h" /* History functions */ + +/* Define external inner-component global data references. */ + +extern CS_NODE *IOD_Created_Drivers_List; +extern UNSIGNED IOD_Total_Drivers; +extern TC_PROTECT IOD_List_Protect; + + + +/*************************************************************************/ +/* */ +/* FUNCTION */ +/* */ +/* IOF_Established_Drivers */ +/* */ +/* DESCRIPTION */ +/* */ +/* This function returns the current number of established I/O */ +/* drivers. I/O drivers previously deleted are no longer */ +/* considered established. */ +/* */ +/* CALLED BY */ +/* */ +/* Application */ +/* */ +/* CALLS */ +/* */ +/* [TCT_Check_Stack] Stack checking function */ +/* */ +/* INPUTS */ +/* */ +/* None */ +/* */ +/* OUTPUTS */ +/* */ +/* IOD_Total_Drivers Number of established I/O */ +/* drivers */ +/* */ +/* HISTORY */ +/* */ +/* DATE REMARKS */ +/* */ +/* 03-01-1993 Created initial version 1.0 */ +/* 04-19-1993 Verified version 1.0 */ +/* 03-01-1994 Changed function interface, */ +/* resulting in version 1.1 */ +/* */ +/* 03-18-1994 Verified version 1.1 */ +/* */ +/*************************************************************************/ +UNSIGNED IOF_Established_Drivers(VOID) +{ + + +#ifdef NU_ENABLE_STACK_CHECK + + /* Call stack checking function to check for an overflow condition. */ + TCT_Check_Stack(); + +#endif + + /* Return the number of established I/O drivers. */ + return(IOD_Total_Drivers); +} + + +/*************************************************************************/ +/* */ +/* FUNCTION */ +/* */ +/* IOF_Driver_Pointers */ +/* */ +/* DESCRIPTION */ +/* */ +/* This function builds a list of driver pointers, starting at the */ +/* specified location. The number of driver pointers placed in */ +/* the list is equivalent to the total number of drivers or the */ +/* maximum number of pointers specified in the call. */ +/* */ +/* CALLED BY */ +/* */ +/* Application */ +/* */ +/* CALLS */ +/* */ +/* [TCT_Check_Stack] Stack checking function */ +/* TCT_Protect Protect created list */ +/* TCT_Unprotect Release protection */ +/* */ +/* INPUTS */ +/* */ +/* pointer_list Pointer to the list area */ +/* maximum_pointers Maximum number of pointers */ +/* */ +/* OUTPUTS */ +/* */ +/* pointers Number of I/O driver pointers*/ +/* placed in the list */ +/* */ +/* 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 Changed function interface, */ +/* resulting in version 1.1 */ +/* */ +/* 03-18-1994 Verified version 1.1 */ +/* */ +/*************************************************************************/ +UNSIGNED IOF_Driver_Pointers(NU_DRIVER **pointer_list, + UNSIGNED maximum_pointers) +{ +CS_NODE *node_ptr; /* Pointer to each NU_DRIVER */ +UNSIGNED pointers; /* Number of pointers in list*/ +NU_SUPERV_USER_VARIABLES + + /* Switch to supervisor mode */ + NU_SUPERVISOR_MODE(); + +#ifdef NU_ENABLE_STACK_CHECK + + /* Call stack checking function to check for an overflow condition. */ + TCT_Check_Stack(); + +#endif + + /* Initialize the number of pointers returned. */ + pointers = 0; + + /* Protect against access to the list of created I/O drivers. */ + TCT_Protect(&IOD_List_Protect); + + /* Loop until all driver pointers are in the list or until the maximum + list size is reached. */ + node_ptr = IOD_Created_Drivers_List; + while ((node_ptr) && (pointers < maximum_pointers)) + { + + /* Place the node into the destination list. */ + *pointer_list++ = (NU_DRIVER *) node_ptr; + + /* Increment the pointers variable. */ + pointers++; + + /* Position the node pointer to the next node. */ + node_ptr = node_ptr -> cs_next; + + /* Determine if the pointer is at the head of the list. */ + if (node_ptr == IOD_Created_Drivers_List) + + /* The list search is complete. */ + node_ptr = NU_NULL; + } + + /* Release protection against access to the list of created drivers. */ + TCT_Unprotect(); + + /* Return to user mode */ + NU_USER_MODE(); + + /* Return the number of pointers in the list. */ + return(pointers); +} + + + + + +