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/****************************************************************************

*

*                            Open Watcom Project

*

*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.

*

*  ========================================================================

*

*    This file contains Original Code and/or Modifications of Original

*    Code as defined in and that are subject to the Sybase Open Watcom

*    Public License version 1.0 (the 'License'). You may not use this file

*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO

*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is

*    provided with the Original Code and Modifications, and is also

*    available at www.sybase.com/developer/opensource.

*

*    The Original Code and all software distributed under the License are

*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER

*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM

*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF

*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR

*    NON-INFRINGEMENT. Please see the License for the specific language

*    governing rights and limitations under the License.

*

*  ========================================================================

*

* Description:  Initialization and termination of clib.

*

****************************************************************************/

#include "variety.h"

#include "initfini.h"

#include "rtinit.h"

#define PNEAR ((__type_rtp)0)

#define PFAR  ((__type_rtp)1)

#define PDONE ((__type_rtp)2)

#if ( COMP_CFG_COFF == 1 ) || defined(__AXP__) || defined(__PPC__) || defined(__MIPS__)

    // following is an attempt to drop the need for an assembler

    // segment definitions file

    // unfortunately, the use of XIB,XIE,YIB,YIE doesn't get the

    // right sort of segments by default

    #pragma data_seg( ".rtl$xib", "DATA" );

    YIXI( TS_SEG_XIB, _Start_XI, 0, 0 )

    #pragma data_seg( ".rtl$xie", "DATA" );

    YIXI( TS_SEG_XIE, _End_XI, 0, 0 )

    #pragma data_seg( ".rtl$yib", "DATA" );

    YIXI( TS_SEG_YIB, _Start_YI, 0, 0 )

    #pragma data_seg( ".rtl$yie", "DATA" );

    YIXI( TS_SEG_YIE, _End_YI, 0, 0 )

    #pragma data_seg( ".data", "DATA" );

#elif defined(_M_IX86)

    extern struct rt_init _Start_XI;

    extern struct rt_init _End_XI;

    extern struct rt_init _Start_YI;

    extern struct rt_init _End_YI;

#else

    #error unsupported platform

#endif

typedef void (*pfn)(void);

typedef void (_WCI86FAR * _WCI86FAR fpfn)(void);

typedef void (_WCI86NEAR * _WCI86NEAR npfn)(void);

#if defined(__AXP__) || defined(__PPC__) || defined(__MIPS__)

    #define __GETDS()

    #define save_ds()

    #define restore_ds()

    #define save_es()

    #define restore_es()

    #define setup_es()

#elif defined(__WINDOWS_386__)

    #define __GETDS()

    #define save_ds()

    #define restore_ds()

    #define save_es()

    #define restore_es()

    #define setup_es()

#elif defined(__386__)

    #define __GETDS()

    #define save_ds()

    #define restore_ds()

#if defined(__FLAT__)

    #define save_es()

    #define restore_es()

    #define setup_es()

#else

    extern void save_es( void );

    #pragma aux save_es = modify exact [es];

    extern void restore_es( void );

    #pragma aux restore_es = modify exact [es];

    extern void setup_es( void );

    #pragma aux setup_es = \

                "push ds" \

                "pop es" \

                modify exact [es];

#endif

#elif defined(M_I86)

    extern void save_dx( void );

    #pragma aux save_dx = modify exact [dx];

    extern void _WCI86NEAR __GETDS( void );

    #pragma aux __GETDS "__GETDS";

    extern void save_ds( void );

    #pragma aux save_ds = "push ds" modify exact [sp];

    extern void restore_ds( void );

    #pragma aux restore_ds = "pop ds" modify exact [sp];

    #define save_es()

    #define restore_es()

#else

    #error unsupported platform

#endif

#if defined(M_I86)

static void callit_near( npfn *f ) {

    // don't call a null pointer

    if( *f ) {

        save_dx();

        save_ds();

        // call function

        (void)(**f)();

        restore_ds();

    }

}

static void callit_far( fpfn _WCI86NEAR *f ) {

    // don't call a null pointer

    if( *f ) {

        save_ds();

        // call function

        (void)(**f)();

        restore_ds();

    }

}

#else

static void callit( pfn *f ) {

    // don't call a null pointer

    if( *f ) {

        // QNX needs es==ds

        setup_es();

        // call function

        (void)(**f)();

    }

}

#endif

/*

; - takes priority limit parm in eax, code will run init routines whose

;       priority is < eax (really al [0-255])

;       eax==255 -> run all init routines

;       eax==15  -> run init routines whose priority is <= 15

;

*/

void __InitRtns( unsigned limit ) {

    __type_rtp local_limit;

    struct rt_init _WCI86NEAR *pnext;

    save_ds();

    save_es();

    __GETDS();

    local_limit = (__type_rtp)limit;

    for(;;) {

        {

            __type_rtp working_limit;

            struct rt_init _WCI86NEAR *pcur;

            pcur = (struct rt_init _WCI86NEAR*)&_Start_XI;

            #if defined(COMP_CFG_COFF)

                pcur++;

            #endif

            pnext = (struct rt_init _WCI86NEAR*)&_End_XI;

            working_limit = local_limit;

            // walk list of routines

            while( pcur < (struct rt_init _WCI86NEAR*)&_End_XI )

            {

                // if this one hasn't been called

                if( pcur->rtn_type != PDONE ) {

                    // if the priority is better than best so far

                    if( pcur->priority <= working_limit )

                    {

                        // remember this one

                        pnext = pcur;

                        working_limit = pcur->priority;

                    }

                }

                // advance to next entry

                pcur++;

            }

            // check to see if all done, if we didn't find any

            // candidates then we can return

            if( pnext == (struct rt_init _WCI86NEAR*)&_End_XI ) {

                break;

            }

        }

#if defined(M_I86)

        if( pnext->rtn_type == PNEAR ) {

            callit_near( (npfn *)&pnext->rtn );

        } else {

            callit_far( (fpfn _WCI86NEAR *)&pnext->rtn );

        }

#else

        callit( &pnext->rtn );

#endif

        // mark entry as invoked

        pnext->rtn_type = PDONE;

    }

    restore_es();

    restore_ds();

}

/*

; - takes priority range parms in eax, edx, code will run fini routines whose

;       priority is >= eax (really al [0-255]) and <= edx (really dl [0-255])

;       eax==0,  edx=255 -> run all fini routines

;       eax==16, edx=255 -> run fini routines in range 16..255

;       eax==16, edx=40  -> run fini routines in range 16..40

*/

#if defined(M_I86)

void _WCI86FAR __FFiniRtns( unsigned min_limit, unsigned max_limit ) {

    __FiniRtns( min_limit, max_limit );

}

#endif

void __FiniRtns( unsigned min_limit, unsigned max_limit )

{

    __type_rtp local_min_limit;

    __type_rtp local_max_limit;

    struct rt_init _WCI86NEAR *pnext;

    save_ds();

    save_es();

    __GETDS();

    local_min_limit = (__type_rtp)min_limit;

    local_max_limit = (__type_rtp)max_limit;

    for(;;) {

        {

            __type_rtp working_limit;

            struct rt_init _WCI86NEAR *pcur;

            pcur = (struct rt_init _WCI86NEAR*)&_Start_YI;

            #if defined(COMP_CFG_COFF)

                pcur++;

            #endif

            pnext = (struct rt_init _WCI86NEAR*)&_End_YI;

            working_limit = local_min_limit;

            // walk list of routines

            while( pcur < (struct rt_init _WCI86NEAR*)&_End_YI )

            {

                // if this one hasn't been called

                if( pcur->rtn_type != PDONE ) {

                    // if the priority is better than best so far

                    if( pcur->priority >= working_limit )

                    {

                        // remember this one

                        pnext = pcur;

                        working_limit = pcur->priority;

                    }

                }

                // advance to next entry

                pcur++;

            }

            // check to see if all done, if we didn't find any

            // candidates then we can return

            if( pnext == (struct rt_init _WCI86NEAR*)&_End_YI ) {

                break;

            }

        }

        if( pnext->priority <= local_max_limit ) {

#if defined(M_I86)

            if( pnext->rtn_type == PNEAR ) {

                callit_near( (npfn *)&pnext->rtn );

            } else {

                callit_far( (fpfn _WCI86NEAR *)&pnext->rtn );

            }

#else

            callit( &pnext->rtn );

#endif

        }

        // mark entry as invoked even if we don't call it

        // if we didn't call it, it is because we don't want to

        // call finirtns with priority > max_limit, in that case

        // marking the function as called, won't hurt anything

        pnext->rtn_type = PDONE;

    }

    restore_es();

    restore_ds();

}