/*
 * Kernel initialization code
 */

#include <assert.h>
#include <ctype.h>

#include "winbase.h"
#include "wine/winbase16.h"

#include "module.h"
#include "task.h"
#include "selectors.h"
#include "miscemu.h"
#include "global.h"

extern void CODEPAGE_Init(void);
extern BOOL THUNK_Init(void);
extern void COMM_Init(void);


/***********************************************************************
 *           KERNEL process initialisation routine
 */
static BOOL process_attach(void)
{
    HMODULE16 hModule;
    STARTUPINFOA startup_info;
    UINT cmdShow = 1; /* SW_SHOWNORMAL but we don't want to include winuser.h here */

    /* Setup codepage info */
    CODEPAGE_Init();

    /* Initialize thunking */
    if (!THUNK_Init()) return FALSE;

    /* Initialize DOS memory */
    if (!DOSMEM_Init(0)) return FALSE;

    if ((hModule = LoadLibrary16( "krnl386.exe" )) < 32) return FALSE;

    /* Initialize special KERNEL entry points */

    /* Initialize KERNEL.178 (__WINFLAGS) with the correct flags value */
    NE_SetEntryPoint( hModule, 178, GetWinFlags16() );

    /* Initialize KERNEL.454/455 (__FLATCS/__FLATDS) */
    NE_SetEntryPoint( hModule, 454, __get_cs() );
    NE_SetEntryPoint( hModule, 455, __get_ds() );

    /* Initialize KERNEL.THHOOK */
    TASK_InstallTHHook((THHOOK *)PTR_SEG_TO_LIN((SEGPTR)GetProcAddress16( hModule, (LPCSTR)332 )));

    /* Initialize the real-mode selector entry points */
#define SET_ENTRY_POINT( num, addr ) \
    NE_SetEntryPoint( hModule, (num), GLOBAL_CreateBlock( GMEM_FIXED, \
                      DOSMEM_MapDosToLinear(addr), 0x10000, hModule, \
                      WINE_LDT_FLAGS_DATA ))

    SET_ENTRY_POINT( 174, 0xa0000 );  /* KERNEL.174: __A000H */
    SET_ENTRY_POINT( 181, 0xb0000 );  /* KERNEL.181: __B000H */
    SET_ENTRY_POINT( 182, 0xb8000 );  /* KERNEL.182: __B800H */
    SET_ENTRY_POINT( 195, 0xc0000 );  /* KERNEL.195: __C000H */
    SET_ENTRY_POINT( 179, 0xd0000 );  /* KERNEL.179: __D000H */
    SET_ENTRY_POINT( 190, 0xe0000 );  /* KERNEL.190: __E000H */
    NE_SetEntryPoint( hModule, 183, DOSMEM_0000H );       /* KERNEL.183: __0000H */
    NE_SetEntryPoint( hModule, 173, DOSMEM_BiosSysSeg );  /* KERNEL.173: __ROMBIOS */
    NE_SetEntryPoint( hModule, 193, DOSMEM_BiosDataSeg ); /* KERNEL.193: __0040H */
    NE_SetEntryPoint( hModule, 194, DOSMEM_BiosSysSeg );  /* KERNEL.194: __F000H */
#undef SET_ENTRY_POINT

    /* Force loading of some dlls */
    if (LoadLibrary16( "system" ) < 32) return FALSE;

    /* Initialize communications */
    COMM_Init();

    /* Read DOS config.sys */
    if (!DOSCONF_ReadConfig()) return FALSE;

    /* Create 16-bit task */
    GetStartupInfoA( &startup_info );
    if (startup_info.dwFlags & STARTF_USESHOWWINDOW) cmdShow = startup_info.wShowWindow;
    if (!TASK_Create( (NE_MODULE *)GlobalLock16( MapHModuleLS(GetModuleHandleA(0)) ),
                      cmdShow, NtCurrentTeb(), NULL, 0 ))
        return FALSE;

    return TRUE;
}

/***********************************************************************
 *           KERNEL initialisation routine
 */
BOOL WINAPI MAIN_KernelInit( HINSTANCE hinst, DWORD reason, LPVOID reserved )
{
    switch(reason)
    {
    case DLL_PROCESS_ATTACH:
        return process_attach();
    case DLL_PROCESS_DETACH:
        WriteOutProfiles16();
        break;
    }
    return TRUE;
}

/***********************************************************************
 *		KERNEL_nop
 *
 * Entry point for kernel functions that do nothing.
 */
LONG WINAPI KERNEL_nop(void) { return 0; }


/***************************************************************************
 *
 * Win 2.x string functions now moved to USER
 *
 * We rather want to implement them here instead of doing Callouts
 */

/***********************************************************************
 *		KERNEL_AnsiNext16
 */
SEGPTR WINAPI KERNEL_AnsiNext16(SEGPTR current)
{
    return (*(char *)PTR_SEG_TO_LIN(current)) ? current + 1 : current;
}

/***********************************************************************
 *		KERNEL_AnsiPrev16
 */	
SEGPTR WINAPI KERNEL_AnsiPrev16( SEGPTR start, SEGPTR current )
{
    return (current==start)?start:current-1;
}

/***********************************************************************
 *		KERNEL_AnsiUpper16
 */
SEGPTR WINAPI KERNEL_AnsiUpper16( SEGPTR strOrChar )
{
    /* uppercase only one char if strOrChar < 0x10000 */
    if (HIWORD(strOrChar))
    {
	char *s = PTR_SEG_TO_LIN(strOrChar);
	while (*s) {
	    *s = toupper(*s);
	    s++;
	}
        return strOrChar;
    }
    else return toupper((char)strOrChar);
}

/***********************************************************************
 *		KERNEL_AnsiLower16
 */
SEGPTR WINAPI KERNEL_AnsiLower16( SEGPTR strOrChar )
{
    /* lowercase only one char if strOrChar < 0x10000 */
    if (HIWORD(strOrChar))
    {
        char *s = PTR_SEG_TO_LIN(strOrChar);
	while (*s) {
	    *s = tolower(*s);
	    s++;
	}
        return strOrChar;
    }
    else return tolower((char)strOrChar);
}