symbian-qemu-0.9.1-12/libsdl-trunk/src/video/ataricommon/SDL_xbiosinterrupt.S
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     1 /*
       
     2     SDL - Simple DirectMedia Layer
       
     3     Copyright (C) 1997-2006 Sam Lantinga
       
     4 
       
     5     This library is free software; you can redistribute it and/or
       
     6     modify it under the terms of the GNU Lesser General Public
       
     7     License as published by the Free Software Foundation; either
       
     8     version 2.1 of the License, or (at your option) any later version.
       
     9 
       
    10     This library is distributed in the hope that it will be useful,
       
    11     but WITHOUT ANY WARRANTY; without even the implied warranty of
       
    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
       
    13     Lesser General Public License for more details.
       
    14 
       
    15     You should have received a copy of the GNU Lesser General Public
       
    16     License along with this library; if not, write to the Free Software
       
    17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
       
    18 
       
    19     Sam Lantinga
       
    20     slouken@libsdl.org
       
    21 */
       
    22 
       
    23 /*
       
    24  *	XBIOS mouse & joystick vectors
       
    25  *
       
    26  *	Patrice Mandin
       
    27  */
       
    28 
       
    29 	.text
       
    30 
       
    31 	.globl	_SDL_AtariXbios_Install
       
    32 	.globl	_SDL_AtariXbios_Restore
       
    33 	.globl	_SDL_AtariXbios_MouseVector
       
    34 	.globl	_SDL_AtariXbios_JoystickVector
       
    35 
       
    36 	.globl	_SDL_AtariXbios_mouselock
       
    37 	.globl	_SDL_AtariXbios_mouseb
       
    38 	.globl	_SDL_AtariXbios_mousex
       
    39 	.globl	_SDL_AtariXbios_mousey
       
    40 	.globl	_SDL_AtariXbios_joystick
       
    41 
       
    42 /*--- Vector installer ---*/
       
    43 
       
    44 _SDL_AtariXbios_Install:
       
    45 	movel	sp@(4),a0
       
    46 
       
    47 	/* Stop interrupts */
       
    48 
       
    49 	movew	#0x2700,sr
       
    50 
       
    51 	/* Save old mouse vector, set our routine */
       
    52 
       
    53 	clrl	oldmousevector
       
    54 	movel	sp@(8),d0
       
    55 	beqs	no_new_mouse_vector
       
    56 	movel	a0@(16),oldmousevector
       
    57 	movel	d0,a0@(16)
       
    58 no_new_mouse_vector:
       
    59 
       
    60 	/* Save old joystick vector, set our routine */
       
    61 
       
    62 	clrl	oldjoystickvector
       
    63 	movel	sp@(12),d0
       
    64 	beqs	no_new_joystick_vector
       
    65 	movel	a0@(24),oldjoystickvector
       
    66 	movel	d0,a0@(24)
       
    67 no_new_joystick_vector:
       
    68 
       
    69 	/* Restart interrupts */
       
    70 
       
    71 	movew	#0x2300,sr
       
    72 
       
    73 	rts
       
    74 
       
    75 /*--- Vector restorer ---*/
       
    76 
       
    77 _SDL_AtariXbios_Restore:
       
    78 	movel	sp@(4),a0
       
    79 
       
    80 	/* Stop interrupts */
       
    81 
       
    82 	movew	#0x2700,sr
       
    83 
       
    84 	/* Restore mouse vector */
       
    85 
       
    86 	movel	oldmousevector,d0
       
    87 	beqs	no_restore_mouse
       
    88 	movel	d0,a0@(16)
       
    89 no_restore_mouse:
       
    90 
       
    91 	/* Restore joystick vector */
       
    92 
       
    93 	movel	oldjoystickvector,d0
       
    94 	beqs	no_restore_joystick
       
    95 	movel	d0,a0@(24)
       
    96 no_restore_joystick:
       
    97 
       
    98 	/* Restart interrupts */
       
    99 
       
   100 	movew	#0x2300,sr
       
   101 
       
   102 	rts
       
   103 
       
   104 /*--- Our mouse vector ---*/
       
   105 
       
   106 	.text
       
   107 	.even
       
   108 	.ascii "XBRA"
       
   109 	.ascii "LSDL"
       
   110 	.comm	oldmousevector,4*1
       
   111 _SDL_AtariXbios_MouseVector:
       
   112 	movel	d0,sp@-
       
   113 
       
   114 	/* Mouse buttons */
       
   115 	moveb	(a0),d0
       
   116 	andw	#3,d0
       
   117 	movew	d0,_SDL_AtariXbios_mouseb
       
   118 
       
   119 	/* X movement */
       
   120 	moveb	a0@(1),d0
       
   121 	extw	d0
       
   122 	addw	d0,_SDL_AtariXbios_mousex
       
   123 
       
   124 	/* Y movement */
       
   125 	moveb	a0@(2),d0
       
   126 	extw	d0
       
   127 	addw	d0,_SDL_AtariXbios_mousey
       
   128 
       
   129 	/* Lock mouse position ? */
       
   130 	tstw	_SDL_AtariXbios_mouselock
       
   131 	beq.s	no_mouse_lock
       
   132 	clrb	a0@(1)
       
   133 	clrb	a0@(2)
       
   134 no_mouse_lock:
       
   135 
       
   136 	/* Jump through old vector */
       
   137 	movel	sp@+,d0
       
   138 
       
   139 	movel	oldmousevector,sp@-
       
   140 	rts
       
   141 
       
   142 	.data
       
   143 	.even
       
   144 	.comm	_SDL_AtariXbios_mouselock,2*1
       
   145 	.comm	_SDL_AtariXbios_mousex,2*1
       
   146 	.comm	_SDL_AtariXbios_mousey,2*1
       
   147 	.comm	_SDL_AtariXbios_mouseb,2*1
       
   148 
       
   149 /*--- Our joystick vector ---*/
       
   150 
       
   151 	.text
       
   152 	.even
       
   153 	.ascii "XBRA"
       
   154 	.ascii "LSDL"
       
   155 	.comm	oldjoystickvector,4*1
       
   156 _SDL_AtariXbios_JoystickVector:
       
   157 	movel	d0,sp@-
       
   158 
       
   159 	/* New joystick state */
       
   160 	moveb	a0@(2),d0
       
   161 	andw	#0x8f,d0
       
   162 	movew	d0,_SDL_AtariXbios_joystick
       
   163 
       
   164 	/* Jump through old vector */
       
   165 	movel	sp@+,d0
       
   166 
       
   167 	movel	oldjoystickvector,sp@-
       
   168 	rts
       
   169 
       
   170 	.data
       
   171 	.even
       
   172 	.comm	_SDL_AtariXbios_joystick,2*1