/* VGAlib version 1.2 - (c) 1993 Tommy Frandsen */
/* */
/* This library is free software; you can redistribute it and/or */
/* modify it without any restrictions. This library is distributed */
/* in the hope that it will be useful, but without any warranty. */
/* Multi-chipset support Copyright 1993 Harm Hanemaayer */
/* partially copyrighted (C) 1993 by Hartmut Schirmer */
#include <stdlib.h>
#include "vga.h"
#include "libvga.h"
#include "driver.h"
#include "svgalib_helper.h"
vga_cardinfo
*vga_getcardinfo
(void) {
vga_cardinfo
*vci
;
vci
= malloc(sizeof(vga_cardinfo
));
if(vci
==NULL
) return vci
;
vci
->version
= 0x100;
vci
->size
= sizeof(vga_cardinfo
);
vci
->chipset
= __svgalib_chipset
;
vci
->physmem
= __svgalib_linear_mem_base
;
return vci
;
}
void vga_waitretrace
(void)
{
if (__svgalib_driverspecs
->emul
&& __svgalib_driverspecs
->emul
->waitretrace
) {
__svgalib_driverspecs
->emul
->waitretrace
();
} else {
while (!(__svgalib_inis1
() & 8));
while (__svgalib_inis1
() & 8);
}
}
static void *__svgalib_linearframebuffer
;
/*
* The way IS_LINEAR gets indicated is rather convoluted; if the driver
* has EXT_INFO_AVAILABLE, setlinearaddressing will enable
* the flag in __svgalib_linearset which gets set in the modeinfo by
* vga_getmodeinfo(). The driver must turn off the flag in
* __svgalib_linearset if linear addressing gets disabled (e.g. when
* setting another mode).
*
* For any driver, the chipset getmodeinfo flag can examine a hardware
* register and set the IS_LINEAR flag if linear addressing is enabled.
*/
unsigned char *
vga_getgraphmem
(void)
{
DTP
((stderr
,"getgraphmem\n"));
if (__svgalib_modeinfo_linearset
& LINEAR_MODE
)
return __svgalib_linearframebuffer
;
return GM
;
}
/*
* This function is to be called after a SVGA graphics mode set
* in banked mode. Probing in VGA-compatible textmode is not a good
* idea.
*/
/* cf. vga_waitretrace, M.Weller */
int vga_setlinearaddressing
(void)
{
int (*lfn
) (int op
, int param
) = __svgalib_driverspecs
->linear
;
vga_modeinfo
*modeinfo
;
printk
(KERN_INFO
"Setlinearaddressing\n");
modeinfo
= vga_getmodeinfo
(CM
);
if (!(modeinfo
->flags
&CAPABLE_LINEAR
)) return -1;
(*lfn
) (LINEAR_ENABLE
, 0);
__svgalib_linearframebuffer
= LINEAR_POINTER
;
if ((long) __svgalib_linearframebuffer
== -1) {
/* Shouldn't happen. */
(*lfn
) (LINEAR_DISABLE
, 0);
return -1;
}
__svgalib_modeinfo_linearset
|= IS_LINEAR
| LINEAR_MODE
;
graph_mem
= LINEAR_POINTER
;
return __svgalib_linear_mem_size
; /* Who cares? */
}