libfbx-3dfx-misc.c

libfxb是linux下只写操作framebuffer的一个轻量级的库。

/*
 *  libfbx-3dfx-misc.c -- Miscellaneous routines for 3dfx optimizations
 *  (C)opyright 2001 U4X Labs
 *
 *  Written by: Michael Bourgeous <[e-mail]>
 *  		Paul Mundt        <[e-mail]>
 * 
 *  $Id: libfbx-3dfx-misc.c,v 1.7 2001/03/03 01:34:43 lethal Exp $
 *
 *  	This is the place for all the 3dfx hardware specific
 *  optimizations for the libfbx system to go.
 *
 *  See ChangeLog for modifications, CREDITS for credits.
 *
 *  All source herein is copyright U4X Labs and its original author. 
 *  Any code modifications or additions are (C)opyright the original 
 *  author and U4X Labs respectively.
 *
 *  libfbx is free software; you can redistribute it and/or modify it 
 *  under the terms of the GNU Lesser General Public License as 
 *  published by the Free Software Foundation; either version 2.1 of 
 *  the License, or (at your option) any later version.
 *
 *  libfbx is distributed in the hope that it will be useful, but 
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with libfbx; if not, write to the Free Software 
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 *  USA
 */
#include <libfbx/libfbx-drivers.h>
#include <libfbx/drivers/libfbx-3dfx.h>
#include <sched.h>

inline void seq_outb(__u32 idx, __u8 val)
{
	fb_outb(SEQ_I - 0x300, idx);
	fb_outb(SEQ_D - 0x300, val);
}

inline __u8 seq_inb(__u32 idx)
{
	fb_outb(SEQ_I - 0x300, idx);
	return fb_inb(SEQ_D - 0x300);
}

/*
 * Banshee specific?
 */
inline void tdfx_make_room(int size)
{
	while ((fb_inl(STATUS) & 0x1f) < size);
}

inline void tdfx_wait_idle()
{
	int i = 0;

	tdfx_make_room(1);
	fb_outl(COMMAND_3D, COMMAND_3D_NOP);

	while (1) {
		i = (fb_inl(STATUS) & STATUS_BUSY) ? 0 : i + 1;
		if (i == 3)
			break;
		sched_yield();
	}
}