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the foreground and background colours. In bitblt_text functions, compare values to this cache and don't re-draw the characters if they haven't changed. When invalidating the display, clear this cache in order to force characters to be redrawn; also force full redraws between suspend/resume pairs since odd artifacts can otherwise result. When scrolling the display (which is where most time is spent within the vt driver) this yields a significant performance improvement if most lines are less than the width of the terminal, since this avoids re-drawing blanks on top of blanks. (Note that "re-drawing" here includes writing to the VGA text mode buffer; on virtualized systems this can be extremely slow since it triggers a glyph being rendered onto a 640x480 screen). On a c5.4xlarge EC2 instance (with emulated text mode VGA) this cuts the time spent in vt(4) during the kernel boot from 1200 ms to 700ms; on my laptop (with a 3200x1800 display) the corresponding time is reduced from 970 ms down to 155 ms. Reviewed by: imp, cem Approved by: re (gjb) Relnotes: Significant speedup in vt(4) and the system boot generally. Differential Revision: https://reviews.freebsd.org/D16723
55 lines
2.2 KiB
C
55 lines
2.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2013 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Aleksandr Rybalko under sponsorship from the
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* FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _DEV_VT_HW_FB_VT_FB_H_
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#define _DEV_VT_HW_FB_VT_FB_H_
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/* Generic framebuffer interface call vt_fb_attach to init VT(9) */
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int vt_fb_attach(struct fb_info *info);
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void vt_fb_resume(struct vt_device *vd);
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void vt_fb_suspend(struct vt_device *vd);
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int vt_fb_detach(struct fb_info *info);
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vd_init_t vt_fb_init;
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vd_fini_t vt_fb_fini;
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vd_blank_t vt_fb_blank;
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vd_bitblt_text_t vt_fb_bitblt_text;
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vd_invalidate_text_t vt_fb_invalidate_text;
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vd_bitblt_bmp_t vt_fb_bitblt_bitmap;
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vd_drawrect_t vt_fb_drawrect;
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vd_setpixel_t vt_fb_setpixel;
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vd_postswitch_t vt_fb_postswitch;
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vd_fb_ioctl_t vt_fb_ioctl;
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vd_fb_mmap_t vt_fb_mmap;
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#endif /* _DEV_VT_HW_FB_VT_FB_H_ */
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