Date: Tue, 19 Feb 2013 20:57:53 +0100 From: Phileas Fogg <phileas-fogg@mail.ru> To: Oleksandr Tymoshenko <gonzo@freebsd.org> Cc: freebsd-hackers@freebsd.org Subject: Re: Scrolling in framebuffer syscons Message-ID: <5123D941.2050906@mail.ru> In-Reply-To: <51217854.8000508@freebsd.org> References: <511F879C.3030801@mail.ru> <51217854.8000508@freebsd.org>
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Oleksandr Tymoshenko wrote: > On 2/16/2013 5:20 AM, Phileas Fogg wrote: >> Hi, >> >> i have a question about how the scrolling in a framebuffer syscons works. >> I'm trying to speed up the syscons on the PS3 console which is a simple >> framebuffer syscons. >> It uses the renderer _gfbrndrsw_ (see dev/syscons/scgfbrndr.c) to draw into >> the framebuffer of the PS3 console. >> The _gfb_draw_ function implements a simple scrolling that moves data from >> bottom to top with _vidd_copy_. >> And that's where i have a problem because _vidd_copy_ calls the function >> _ps3fb_copy_ (see powerpc/ps3/ps3_syscons.c). >> But the function _ps3fb_copy_ is NOT implemented yet. So, the question is how >> does the scrolling work then ? >> I took a look at other syscons implementation based on a framebuffer, and >> almost all of them do NOT implement _vidd_copy_ >> function, e.g. XBOX syscons. > > I think driver re-renders whole screen character by character. That's why no > copy operation is invoked. > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" You are right, syscons is using the teken terminal emulator which implements scrolling in software. The vidd_copy callback is never called. To optimize the PS3 syscons driver, i have to speed up vidd_puts and vidd_putc callbacks. regards
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