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.
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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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