If booted in frame buffer mode, board-qemu currently calls hv-logical-load
and hv-logical-store for every pixel when enabling or disabling the cursor.
This is suboptimal when writing one char at a time to the console since
terminal-write always toggles the cursor. And this is precisely what grub
is doing when the user wants to edit a menu entry... the result is an
incredibly slow and barely usable interface.
This series introduces per-board helpers to be used by the frame buffer
code, so that board-qemu may have its own accelarated implementation:
- the first patch is preliminary cleanup, before moving code out to helpers.
- the second patch introduces a helper to invert a memory region byte-per-byte:
this fixes the unbearable slowliness of grub editing mode.
- the third patch introduces a similar helper with a a quad-word pace: it
doesn't bring any speed improvement since board-qemu already uses
hv-logical-memop, but it allows to "unify hcall-invert-screen and
fb8-invert-screen again".
Please comment.
---
Greg Kurz (3):
fbuffer: simplify address computations in fb8-toggle-cursor
fbuffer: introduce the invert-region helper
fbuffer: introduce the invert-region-x helper
board-js2x/slof/helper.fs | 9 +++++++++
board-qemu/slof/helper.fs | 7 +++++++
board-qemu/slof/pci-device_1234_1111.fs | 10 +---------
slof/fs/fbuffer.fs | 8 +++-----
4 files changed, 20 insertions(+), 14 deletions(-)
--
Greg
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