qemu /
SLOF /
59a135eb78378f1574549c93bbf421505576ec6e fbuffer: Implement MRMOVE as an accelerated primitive
The character drawing function fb8-draw-character uses "mrmove"
(which moves main memory contents to IO memory) to copy the data
of the character from main memory to the frame buffer. However,
the current implementation of "mrmove" performs quite badly on
board-qemu since it triggers a hypercall for each memory access
(e.g. for each 8 bytes that are transfered).
But since the KVMPPC_H_LOGICAL_MEMOP hypercall can transfer bigger
regions at once, we can accelerate the character drawing quite a
bit by simply mapping the "mrmove" to the same macro that is
already used for the "rmove" (which is normally only used for
copying from IO memory to IO memory, but on board-qemu it does
not matter). For keeping board-js2x in sync, this patch also
transforms the "mrmove" for js2x into primitives.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
5 files changed
