On 6/12/22 15:38, Gerd Hoffmann wrote:
Hi,
So on x86 we can have 16-bit I/O accesses unaligned to 8-bit boundary?
Yes.
So I _think_ today we should be good with removing the x86 line:
-# ifdef TARGET_I386
- { 1, 1, 2, .read = vbe_ioport_read_data, .write = vbe_ioport_write_data },
-# endif
Nope. Breaks vgabios. Testcase:
qemu-system-x86_64 -kernel /boot/vmlinuz-$(uname -r) -append vga=ask
Adding
-trace memory_region_ops_\*
I get:
memory_region_ops_write cpu 0 mr 0x13eefbf60 addr 0x1ce value 0x0 size 2
name 'vbe'
memory_region_ops_write cpu 0 mr 0x13eefbf60 addr 0x1cf value 0xb0c0
size 2 name 'vbe'
memory_region_ops_write cpu 0 mr 0x13eefbf60 addr 0x1ce value 0x0 size 2
name 'vbe'
memory_region_ops_read cpu 0 mr 0x13eefbf60 addr 0x1cf value 0xffff size
2 name 'vbe'
All graphics modes are gone.
Yeah I'll investigate, thanks for the easy test case.
