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cirrus: fix cirrus_invalidate_region 

off_cur_end is exclusive, so off_cur_end == cirrus_addr_mask is valid.
Fix calculation to make sure to allow that, otherwise the assert added
by commit f153b563f8 can trigger for valid
blits.

Test case: boot windows nt 4.0

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 1489579606-26020-1-git-send-email-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2017-03-15 13:06:46 +01:00
parent 827bd51726
commit e048dac616
1 changed files with 3 additions and 3 deletions
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6
hw/display/cirrus_vga.c
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@ -667,11 +667,11 @@ static void cirrus_invalidate_region(CirrusVGAState * s, int off_begin,
}
for (y = 0; y < lines; y++) {
off_cur = off_begin;
off_cur_end = (off_cur + bytesperline) & s->cirrus_addr_mask;
off_cur = off_begin;
off_cur_end = ((off_cur + bytesperline - 1) & s->cirrus_addr_mask) + 1;
assert(off_cur_end >= off_cur);
memory_region_set_dirty(&s->vga.vram, off_cur, off_cur_end - off_cur);
off_begin += off_pitch;
off_begin += off_pitch;
}
}