[Qemu-devel] [PULL 5/8] ati-vga: Fix hardware cursor image offset

[Gerd Hoffmann <kraxel@redhat.com>]

From: BALATON Zoltan <balaton@eik.bme.hu>

The crtc_offset is not needed, cur_offset is relative to the start of
vram not the start of displayed area. This fixes broken pointer image
with MacOS that uses non-0 crtc_offset.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Message-id: e6acb1fa3ca980dc948045443e5986e2aa79bf7c.1565558093.git.balaton@eik.bme.hu
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/display/ati.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/hw/display/ati.c b/hw/display/ati.c
index d372e346ffd9..ff04f7eb4a2d 100644
--- a/hw/display/ati.c
+++ b/hw/display/ati.c
@@ -132,9 +132,8 @@ static void ati_cursor_define(ATIVGAState *s)
         return; /* Do not update cursor if locked or rendered by guest */
     }
     /* FIXME handle cur_hv_offs correctly */
-    src = s->vga.vram_ptr + (s->regs.crtc_offset & 0x07ffffff) +
-          s->regs.cur_offset - (s->regs.cur_hv_offs >> 16) -
-          (s->regs.cur_hv_offs & 0xffff) * 16;
+    src = s->vga.vram_ptr + s->regs.cur_offset -
+          (s->regs.cur_hv_offs >> 16) - (s->regs.cur_hv_offs & 0xffff) * 16;
     for (i = 0; i < 64; i++) {
         for (j = 0; j < 8; j++, idx++) {
             data[idx] = src[i * 16 + j];
@@ -190,8 +189,7 @@ static void ati_cursor_draw_line(VGACommonState *vga, uint8_t *d, int scr_y)
         return;
     }
     /* FIXME handle cur_hv_offs correctly */
-    src = s->vga.vram_ptr + (s->regs.crtc_offset & 0x07ffffff) +
-          s->cursor_offset + (scr_y - vga->hw_cursor_y) * 16;
+    src = s->vga.vram_ptr + s->cursor_offset + (scr_y - vga->hw_cursor_y) * 16;
     dp = &dp[vga->hw_cursor_x];
     h = ((s->regs.crtc_h_total_disp >> 16) + 1) * 8;
     for (i = 0; i < 8; i++) {
-- 
2.18.1