diff options
Diffstat (limited to 'hw/display/ati.c')
| -rw-r--r-- | hw/display/ati.c | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/hw/display/ati.c b/hw/display/ati.c index ff04f7eb4a..f24c23fa89 100644 --- a/hw/display/ati.c +++ b/hw/display/ati.c @@ -50,6 +50,7 @@ static void ati_vga_switch_mode(ATIVGAState *s) s->mode = EXT_MODE; if (s->regs.crtc_gen_cntl & CRTC2_EN) { /* CRT controller enabled, use CRTC values */ + /* FIXME Should these be the same as VGA CRTC regs? */ uint32_t offs = s->regs.crtc_offset & 0x07ffffff; int stride = (s->regs.crtc_pitch & 0x7ff) * 8; int bpp = 0; @@ -101,16 +102,23 @@ static void ati_vga_switch_mode(ATIVGAState *s) (s->regs.dac_cntl & DAC_8BIT_EN ? VBE_DISPI_8BIT_DAC : 0)); /* now set offset and stride after enable as that resets these */ if (stride) { + int bypp = DIV_ROUND_UP(bpp, BITS_PER_BYTE); + vbe_ioport_write_index(&s->vga, 0, VBE_DISPI_INDEX_VIRT_WIDTH); vbe_ioport_write_data(&s->vga, 0, stride); - if (offs % stride == 0) { - vbe_ioport_write_index(&s->vga, 0, VBE_DISPI_INDEX_Y_OFFSET); - vbe_ioport_write_data(&s->vga, 0, offs / stride); - } else { - /* FIXME what to do with this? */ - error_report("VGA offset is not multiple of pitch, " - "expect bad picture"); + stride *= bypp; + if (offs % stride) { + DPRINTF("CRTC offset is not multiple of pitch\n"); + vbe_ioport_write_index(&s->vga, 0, + VBE_DISPI_INDEX_X_OFFSET); + vbe_ioport_write_data(&s->vga, 0, offs % stride / bypp); } + vbe_ioport_write_index(&s->vga, 0, VBE_DISPI_INDEX_Y_OFFSET); + vbe_ioport_write_data(&s->vga, 0, offs / stride); + DPRINTF("VBE offset (%d,%d), vbe_start_addr=%x\n", + s->vga.vbe_regs[VBE_DISPI_INDEX_X_OFFSET], + s->vga.vbe_regs[VBE_DISPI_INDEX_Y_OFFSET], + s->vga.vbe_start_addr); } } } else { |