diff options
author | Gerd Hoffmann <kraxel@redhat.com> | 2016-04-26 15:24:18 +0200 |
---|---|---|
committer | Gerd Hoffmann <kraxel@redhat.com> | 2016-05-02 16:02:59 +0200 |
commit | 7fa5c2c5dc9f9bf878c1e8669eb9644d70a71e71 (patch) | |
tree | d6c4bd93dcc3cc3edf08dd0e8bbfafb510d9fb43 | |
parent | bfa0f151a564a83b5a26f3e917da98674bf3cf62 (diff) | |
download | qemu-7fa5c2c5dc9f9bf878c1e8669eb9644d70a71e71.zip qemu-7fa5c2c5dc9f9bf878c1e8669eb9644d70a71e71.tar.gz qemu-7fa5c2c5dc9f9bf878c1e8669eb9644d70a71e71.tar.bz2 |
vga: factor out vga register setup
When enabling vbe mode qemu will setup a bunch of vga registers to make
sure the vga emulation operates in correct mode for a linear
framebuffer. Move that code to a separate function so we can call it
from other places too.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
-rw-r--r-- | hw/display/vga.c | 78 |
1 files changed, 44 insertions, 34 deletions
diff --git a/hw/display/vga.c b/hw/display/vga.c index 0c1c5b5..e12f5ac 100644 --- a/hw/display/vga.c +++ b/hw/display/vga.c @@ -644,6 +644,49 @@ static void vbe_fixup_regs(VGACommonState *s) s->vbe_start_addr = offset / 4; } +/* we initialize the VGA graphic mode */ +static void vbe_update_vgaregs(VGACommonState *s) +{ + int h, shift_control; + + if (!vbe_enabled(s)) { + /* vbe is turned off -- nothing to do */ + return; + } + + /* graphic mode + memory map 1 */ + s->gr[VGA_GFX_MISC] = (s->gr[VGA_GFX_MISC] & ~0x0c) | 0x04 | + VGA_GR06_GRAPHICS_MODE; + s->cr[VGA_CRTC_MODE] |= 3; /* no CGA modes */ + s->cr[VGA_CRTC_OFFSET] = s->vbe_line_offset >> 3; + /* width */ + s->cr[VGA_CRTC_H_DISP] = + (s->vbe_regs[VBE_DISPI_INDEX_XRES] >> 3) - 1; + /* height (only meaningful if < 1024) */ + h = s->vbe_regs[VBE_DISPI_INDEX_YRES] - 1; + s->cr[VGA_CRTC_V_DISP_END] = h; + s->cr[VGA_CRTC_OVERFLOW] = (s->cr[VGA_CRTC_OVERFLOW] & ~0x42) | + ((h >> 7) & 0x02) | ((h >> 3) & 0x40); + /* line compare to 1023 */ + s->cr[VGA_CRTC_LINE_COMPARE] = 0xff; + s->cr[VGA_CRTC_OVERFLOW] |= 0x10; + s->cr[VGA_CRTC_MAX_SCAN] |= 0x40; + + if (s->vbe_regs[VBE_DISPI_INDEX_BPP] == 4) { + shift_control = 0; + s->sr[VGA_SEQ_CLOCK_MODE] &= ~8; /* no double line */ + } else { + shift_control = 2; + /* set chain 4 mode */ + s->sr[VGA_SEQ_MEMORY_MODE] |= VGA_SR04_CHN_4M; + /* activate all planes */ + s->sr[VGA_SEQ_PLANE_WRITE] |= VGA_SR02_ALL_PLANES; + } + s->gr[VGA_GFX_MODE] = (s->gr[VGA_GFX_MODE] & ~0x60) | + (shift_control << 5); + s->cr[VGA_CRTC_MAX_SCAN] &= ~0x9f; /* no double scan */ +} + static uint32_t vbe_ioport_read_index(void *opaque, uint32_t addr) { VGACommonState *s = opaque; @@ -730,52 +773,19 @@ void vbe_ioport_write_data(void *opaque, uint32_t addr, uint32_t val) case VBE_DISPI_INDEX_ENABLE: if ((val & VBE_DISPI_ENABLED) && !(s->vbe_regs[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED)) { - int h, shift_control; s->vbe_regs[VBE_DISPI_INDEX_VIRT_WIDTH] = 0; s->vbe_regs[VBE_DISPI_INDEX_X_OFFSET] = 0; s->vbe_regs[VBE_DISPI_INDEX_Y_OFFSET] = 0; s->vbe_regs[VBE_DISPI_INDEX_ENABLE] |= VBE_DISPI_ENABLED; vbe_fixup_regs(s); + vbe_update_vgaregs(s); /* clear the screen */ if (!(val & VBE_DISPI_NOCLEARMEM)) { memset(s->vram_ptr, 0, s->vbe_regs[VBE_DISPI_INDEX_YRES] * s->vbe_line_offset); } - - /* we initialize the VGA graphic mode */ - /* graphic mode + memory map 1 */ - s->gr[VGA_GFX_MISC] = (s->gr[VGA_GFX_MISC] & ~0x0c) | 0x04 | - VGA_GR06_GRAPHICS_MODE; - s->cr[VGA_CRTC_MODE] |= 3; /* no CGA modes */ - s->cr[VGA_CRTC_OFFSET] = s->vbe_line_offset >> 3; - /* width */ - s->cr[VGA_CRTC_H_DISP] = - (s->vbe_regs[VBE_DISPI_INDEX_XRES] >> 3) - 1; - /* height (only meaningful if < 1024) */ - h = s->vbe_regs[VBE_DISPI_INDEX_YRES] - 1; - s->cr[VGA_CRTC_V_DISP_END] = h; - s->cr[VGA_CRTC_OVERFLOW] = (s->cr[VGA_CRTC_OVERFLOW] & ~0x42) | - ((h >> 7) & 0x02) | ((h >> 3) & 0x40); - /* line compare to 1023 */ - s->cr[VGA_CRTC_LINE_COMPARE] = 0xff; - s->cr[VGA_CRTC_OVERFLOW] |= 0x10; - s->cr[VGA_CRTC_MAX_SCAN] |= 0x40; - - if (s->vbe_regs[VBE_DISPI_INDEX_BPP] == 4) { - shift_control = 0; - s->sr[VGA_SEQ_CLOCK_MODE] &= ~8; /* no double line */ - } else { - shift_control = 2; - /* set chain 4 mode */ - s->sr[VGA_SEQ_MEMORY_MODE] |= VGA_SR04_CHN_4M; - /* activate all planes */ - s->sr[VGA_SEQ_PLANE_WRITE] |= VGA_SR02_ALL_PLANES; - } - s->gr[VGA_GFX_MODE] = (s->gr[VGA_GFX_MODE] & ~0x60) | - (shift_control << 5); - s->cr[VGA_CRTC_MAX_SCAN] &= ~0x9f; /* no double scan */ } else { s->bank_offset = 0; } |