[SeaBIOS] [PATCH 4/4] SeaVGABios/cbvga: Advertise compatible VESA modes
Philippe Mathieu-Daudé
f4bug at amsat.org
Fri Mar 17 20:26:00 CET 2017
Hi Patrick,
On 03/17/2017 01:49 PM, Patrick Rudolph wrote:
> Advertise compatible VESA modes, that are smaller or equal to
> coreboot's active framebuffer. Only modes that have the same Bpp
> are advertise and can be selected.
>
> Allows the Windows 7 bootloader NTLDR to show up in VESA mode.
> Allows to show the Windows 7 boot logo.
> Allows Windows to boot in safe mode and in normal boot using
> VgaSave driver with resolution up to 1600x1200.
>
> This fixes most likely other bootloader and operating systems as well,
> in case the are relying on VESA framebuffer support.
>
> Known issues:
> Windows replaces int 15h handler, resulting in memcpy_far not being available.
> The call will prematurely exit and Windows won't show any picture at all.
> All tests were done with clear screen on mode change disabled.
>
> NTLDR is aware of the framebuffer's pitch, but the internal
> clear screen method isn't. Some text artifacts might stay on screen.
> That's nothing SeaVGABios can fix.
>
> Signed-off-by: Patrick Rudolph <siro at das-labor.org>
> ---
> vgasrc/cbvga.c | 110 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 110 insertions(+)
>
> diff --git a/vgasrc/cbvga.c b/vgasrc/cbvga.c
> index 4c349c5..6be6936 100644
> --- a/vgasrc/cbvga.c
> +++ b/vgasrc/cbvga.c
> @@ -18,8 +18,73 @@ static struct vgamode_s CBmodeinfo VAR16;
> static struct vgamode_s CBemulinfo VAR16;
> static u32 CBlinelength VAR16;
>
> +static struct cbvga_mode_s
static "const" struct cbvga_mode_s
> +{
> + u16 mode;
> + struct vgamode_s info;
> +} cbvesa_modes[] VAR16 = {
> + /* VESA 1.0 modes */
> + { 0x110, { MM_DIRECT, 640, 480, 15, 8, 16, SEG_GRAPH } },
> + { 0x111, { MM_DIRECT, 640, 480, 16, 8, 16, SEG_GRAPH } },
> + { 0x112, { MM_DIRECT, 640, 480, 24, 8, 16, SEG_GRAPH } },
> + { 0x113, { MM_DIRECT, 800, 600, 15, 8, 16, SEG_GRAPH } },
> + { 0x114, { MM_DIRECT, 800, 600, 16, 8, 16, SEG_GRAPH } },
> + { 0x115, { MM_DIRECT, 800, 600, 24, 8, 16, SEG_GRAPH } },
> + { 0x116, { MM_DIRECT, 1024, 768, 15, 8, 16, SEG_GRAPH } },
> + { 0x117, { MM_DIRECT, 1024, 768, 16, 8, 16, SEG_GRAPH } },
> + { 0x118, { MM_DIRECT, 1024, 768, 24, 8, 16, SEG_GRAPH } },
> + { 0x119, { MM_DIRECT, 1280, 1024, 15, 8, 16, SEG_GRAPH } },
> + { 0x11A, { MM_DIRECT, 1280, 1024, 16, 8, 16, SEG_GRAPH } },
> + { 0x11B, { MM_DIRECT, 1280, 1024, 24, 8, 16, SEG_GRAPH } },
> + { 0x11D, { MM_DIRECT, 1600, 1200, 15, 8, 16, SEG_GRAPH } },
> + { 0x11E, { MM_DIRECT, 1600, 1200, 16, 8, 16, SEG_GRAPH } },
> + { 0x11F, { MM_DIRECT, 1600, 1200, 24, 8, 16, SEG_GRAPH } },
> + /* VESA 2.0 modes */
> + { 0x141, { MM_DIRECT, 640, 400, 32, 8, 16, SEG_GRAPH } },
> + { 0x142, { MM_DIRECT, 640, 480, 32, 8, 16, SEG_GRAPH } },
> + { 0x143, { MM_DIRECT, 800, 600, 32, 8, 16, SEG_GRAPH } },
> + { 0x144, { MM_DIRECT, 1024, 768, 32, 8, 16, SEG_GRAPH } },
> + { 0x145, { MM_DIRECT, 1280, 1024, 32, 8, 16, SEG_GRAPH } },
> + { 0x147, { MM_DIRECT, 1600, 1200, 32, 8, 16, SEG_GRAPH } },
> + { 0x149, { MM_DIRECT, 1152, 864, 15, 8, 16, SEG_GRAPH } },
> + { 0x14a, { MM_DIRECT, 1152, 864, 16, 8, 16, SEG_GRAPH } },
> + { 0x14b, { MM_DIRECT, 1152, 864, 24, 8, 16, SEG_GRAPH } },
> + { 0x14c, { MM_DIRECT, 1152, 864, 32, 8, 16, SEG_GRAPH } },
> + { 0x175, { MM_DIRECT, 1280, 768, 16, 8, 16, SEG_GRAPH } },
> + { 0x176, { MM_DIRECT, 1280, 768, 24, 8, 16, SEG_GRAPH } },
> + { 0x177, { MM_DIRECT, 1280, 768, 32, 8, 16, SEG_GRAPH } },
> + { 0x178, { MM_DIRECT, 1280, 800, 16, 8, 16, SEG_GRAPH } },
> + { 0x179, { MM_DIRECT, 1280, 800, 24, 8, 16, SEG_GRAPH } },
> + { 0x17a, { MM_DIRECT, 1280, 800, 32, 8, 16, SEG_GRAPH } },
> + { 0x17b, { MM_DIRECT, 1280, 960, 16, 8, 16, SEG_GRAPH } },
> + { 0x17c, { MM_DIRECT, 1280, 960, 24, 8, 16, SEG_GRAPH } },
> + { 0x17d, { MM_DIRECT, 1280, 960, 32, 8, 16, SEG_GRAPH } },
> + { 0x17e, { MM_DIRECT, 1440, 900, 16, 8, 16, SEG_GRAPH } },
> + { 0x17f, { MM_DIRECT, 1440, 900, 24, 8, 16, SEG_GRAPH } },
> + { 0x180, { MM_DIRECT, 1440, 900, 32, 8, 16, SEG_GRAPH } },
> + { 0x181, { MM_DIRECT, 1400, 1050, 16, 8, 16, SEG_GRAPH } },
> + { 0x182, { MM_DIRECT, 1400, 1050, 24, 8, 16, SEG_GRAPH } },
> + { 0x183, { MM_DIRECT, 1400, 1050, 32, 8, 16, SEG_GRAPH } },
> + { 0x184, { MM_DIRECT, 1680, 1050, 16, 8, 16, SEG_GRAPH } },
> + { 0x185, { MM_DIRECT, 1680, 1050, 24, 8, 16, SEG_GRAPH } },
> + { 0x186, { MM_DIRECT, 1680, 1050, 32, 8, 16, SEG_GRAPH } },
> + { 0x187, { MM_DIRECT, 1920, 1200, 16, 8, 16, SEG_GRAPH } },
> + { 0x188, { MM_DIRECT, 1920, 1200, 24, 8, 16, SEG_GRAPH } },
> + { 0x189, { MM_DIRECT, 1920, 1200, 32, 8, 16, SEG_GRAPH } },
> + { 0x18a, { MM_DIRECT, 2560, 1600, 16, 8, 16, SEG_GRAPH } },
> + { 0x18b, { MM_DIRECT, 2560, 1600, 24, 8, 16, SEG_GRAPH } },
> + { 0x18c, { MM_DIRECT, 2560, 1600, 32, 8, 16, SEG_GRAPH } },
> + { 0x18d, { MM_DIRECT, 1280, 720, 16, 8, 16, SEG_GRAPH } },
> + { 0x18e, { MM_DIRECT, 1280, 720, 24, 8, 16, SEG_GRAPH } },
> + { 0x18f, { MM_DIRECT, 1280, 720, 32, 8, 16, SEG_GRAPH } },
> + { 0x190, { MM_DIRECT, 1920, 1080, 16, 8, 16, SEG_GRAPH } },
> + { 0x191, { MM_DIRECT, 1920, 1080, 24, 8, 16, SEG_GRAPH } },
> + { 0x192, { MM_DIRECT, 1920, 1080, 32, 8, 16, SEG_GRAPH } },
> +};
> +
> struct vgamode_s *cbvga_find_mode(int mode)
> {
> + int i;
> /* Assume VGA compatible hardware in text-mode. */
> if (GET_GLOBAL(CBmode) == 0x3)
> return stdvga_find_mode(mode);
> @@ -28,16 +93,61 @@ struct vgamode_s *cbvga_find_mode(int mode)
> return &CBmodeinfo;
> if (mode == 0x03)
> return &CBemulinfo;
> +
> + /* Advertise compatible VESA VGA modes. */
> + for (i = 0; i < ARRAY_SIZE(cbvesa_modes); i++) {
> + struct cbvga_mode_s *cbmode_g = &cbvesa_modes[i];
> + /* Skip VBE modes that doesn't fit into coreboot's framebuffer */
> + if (GET_GLOBAL(cbmode_g->info.height) > GET_GLOBAL(CBmodeinfo.height))
> + continue;
> + if (GET_GLOBAL(cbmode_g->info.width) > GET_GLOBAL(CBmodeinfo.width))
> + continue;
> + if (GET_GLOBAL(cbmode_g->info.depth) != GET_GLOBAL(CBmodeinfo.depth))
> + continue;
> + if (GET_GLOBAL(cbmode_g->mode) == mode)
> + return &cbmode_g->info;
> + }
> return NULL;
> }
>
> void
> cbvga_list_modes(u16 seg, u16 *dest, u16 *last)
> {
> + int i;
> + u8 found = 0;
>
> /* Assume VGA compatible hardware in text-mode. */
> if (GET_GLOBAL(CBmode) == 0x3) {
> stdvga_list_modes(seg, dest, last);
> + } else {
> + /* Advertise additional SVGA modes for Microsoft NTLDR graphical mode.
> + * Microsoft NTLDR:
> + * * Graphical mode uses a maximum resolution of 1600x1200.
> + * * Expects to find VESA mode with 800x600 or 1024x768.
> + * * 24 Bpp and 32 Bpp are supported
> + */
> + for (i = 0; i < ARRAY_SIZE(cbvesa_modes) && dest < last; i++) {
> + struct cbvga_mode_s *cbmode_g = &cbvesa_modes[i];
> + u16 mode = GET_GLOBAL(cbmode_g->mode);
> + /* Skip VBE modes that doesn't fit into coreboot's framebuffer */
> + if (GET_GLOBAL(cbmode_g->info.height) > GET_GLOBAL(CBmodeinfo.height))
> + continue;
> + if (GET_GLOBAL(cbmode_g->info.width) > GET_GLOBAL(CBmodeinfo.width))
> + continue;
> + /* Skip VBE modes with unsupported Bpp */
> + if (GET_GLOBAL(cbmode_g->info.depth) != GET_GLOBAL(CBmodeinfo.depth))
> + continue;
> + if ((GET_GLOBAL(cbmode_g->info.height) == GET_GLOBAL(CBmodeinfo.height)) &&
> + (GET_GLOBAL(cbmode_g->info.width) == GET_GLOBAL(CBmodeinfo.width)))
> + found = 1;
> + SET_FARVAR(seg, *dest, mode);
> + dest++;
> + }
> + if ((dest < last) && !found) {
> + SET_FARVAR(seg, *dest, GET_GLOBAL(CBmode));
> + dest++;
> + }
> + SET_FARVAR(seg, *dest, 0xffff);
> }
> }
>
>
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