[SeaBIOS] [PATCH 04/15] Report stdvga modes in VBE via int10 (AX = 4F00h)
Kevin O'Connor
kevin at koconnor.net
Wed Sep 5 00:44:11 CEST 2012
On Tue, Sep 04, 2012 at 08:45:34AM +0200, Christian Gmeiner wrote:
> 2012/9/3 Kevin O'Connor <kevin at koconnor.net>:
> > All the modes work in the sense that one can switch to them. (I've
> > tested that.) However, I think that some modes (eg, cga) wont be
> > represented correctly by vbe_104f01.
> >
>
> Can you look at it?
Sure - see below. I don't really have a way to test this though.
-Kevin
>From 91f80cd11898a254c9b38ebb857a86c1a4beb9b0 Mon Sep 17 00:00:00 2001
From: Kevin O'Connor <kevin at koconnor.net>
Date: Tue, 4 Sep 2012 18:39:51 -0400
Subject: [PATCH] vgabios: Add support text and cga modes to vbe_104f01().
To: seabios at seabios.org
Attempt to handle cga and text modes in the vbe get_mode_info call.
Signed-off-by: Kevin O'Connor <kevin at koconnor.net>
---
vgasrc/vbe.c | 108 +++++++++++++++++++++++++++++++++++------------------------
1 file changed, 64 insertions(+), 44 deletions(-)
diff --git a/vgasrc/vbe.c b/vgasrc/vbe.c
index f44231b..d962333 100644
--- a/vgasrc/vbe.c
+++ b/vgasrc/vbe.c
@@ -82,15 +82,8 @@ vbe_104f01(struct bregs *regs)
}
memset_far(seg, info, 0, sizeof(*info));
- u16 mode_attr = VBE_MODE_ATTRIBUTE_SUPPORTED |
- VBE_MODE_ATTRIBUTE_EXTENDED_INFORMATION_AVAILABLE |
- VBE_MODE_ATTRIBUTE_COLOR_MODE |
- VBE_MODE_ATTRIBUTE_GRAPHICS_MODE |
- VBE_MODE_ATTRIBUTE_NOT_VGA_COMPATIBLE;
- u32 framebuffer = GET_GLOBAL(VBE_framebuffer);
- if (framebuffer)
- mode_attr |= VBE_MODE_ATTRIBUTE_LINEAR_FRAME_BUFFER_MODE;
- SET_FARVAR(seg, info->mode_attributes, mode_attr);
+
+ // Basic information about video controller.
u32 win_granularity = GET_GLOBAL(VBE_win_granularity);
SET_FARVAR(seg, info->winA_attributes,
(win_granularity ? VBE_WINDOW_ATTRIBUTE_RELOCATABLE : 0) |
@@ -104,6 +97,7 @@ vbe_104f01(struct bregs *regs)
extern void entry_104f05(void);
SET_FARVAR(seg, info->win_func_ptr
, SEGOFF(get_global_seg(), (u32)entry_104f05));
+ // Basic information about mode.
int width = GET_GLOBAL(vmode_g->width);
int height = GET_GLOBAL(vmode_g->height);
int linesize = DIV_ROUND_UP(width * vga_bpp(vmode_g), 8);
@@ -113,18 +107,50 @@ vbe_104f01(struct bregs *regs)
SET_FARVAR(seg, info->xcharsize, GET_GLOBAL(vmode_g->cwidth));
SET_FARVAR(seg, info->ycharsize, GET_GLOBAL(vmode_g->cheight));
int depth = GET_GLOBAL(vmode_g->depth);
- int planes = (depth == 4) ? 4 : 1;
- SET_FARVAR(seg, info->planes, planes);
SET_FARVAR(seg, info->bits_per_pixel, depth);
- SET_FARVAR(seg, info->banks, 1);
- SET_FARVAR(seg, info->mem_model, GET_GLOBAL(vmode_g->memmodel));
- SET_FARVAR(seg, info->bank_size, 0);
- u32 pages = GET_GLOBAL(VBE_total_memory) / ALIGN(height * linesize, 64*1024);
- SET_FARVAR(seg, info->pages, (pages / planes) - 1);
+ u8 memmodel = GET_GLOBAL(vmode_g->memmodel);
+ SET_FARVAR(seg, info->mem_model, memmodel);
SET_FARVAR(seg, info->reserved0, 1);
- u8 r_size, r_pos, g_size, g_pos, b_size, b_pos, a_size, a_pos;
+ // Mode specific info.
+ u16 mode_attr = VBE_MODE_ATTRIBUTE_SUPPORTED |
+ VBE_MODE_ATTRIBUTE_EXTENDED_INFORMATION_AVAILABLE |
+ VBE_MODE_ATTRIBUTE_COLOR_MODE |
+ VBE_MODE_ATTRIBUTE_GRAPHICS_MODE |
+ VBE_MODE_ATTRIBUTE_NOT_VGA_COMPATIBLE;
+ u32 framebuffer = 0;
+ int planes = 1, banks = 1;
+ u32 pages = GET_GLOBAL(VBE_total_memory) / ALIGN(height * linesize, 64*1024);
+ switch (memmodel) {
+ case MM_TEXT:
+ mode_attr &= ~VBE_MODE_ATTRIBUTE_GRAPHICS_MODE;
+ mode_attr |= VBE_MODE_ATTRIBUTE_TTY_BIOS_SUPPORT;
+ if (GET_GLOBAL(vmode_g->sstart) == SEG_MTEXT)
+ mode_attr &= ~VBE_MODE_ATTRIBUTE_COLOR_MODE;
+ pages = 1;
+ break;
+ case MM_CGA:
+ pages = 1;
+ banks = 2;
+ SET_FARVAR(seg, info->bank_size, 8);
+ break;
+ case MM_PLANAR:
+ planes = 4;
+ pages /= 4;
+ break;
+ default:
+ framebuffer = GET_GLOBAL(VBE_framebuffer);
+ if (framebuffer)
+ mode_attr |= VBE_MODE_ATTRIBUTE_LINEAR_FRAME_BUFFER_MODE;
+ break;
+ }
+ SET_FARVAR(seg, info->mode_attributes, mode_attr);
+ SET_FARVAR(seg, info->planes, planes);
+ SET_FARVAR(seg, info->pages, pages - 1);
+ SET_FARVAR(seg, info->banks, banks);
+ // Pixel color breakdown
+ u8 r_size, r_pos, g_size, g_pos, b_size, b_pos, a_size, a_pos;
switch (depth) {
case 15: r_size = 5; r_pos = 10; g_size = 5; g_pos = 5;
b_size = 5; b_pos = 0; a_size = 1; a_pos = 15; break;
@@ -133,11 +159,13 @@ vbe_104f01(struct bregs *regs)
case 24: r_size = 8; r_pos = 16; g_size = 8; g_pos = 8;
b_size = 8; b_pos = 0; a_size = 0; a_pos = 0; break;
case 32: r_size = 8; r_pos = 16; g_size = 8; g_pos = 8;
- b_size = 8; b_pos = 0; a_size = 8; a_pos = 24; break;
+ b_size = 8; b_pos = 0; a_size = 8; a_pos = 24;
+ SET_FARVAR(seg, info->directcolor_info,
+ VBE_DIRECTCOLOR_RESERVED_BITS_AVAILABLE);
+ break;
default: r_size = 0; r_pos = 0; g_size = 0; g_pos = 0;
b_size = 0; b_pos = 0; a_size = 0; a_pos = 0; break;
}
-
SET_FARVAR(seg, info->red_size, r_size);
SET_FARVAR(seg, info->red_pos, r_pos);
SET_FARVAR(seg, info->green_size, g_size);
@@ -147,31 +175,23 @@ vbe_104f01(struct bregs *regs)
SET_FARVAR(seg, info->alpha_size, a_size);
SET_FARVAR(seg, info->alpha_pos, a_pos);
- if (depth == 32)
- SET_FARVAR(seg, info->directcolor_info,
- VBE_DIRECTCOLOR_RESERVED_BITS_AVAILABLE);
- else
- SET_FARVAR(seg, info->directcolor_info, 0);
-
- if (depth > 4)
- SET_FARVAR(seg, info->phys_base, GET_GLOBAL(VBE_framebuffer));
- else
- SET_FARVAR(seg, info->phys_base, 0);
-
- SET_FARVAR(seg, info->reserved1, 0);
- SET_FARVAR(seg, info->reserved2, 0);
- SET_FARVAR(seg, info->linear_bytes_per_scanline, linesize);
- SET_FARVAR(seg, info->bank_pages, 0);
- SET_FARVAR(seg, info->linear_pages, 0);
- SET_FARVAR(seg, info->linear_red_size, r_size);
- SET_FARVAR(seg, info->linear_red_pos, r_pos);
- SET_FARVAR(seg, info->linear_green_size, g_size);
- SET_FARVAR(seg, info->linear_green_pos, g_pos);
- SET_FARVAR(seg, info->linear_blue_size, b_size);
- SET_FARVAR(seg, info->linear_blue_pos, b_pos);
- SET_FARVAR(seg, info->linear_alpha_size, a_size);
- SET_FARVAR(seg, info->linear_alpha_pos, a_pos);
- SET_FARVAR(seg, info->pixclock_max, 0);
+ // Linear framebuffer info.
+ if (framebuffer) {
+ SET_FARVAR(seg, info->phys_base, framebuffer);
+
+ SET_FARVAR(seg, info->reserved1, 0);
+ SET_FARVAR(seg, info->reserved2, 0);
+ SET_FARVAR(seg, info->linear_bytes_per_scanline, linesize);
+ SET_FARVAR(seg, info->linear_pages, 0);
+ SET_FARVAR(seg, info->linear_red_size, r_size);
+ SET_FARVAR(seg, info->linear_red_pos, r_pos);
+ SET_FARVAR(seg, info->linear_green_size, g_size);
+ SET_FARVAR(seg, info->linear_green_pos, g_pos);
+ SET_FARVAR(seg, info->linear_blue_size, b_size);
+ SET_FARVAR(seg, info->linear_blue_pos, b_pos);
+ SET_FARVAR(seg, info->linear_alpha_size, a_size);
+ SET_FARVAR(seg, info->linear_alpha_pos, a_pos);
+ }
regs->ax = 0x004f;
}
--
1.7.11.4
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