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vbe: add edid support. 

VBE subfunction 0x15, read ddc data.

Add VBE_edid where drivers can fill in a EDID data blob.
If we find valid data there (checking the first two header
bytes), then report the function as supported and hand out
the data.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2019-03-19 11:09:33 +01:00
parent 55eca9a14a
commit a307d0adc5
2 changed files with 31 additions and 0 deletions
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30
vgasrc/vbe.c
View File

@ -25,6 +25,7 @@ u32 VBE_total_memory VAR16 = 256 * 1024;
u32 VBE_capabilities VAR16;
u32 VBE_framebuffer VAR16;
u16 VBE_win_granularity VAR16;
u8 VBE_edid[256] VAR16;
static void
vbe_104f00(struct bregs *regs)
@ -400,6 +401,34 @@ vbe_104f10(struct bregs *regs)
regs->ax = 0x004f;
}
static void
vbe_104f15(struct bregs *regs)
{
int offset;
switch (regs->bl) {
case 0x00:
if (GET_GLOBAL(VBE_edid[0]) != 0x00 ||
GET_GLOBAL(VBE_edid[1]) != 0xff)
goto err;
regs->bx = 0x0103;
break;
case 0x01:
offset = regs->dx * 128;
if (offset >= sizeof(VBE_edid))
goto err;
memcpy_far(regs->es, (void*)(regs->di+0),
get_global_seg(), VBE_edid + offset,
128);
break;
err:
default:
regs->ax = 0x014f;
return;
}
regs->ax = 0x004f;
}
static void
vbe_104fXX(struct bregs *regs)
{
@ -427,6 +456,7 @@ handle_104f(struct bregs *regs)
case 0x08: vbe_104f08(regs); break;
case 0x0a: vbe_104f0a(regs); break;
case 0x10: vbe_104f10(regs); break;
case 0x15: vbe_104f15(regs); break;
default: vbe_104fXX(regs); break;
}
}

1
vgasrc/vgautil.h
View File

@ -89,6 +89,7 @@ extern u32 VBE_total_memory;
extern u32 VBE_capabilities;
extern u32 VBE_framebuffer;
extern u16 VBE_win_granularity;
extern u8 VBE_edid[256];
void handle_104f(struct bregs *regs);
// vgafonts.c