diff options
| author | Gerd Hoffmann <kraxel@redhat.com> | 2019-03-19 11:09:33 +0100 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2019-05-15 10:11:48 +0200 |
| commit | a307d0adc50f41787424a9453145293248a1908c (patch) | |
| tree | b7567be0fb586d231e39546b0c9a2bf56b5bf06c /vgasrc | |
| parent | 55eca9a14abef410d45c2f10ecd3f11c946064fc (diff) | |
| download | seabios-a307d0adc50f41787424a9453145293248a1908c.tar.gz | |
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>
Diffstat (limited to 'vgasrc')
| -rw-r--r-- | vgasrc/vbe.c | 30 | ||||
| -rw-r--r-- | vgasrc/vgautil.h | 1 |
2 files changed, 31 insertions, 0 deletions
diff --git a/vgasrc/vbe.c b/vgasrc/vbe.c index 724c1bad..66afb011 100644 --- a/vgasrc/vbe.c +++ b/vgasrc/vbe.c @@ -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) @@ -401,6 +402,34 @@ vbe_104f10(struct bregs *regs) } 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) { debug_stub(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; } } diff --git a/vgasrc/vgautil.h b/vgasrc/vgautil.h index a9940402..dd1aa189 100644 --- a/vgasrc/vgautil.h +++ b/vgasrc/vgautil.h @@ -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 |