88 lines
2.4 KiB
Diff
88 lines
2.4 KiB
Diff
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From: Gerd Hoffmann <kraxel@redhat.com>
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Date: Tue, 19 Mar 2019 11:09:33 +0100
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Subject: vbe: add edid support.
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Git-commit: a307d0adc50f41787424a9453145293248a1908c
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VBE subfunction 0x15, read ddc data.
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Add VBE_edid where drivers can fill in a EDID data blob.
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If we find valid data there (checking the first two header
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bytes), then report the function as supported and hand out
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the data.
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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Signed-off-by: Bruce Rogers <brogers@suse.com>
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---
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vgasrc/vbe.c | 30 ++++++++++++++++++++++++++++++
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vgasrc/vgautil.h | 1 +
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2 files changed, 31 insertions(+)
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diff --git a/roms/seabios/vgasrc/vbe.c b/roms/seabios/vgasrc/vbe.c
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index 724c1bad6d7a8f612e05c198223f..66afb011ada034d53b518f8de068 100644
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--- a/roms/seabios/vgasrc/vbe.c
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+++ b/roms/seabios/vgasrc/vbe.c
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@@ -25,6 +25,7 @@ u32 VBE_total_memory VAR16 = 256 * 1024;
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u32 VBE_capabilities VAR16;
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u32 VBE_framebuffer VAR16;
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u16 VBE_win_granularity VAR16;
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+u8 VBE_edid[256] VAR16;
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static void
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vbe_104f00(struct bregs *regs)
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@@ -400,6 +401,34 @@ vbe_104f10(struct bregs *regs)
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regs->ax = 0x004f;
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}
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+static void
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+vbe_104f15(struct bregs *regs)
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+{
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+ int offset;
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+
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+ switch (regs->bl) {
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+ case 0x00:
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+ if (GET_GLOBAL(VBE_edid[0]) != 0x00 ||
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+ GET_GLOBAL(VBE_edid[1]) != 0xff)
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+ goto err;
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+ regs->bx = 0x0103;
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+ break;
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+ case 0x01:
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+ offset = regs->dx * 128;
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+ if (offset >= sizeof(VBE_edid))
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+ goto err;
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+ memcpy_far(regs->es, (void*)(regs->di+0),
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+ get_global_seg(), VBE_edid + offset,
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+ 128);
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+ break;
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+ err:
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+ default:
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+ regs->ax = 0x014f;
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+ return;
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+ }
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+ regs->ax = 0x004f;
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+}
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+
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static void
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vbe_104fXX(struct bregs *regs)
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{
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@@ -427,6 +456,7 @@ handle_104f(struct bregs *regs)
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case 0x08: vbe_104f08(regs); break;
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case 0x0a: vbe_104f0a(regs); break;
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case 0x10: vbe_104f10(regs); break;
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+ case 0x15: vbe_104f15(regs); break;
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default: vbe_104fXX(regs); break;
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}
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}
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diff --git a/roms/seabios/vgasrc/vgautil.h b/roms/seabios/vgasrc/vgautil.h
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index a9940402e45bf293f95b29bbdc2c..dd1aa189547a212ae45bae941f61 100644
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--- a/roms/seabios/vgasrc/vgautil.h
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+++ b/roms/seabios/vgasrc/vgautil.h
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@@ -89,6 +89,7 @@ extern u32 VBE_total_memory;
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extern u32 VBE_capabilities;
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extern u32 VBE_framebuffer;
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extern u16 VBE_win_granularity;
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+extern u8 VBE_edid[256];
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void handle_104f(struct bregs *regs);
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// vgafonts.c
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