I ported vesa to use the VBE service back in:
commit 55f585a15f42ffe028ff37ea1f63543795dbf56e
Author: Adam Jackson <[email protected]>
Date: Fri Sep 18 17:02:16 2009 -0400
Use VBE palette load, not VGA banging.
I'm reasonably sure that worked on all the hardware I had handy at the
time. But it doesn't work in seabios, which means 8bpp is broken under
qemu.
We query this API early in initialization, and if it fails ->savedPal
will be NULL, so use that as the hint to fall back to VGA banging.
Signed-off-by: Adam Jackson <[email protected]>
---
src/vesa.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/src/vesa.c b/src/vesa.c
index cbf6773..3f5b81c 100644
--- a/src/vesa.c
+++ b/src/vesa.c
@@ -1356,6 +1356,27 @@ VESALoadPalette(ScrnInfoPtr pScrn, int numColors, int
*indices,
int i, idx;
int base;
+ if (!pVesa->savedPal) {
+#define VESADACDelay() \
+ do { \
+ (void)inb(pVesa->ioBase + VGA_IOBASE_COLOR + VGA_IN_STAT_1_OFFSET); \
+ (void)inb(pVesa->ioBase + VGA_IOBASE_COLOR + VGA_IN_STAT_1_OFFSET); \
+ } while (0)
+
+ for (i = 0; i < numColors; i++) {
+ idx = indices[i];
+ outb(pVesa->ioBase + VGA_DAC_WRITE_ADDR, idx);
+ VESADACDelay();
+ outb(pVesa->ioBase + VGA_DAC_DATA, colors[idx].red);
+ VESADACDelay();
+ outb(pVesa->ioBase + VGA_DAC_DATA, colors[idx].green);
+ VESADACDelay();
+ outb(pVesa->ioBase + VGA_DAC_DATA, colors[idx].blue);
+ VESADACDelay();
+ }
+ return;
+ }
+
if (pVesa->pal == NULL)
pVesa->pal = calloc(1, sizeof(CARD32) * 256);
--
2.14.3
_______________________________________________
[email protected]: X.Org development
Archives: http://lists.x.org/archives/xorg-devel
Info: https://lists.x.org/mailman/listinfo/xorg-devel
