[XS] Change in coreboot[main]: drivers/qemu/bochs: Use arch-independent data port

[Matt DeVillier (Code Review)]

Matt DeVillier has submitted this change. ( https://review.coreboot.org/c/coreboot/+/82061?usp=email )

Change subject: drivers/qemu/bochs: Use arch-independent data port
......................................................................

drivers/qemu/bochs: Use arch-independent data port

The QEMU Bochs display driver uses 0x1CF as its VBE DISPI data port, but
this is only present on x86. Instead, use the port at 0x1D0 [1] which is
available on both x86 and non-x86 architectures. The data port is also
calculated inline based on the VBE DISPI index port while reading and
writing, update those expressions as well.

[1] https://web.archive.org/web/20240404032816/https://www.qemu.org/docs/master/...

Change-Id: I899beb742d42c26f3e57023f05ff459094fce5f1
Signed-off-by: Alper Nebi Yasak 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82061
Reviewed-by: David Hendricks 
Tested-by: build bot (Jenkins) 
---
M src/drivers/emulation/qemu/bochs.c
1 file changed, 3 insertions(+), 3 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  David Hendricks: Looks good to me, approved

diff --git a/src/drivers/emulation/qemu/bochs.c b/src/drivers/emulation/qemu/bochs.c
index 2e0526f..70d17cb 100644
--- a/src/drivers/emulation/qemu/bochs.c
+++ b/src/drivers/emulation/qemu/bochs.c
@@ -14,7 +14,7 @@

/* VGA init. We use the Bochs VESA VBE extensions  */
 #define VBE_DISPI_IOPORT_INDEX          0x01CE
-#define VBE_DISPI_IOPORT_DATA           0x01CF
+#define VBE_DISPI_IOPORT_DATA           0x01D0

#define VBE_DISPI_INDEX_ID              0x0
 #define VBE_DISPI_INDEX_XRES            0x1
@@ -46,7 +46,7 @@
 {
    if (res->flags & IORESOURCE_IO) {
    	outw(index, res->base);
-		outw(val, res->base + 1);
+		outw(val, res->base + 2);
    } else {
    	write16(res2mmio(res, 0x500 + index * 2, 0), val);
    }
@@ -56,7 +56,7 @@
 {
    if (res->flags & IORESOURCE_IO) {
    	outw(index, res->base);
-		return inw(res->base + 1);
+		return inw(res->base + 2);
    } else {
    	return read16(res2mmio(res, 0x500 + index * 2, 0));
    }