CGEIGHT(4S) — DEVICES AND NETWORK INTERFACES

NAME

cgeight − 24-bit color memory frame buffer

CONFIG — SUN-3 AND SUN-4 SYSTEMS

device cgeight0 at obmem 7 csr 0xff300000 priority 4
device cgeight0 at obio 4 csr 0xfb300000 priority 4

The first synopsis line should be used to generate a kernel for the Sun-3/60; the second synopsis for a Sun-4/110 or Sun-4/150 system.

CONFIG — SUN-3x SYSTEM

device cgeight0 at obio ? csr 0x50300000 priority 4

DESCRIPTION

The cgeight is a 24-bit color memory frame buffer with a monochrome overlay plane and an overlay enable plane implemented optionally on the Sun-4/110, Sun-4/150, Sun-3/60, Sun-3/470 and Sun-3/80 system models. It provides the standard frame buffer interface as defined in fbio(4S).

In addition to the ioctls described under fbio(4S), the cgeight interface responds to two cgeight-specific colormap ioctls, FBIOPUTCMAP and FBIOGETCMAP. FBIOPUTCMAP returns no information other than success/failure using the ioctl return value. FBIOGETCMAP returns its information in the arrays pointed to by the red, green, and blue members of its fbcmap structure argument; fbcmap is defined in <sun/fbio.h> as:

struct fbcmap {
intindex;/∗ first element (0 origin) ∗/
intcount;/∗ number of elements ∗/
unsigned char∗red;/∗ red color map elements ∗/
unsigned char∗green;/∗ green color map elements ∗/
unsigned char∗blue;/∗ blue color map elements ∗/
};

The driver uses color board vertical-retrace interrupts to load the colormap.

The systems have an overlay plane colormap, which is accessed by encoding the plane group into the index value with the PIX_GROUP macro (see <pixrect/pr_planegroups.h>).

When using the mmap system call to map in the cgeight frame buffer. The device looks like:

DACBASE: 0x200000 -> Brooktree Ramdac16 bytes
0x202000 -> P4 Regiter 4 bytes
OVLBASE: 0x210000-> Overlay Plane1152x900x1
0x230000-> Overlay Enable Planea1152x900x1
0x250000-> 24-bit Frame Buffera1152x900x32

FILES

/dev/cgeight0

<sun/fbio.h>

<pixrect/pr_planegroups.h>

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