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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.
device cgeight0 at obio ? csr 0x50300000 priority 4
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 {
int index; /* first element (0 origin) */
int count; /* 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 Ramdac 16 bytes 0x202000 -> P4 Regiter 4 bytes OVLBASE: 0x210000 -> Overlay Plane 1152x900x1 0x230000 -> Overlay Enable Planea 1152x900x1 0x250000 -> 24-bit Frame Buffera 1152x900x32
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Created by unroff & hp-tools. © somebody (See intro for details). All Rights Reserved. Last modified 11/5/97